Adds most of the toolsHEADmaster

146 files changed, 15207 insertions, 0 deletions

diff --git a/v_windows/v/cmd/tools/bench/wyhash.v b/v_windows/v/cmd/tools/bench/wyhash.v
new file mode 100644
index 0000000..b760ad6
--- /dev/null
+++ b/v_windows/v/cmd/tools/bench/wyhash.v
@@ -0,0 +1,56 @@
+module main
+
+import hash.fnv1a
+import hash as wyhash
+import rand
+import benchmark
+
+fn main() {
+	rand.seed([u32(42), 0])
+	sample_size := 10000000
+	min_str_len := 20
+	max_str_len := 40
+	println('Generating $sample_size strings between $min_str_len - $max_str_len chars long...')
+	mut checksum := u64(0)
+	mut start_pos := 0
+	mut bgenerating := benchmark.start()
+	mut bytepile := []byte{}
+	for _ in 0 .. sample_size * max_str_len {
+		bytepile << byte(rand.int_in_range(40, 125))
+	}
+	mut str_lens := []int{}
+	for _ in 0 .. sample_size {
+		str_lens << rand.int_in_range(min_str_len, max_str_len)
+	}
+	bgenerating.measure('generating strings')
+	println('Hashing each of the generated strings...')
+	//
+	mut bhashing_1 := benchmark.start()
+	start_pos = 0
+	checksum = 0
+	for len in str_lens {
+		end_pos := start_pos + len
+		checksum ^= wyhash.wyhash_c(unsafe { &byte(bytepile.data) + start_pos }, u64(len),
+			1)
+		start_pos = end_pos
+	}
+	bhashing_1.measure('wyhash.wyhash_c  | checksum: ${checksum:22}')
+	mut bhashing_2 := benchmark.start()
+	start_pos = 0
+	checksum = 0
+	for len in str_lens {
+		end_pos := start_pos + len
+		checksum ^= wyhash.sum64(bytepile[start_pos..end_pos], 1)
+		start_pos = end_pos
+	}
+	bhashing_2.measure('wyhash.sum64     | checksum: ${checksum:22}')
+	mut bhashing_3 := benchmark.start()
+	start_pos = 0
+	checksum = 0
+	for len in str_lens {
+		end_pos := start_pos + len
+		checksum ^= fnv1a.sum64(bytepile[start_pos..end_pos])
+		start_pos = end_pos
+	}
+	bhashing_3.measure('fnv1a.sum64      | checksum: ${checksum:22}')
+}
diff --git a/v_windows/v/cmd/tools/check_os_api_parity.v b/v_windows/v/cmd/tools/check_os_api_parity.v
new file mode 100644
index 0000000..de6242b
--- /dev/null
+++ b/v_windows/v/cmd/tools/check_os_api_parity.v
@@ -0,0 +1,130 @@
+module main
+
+import os
+import v.util
+import v.util.diff
+import v.pref
+import v.builder
+import v.ast
+import rand
+import term
+
+const (
+	base_os      = 'linux'
+	os_names     = ['linux', 'macos', 'windows']
+	skip_modules = [
+		'builtin.bare',
+		'builtin.linux_bare.old',
+		'builtin.js',
+		'strconv',
+		'strconv.ftoa',
+		'hash',
+		'strings',
+		'crypto.rand',
+		'os.bare',
+		'os2',
+		'picohttpparser',
+		'picoev',
+		'szip',
+		'v.eval',
+	]
+)
+
+struct App {
+	diff_cmd   string
+	is_verbose bool
+	modules    []string
+mut:
+	api_differences map[string]int
+}
+
+fn main() {
+	vexe := pref.vexe_path()
+	vroot := os.dir(vexe)
+	util.set_vroot_folder(vroot)
+	os.chdir(vroot) ?
+	cmd := diff.find_working_diff_command() or { '' }
+	mut app := App{
+		diff_cmd: cmd
+		is_verbose: os.getenv('VERBOSE').len > 0
+		modules: if os.args.len > 1 { os.args[1..] } else { all_vlib_modules() }
+	}
+	for mname in app.modules {
+		if !app.is_verbose {
+			eprintln('Checking module: $mname ...')
+		}
+		api_base := app.gen_api_for_module_in_os(mname, base_os)
+		for oname in os_names {
+			if oname == base_os {
+				continue
+			}
+			api_os := app.gen_api_for_module_in_os(mname, oname)
+			app.compare_api(api_base, api_os, mname, base_os, oname)
+		}
+	}
+	howmany := app.api_differences.len
+	if howmany > 0 {
+		eprintln(term.header('Found $howmany modules with different APIs', '='))
+		for m in app.api_differences.keys() {
+			eprintln('Module: $m')
+		}
+		exit(1)
+	}
+}
+
+fn all_vlib_modules() []string {
+	mut vlib_v_files := os.walk_ext('vlib', '.v')
+	mut vmodulesmap := map[string]int{}
+	for f in vlib_v_files {
+		if f.contains('/tests/') || f.ends_with('_test.v') {
+			continue
+		}
+		vmodulename := os.dir(f).replace('/', '.').replace('vlib.', '')
+		if vmodulename in skip_modules {
+			continue
+		}
+		vmodulesmap[vmodulename] = vmodulesmap[vmodulename] + 1
+	}
+	mut modules := vmodulesmap.keys()
+	modules.sort()
+	return modules
+}
+
+fn (app App) gen_api_for_module_in_os(mod_name string, os_name string) string {
+	if app.is_verbose {
+		eprintln('Checking module: ${mod_name:-30} for OS: ${os_name:-10} ...')
+	}
+	mpath := os.join_path('vlib', mod_name.replace('.', '/'))
+	tmpname := '/tmp/${mod_name}_${os_name}.c'
+	prefs, _ := pref.parse_args([], ['-os', os_name, '-o', tmpname, '-shared', mpath])
+	mut b := builder.new_builder(prefs)
+	b.compile_c()
+	mut res := []string{}
+	for f in b.parsed_files {
+		for s in f.stmts {
+			if s is ast.FnDecl {
+				if s.is_pub {
+					fn_signature := s.stringify(b.table, mod_name, map[string]string{})
+					fn_mod := s.modname()
+					if fn_mod == mod_name {
+						fline := '$fn_mod: $fn_signature'
+						res << fline
+					}
+				}
+			}
+		}
+	}
+	res.sort()
+	return res.join('\n')
+}
+
+fn (mut app App) compare_api(api_base string, api_os string, mod_name string, os_base string, os_target string) {
+	res := diff.color_compare_strings(app.diff_cmd, rand.ulid(), api_base, api_os)
+	if res.len > 0 {
+		summary := 'Different APIs found for module: `$mod_name`, between OS base: `$os_base` and OS: `$os_target`'
+		eprintln(term.header(summary, '-'))
+		eprintln(res)
+		eprintln(term.h_divider('-'))
+		app.api_differences[mod_name] = 1
+	}
+}
diff --git a/v_windows/v/cmd/tools/fast/.gitignore b/v_windows/v/cmd/tools/fast/.gitignore
new file mode 100644
index 0000000..1efae28
--- /dev/null
+++ b/v_windows/v/cmd/tools/fast/.gitignore
@@ -0,0 +1,5 @@
+fast
+index.html
+table.html
+v.c
+v2
diff --git a/v_windows/v/cmd/tools/fast/fast.v b/v_windows/v/cmd/tools/fast/fast.v
new file mode 100644
index 0000000..3b0b282
--- /dev/null
+++ b/v_windows/v/cmd/tools/fast/fast.v
@@ -0,0 +1,200 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+import os
+import time
+
+// TODO -usecache
+const voptions = ' -skip-unused -show-timings -stats '
+
+const exe = os.executable()
+
+const fast_dir = os.dir(exe)
+
+const vdir = @VEXEROOT
+
+fn main() {
+	dump(fast_dir)
+	dump(vdir)
+	os.chdir(fast_dir) ?
+	if !os.exists('$vdir/v') && !os.is_dir('$vdir/vlib') {
+		println('fast.html generator needs to be located in `v/cmd/tools/fast`')
+	}
+	println('fast.html generator\n')
+	println('Fetching updates...')
+	ret := os.system('$vdir/v up')
+	if ret != 0 {
+		println('failed to update V')
+		return
+	}
+	// Fetch the last commit's hash
+	commit := exec('git rev-parse HEAD')[..8]
+	if !os.exists('table.html') {
+		os.create('table.html') ?
+	}
+	mut table := os.read_file('table.html') ?
+	if os.exists('website/index.html') {
+		uploaded_index := os.read_file('website/index.html') ?
+		if uploaded_index.contains('>$commit<') {
+			println('nothing to benchmark')
+			exit(1)
+			return
+		}
+	}
+	// for i, commit in commits {
+	message := exec('git log --pretty=format:"%s" -n1 $commit')
+	// println('\n${i + 1}/$commits.len Benchmarking commit $commit "$message"')
+	println('\nBenchmarking commit $commit "$message"')
+	// Build an optimized V
+	// println('Checking out ${commit}...')
+	// exec('git checkout $commit')
+	println('  Building vprod...')
+	os.chdir(vdir) ?
+	if os.args.contains('-noprod') {
+		exec('./v -o vprod cmd/v') // for faster debugging
+	} else {
+		exec('./v -o vprod -prod -prealloc cmd/v')
+	}
+	// println('cur vdir="$vdir"')
+	// cache vlib modules
+	exec('$vdir/v wipe-cache')
+	exec('$vdir/v -o v2 -prod cmd/v')
+	// measure
+	diff1 := measure('$vdir/vprod $voptions -o v.c cmd/v', 'v.c')
+	mut tcc_path := 'tcc'
+	$if freebsd {
+		tcc_path = '/usr/local/bin/tcc'
+		if vdir.contains('/tmp/cirrus-ci-build') {
+			tcc_path = 'clang'
+		}
+	}
+	if os.args.contains('-clang') {
+		tcc_path = 'clang'
+	}
+	diff2 := measure('$vdir/vprod $voptions -cc $tcc_path -o v2 cmd/v', 'v2')
+	diff3 := 0 // measure('$vdir/vprod -native $vdir/cmd/tools/1mil.v', 'native 1mil')
+	diff4 := measure('$vdir/vprod -usecache $voptions -cc clang examples/hello_world.v',
+		'hello.v')
+	vc_size := os.file_size('v.c') / 1000
+	// scan/parse/check/cgen
+	scan, parse, check, cgen, vlines := measure_steps(vdir)
+	// println('Building V took ${diff}ms')
+	commit_date := exec('git log -n1 --pretty="format:%at" $commit')
+	date := time.unix(commit_date.int())
+	//
+	os.chdir(fast_dir) ?
+	mut out := os.create('table.html') ?
+	// Place the new row on top
+	html_message := message.replace_each(['<', '&lt;', '>', '&gt;'])
+	table =
+		'<tr>
+		<td>$date.format()</td>
+		<td><a target=_blank href="https://github.com/vlang/v/commit/$commit">$commit</a></td>
+		<td>$html_message</td>
+		<td>${diff1}ms</td>
+		<td>${diff2}ms</td>
+		<td>${diff3}ms</td>
+		<td>${diff4}ms</td>
+		<td>$vc_size KB</td>
+		<td>${parse}ms</td>
+		<td>${check}ms</td>
+		<td>${cgen}ms</td>
+		<td>${scan}ms</td>
+		<td>$vlines</td>
+		<td>${int(f64(vlines) / f64(diff1) * 1000.0)}</td>
+	</tr>\n' +
+		table.trim_space()
+	out.writeln(table) ?
+	out.close()
+	// Regenerate index.html
+	header := os.read_file('header.html') ?
+	footer := os.read_file('footer.html') ?
+	mut res := os.create('index.html') ?
+	res.writeln(header) ?
+	res.writeln(table) ?
+	res.writeln(footer) ?
+	res.close()
+	//}
+	// exec('git checkout master')
+	// os.write_file('last_commit.txt', commits[commits.len - 1]) ?
+	// Upload the result to github pages
+	if os.args.contains('-upload') {
+		println('uploading...')
+		os.chdir('website') ?
+		os.execute_or_exit('git checkout gh-pages')
+		os.cp('../index.html', 'index.html') ?
+		os.rm('../index.html') ?
+		os.system('git commit -am "update benchmark"')
+		os.system('git push origin gh-pages')
+	}
+}
+
+fn exec(s string) string {
+	e := os.execute_or_exit(s)
+	return e.output.trim_right('\r\n')
+}
+
+// returns milliseconds
+fn measure(cmd string, description string) int {
+	println('  Measuring $description')
+	println('  Warming up...')
+	println(cmd)
+	for _ in 0 .. 3 {
+		exec(cmd)
+	}
+	println('  Building...')
+	mut runs := []int{}
+	for r in 0 .. 5 {
+		println('  Sample ${r + 1}/5')
+		sw := time.new_stopwatch()
+		exec(cmd)
+		runs << int(sw.elapsed().milliseconds())
+	}
+	// discard lowest and highest time
+	runs.sort()
+	runs = runs[1..4]
+	mut sum := 0
+	for run in runs {
+		sum += run
+	}
+	return int(sum / 3)
+}
+
+fn measure_steps(vdir string) (int, int, int, int, int) {
+	resp := os.execute_or_exit('$vdir/vprod $voptions -o v.c cmd/v')
+
+	mut scan, mut parse, mut check, mut cgen, mut vlines := 0, 0, 0, 0, 0
+	lines := resp.output.split_into_lines()
+	if lines.len == 3 {
+		parse = lines[0].before('.').int()
+		check = lines[1].before('.').int()
+		cgen = lines[2].before('.').int()
+	} else {
+		ms_lines := lines.map(it.split('  ms '))
+		for line in ms_lines {
+			if line.len == 2 {
+				if line[1] == 'SCAN' {
+					scan = line[0].int()
+				}
+				if line[1] == 'PARSE' {
+					parse = line[0].int()
+				}
+				if line[1] == 'CHECK' {
+					check = line[0].int()
+				}
+				if line[1] == 'C GEN' {
+					cgen = line[0].int()
+				}
+			} else {
+				// Fetch number of V lines
+				if line[0].contains('V') && line[0].contains('source') && line[0].contains('size') {
+					start := line[0].index(':') or { 0 }
+					end := line[0].index('lines,') or { 0 }
+					s := line[0][start + 1..end]
+					vlines = s.trim_space().int()
+				}
+			}
+		}
+	}
+	return scan, parse, check, cgen, vlines
+}
diff --git a/v_windows/v/cmd/tools/fast/fast_job.v b/v_windows/v/cmd/tools/fast/fast_job.v
new file mode 100644
index 0000000..e03988a
--- /dev/null
+++ b/v_windows/v/cmd/tools/fast/fast_job.v
@@ -0,0 +1,37 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+import os
+import time
+
+// A job that runs in the background, checks for repo updates,
+// runs fast.v, pushes the HTML result to the fast.vlang.io GH pages repo.
+fn main() {
+	println(time.now())
+	if !os.exists('website') {
+		println('cloning the website repo...')
+		os.system('git clone git@github.com:/vlang/website.git')
+	}
+	if !os.exists('fast') {
+		println('"fast" binary (built with `v fast.v`) was not found')
+		return
+	}
+	for {
+		res_pull := os.execute('git pull --rebase')
+		if res_pull.exit_code != 0 {
+			println('failed to git pull. uncommitted changes?')
+			return
+		}
+		// println('running ./fast')
+		resp := os.execute('./fast -upload')
+		if resp.exit_code < 0 {
+			println(resp.output)
+			return
+		}
+		if resp.exit_code != 0 {
+			println('resp != 0, skipping')
+			println(resp.output)
+		}
+		time.sleep(180 * time.second)
+	}
+}
diff --git a/v_windows/v/cmd/tools/fast/fast_main.js b/v_windows/v/cmd/tools/fast/fast_main.js
new file mode 100644
index 0000000..d6b2d19
--- /dev/null
+++ b/v_windows/v/cmd/tools/fast/fast_main.js
@@ -0,0 +1,67 @@
+const delta = 18;
+
+(function () {
+    var table = document.querySelector("table");
+    var isTbody = table.children[0].nodeName == "TBODY";
+    var trs = isTbody
+        ? table.children[0].querySelectorAll("tr")
+        : table.querySelectorAll("tr");
+    trs.forEach(function (tr, idx) {
+        if (idx != 0 && idx + 1 < trs.length) {
+            var vc = 3, vv = 4, vf = 5, vh = 6;
+            var textContent = {
+                vc: tr.children[vc].textContent,
+                vv: tr.children[vv].textContent,
+                vf: tr.children[vf].textContent,
+                vh: tr.children[vh].textContent
+            };
+            var currentData = {
+                vc: int(textContent.vc.slice(0, -2)),
+                vv: int(textContent.vv.slice(0, -2)),
+                vf: int(textContent.vf.slice(0, -2)),
+                vh: int(textContent.vh.slice(0, -2))
+            };
+            var prevData = {
+                vc: int(trs[idx + 1].children[vc].textContent.slice(0, -2)),
+                vv: int(trs[idx + 1].children[vv].textContent.slice(0, -2)),
+                vf: int(trs[idx + 1].children[vf].textContent.slice(0, -2)),
+                vh: int(trs[idx + 1].children[vh].textContent.slice(0, -2))
+            };
+            var result = {
+                vc: currentData.vc - prevData.vc,
+                vv: currentData.vv - prevData.vv,
+                vf: currentData.vf - prevData.vf,
+                vh: currentData.vh - prevData.vh
+            };
+            if (Math.abs(result.vc) > delta)
+                tr.children[vc].appendChild(createElement(result.vc));
+            if (Math.abs(result.vv) > delta * 2)
+                tr.children[vv].appendChild(createElement(result.vv));
+            if (Math.abs(result.vf) > delta * 2)
+                tr.children[vf].appendChild(createElement(result.vf));
+            if (Math.abs(result.vh) > delta * 2)
+                tr.children[vh].appendChild(createElement(result.vh));
+        }
+    });
+    function int(src) {
+        return src - 0;
+    }
+    function getClassName(x) {
+        if (x == 0)
+            return "equal";
+        return x < 0 ? "plus" : "minus";
+    }
+    function createElement(result) {
+        var el = document.createElement("span");
+        var parsedResult = parseResult(result);
+        el.classList.add("diff");
+        el.classList.add(getClassName(result));
+        el.textContent = parsedResult;
+        return el;
+    }
+    function parseResult(x) {
+        if (x == 0)
+            return "0";
+        return x > 0 ? "+" + x : x;
+    }
+})();
diff --git a/v_windows/v/cmd/tools/fast/footer.html b/v_windows/v/cmd/tools/fast/footer.html
new file mode 100644
index 0000000..37f5c0f
--- /dev/null
+++ b/v_windows/v/cmd/tools/fast/footer.html
@@ -0,0 +1,4 @@
+</table>
+<script src="main.js"></script>
+</body>
+</html>
diff --git a/v_windows/v/cmd/tools/fast/header.html b/v_windows/v/cmd/tools/fast/header.html
new file mode 100644
index 0000000..8f4ee5c
--- /dev/null
+++ b/v_windows/v/cmd/tools/fast/header.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Is V still fast?</title>
+<style>
+*, body {
+	font-family: Menlo, Monospace, 'Courier New';
+}
+table {
+	width: 1800px;
+}
+table, td {
+	border-collapse: collapse;
+	border: 1px solid #dfdfdf;
+}
+td {
+	padding: 5px;
+	position: relative;
+}
+.diff {
+	border-radius: 2.5px;
+	color: #ffffff;
+	padding: 0 5px 0 5px;
+	position: absolute;
+	right: 5px;
+}
+.minus {
+	background-color: rgb(195, 74, 104);
+}
+.plus {
+	background-color: #8BC34A;
+}
+.equal {
+	background-color: rgb(113, 68, 172);
+}
+</style>
+</head>
+<body>
+<h2>Is V still fast?</h2>
+
+Monitoring compilation speed for each commit. <br><br>
+Running on a free tier AWS t2.micro instance (1 vCPU). Typical desktop hardware is 2-3 times faster. <br><br>
+Source code: <a target=blank href='https://github.com/vlang/v/blob/master/cmd/tools/fast/fast.v'>fast.v</a> <br><br>
+
+
+
+<table>
+	<tr>
+		<td style='width:180px'>timestamp</td>
+		<td style='width:85px'>commit</td>
+		<td>commit message</td>
+		<td style='width:120px'>v -o v.c</td>
+		<td style='width:120px'>v -o v</td>
+		<td style='width:130px'>v -native 1mil.v</td>
+		<td style='width:120px'>v hello.v</td>
+		<td style='width:85px'>v.c size</td>
+		<td style='width:55px'>parse</td>
+		<td style='width:55px'>check</td>
+		<td style='width:55px'>cgen</td>
+		<td style='width:55px'>scan</td>
+		<td style='width:80px'>V lines</td>
+		<td style='width:95px'>V lines/s</td>
+	</tr>
diff --git a/v_windows/v/cmd/tools/fuzz/fuzz.sh b/v_windows/v/cmd/tools/fuzz/fuzz.sh
new file mode 100644
index 0000000..cbba7d7
--- /dev/null
+++ b/v_windows/v/cmd/tools/fuzz/fuzz.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+cores=$(nproc --all)
+
+echo Number of cores: $cores
+echo Compiling...
+./v -cc clang -o cmd/tools/fuzz/map_fuzz cmd/tools/fuzz/map_fuzz.v -prod -cflags "-fsanitize=memory"
+
+echo Fuzzing:
+while true
+do
+  for ((i=1;i<=cores;++i))
+  do
+    sleep 0.001
+    ./cmd/tools/fuzz/map_fuzz &
+  done
+  wait
+done
diff --git a/v_windows/v/cmd/tools/fuzz/map_fuzz.v b/v_windows/v/cmd/tools/fuzz/map_fuzz.v
new file mode 100644
index 0000000..f1c62f2
--- /dev/null
+++ b/v_windows/v/cmd/tools/fuzz/map_fuzz.v
@@ -0,0 +1,144 @@
+import rand
+import time
+
+fn generate_strings(str_len int, arr_len int) []string {
+	mut arr := []string{len: arr_len}
+	for i in 0 .. arr_len {
+		arr[i] = rand.string(str_len)
+	}
+	return arr
+}
+
+fn fuzz1() {
+	amount := 200000 - rand.intn(100000)
+	amount2 := 200000 - rand.intn(100000)
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	arr2 := generate_strings(len, amount2)
+	mut m := map[string]int{}
+	for i in 0 .. amount {
+		m[arr[i]] = i
+		assert i == m[arr[i]]
+	}
+	for i in 0 .. amount {
+		assert i == m[arr[i]]
+	}
+	for i in 0 .. amount2 {
+		assert 0 == m[arr2[i]]
+	}
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz2() {
+	mut m := map[string]int{}
+	amount := rand.intn(500000) + 1
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	for i, x in arr {
+		m[x] = i
+	}
+	mut i := 0
+	for key, val in m {
+		assert key == arr[i]
+		assert val == i
+		i++
+	}
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz3() {
+	mut m := map[string]int{}
+	amount := rand.intn(500000) + 1
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	for i, x in arr {
+		if (i % 10000) == 0 {
+			keys := m.keys()
+			assert keys.len == i
+			assert keys == arr[0..i]
+		}
+		m[x] = i
+	}
+	assert m.keys() == arr
+	assert m.keys().len == amount
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz4() {
+	amount := rand.intn(500000)
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	mut m := map[string]int{}
+	for i in 0 .. amount {
+		m[arr[i]] = i
+	}
+	for i in 0 .. amount {
+		m.delete(arr[i])
+		assert m[arr[i]] == 0
+	}
+	assert m.len == 0
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz5() {
+	amount := rand.intn(500000) + 1
+	arr := generate_strings(20, amount)
+	mut m := map[string]int{}
+	for i in 0 .. amount {
+		m[arr[i]] = i
+		assert (arr[i] in m) == true
+	}
+	for i in 0 .. amount {
+		m.delete(arr[i])
+		assert (arr[i] !in m) == true
+		assert m.len == amount - i - 1
+	}
+	assert m.len == 0
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn fuzz6() {
+	mut m := map[string]int{}
+	amount := rand.intn(500000) + 1
+	len := 25 - rand.intn(10)
+	arr := generate_strings(len, amount)
+	for i, x in arr {
+		m[x]++
+		m[x] += i
+		assert m[x] == i + 1
+	}
+	for i, x in arr {
+		assert m[x] == i + 1
+	}
+	unsafe {
+		m.free()
+		arr.free()
+	}
+}
+
+fn main() {
+	seed := u32(time.ticks())
+	println('seed: $seed.hex()')
+	rand.seed([seed, seed])
+	fuzz1()
+	fuzz2()
+	fuzz3()
+	fuzz4()
+	fuzz5()
+	fuzz6()
+}
diff --git a/v_windows/v/cmd/tools/gen1m.v b/v_windows/v/cmd/tools/gen1m.v
new file mode 100644
index 0000000..68b5527
--- /dev/null
+++ b/v_windows/v/cmd/tools/gen1m.v
@@ -0,0 +1,16 @@
+fn main() {
+	for i in 0 .. 100000 {
+		println('
+fn foo${i}() {
+	x := $i
+	mut a := 1 + x
+	a += 2
+	print(a)
+	a = 0
+	a = 1
+}
+')
+	}
+	// println('fn main() {foo1()} ')
+	println('fn main() { println("1m DONE") } ')
+}
diff --git a/v_windows/v/cmd/tools/gen_vc.v b/v_windows/v/cmd/tools/gen_vc.v
new file mode 100644
index 0000000..86057aa
--- /dev/null
+++ b/v_windows/v/cmd/tools/gen_vc.v
@@ -0,0 +1,370 @@
+module main
+
+import os
+import log
+import flag
+import time
+import vweb
+import net.urllib
+
+// This tool regenerates V's bootstrap .c files
+// every time the V master branch is updated.
+// if run with the --serve flag it will run in webhook
+// server mode awaiting a request to http://host:port/genhook
+// available command line flags:
+// --work-dir  gen_vc's working directory
+// --purge     force purge the local repositories
+// --serve     run in webhook server mode
+// --port      port for http server to listen on
+// --log-to    either 'file' or 'terminal'
+// --log-file  path to log file used when --log-to is 'file'
+// --dry-run   dont push anything to remote repo
+// --force     force update even if already up to date
+
+// git credentials
+const (
+	git_username = os.getenv('GITUSER')
+	git_password = os.getenv('GITPASS')
+)
+
+// repository
+const (
+	// git repo
+	git_repo_v      = 'github.com/vlang/v'
+	git_repo_vc     = 'github.com/vlang/vc'
+	// local repo directories
+	git_repo_dir_v  = 'v'
+	git_repo_dir_vc = 'vc'
+)
+
+// gen_vc
+const (
+	// name
+	app_name             = 'gen_vc'
+	// version
+	app_version          = '0.1.2'
+	// description
+	app_description      = "This tool regenerates V's bootstrap .c files every time the V master branch is updated."
+	// assume something went wrong if file size less than this
+	too_short_file_limit = 5000
+	// create a .c file for these os's
+	vc_build_oses        = [
+		'nix',
+		// all nix based os
+		'windows',
+	]
+)
+
+// default options (overridden by flags)
+const (
+	// gen_vc working directory
+	work_dir    = '/tmp/gen_vc'
+	// dont push anything to remote repo
+	dry_run     = false
+	// server port
+	server_port = 7171
+	// log file
+	log_file    = '$work_dir/log.txt'
+	// log_to is either 'file' or 'terminal'
+	log_to      = 'terminal'
+)
+
+// errors
+const (
+	err_msg_build = 'error building'
+	err_msg_make  = 'make failed'
+	err_msg_gen_c = 'failed to generate .c file'
+	err_msg_cmd_x = 'error running cmd'
+)
+
+struct GenVC {
+	// logger
+	// flag options
+	options FlagOptions
+mut:
+	logger &log.Log
+	// true if error was experienced running generate
+	gen_error bool
+}
+
+// webhook server
+struct WebhookServer {
+	vweb.Context
+mut:
+	gen_vc &GenVC = 0 // initialized in init_server
+}
+
+// storage for flag options
+struct FlagOptions {
+	work_dir string
+	purge    bool
+	serve    bool
+	port     int
+	log_to   string
+	log_file string
+	dry_run  bool
+	force    bool
+}
+
+fn main() {
+	mut fp := flag.new_flag_parser(os.args.clone())
+	fp.application(app_name)
+	fp.version(app_version)
+	fp.description(app_description)
+	fp.skip_executable()
+	show_help := fp.bool('help', 0, false, 'Show this help screen\n')
+	flag_options := parse_flags(mut fp)
+	if show_help {
+		println(fp.usage())
+		exit(0)
+	}
+	fp.finalize() or {
+		eprintln(err)
+		println(fp.usage())
+		return
+	}
+	// webhook server mode
+	if flag_options.serve {
+		vweb.run<WebhookServer>(&WebhookServer{}, flag_options.port)
+	} else {
+		// cmd mode
+		mut gen_vc := new_gen_vc(flag_options)
+		gen_vc.init()
+		gen_vc.generate()
+	}
+}
+
+// new GenVC
+fn new_gen_vc(flag_options FlagOptions) &GenVC {
+	mut logger := &log.Log{}
+	logger.set_level(.debug)
+	if flag_options.log_to == 'file' {
+		logger.set_full_logpath(flag_options.log_file)
+	}
+	return &GenVC{
+		options: flag_options
+		logger: logger
+	}
+}
+
+// WebhookServer init
+pub fn (mut ws WebhookServer) init_server() {
+	mut fp := flag.new_flag_parser(os.args.clone())
+	flag_options := parse_flags(mut fp)
+	ws.gen_vc = new_gen_vc(flag_options)
+	ws.gen_vc.init()
+	// ws.gen_vc = new_gen_vc(flag_options)
+}
+
+pub fn (mut ws WebhookServer) index() {
+	eprintln('WebhookServer.index() called')
+}
+
+// gen webhook
+pub fn (mut ws WebhookServer) genhook() {
+	// request data
+	// println(ws.vweb.req.data)
+	// TODO: parse request. json or urlencoded
+	// json.decode or net.urllib.parse
+	ws.gen_vc.generate()
+	// error in generate
+	if ws.gen_vc.gen_error {
+		ws.json('{status: "failed"}')
+		return
+	}
+	ws.json('{status: "ok"}')
+}
+
+pub fn (ws &WebhookServer) reset() {
+}
+
+// parse flags to FlagOptions struct
+fn parse_flags(mut fp flag.FlagParser) FlagOptions {
+	return FlagOptions{
+		serve: fp.bool('serve', 0, false, 'run in webhook server mode')
+		work_dir: fp.string('work-dir', 0, work_dir, 'gen_vc working directory')
+		purge: fp.bool('purge', 0, false, 'force purge the local repositories')
+		port: fp.int('port', 0, server_port, 'port for web server to listen on')
+		log_to: fp.string('log-to', 0, log_to, "log to is 'file' or 'terminal'")
+		log_file: fp.string('log-file', 0, log_file, "log file to use when log-to is 'file'")
+		dry_run: fp.bool('dry-run', 0, dry_run, 'when specified dont push anything to remote repo')
+		force: fp.bool('force', 0, false, 'force update even if already up to date')
+	}
+}
+
+fn (mut gen_vc GenVC) init() {
+	// purge repos if flag is passed
+	if gen_vc.options.purge {
+		gen_vc.purge_repos()
+	}
+}
+
+// regenerate
+fn (mut gen_vc GenVC) generate() {
+	// set errors to false
+	gen_vc.gen_error = false
+	// check if gen_vc dir exists
+	if !os.is_dir(gen_vc.options.work_dir) {
+		// try create
+		os.mkdir(gen_vc.options.work_dir) or { panic(err) }
+		// still dosen't exist... we have a problem
+		if !os.is_dir(gen_vc.options.work_dir) {
+			gen_vc.logger.error('error creating directory: $gen_vc.options.work_dir')
+			gen_vc.gen_error = true
+			return
+		}
+	}
+	// cd to gen_vc dir
+	os.chdir(gen_vc.options.work_dir) or {}
+	// if we are not running with the --serve flag (webhook server)
+	// rather than deleting and re-downloading the repo each time
+	// first check to see if the local v repo is behind master
+	// if it isn't behind theres no point continuing further
+	if !gen_vc.options.serve && os.is_dir(git_repo_dir_v) {
+		gen_vc.cmd_exec('git -C $git_repo_dir_v checkout master')
+		// fetch the remote repo just in case there are newer commits there
+		gen_vc.cmd_exec('git -C $git_repo_dir_v fetch')
+		git_status := gen_vc.cmd_exec('git -C $git_repo_dir_v status')
+		if !git_status.contains('behind') && !gen_vc.options.force {
+			gen_vc.logger.warn('v repository is already up to date.')
+			return
+		}
+	}
+	// delete repos
+	gen_vc.purge_repos()
+	// clone repos
+	gen_vc.cmd_exec('git clone --depth 1 https://$git_repo_v $git_repo_dir_v')
+	gen_vc.cmd_exec('git clone --depth 1 https://$git_repo_vc $git_repo_dir_vc')
+	// get output of git log -1 (last commit)
+	git_log_v := gen_vc.cmd_exec('git -C $git_repo_dir_v log -1 --format="commit %H%nDate: %ci%nDate Unix: %ct%nSubject: %s"')
+	git_log_vc := gen_vc.cmd_exec('git -C $git_repo_dir_vc log -1 --format="Commit %H%nDate: %ci%nDate Unix: %ct%nSubject: %s"')
+	// date of last commit in each repo
+	ts_v := git_log_v.find_between('Date:', '\n').trim_space()
+	ts_vc := git_log_vc.find_between('Date:', '\n').trim_space()
+	// parse time as string to time.Time
+	last_commit_time_v := time.parse(ts_v) or { panic(err) }
+	last_commit_time_vc := time.parse(ts_vc) or { panic(err) }
+	// git dates are in users local timezone and v time.parse does not parse
+	// timezones at the moment, so for now get unix timestamp from output also
+	t_unix_v := git_log_v.find_between('Date Unix:', '\n').trim_space().int()
+	t_unix_vc := git_log_vc.find_between('Date Unix:', '\n').trim_space().int()
+	// last commit hash in v repo
+	last_commit_hash_v := git_log_v.find_between('commit', '\n').trim_space()
+	last_commit_hash_v_short := last_commit_hash_v[..7]
+	// subject
+	last_commit_subject := git_log_v.find_between('Subject:', '\n').trim_space().replace("'",
+		'"')
+	// log some info
+	gen_vc.logger.debug('last commit time ($git_repo_v): ' + last_commit_time_v.format_ss())
+	gen_vc.logger.debug('last commit time ($git_repo_vc): ' + last_commit_time_vc.format_ss())
+	gen_vc.logger.debug('last commit hash ($git_repo_v): $last_commit_hash_v')
+	gen_vc.logger.debug('last commit subject ($git_repo_v): $last_commit_subject')
+	// if vc repo already has a newer commit than the v repo, assume it's up to date
+	if t_unix_vc >= t_unix_v && !gen_vc.options.force {
+		gen_vc.logger.warn('vc repository is already up to date.')
+		return
+	}
+	// try build v for current os (linux in this case)
+	gen_vc.cmd_exec('make -C $git_repo_dir_v')
+	v_exec := '$git_repo_dir_v/v'
+	// check if make was successful
+	gen_vc.assert_file_exists_and_is_not_too_short(v_exec, err_msg_make)
+	// build v.c for each os
+	for os_name in vc_build_oses {
+		c_file := if os_name == 'nix' { 'v.c' } else { 'v_win.c' }
+		v_flags := if os_name == 'nix' { '-os cross' } else { '-os $os_name' }
+		// try generate .c file
+		gen_vc.cmd_exec('$v_exec $v_flags -o $c_file $git_repo_dir_v/cmd/v')
+		// check if the c file seems ok
+		gen_vc.assert_file_exists_and_is_not_too_short(c_file, err_msg_gen_c)
+		// embed the latest v commit hash into the c file
+		gen_vc.cmd_exec('sed -i \'1s/^/#define V_COMMIT_HASH "$last_commit_hash_v_short"\\n/\' $c_file')
+		// move to vc repo
+		gen_vc.cmd_exec('mv $c_file $git_repo_dir_vc/$c_file')
+		// add new .c file to local vc repo
+		gen_vc.cmd_exec('git -C $git_repo_dir_vc add $c_file')
+	}
+	// check if the vc repo actually changed
+	git_status := gen_vc.cmd_exec('git -C $git_repo_dir_vc status')
+	if git_status.contains('nothing to commit') {
+		gen_vc.logger.error('no changes to vc repo: something went wrong.')
+		gen_vc.gen_error = true
+	}
+	// commit changes to local vc repo
+	gen_vc.cmd_exec_safe("git -C $git_repo_dir_vc commit -m '[v:master] $last_commit_hash_v_short - $last_commit_subject'")
+	// push changes to remote vc repo
+	gen_vc.cmd_exec_safe('git -C $git_repo_dir_vc push https://${urllib.query_escape(git_username)}:${urllib.query_escape(git_password)}@$git_repo_vc master')
+}
+
+// only execute when dry_run option is false, otherwise just log
+fn (mut gen_vc GenVC) cmd_exec_safe(cmd string) string {
+	return gen_vc.command_execute(cmd, gen_vc.options.dry_run)
+}
+
+// always execute command
+fn (mut gen_vc GenVC) cmd_exec(cmd string) string {
+	return gen_vc.command_execute(cmd, false)
+}
+
+// execute command
+fn (mut gen_vc GenVC) command_execute(cmd string, dry bool) string {
+	// if dry is true then dont execute, just log
+	if dry {
+		return gen_vc.command_execute_dry(cmd)
+	}
+	gen_vc.logger.info('cmd: $cmd')
+	r := os.execute(cmd)
+	if r.exit_code < 0 {
+		gen_vc.logger.error('$err_msg_cmd_x: "$cmd" could not start.')
+		gen_vc.logger.error(r.output)
+		// something went wrong, better start fresh next time
+		gen_vc.purge_repos()
+		gen_vc.gen_error = true
+		return ''
+	}
+	if r.exit_code != 0 {
+		gen_vc.logger.error('$err_msg_cmd_x: "$cmd" failed.')
+		gen_vc.logger.error(r.output)
+		// something went wrong, better start fresh next time
+		gen_vc.purge_repos()
+		gen_vc.gen_error = true
+		return ''
+	}
+	return r.output
+}
+
+// just log cmd, dont execute
+fn (mut gen_vc GenVC) command_execute_dry(cmd string) string {
+	gen_vc.logger.info('cmd (dry): "$cmd"')
+	return ''
+}
+
+// delete repo directories
+fn (mut gen_vc GenVC) purge_repos() {
+	// delete old repos (better to be fully explicit here, since these are destructive operations)
+	mut repo_dir := '$gen_vc.options.work_dir/$git_repo_dir_v'
+	if os.is_dir(repo_dir) {
+		gen_vc.logger.info('purging local repo: "$repo_dir"')
+		gen_vc.cmd_exec('rm -rf $repo_dir')
+	}
+	repo_dir = '$gen_vc.options.work_dir/$git_repo_dir_vc'
+	if os.is_dir(repo_dir) {
+		gen_vc.logger.info('purging local repo: "$repo_dir"')
+		gen_vc.cmd_exec('rm -rf $repo_dir')
+	}
+}
+
+// check if file size is too short
+fn (mut gen_vc GenVC) assert_file_exists_and_is_not_too_short(f string, emsg string) {
+	if !os.exists(f) {
+		gen_vc.logger.error('$err_msg_build: $emsg .')
+		gen_vc.gen_error = true
+		return
+	}
+	fsize := os.file_size(f)
+	if fsize < too_short_file_limit {
+		gen_vc.logger.error('$err_msg_build: $f exists, but is too short: only $fsize bytes.')
+		gen_vc.gen_error = true
+		return
+	}
+}
diff --git a/v_windows/v/cmd/tools/missdoc.v b/v_windows/v/cmd/tools/missdoc.v
new file mode 100644
index 0000000..188fca1
--- /dev/null
+++ b/v_windows/v/cmd/tools/missdoc.v
@@ -0,0 +1,141 @@
+// Copyright (c) 2020 Lars Pontoppidan. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+import os
+import flag
+
+const (
+	tool_name        = os.file_name(os.executable())
+	tool_version     = '0.0.2'
+	tool_description = 'Prints all V functions in .v files under PATH/, that do not yet have documentation comments.'
+)
+
+struct UndocumentedFN {
+	line      int
+	signature string
+	tags      []string
+}
+
+struct Options {
+	show_help    bool
+	collect_tags bool
+	deprecated   bool
+}
+
+fn collect(path string, mut l []string, f fn (string, mut []string)) {
+	if !os.is_dir(path) {
+		return
+	}
+	mut files := os.ls(path) or { return }
+	for file in files {
+		p := path + os.path_separator + file
+		if os.is_dir(p) && !os.is_link(p) {
+			collect(p, mut l, f)
+		} else if os.exists(p) {
+			f(p, mut l)
+		}
+	}
+	return
+}
+
+fn report_undocumented_functions_in_path(opt Options, path string) {
+	mut files := []string{}
+	collect_fn := fn (path string, mut l []string) {
+		if os.file_ext(path) == '.v' {
+			l << os.real_path(path)
+		}
+	}
+	collect(path, mut files, collect_fn)
+	for file in files {
+		if file.ends_with('_test.v') {
+			continue
+		}
+		report_undocumented_functions_in_file(opt, file)
+	}
+}
+
+fn report_undocumented_functions_in_file(opt Options, file string) {
+	contents := os.read_file(file) or { panic(err) }
+	lines := contents.split('\n')
+	mut info := []UndocumentedFN{}
+	for i, line in lines {
+		if line.starts_with('pub fn') || (line.starts_with('fn ') && !(line.starts_with('fn C.')
+			|| line.starts_with('fn main'))) {
+			// println('Match: $line')
+			if i > 0 && lines.len > 0 {
+				mut line_above := lines[i - 1]
+				if !line_above.starts_with('//') {
+					mut tags := []string{}
+					mut grab := true
+					for j := i - 1; j >= 0; j-- {
+						prev_line := lines[j]
+						if prev_line.contains('}') { // We've looked back to the above scope, stop here
+							break
+						} else if prev_line.starts_with('[') {
+							tags << collect_tags(prev_line)
+							continue
+						} else if prev_line.starts_with('//') { // Single-line comment
+							grab = false
+							break
+						}
+					}
+					if grab {
+						clean_line := line.all_before_last(' {')
+						info << UndocumentedFN{i + 1, clean_line, tags}
+					}
+				}
+			}
+		}
+	}
+	if info.len > 0 {
+		for undocumented_fn in info {
+			tags_str := if opt.collect_tags && undocumented_fn.tags.len > 0 {
+				'$undocumented_fn.tags'
+			} else {
+				''
+			}
+			if opt.deprecated {
+				println('$file:$undocumented_fn.line:0:$undocumented_fn.signature $tags_str')
+			} else {
+				if 'deprecated' !in undocumented_fn.tags {
+					println('$file:$undocumented_fn.line:0:$undocumented_fn.signature $tags_str')
+				}
+			}
+		}
+	}
+}
+
+fn collect_tags(line string) []string {
+	mut cleaned := line.all_before('/')
+	cleaned = cleaned.replace_each(['[', '', ']', '', ' ', ''])
+	return cleaned.split(',')
+}
+
+fn main() {
+	if os.args.len == 1 {
+		println('Usage: $tool_name PATH \n$tool_description\n$tool_name -h for more help...')
+		exit(1)
+	}
+	mut fp := flag.new_flag_parser(os.args[1..])
+	fp.application(tool_name)
+	fp.version(tool_version)
+	fp.description(tool_description)
+	fp.arguments_description('PATH [PATH]...')
+	// Collect tool options
+	opt := Options{
+		show_help: fp.bool('help', `h`, false, 'Show this help text.')
+		deprecated: fp.bool('deprecated', `d`, false, 'Include deprecated functions in output.')
+		collect_tags: fp.bool('tags', `t`, false, 'Also print function tags if any is found.')
+	}
+	if opt.show_help {
+		println(fp.usage())
+		exit(0)
+	}
+	for path in os.args[1..] {
+		if os.is_file(path) {
+			report_undocumented_functions_in_file(opt, path)
+		} else {
+			report_undocumented_functions_in_path(opt, path)
+		}
+	}
+}
diff --git a/v_windows/v/cmd/tools/modules/scripting/scripting.v b/v_windows/v/cmd/tools/modules/scripting/scripting.v
new file mode 100644
index 0000000..342b9b7
--- /dev/null
+++ b/v_windows/v/cmd/tools/modules/scripting/scripting.v
@@ -0,0 +1,183 @@
+module scripting
+
+import os
+import term
+import time
+
+const (
+	term_colors = term.can_show_color_on_stdout()
+)
+
+pub fn set_verbose(on bool) {
+	// setting a global here would be the obvious solution,
+	// but V does not have globals normally.
+	if on {
+		os.setenv('VERBOSE', '1', true)
+	} else {
+		os.unsetenv('VERBOSE')
+	}
+}
+
+pub fn cprint(omessage string) {
+	mut message := omessage
+	if scripting.term_colors {
+		message = term.cyan(message)
+	}
+	print(message)
+}
+
+pub fn cprint_strong(omessage string) {
+	mut message := omessage
+	if scripting.term_colors {
+		message = term.bright_green(message)
+	}
+	print(message)
+}
+
+pub fn cprintln(omessage string) {
+	cprint(omessage)
+	println('')
+}
+
+pub fn cprintln_strong(omessage string) {
+	cprint_strong(omessage)
+	println('')
+}
+
+pub fn verbose_trace(label string, message string) {
+	if os.getenv('VERBOSE').len > 0 {
+		slabel := '$time.now().format_ss_milli() $label'
+		cprintln('# ${slabel:-43s} : $message')
+	}
+}
+
+pub fn verbose_trace_strong(label string, omessage string) {
+	if os.getenv('VERBOSE').len > 0 {
+		slabel := '$time.now().format_ss_milli() $label'
+		mut message := omessage
+		if scripting.term_colors {
+			message = term.bright_green(message)
+		}
+		cprintln('# ${slabel:-43s} : $message')
+	}
+}
+
+pub fn verbose_trace_exec_result(x os.Result) {
+	if os.getenv('VERBOSE').len > 0 {
+		cprintln('#   cmd.exit_code : ${x.exit_code.str():-4s}  cmd.output:')
+		mut lnum := 1
+		lines := x.output.split_into_lines()
+		for oline in lines {
+			mut line := oline
+			if scripting.term_colors {
+				line = term.bright_green(line)
+			}
+			cprintln('# ${lnum:3d}: $line')
+			lnum++
+		}
+		cprintln('# ----------------------------------------------------------------------')
+	}
+}
+
+fn modfn(mname string, fname string) string {
+	return '${mname}.$fname'
+}
+
+pub fn chdir(path string) {
+	verbose_trace_strong(modfn(@MOD, @FN), 'cd $path')
+	os.chdir(path) or {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return
+	}
+}
+
+pub fn mkdir(path string) ? {
+	verbose_trace_strong(modfn(@MOD, @FN), 'mkdir $path')
+	os.mkdir(path) or {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return err
+	}
+}
+
+pub fn mkdir_all(path string) ? {
+	verbose_trace_strong(modfn(@MOD, @FN), 'mkdir -p $path')
+	os.mkdir_all(path) or {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return err
+	}
+}
+
+pub fn rmrf(path string) {
+	verbose_trace_strong(modfn(@MOD, @FN), 'rm -rf $path')
+	if os.exists(path) {
+		if os.is_dir(path) {
+			os.rmdir_all(path) or { panic(err) }
+		} else {
+			os.rm(path) or { panic(err) }
+		}
+	}
+}
+
+// execute a command, and return a result, or an error, if it failed in any way.
+pub fn exec(cmd string) ?os.Result {
+	verbose_trace_strong(modfn(@MOD, @FN), cmd)
+	x := os.execute(cmd)
+	if x.exit_code != 0 {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return error(x.output)
+	}
+	verbose_trace_exec_result(x)
+	return x
+}
+
+// run a command, tracing its results, and returning ONLY its output
+pub fn run(cmd string) string {
+	verbose_trace_strong(modfn(@MOD, @FN), cmd)
+	x := os.execute(cmd)
+	if x.exit_code < 0 {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return ''
+	}
+	verbose_trace_exec_result(x)
+	if x.exit_code == 0 {
+		return x.output.trim_right('\r\n')
+	}
+	return ''
+}
+
+pub fn exit_0_status(cmd string) bool {
+	verbose_trace_strong(modfn(@MOD, @FN), cmd)
+	x := os.execute(cmd)
+	if x.exit_code < 0 {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return false
+	}
+	verbose_trace_exec_result(x)
+	if x.exit_code == 0 {
+		return true
+	}
+	return false
+}
+
+pub fn tool_must_exist(toolcmd string) {
+	verbose_trace(modfn(@MOD, @FN), toolcmd)
+	if exit_0_status('type $toolcmd') {
+		return
+	}
+	eprintln('Missing tool: $toolcmd')
+	eprintln('Please try again after you install it.')
+	exit(1)
+}
+
+pub fn used_tools_must_exist(tools []string) {
+	for t in tools {
+		tool_must_exist(t)
+	}
+}
+
+pub fn show_sizes_of_files(files []string) {
+	for f in files {
+		size := os.file_size(f)
+		println('$size $f') // println('${size:10d} $f')
+	}
+}
diff --git a/v_windows/v/cmd/tools/modules/testing/common.v b/v_windows/v/cmd/tools/modules/testing/common.v
new file mode 100644
index 0000000..7f9de79
--- /dev/null
+++ b/v_windows/v/cmd/tools/modules/testing/common.v
@@ -0,0 +1,488 @@
+module testing
+
+import os
+import time
+import term
+import benchmark
+import sync.pool
+import v.pref
+import v.util.vtest
+
+const github_job = os.getenv('GITHUB_JOB')
+
+const show_start = os.getenv('VTEST_SHOW_START') == '1'
+
+const hide_skips = os.getenv('VTEST_HIDE_SKIP') == '1'
+
+const hide_oks = os.getenv('VTEST_HIDE_OK') == '1'
+
+pub struct TestSession {
+pub mut:
+	files         []string
+	skip_files    []string
+	vexe          string
+	vroot         string
+	vtmp_dir      string
+	vargs         string
+	failed        bool
+	benchmark     benchmark.Benchmark
+	rm_binaries   bool = true
+	silent_mode   bool
+	progress_mode bool
+	root_relative bool // used by CI runs, so that the output is stable everywhere
+	nmessages     chan LogMessage // many publishers, single consumer/printer
+	nmessage_idx  int      // currently printed message index
+	nprint_ended  chan int // read to block till printing ends, 1:1
+	failed_cmds   shared []string
+}
+
+enum MessageKind {
+	ok
+	fail
+	skip
+	info
+	sentinel
+}
+
+struct LogMessage {
+	message string
+	kind    MessageKind
+}
+
+pub fn (mut ts TestSession) add_failed_cmd(cmd string) {
+	lock ts.failed_cmds {
+		ts.failed_cmds << cmd
+	}
+}
+
+pub fn (mut ts TestSession) show_list_of_failed_tests() {
+	for i, cmd in ts.failed_cmds {
+		eprintln(term.failed('Failed command ${i + 1}:') + '    $cmd')
+	}
+}
+
+pub fn (mut ts TestSession) append_message(kind MessageKind, msg string) {
+	ts.nmessages <- LogMessage{
+		message: msg
+		kind: kind
+	}
+}
+
+pub fn (mut ts TestSession) print_messages() {
+	empty := term.header(' ', ' ')
+	mut print_msg_time := time.new_stopwatch()
+	for {
+		// get a message from the channel of messages to be printed:
+		mut rmessage := <-ts.nmessages
+		if rmessage.kind == .sentinel {
+			// a sentinel for stopping the printing thread
+			if !ts.silent_mode && ts.progress_mode {
+				eprintln('')
+			}
+			ts.nprint_ended <- 0
+			return
+		}
+		if rmessage.kind != .info {
+			ts.nmessage_idx++
+		}
+		msg := rmessage.message.replace_each([
+			'TMP1',
+			'${ts.nmessage_idx:1d}',
+			'TMP2',
+			'${ts.nmessage_idx:2d}',
+			'TMP3',
+			'${ts.nmessage_idx:3d}',
+			'TMP4',
+			'${ts.nmessage_idx:4d}',
+		])
+		is_ok := rmessage.kind == .ok
+		//
+		time_passed := print_msg_time.elapsed().seconds()
+		if time_passed > 10 && ts.silent_mode && is_ok {
+			// Even if OK tests are suppressed,
+			// show *at least* 1 result every 10 seconds,
+			// otherwise the CI can seem stuck ...
+			eprintln(msg)
+			print_msg_time.restart()
+			continue
+		}
+		if ts.progress_mode {
+			// progress mode, the last line is rewritten many times:
+			if is_ok && !ts.silent_mode {
+				print('\r$empty\r$msg')
+			} else {
+				// the last \n is needed, so SKIP/FAIL messages
+				// will not get overwritten by the OK ones
+				eprint('\r$empty\r$msg\n')
+			}
+			continue
+		}
+		if !ts.silent_mode || !is_ok {
+			// normal expanded mode, or failures in -silent mode
+			eprintln(msg)
+			continue
+		}
+	}
+}
+
+pub fn new_test_session(_vargs string, will_compile bool) TestSession {
+	mut skip_files := []string{}
+	if will_compile {
+		$if msvc {
+			skip_files << 'vlib/v/tests/const_comptime_eval_before_vinit_test.v' // _constructor used
+		}
+		$if solaris {
+			skip_files << 'examples/gg/gg2.v'
+			skip_files << 'examples/pico/pico.v'
+			skip_files << 'examples/sokol/fonts.v'
+			skip_files << 'examples/sokol/drawing.v'
+		}
+		$if macos {
+			skip_files << 'examples/database/mysql.v'
+			skip_files << 'examples/database/orm.v'
+			skip_files << 'examples/database/psql/customer.v'
+		}
+		$if windows {
+			skip_files << 'examples/database/mysql.v'
+			skip_files << 'examples/database/orm.v'
+			skip_files << 'examples/websocket/ping.v' // requires OpenSSL
+			skip_files << 'examples/websocket/client-server/client.v' // requires OpenSSL
+			skip_files << 'examples/websocket/client-server/server.v' // requires OpenSSL
+			$if tinyc {
+				skip_files << 'examples/database/orm.v' // try fix it
+			}
+		}
+		if testing.github_job != 'sokol-shaders-can-be-compiled' {
+			// These examples need .h files that are produced from the supplied .glsl files,
+			// using by the shader compiler tools in https://github.com/floooh/sokol-tools-bin/archive/pre-feb2021-api-changes.tar.gz
+			skip_files << 'examples/sokol/02_cubes_glsl/cube_glsl.v'
+			skip_files << 'examples/sokol/03_march_tracing_glsl/rt_glsl.v'
+			skip_files << 'examples/sokol/04_multi_shader_glsl/rt_glsl.v'
+			skip_files << 'examples/sokol/05_instancing_glsl/rt_glsl.v'
+			// Skip obj_viewer code in the CI
+			skip_files << 'examples/sokol/06_obj_viewer/show_obj.v'
+		}
+		if testing.github_job != 'ubuntu-tcc' {
+			skip_files << 'examples/c_interop_wkhtmltopdf.v' // needs installation of wkhtmltopdf from https://github.com/wkhtmltopdf/packaging/releases
+			// the ttf_test.v is not interactive, but needs X11 headers to be installed, which is done only on ubuntu-tcc for now
+			skip_files << 'vlib/x/ttf/ttf_test.v'
+			skip_files << 'vlib/vweb/vweb_app_test.v' // imports the `sqlite` module, which in turn includes sqlite3.h
+		}
+		if testing.github_job != 'audio-examples' {
+			skip_files << 'examples/sokol/sounds/melody.v'
+			skip_files << 'examples/sokol/sounds/wav_player.v'
+			skip_files << 'examples/sokol/sounds/simple_sin_tones.v'
+		}
+	}
+	vargs := _vargs.replace('-progress', '').replace('-progress', '')
+	vexe := pref.vexe_path()
+	vroot := os.dir(vexe)
+	new_vtmp_dir := setup_new_vtmp_folder()
+	if term.can_show_color_on_stderr() {
+		os.setenv('VCOLORS', 'always', true)
+	}
+	return TestSession{
+		vexe: vexe
+		vroot: vroot
+		skip_files: skip_files
+		vargs: vargs
+		vtmp_dir: new_vtmp_dir
+		silent_mode: _vargs.contains('-silent')
+		progress_mode: _vargs.contains('-progress')
+	}
+}
+
+pub fn (mut ts TestSession) init() {
+	ts.files.sort()
+	ts.benchmark = benchmark.new_benchmark_no_cstep()
+}
+
+pub fn (mut ts TestSession) add(file string) {
+	ts.files << file
+}
+
+pub fn (mut ts TestSession) test() {
+	// Ensure that .tmp.c files generated from compiling _test.v files,
+	// are easy to delete at the end, *without* affecting the existing ones.
+	current_wd := os.getwd()
+	if current_wd == os.wd_at_startup && current_wd == ts.vroot {
+		ts.root_relative = true
+	}
+	//
+	ts.init()
+	mut remaining_files := []string{}
+	for dot_relative_file in ts.files {
+		relative_file := dot_relative_file.replace('./', '')
+		file := os.real_path(relative_file)
+		$if windows {
+			if file.contains('sqlite') || file.contains('httpbin') {
+				continue
+			}
+		}
+		$if !macos {
+			if file.contains('customer') {
+				continue
+			}
+		}
+		$if msvc {
+			if file.contains('asm') {
+				continue
+			}
+		}
+		remaining_files << dot_relative_file
+	}
+	remaining_files = vtest.filter_vtest_only(remaining_files, fix_slashes: false)
+	ts.files = remaining_files
+	ts.benchmark.set_total_expected_steps(remaining_files.len)
+	mut pool_of_test_runners := pool.new_pool_processor(callback: worker_trunner)
+	// for handling messages across threads
+	ts.nmessages = chan LogMessage{cap: 10000}
+	ts.nprint_ended = chan int{cap: 0}
+	ts.nmessage_idx = 0
+	go ts.print_messages()
+	pool_of_test_runners.set_shared_context(ts)
+	pool_of_test_runners.work_on_pointers(unsafe { remaining_files.pointers() })
+	ts.benchmark.stop()
+	ts.append_message(.sentinel, '') // send the sentinel
+	_ := <-ts.nprint_ended // wait for the stop of the printing thread
+	eprintln(term.h_divider('-'))
+	// cleanup generated .tmp.c files after successfull tests:
+	if ts.benchmark.nfail == 0 {
+		if ts.rm_binaries {
+			os.rmdir_all(ts.vtmp_dir) or { panic(err) }
+		}
+	}
+	ts.show_list_of_failed_tests()
+}
+
+fn worker_trunner(mut p pool.PoolProcessor, idx int, thread_id int) voidptr {
+	mut ts := &TestSession(p.get_shared_context())
+	tmpd := ts.vtmp_dir
+	show_stats := '-stats' in ts.vargs.split(' ')
+	// tls_bench is used to format the step messages/timings
+	mut tls_bench := &benchmark.Benchmark(p.get_thread_context(idx))
+	if isnil(tls_bench) {
+		tls_bench = benchmark.new_benchmark_pointer()
+		tls_bench.set_total_expected_steps(ts.benchmark.nexpected_steps)
+		p.set_thread_context(idx, tls_bench)
+	}
+	tls_bench.no_cstep = true
+	dot_relative_file := p.get_item<string>(idx)
+	mut relative_file := dot_relative_file.replace('./', '')
+	mut cmd_options := [ts.vargs]
+	if relative_file.contains('global') && !ts.vargs.contains('fmt') {
+		cmd_options << ' -enable-globals'
+	}
+	if ts.root_relative {
+		relative_file = relative_file.replace(ts.vroot + os.path_separator, '')
+	}
+	file := os.real_path(relative_file)
+	normalised_relative_file := relative_file.replace('\\', '/')
+	// Ensure that the generated binaries will be stored in the temporary folder.
+	// Remove them after a test passes/fails.
+	fname := os.file_name(file)
+	generated_binary_fname := if os.user_os() == 'windows' {
+		fname.replace('.v', '.exe')
+	} else {
+		fname.replace('.v', '')
+	}
+	generated_binary_fpath := os.join_path(tmpd, generated_binary_fname)
+	if os.exists(generated_binary_fpath) {
+		if ts.rm_binaries {
+			os.rm(generated_binary_fpath) or { panic(err) }
+		}
+	}
+	if !ts.vargs.contains('fmt') {
+		cmd_options << ' -o "$generated_binary_fpath"'
+	}
+	cmd := '"$ts.vexe" ' + cmd_options.join(' ') + ' "$file"'
+	ts.benchmark.step()
+	tls_bench.step()
+	if relative_file.replace('\\', '/') in ts.skip_files {
+		ts.benchmark.skip()
+		tls_bench.skip()
+		if !testing.hide_skips {
+			ts.append_message(.skip, tls_bench.step_message_skip(normalised_relative_file))
+		}
+		return pool.no_result
+	}
+	if show_stats {
+		ts.append_message(.ok, term.h_divider('-'))
+		status := os.system(cmd)
+		if status == 0 {
+			ts.benchmark.ok()
+			tls_bench.ok()
+		} else {
+			ts.failed = true
+			ts.benchmark.fail()
+			tls_bench.fail()
+			ts.add_failed_cmd(cmd)
+			return pool.no_result
+		}
+	} else {
+		if testing.show_start {
+			ts.append_message(.info, '                 starting $relative_file ...')
+		}
+		r := os.execute(cmd)
+		if r.exit_code < 0 {
+			ts.failed = true
+			ts.benchmark.fail()
+			tls_bench.fail()
+			ts.append_message(.fail, tls_bench.step_message_fail(normalised_relative_file))
+			ts.add_failed_cmd(cmd)
+			return pool.no_result
+		}
+		if r.exit_code != 0 {
+			ts.failed = true
+			ts.benchmark.fail()
+			tls_bench.fail()
+			ending_newline := if r.output.ends_with('\n') { '\n' } else { '' }
+			ts.append_message(.fail, tls_bench.step_message_fail('$normalised_relative_file\n$r.output.trim_space()$ending_newline'))
+			ts.add_failed_cmd(cmd)
+		} else {
+			ts.benchmark.ok()
+			tls_bench.ok()
+			if !testing.hide_oks {
+				ts.append_message(.ok, tls_bench.step_message_ok(normalised_relative_file))
+			}
+		}
+	}
+	if os.exists(generated_binary_fpath) {
+		if ts.rm_binaries {
+			os.rm(generated_binary_fpath) or { panic(err) }
+		}
+	}
+	return pool.no_result
+}
+
+pub fn vlib_should_be_present(parent_dir string) {
+	vlib_dir := os.join_path(parent_dir, 'vlib')
+	if !os.is_dir(vlib_dir) {
+		eprintln('$vlib_dir is missing, it must be next to the V executable')
+		exit(1)
+	}
+}
+
+pub fn v_build_failing(zargs string, folder string) bool {
+	return v_build_failing_skipped(zargs, folder, [])
+}
+
+pub fn prepare_test_session(zargs string, folder string, oskipped []string, main_label string) TestSession {
+	vexe := pref.vexe_path()
+	parent_dir := os.dir(vexe)
+	vlib_should_be_present(parent_dir)
+	vargs := zargs.replace(vexe, '')
+	eheader(main_label)
+	if vargs.len > 0 {
+		eprintln('v compiler args: "$vargs"')
+	}
+	mut session := new_test_session(vargs, true)
+	files := os.walk_ext(os.join_path(parent_dir, folder), '.v')
+	mut mains := []string{}
+	mut skipped := oskipped.clone()
+	next_file: for f in files {
+		fnormalised := f.replace('\\', '/')
+		// NB: a `testdata` folder, is the preferred name of a folder, containing V code,
+		// that you *do not want* the test framework to find incidentally for various reasons,
+		// for example module import tests, or subtests, that are compiled/run by other parent tests
+		// in specific configurations, etc.
+		if fnormalised.contains('testdata/') || fnormalised.contains('modules/')
+			|| f.contains('preludes/') {
+			continue
+		}
+		$if windows {
+			// skip pico and process/command examples on windows
+			if fnormalised.ends_with('examples/pico/pico.v')
+				|| fnormalised.ends_with('examples/process/command.v') {
+				continue
+			}
+		}
+		c := os.read_file(f) or { panic(err) }
+		maxc := if c.len > 300 { 300 } else { c.len }
+		start := c[0..maxc]
+		if start.contains('module ') && !start.contains('module main') {
+			skipped_f := f.replace(os.join_path(parent_dir, ''), '')
+			skipped << skipped_f
+		}
+		for skip_prefix in oskipped {
+			if f.starts_with(skip_prefix) {
+				continue next_file
+			}
+		}
+		mains << f
+	}
+	session.files << mains
+	session.skip_files << skipped
+	return session
+}
+
+pub fn v_build_failing_skipped(zargs string, folder string, oskipped []string) bool {
+	main_label := 'Building $folder ...'
+	finish_label := 'building $folder'
+	mut session := prepare_test_session(zargs, folder, oskipped, main_label)
+	session.test()
+	eprintln(session.benchmark.total_message(finish_label))
+	return session.failed
+}
+
+pub fn build_v_cmd_failed(cmd string) bool {
+	res := os.execute(cmd)
+	if res.exit_code < 0 {
+		return true
+	}
+	if res.exit_code != 0 {
+		eprintln('')
+		eprintln(res.output)
+		return true
+	}
+	return false
+}
+
+pub fn building_any_v_binaries_failed() bool {
+	eheader('Building V binaries...')
+	eprintln('VFLAGS is: "' + os.getenv('VFLAGS') + '"')
+	vexe := pref.vexe_path()
+	parent_dir := os.dir(vexe)
+	vlib_should_be_present(parent_dir)
+	os.chdir(parent_dir) or { panic(err) }
+	mut failed := false
+	v_build_commands := ['$vexe -o v_g             -g  cmd/v', '$vexe -o v_prod_g  -prod -g  cmd/v',
+		'$vexe -o v_cg            -cg cmd/v', '$vexe -o v_prod_cg -prod -cg cmd/v',
+		'$vexe -o v_prod    -prod     cmd/v',
+	]
+	mut bmark := benchmark.new_benchmark()
+	for cmd in v_build_commands {
+		bmark.step()
+		if build_v_cmd_failed(cmd) {
+			bmark.fail()
+			failed = true
+			eprintln(bmark.step_message_fail('command: $cmd . See details above ^^^^^^^'))
+			eprintln('')
+			continue
+		}
+		bmark.ok()
+		if !testing.hide_oks {
+			eprintln(bmark.step_message_ok('command: $cmd'))
+		}
+	}
+	bmark.stop()
+	eprintln(term.h_divider('-'))
+	eprintln(bmark.total_message('building v binaries'))
+	return failed
+}
+
+pub fn eheader(msg string) {
+	eprintln(term.header_left(msg, '-'))
+}
+
+pub fn header(msg string) {
+	println(term.header_left(msg, '-'))
+}
+
+pub fn setup_new_vtmp_folder() string {
+	now := time.sys_mono_now()
+	new_vtmp_dir := os.join_path(os.temp_dir(), 'v', 'test_session_$now')
+	os.mkdir_all(new_vtmp_dir) or { panic(err) }
+	os.setenv('VTMP', new_vtmp_dir, true)
+	return new_vtmp_dir
+}
diff --git a/v_windows/v/cmd/tools/modules/vgit/vgit.v b/v_windows/v/cmd/tools/modules/vgit/vgit.v
new file mode 100644
index 0000000..efa2e8a
--- /dev/null
+++ b/v_windows/v/cmd/tools/modules/vgit/vgit.v
@@ -0,0 +1,197 @@
+module vgit
+
+import os
+import flag
+import scripting
+
+pub fn check_v_commit_timestamp_before_self_rebuilding(v_timestamp int) {
+	if v_timestamp >= 1561805697 {
+		return
+	}
+	eprintln('##################################################################')
+	eprintln('# WARNING: v self rebuilding, before 5b7a1e8 (2019-06-29 12:21)  #')
+	eprintln('#          required the v executable to be built *inside*        #')
+	eprintln('#          the toplevel compiler/ folder.                        #')
+	eprintln('#                                                                #')
+	eprintln('#          That is not supported by this tool.                   #')
+	eprintln('#          You will have to build it manually there.             #')
+	eprintln('##################################################################')
+}
+
+pub fn validate_commit_exists(commit string) {
+	if commit.len == 0 {
+		return
+	}
+	cmd := "git cat-file -t '$commit' "
+	if !scripting.exit_0_status(cmd) {
+		eprintln('Commit: "$commit" does not exist in the current repository.')
+		exit(3)
+	}
+}
+
+pub fn line_to_timestamp_and_commit(line string) (int, string) {
+	parts := line.split(' ')
+	return parts[0].int(), parts[1]
+}
+
+pub fn normalized_workpath_for_commit(workdir string, commit string) string {
+	nc := 'v_at_' + commit.replace('^', '_').replace('-', '_').replace('/', '_')
+	return os.real_path(workdir + os.path_separator + nc)
+}
+
+fn get_current_folder_commit_hash() string {
+	vline := scripting.run('git rev-list -n1 --timestamp HEAD')
+	_, v_commithash := line_to_timestamp_and_commit(vline)
+	return v_commithash
+}
+
+pub fn prepare_vc_source(vcdir string, cdir string, commit string) (string, string) {
+	scripting.chdir(cdir)
+	// Building a historic v with the latest vc is not always possible ...
+	// It is more likely, that the vc *at the time of the v commit*,
+	// or slightly before that time will be able to build the historic v:
+	vline := scripting.run('git rev-list -n1 --timestamp "$commit" ')
+	v_timestamp, v_commithash := line_to_timestamp_and_commit(vline)
+	scripting.verbose_trace(@FN, 'v_timestamp: $v_timestamp | v_commithash: $v_commithash')
+	check_v_commit_timestamp_before_self_rebuilding(v_timestamp)
+	scripting.chdir(vcdir)
+	scripting.run('git checkout --quiet master')
+	//
+	mut vccommit := ''
+	vcbefore_subject_match := scripting.run('git rev-list HEAD -n1 --timestamp --grep=${v_commithash[0..7]} ')
+	scripting.verbose_trace(@FN, 'vcbefore_subject_match: $vcbefore_subject_match')
+	if vcbefore_subject_match.len > 3 {
+		_, vccommit = line_to_timestamp_and_commit(vcbefore_subject_match)
+	} else {
+		scripting.verbose_trace(@FN, 'the v commit did not match anything in the vc log; try --timestamp instead.')
+		vcbefore := scripting.run('git rev-list HEAD -n1 --timestamp --before=$v_timestamp ')
+		_, vccommit = line_to_timestamp_and_commit(vcbefore)
+	}
+	scripting.verbose_trace(@FN, 'vccommit: $vccommit')
+	scripting.run('git checkout --quiet "$vccommit" ')
+	scripting.run('wc *.c')
+	scripting.chdir(cdir)
+	return v_commithash, vccommit
+}
+
+pub fn clone_or_pull(remote_git_url string, local_worktree_path string) {
+	// NB: after clone_or_pull, the current repo branch is === HEAD === master
+	if os.is_dir(local_worktree_path) && os.is_dir(os.join_path(local_worktree_path, '.git')) {
+		// Already existing ... Just pulling in this case is faster usually.
+		scripting.run('git -C "$local_worktree_path"  checkout --quiet master')
+		scripting.run('git -C "$local_worktree_path"  pull     --quiet ')
+	} else {
+		// Clone a fresh
+		scripting.run('git clone --quiet "$remote_git_url"  "$local_worktree_path" ')
+	}
+}
+
+pub struct VGitContext {
+pub:
+	cc          string = 'cc' // what compiler to use
+	workdir     string = '/tmp' // the base working folder
+	commit_v    string = 'master' // the commit-ish that needs to be prepared
+	path_v      string // where is the local working copy v repo
+	path_vc     string // where is the local working copy vc repo
+	v_repo_url  string // the remote v repo URL
+	vc_repo_url string // the remote vc repo URL
+pub mut:
+	// these will be filled by vgitcontext.compile_oldv_if_needed()
+	commit_v__hash string // the git commit of the v repo that should be prepared
+	commit_vc_hash string // the git commit of the vc repo, corresponding to commit_v__hash
+	vexename       string // v or v.exe
+	vexepath       string // the full absolute path to the prepared v/v.exe
+	vvlocation     string // v.v or compiler/ or cmd/v, depending on v version
+	make_fresh_tcc bool   // whether to do 'make fresh_tcc' before compiling an old V.
+}
+
+pub fn (mut vgit_context VGitContext) compile_oldv_if_needed() {
+	vgit_context.vexename = if os.user_os() == 'windows' { 'v.exe' } else { 'v' }
+	vgit_context.vexepath = os.real_path(os.join_path(vgit_context.path_v, vgit_context.vexename))
+	mut command_for_building_v_from_c_source := ''
+	mut command_for_selfbuilding := ''
+	if 'windows' == os.user_os() {
+		command_for_building_v_from_c_source = '$vgit_context.cc -std=c99 -municode -w -o cv.exe  "$vgit_context.path_vc/v_win.c" '
+		command_for_selfbuilding = './cv.exe -o $vgit_context.vexename {SOURCE}'
+	} else {
+		command_for_building_v_from_c_source = '$vgit_context.cc -std=gnu11 -w -o cv "$vgit_context.path_vc/v.c"  -lm -lpthread'
+		command_for_selfbuilding = './cv -o $vgit_context.vexename {SOURCE}'
+	}
+	scripting.chdir(vgit_context.workdir)
+	clone_or_pull(vgit_context.v_repo_url, vgit_context.path_v)
+	clone_or_pull(vgit_context.vc_repo_url, vgit_context.path_vc)
+	scripting.chdir(vgit_context.path_v)
+	scripting.run('git checkout --quiet $vgit_context.commit_v')
+	if os.is_dir(vgit_context.path_v) && os.exists(vgit_context.vexepath) {
+		// already compiled, so no need to compile v again
+		vgit_context.commit_v__hash = get_current_folder_commit_hash()
+		return
+	}
+	v_commithash, vccommit_before := prepare_vc_source(vgit_context.path_vc, vgit_context.path_v,
+		'HEAD')
+	vgit_context.commit_v__hash = v_commithash
+	vgit_context.commit_vc_hash = vccommit_before
+	if os.exists('cmd/v') {
+		vgit_context.vvlocation = 'cmd/v'
+	} else {
+		vgit_context.vvlocation = if os.exists('v.v') { 'v.v' } else { 'compiler' }
+	}
+	if os.is_dir(vgit_context.path_v) && os.exists(vgit_context.vexepath) {
+		// already compiled, so no need to compile v again
+		return
+	}
+	// Recompilation is needed. Just to be sure, clean up everything first.
+	scripting.run('git clean -xf')
+	if vgit_context.make_fresh_tcc {
+		scripting.run('make fresh_tcc')
+	}
+	scripting.run(command_for_building_v_from_c_source)
+	build_cmd := command_for_selfbuilding.replace('{SOURCE}', vgit_context.vvlocation)
+	scripting.run(build_cmd)
+	// At this point, there exists a file vgit_context.vexepath
+	// which should be a valid working V executable.
+}
+
+pub struct VGitOptions {
+pub mut:
+	workdir     string // the working folder (typically /tmp), where the tool will write
+	v_repo_url  string // the url of the V repository. It can be a local folder path, if you want to eliminate network operations...
+	vc_repo_url string // the url of the vc repository. It can be a local folder path, if you want to eliminate network operations...
+	show_help   bool   // whether to show the usage screen
+	verbose     bool   // should the tool be much more verbose
+}
+
+pub fn add_common_tool_options(mut context VGitOptions, mut fp flag.FlagParser) []string {
+	tdir := os.temp_dir()
+	context.workdir = os.real_path(fp.string('workdir', `w`, context.workdir, 'A writable base folder. Default: $tdir'))
+	context.v_repo_url = fp.string('vrepo', 0, context.v_repo_url, 'The url of the V repository. You can clone it locally too. See also --vcrepo below.')
+	context.vc_repo_url = fp.string('vcrepo', 0, context.vc_repo_url, 'The url of the vc repository. You can clone it
+${flag.space}beforehand, and then just give the local folder
+${flag.space}path here. That will eliminate the network ops
+${flag.space}done by this tool, which is useful, if you want
+${flag.space}to script it/run it in a restrictive vps/docker.
+')
+	context.show_help = fp.bool('help', `h`, false, 'Show this help screen.')
+	context.verbose = fp.bool('verbose', `v`, false, 'Be more verbose.')
+	if context.show_help {
+		println(fp.usage())
+		exit(0)
+	}
+	if context.verbose {
+		scripting.set_verbose(true)
+	}
+	if os.is_dir(context.v_repo_url) {
+		context.v_repo_url = os.real_path(context.v_repo_url)
+	}
+	if os.is_dir(context.vc_repo_url) {
+		context.vc_repo_url = os.real_path(context.vc_repo_url)
+	}
+	commits := fp.finalize() or {
+		eprintln('Error: $err')
+		exit(1)
+	}
+	for commit in commits {
+		validate_commit_exists(commit)
+	}
+	return commits
+}
diff --git a/v_windows/v/cmd/tools/modules/vhelp/vhelp.v b/v_windows/v/cmd/tools/modules/vhelp/vhelp.v
new file mode 100644
index 0000000..347ba75
--- /dev/null
+++ b/v_windows/v/cmd/tools/modules/vhelp/vhelp.v
@@ -0,0 +1,14 @@
+module vhelp
+
+import os
+
+pub fn show_topic(topic string) {
+	vexe := os.real_path(os.getenv('VEXE'))
+	vroot := os.dir(vexe)
+	target_topic := os.join_path(vroot, 'cmd', 'v', 'help', '${topic}.txt')
+	content := os.read_file(target_topic) or {
+		eprintln('Unknown topic: $topic')
+		exit(1)
+	}
+	println(content)
+}
diff --git a/v_windows/v/cmd/tools/oldv.v b/v_windows/v/cmd/tools/oldv.v
new file mode 100644
index 0000000..03eaf83
--- /dev/null
+++ b/v_windows/v/cmd/tools/oldv.v
@@ -0,0 +1,176 @@
+import os
+import flag
+import scripting
+import vgit
+
+const (
+	tool_version     = '0.0.3'
+	tool_description = '  Checkout an old V and compile it as it was on specific commit.
+|     This tool is useful, when you want to discover when something broke.
+|     It is also useful, when you just want to experiment with an older historic V.
+|
+|     The VCOMMIT argument can be a git commitish like HEAD or master and so on.
+|     When oldv is used with git bisect, you probably want to give HEAD. For example:
+|          git bisect start
+|          git bisect bad
+|          git checkout known_good_commit
+|          git bisect good
+|              ## Now git will automatically checkout a middle commit between the bad and the good
+|          cmd/tools/oldv HEAD --command="run commands in oldv folder, to verify if the commit is good or bad"
+|              ## See what the result is, and either do: ...
+|          git bisect good
+|              ## ... or do:
+|          git bisect bad
+|              ## Now you just repeat the above steps, each time running oldv with the same command, then mark the result as good or bad,
+|              ## until you find the commit, where the problem first occurred.
+|              ## When you finish, do not forget to do:
+|          git bisect reset'.strip_margin()
+)
+
+struct Context {
+mut:
+	vgo           vgit.VGitOptions
+	vgcontext     vgit.VGitContext
+	commit_v      string = 'master' // the commit from which you want to produce a working v compiler (this may be a commit-ish too)
+	commit_v_hash string // this will be filled from the commit-ish commit_v using rev-list. It IS a commit hash.
+	path_v        string // the full path to the v folder inside workdir.
+	path_vc       string // the full path to the vc folder inside workdir.
+	cmd_to_run    string // the command that you want to run *in* the oldv repo
+	cc            string = 'cc' // the C compiler to use for bootstrapping.
+	cleanup       bool   // should the tool run a cleanup first
+	use_cache     bool   // use local cached copies for --vrepo and --vcrepo in
+	fresh_tcc     bool   // do use `make fresh_tcc`
+}
+
+fn (mut c Context) compile_oldv_if_needed() {
+	c.vgcontext = vgit.VGitContext{
+		workdir: c.vgo.workdir
+		v_repo_url: c.vgo.v_repo_url
+		vc_repo_url: c.vgo.vc_repo_url
+		cc: c.cc
+		commit_v: c.commit_v
+		path_v: c.path_v
+		path_vc: c.path_vc
+		make_fresh_tcc: c.fresh_tcc
+	}
+	c.vgcontext.compile_oldv_if_needed()
+	c.commit_v_hash = c.vgcontext.commit_v__hash
+	if !os.exists(c.vgcontext.vexepath) && c.cmd_to_run.len > 0 {
+		// NB: 125 is a special code, that git bisect understands as 'skip this commit'.
+		// it is used to inform git bisect that the current commit leads to a build failure.
+		exit(125)
+	}
+}
+
+const cache_oldv_folder = os.join_path(os.cache_dir(), 'oldv')
+
+const cache_oldv_folder_v = os.join_path(cache_oldv_folder, 'v')
+
+const cache_oldv_folder_vc = os.join_path(cache_oldv_folder, 'vc')
+
+fn sync_cache() {
+	scripting.verbose_trace(@FN, 'start')
+	if !os.exists(cache_oldv_folder) {
+		scripting.verbose_trace(@FN, 'creating $cache_oldv_folder')
+		scripting.mkdir_all(cache_oldv_folder) or {
+			scripting.verbose_trace(@FN, '## failed.')
+			exit(1)
+		}
+	}
+	scripting.chdir(cache_oldv_folder)
+	for reponame in ['v', 'vc'] {
+		repofolder := os.join_path(cache_oldv_folder, reponame)
+		if !os.exists(repofolder) {
+			scripting.verbose_trace(@FN, 'cloning to $repofolder')
+			scripting.exec('git clone --quiet https://github.com/vlang/$reponame $repofolder') or {
+				scripting.verbose_trace(@FN, '## error during clone: $err')
+				exit(1)
+			}
+		}
+		scripting.chdir(repofolder)
+		scripting.exec('git pull --quiet') or {
+			scripting.verbose_trace(@FN, 'pulling to $repofolder')
+			scripting.verbose_trace(@FN, '## error during pull: $err')
+			exit(1)
+		}
+	}
+	scripting.verbose_trace(@FN, 'done')
+}
+
+fn main() {
+	scripting.used_tools_must_exist(['git', 'cc'])
+	//
+	// Resetting VEXE here allows for `v run cmd/tools/oldv.v'.
+	// the parent V would have set VEXE, which later will
+	// affect the V's run from the tool itself.
+	os.setenv('VEXE', '', true)
+	//
+	mut context := Context{}
+	context.vgo.workdir = cache_oldv_folder
+	mut fp := flag.new_flag_parser(os.args)
+	fp.application(os.file_name(os.executable()))
+	fp.version(tool_version)
+	fp.description(tool_description)
+	fp.arguments_description('VCOMMIT')
+	fp.skip_executable()
+	context.use_cache = fp.bool('cache', `u`, true, 'Use a cache of local repositories for --vrepo and --vcrepo in \$HOME/.cache/oldv/')
+	if context.use_cache {
+		context.vgo.v_repo_url = cache_oldv_folder_v
+		context.vgo.vc_repo_url = cache_oldv_folder_vc
+	} else {
+		context.vgo.v_repo_url = 'https://github.com/vlang/v'
+		context.vgo.vc_repo_url = 'https://github.com/vlang/vc'
+	}
+	should_sync := fp.bool('cache-sync', `s`, false, 'Update the local cache')
+	if !should_sync {
+		fp.limit_free_args(1, 1)
+	}
+	////
+	context.cleanup = fp.bool('clean', 0, false, 'Clean before running (slower).')
+	context.fresh_tcc = fp.bool('fresh_tcc', 0, true, 'Do `make fresh_tcc` when preparing a V compiler.')
+	context.cmd_to_run = fp.string('command', `c`, '', 'Command to run in the old V repo.\n')
+	commits := vgit.add_common_tool_options(mut context.vgo, mut fp)
+	if should_sync {
+		sync_cache()
+		exit(0)
+	}
+	if context.use_cache {
+		if !os.is_dir(cache_oldv_folder_v) || !os.is_dir(cache_oldv_folder_vc) {
+			sync_cache()
+		}
+	}
+	if commits.len > 0 {
+		context.commit_v = commits[0]
+	} else {
+		context.commit_v = scripting.run('git rev-list -n1 HEAD')
+	}
+	scripting.cprintln('#################  context.commit_v: $context.commit_v #####################')
+	context.path_v = vgit.normalized_workpath_for_commit(context.vgo.workdir, context.commit_v)
+	context.path_vc = vgit.normalized_workpath_for_commit(context.vgo.workdir, 'vc')
+	if !os.is_dir(context.vgo.workdir) {
+		eprintln('Work folder: $context.vgo.workdir , does not exist.')
+		exit(2)
+	}
+	ecc := os.getenv('CC')
+	if ecc != '' {
+		context.cc = ecc
+	}
+	if context.cleanup {
+		scripting.rmrf(context.path_v)
+		scripting.rmrf(context.path_vc)
+	}
+	context.compile_oldv_if_needed()
+	scripting.chdir(context.path_v)
+	shorter_hash := context.commit_v_hash[0..10]
+	scripting.cprintln('#     v commit hash: $shorter_hash | folder: $context.path_v')
+	if context.cmd_to_run.len > 0 {
+		scripting.cprintln_strong('#           command: ${context.cmd_to_run:-34s}')
+		cmdres := os.execute_or_exit(context.cmd_to_run)
+		if cmdres.exit_code != 0 {
+			scripting.cprintln_strong('#         exit code: ${cmdres.exit_code:-4d}')
+		}
+		scripting.cprint_strong('#            result: ')
+		print(cmdres.output)
+		exit(cmdres.exit_code)
+	}
+}
diff --git a/v_windows/v/cmd/tools/performance_compare.v b/v_windows/v/cmd/tools/performance_compare.v
new file mode 100644
index 0000000..6723231
--- /dev/null
+++ b/v_windows/v/cmd/tools/performance_compare.v
@@ -0,0 +1,215 @@
+import os
+import flag
+import scripting
+import vgit
+
+const (
+	tool_version     = '0.0.5'
+	tool_description = "  Compares V executable size and performance,
+|  between 2 commits from V's local git history.
+|  When only one commit is given, it is compared to master.
+|  ".strip_margin()
+)
+
+struct Context {
+	cwd string // current working folder
+mut:
+	vgo           vgit.VGitOptions
+	a             string // the full path to the 'after' folder inside workdir
+	b             string // the full path to the 'before' folder inside workdir
+	vc            string // the full path to the vc folder inside workdir. It is used during bootstrapping v from the C source.
+	commit_before string // the git commit for the 'before' state
+	commit_after  string // the git commit for the 'after' state
+	warmups       int    // how many times to execute a command before gathering stats
+	hyperfineopts string // use for additional CLI options that will be given to the hyperfine command
+	vflags        string // other v options to pass to compared v commands
+}
+
+fn new_context() Context {
+	return Context{
+		cwd: os.getwd()
+		commit_after: 'master'
+		warmups: 4
+	}
+}
+
+fn (c Context) compare_versions() {
+	// Input is validated at this point...
+	// Cleanup artifacts from previous runs of this tool:
+	scripting.chdir(c.vgo.workdir)
+	scripting.run('rm -rf "$c.a" "$c.b" "$c.vc" ')
+	// clone the VC source *just once per comparison*, and reuse it:
+	scripting.run('git clone --quiet "$c.vgo.vc_repo_url" "$c.vc" ')
+	println('Comparing V performance of commit $c.commit_before (before) vs commit $c.commit_after (after) ...')
+	c.prepare_v(c.b, c.commit_before)
+	c.prepare_v(c.a, c.commit_after)
+	scripting.chdir(c.vgo.workdir)
+	if c.vflags.len > 0 {
+		os.setenv('VFLAGS', c.vflags, true)
+	}
+	// The first is the baseline, against which all the others will be compared.
+	// It is the fastest, since hello_world.v has only a single println in it,
+	mut perf_files := []string{}
+	perf_files << c.compare_v_performance('source_hello', [
+		'vprod @DEBUG@ -o source.c examples/hello_world.v',
+		'vprod         -o source.c examples/hello_world.v',
+		'v     @DEBUG@ -o source.c examples/hello_world.v',
+		'v             -o source.c examples/hello_world.v',
+	])
+	perf_files << c.compare_v_performance('source_v', ['vprod @DEBUG@ -o source.c @COMPILER@',
+		'vprod         -o source.c @COMPILER@', 'v     @DEBUG@ -o source.c @COMPILER@',
+		'v             -o source.c @COMPILER@',
+	])
+	perf_files << c.compare_v_performance('binary_hello', [
+		'vprod         -o hello    examples/hello_world.v',
+		'v             -o hello    examples/hello_world.v',
+	])
+	perf_files << c.compare_v_performance('binary_v', ['vprod         -o binary   @COMPILER@',
+		'v             -o binary   @COMPILER@',
+	])
+	println('All performance files:')
+	for f in perf_files {
+		println('   $f')
+	}
+}
+
+fn (c &Context) prepare_v(cdir string, commit string) {
+	mut cc := os.getenv('CC')
+	if cc == '' {
+		cc = 'cc'
+	}
+	mut vgit_context := vgit.VGitContext{
+		cc: cc
+		commit_v: commit
+		path_v: cdir
+		path_vc: c.vc
+		workdir: c.vgo.workdir
+		v_repo_url: c.vgo.v_repo_url
+		vc_repo_url: c.vgo.vc_repo_url
+	}
+	vgit_context.compile_oldv_if_needed()
+	scripting.chdir(cdir)
+	println('Making a v compiler in $cdir')
+	scripting.run('./v -cc $cc       -o v     $vgit_context.vvlocation')
+	println('Making a vprod compiler in $cdir')
+	scripting.run('./v -cc $cc -prod -o vprod $vgit_context.vvlocation')
+	println('Stripping and compressing cv v and vprod binaries in $cdir')
+	scripting.run('cp    cv     cv_stripped')
+	scripting.run('cp     v      v_stripped')
+	scripting.run('cp vprod  vprod_stripped')
+	scripting.run('strip *_stripped')
+	scripting.run('cp cv_stripped cv_stripped_upxed')
+	scripting.run('cp  v_stripped  v_stripped_upxed')
+	scripting.run('cp vprod_stripped vprod_stripped_upxed')
+	scripting.run('upx -qqq --lzma    cv_stripped_upxed')
+	scripting.run('upx -qqq --lzma     v_stripped_upxed')
+	scripting.run('upx -qqq --lzma vprod_stripped_upxed')
+	scripting.show_sizes_of_files(['$cdir/cv', '$cdir/cv_stripped', '$cdir/cv_stripped_upxed'])
+	scripting.show_sizes_of_files(['$cdir/v', '$cdir/v_stripped', '$cdir/v_stripped_upxed'])
+	scripting.show_sizes_of_files(['$cdir/vprod', '$cdir/vprod_stripped',
+		'$cdir/vprod_stripped_upxed',
+	])
+	vversion := scripting.run('$cdir/v -version')
+	vcommit := scripting.run('git rev-parse --short  --verify HEAD')
+	println('V version is: $vversion , local source commit: $vcommit')
+	if vgit_context.vvlocation == 'cmd/v' {
+		if os.exists('vlib/v/ast/ast.v') {
+			println('Source lines of the compiler: ' +
+				scripting.run('find cmd/v/ vlib/v/ -name "*.v" | grep -v /tests/ | xargs wc | tail -n -1'))
+		} else {
+			println('Source lines of the compiler: ' +
+				scripting.run('wc cmd/v/*.v vlib/compiler/*.v | tail -n -1'))
+		}
+	} else if vgit_context.vvlocation == 'v.v' {
+		println('Source lines of the compiler: ' +
+			scripting.run('wc v.v vlib/compiler/*.v | tail -n -1'))
+	} else {
+		println('Source lines of the compiler: ' + scripting.run('wc compiler/*.v | tail -n -1'))
+	}
+}
+
+fn (c Context) compare_v_performance(label string, commands []string) string {
+	println('---------------------------------------------------------------------------------')
+	println('Compare v performance when doing the following commands ($label):')
+	mut source_location_a := ''
+	mut source_location_b := ''
+	if os.exists('$c.a/cmd/v') {
+		source_location_a = 'cmd/v'
+	} else {
+		source_location_a = if os.exists('$c.a/v.v') { 'v.v       ' } else { 'compiler/ ' }
+	}
+	if os.exists('$c.b/cmd/v') {
+		source_location_b = 'cmd/v'
+	} else {
+		source_location_b = if os.exists('$c.b/v.v') { 'v.v       ' } else { 'compiler/ ' }
+	}
+	timestamp_a, _ := vgit.line_to_timestamp_and_commit(scripting.run('cd $c.a/ ; git rev-list -n1 --timestamp HEAD'))
+	timestamp_b, _ := vgit.line_to_timestamp_and_commit(scripting.run('cd $c.b/ ; git rev-list -n1 --timestamp HEAD'))
+	debug_option_a := if timestamp_a > 1570877641 { '-cg    ' } else { '-debug ' }
+	debug_option_b := if timestamp_b > 1570877641 { '-cg    ' } else { '-debug ' }
+	mut hyperfine_commands_arguments := []string{}
+	for cmd in commands {
+		println(cmd)
+	}
+	for cmd in commands {
+		hyperfine_commands_arguments << ' \'cd ${c.b:-34s} ; ./$cmd \' '.replace_each([
+			'@COMPILER@',
+			source_location_b,
+			'@DEBUG@',
+			debug_option_b,
+		])
+	}
+	for cmd in commands {
+		hyperfine_commands_arguments << ' \'cd ${c.a:-34s} ; ./$cmd \' '.replace_each([
+			'@COMPILER@',
+			source_location_a,
+			'@DEBUG@',
+			debug_option_a,
+		])
+	}
+	// /////////////////////////////////////////////////////////////////////////////
+	cmd_stats_file := os.real_path([c.vgo.workdir, 'v_performance_stats_${label}.json'].join(os.path_separator))
+	comparison_cmd := 'hyperfine $c.hyperfineopts ' + '--export-json $cmd_stats_file ' +
+		'--time-unit millisecond ' + '--style full --warmup $c.warmups ' +
+		hyperfine_commands_arguments.join(' ')
+	// /////////////////////////////////////////////////////////////////////////////
+	if c.vgo.verbose {
+		println(comparison_cmd)
+	}
+	os.system(comparison_cmd)
+	println('The detailed performance comparison report was saved to: $cmd_stats_file .')
+	println('')
+	return cmd_stats_file
+}
+
+fn main() {
+	scripting.used_tools_must_exist(['cp', 'rm', 'strip', 'make', 'git', 'upx', 'cc', 'wc', 'tail',
+		'find', 'xargs', 'hyperfine'])
+	mut context := new_context()
+	mut fp := flag.new_flag_parser(os.args)
+	fp.application(os.file_name(os.executable()))
+	fp.version(tool_version)
+	fp.description(tool_description)
+	fp.arguments_description('COMMIT_BEFORE [COMMIT_AFTER]')
+	fp.skip_executable()
+	fp.limit_free_args(1, 2)
+	context.vflags = fp.string('vflags', 0, '', 'Additional options to pass to the v commands, for example "-cc tcc"')
+	context.hyperfineopts = fp.string('hyperfine_options', 0, '', 'Additional options passed to hyperfine.
+${flag.space}For example on linux, you may want to pass:
+$flag.space--hyperfine_options "--prepare \'sync; echo 3 | sudo tee /proc/sys/vm/drop_caches\'"
+')
+	commits := vgit.add_common_tool_options(mut context.vgo, mut fp)
+	context.commit_before = commits[0]
+	if commits.len > 1 {
+		context.commit_after = commits[1]
+	}
+	context.b = vgit.normalized_workpath_for_commit(context.vgo.workdir, context.commit_before)
+	context.a = vgit.normalized_workpath_for_commit(context.vgo.workdir, context.commit_after)
+	context.vc = vgit.normalized_workpath_for_commit(context.vgo.workdir, 'vc')
+	if !os.is_dir(context.vgo.workdir) {
+		msg := 'Work folder: ' + context.vgo.workdir + ' , does not exist.'
+		eprintln(msg)
+		exit(2)
+	}
+	context.compare_versions()
+}
diff --git a/v_windows/v/cmd/tools/repeat.v b/v_windows/v/cmd/tools/repeat.v
new file mode 100644
index 0000000..e69cfdf
--- /dev/null
+++ b/v_windows/v/cmd/tools/repeat.v
@@ -0,0 +1,374 @@
+module main
+
+import os
+import flag
+import time
+import term
+import math
+import scripting
+
+struct CmdResult {
+mut:
+	runs    int
+	cmd     string
+	icmd    int
+	outputs []string
+	oms     map[string][]int
+	summary map[string]Aints
+	timings []int
+	atiming Aints
+}
+
+struct Context {
+mut:
+	count                   int
+	series                  int
+	warmup                  int
+	show_help               bool
+	show_output             bool
+	use_newline             bool // use \n instead of \r, so the last line is not overwritten
+	fail_on_regress_percent int
+	fail_on_maxtime         int // in ms
+	verbose                 bool
+	commands                []string
+	results                 []CmdResult
+	cmd_template            string // {T} will be substituted with the current command
+	cmd_params              map[string][]string
+	cline                   string // a terminal clearing line
+	cgoback                 string
+	nmins                   int // number of minimums to discard
+	nmaxs                   int // number of maximums to discard
+}
+
+[unsafe]
+fn (mut result CmdResult) free() {
+	unsafe {
+		result.cmd.free()
+		result.outputs.free()
+		result.oms.free()
+		result.summary.free()
+		result.timings.free()
+		result.atiming.free()
+	}
+}
+
+[unsafe]
+fn (mut context Context) free() {
+	unsafe {
+		context.commands.free()
+		context.results.free()
+		context.cmd_template.free()
+		context.cmd_params.free()
+		context.cline.free()
+		context.cgoback.free()
+	}
+}
+
+struct Aints {
+	values []int
+mut:
+	imin    int
+	imax    int
+	average f64
+	stddev  f64
+	nmins   int // number of discarded fastest results
+	nmaxs   int // number of discarded slowest results
+}
+
+[unsafe]
+fn (mut a Aints) free() {
+	unsafe { a.values.free() }
+}
+
+fn new_aints(ovals []int, extreme_mins int, extreme_maxs int) Aints {
+	mut res := Aints{
+		values: ovals // remember the original values
+		nmins: extreme_mins
+		nmaxs: extreme_maxs
+	}
+	mut sum := i64(0)
+	mut imin := math.max_i32
+	mut imax := -math.max_i32
+	// discard the extremes:
+	mut vals := []int{}
+	for x in ovals {
+		vals << x
+	}
+	vals.sort()
+	if vals.len > extreme_mins + extreme_maxs {
+		vals = vals[extreme_mins..vals.len - extreme_maxs].clone()
+	} else {
+		vals = []
+	}
+	// statistical processing of the remaining values:
+	for i in vals {
+		sum += i
+		if i < imin {
+			imin = i
+		}
+		if i > imax {
+			imax = i
+		}
+	}
+	res.imin = imin
+	res.imax = imax
+	if vals.len > 0 {
+		res.average = sum / f64(vals.len)
+	}
+	//
+	mut devsum := f64(0.0)
+	for i in vals {
+		x := f64(i) - res.average
+		devsum += (x * x)
+	}
+	res.stddev = math.sqrt(devsum / f64(vals.len))
+	// eprintln('\novals: $ovals\n vals: $vals\n vals.len: $vals.len |  res.imin: $res.imin | res.imax: $res.imax | res.average: $res.average | res.stddev: $res.stddev')
+	return res
+}
+
+fn bold(s string) string {
+	return term.colorize(term.bold, s)
+}
+
+fn (a Aints) str() string {
+	return bold('${a.average:6.2f}') +
+		'ms ± σ: ${a.stddev:4.1f}ms, min: ${a.imin:4}ms, max: ${a.imax:4}ms, runs:${a.values.len:3}, nmins:${a.nmins:2}, nmaxs:${a.nmaxs:2}'
+}
+
+const (
+	max_fail_percent             = 100 * 1000
+	max_time                     = 60 * 1000 // ms
+	performance_regression_label = 'Performance regression detected, failing since '
+)
+
+fn main() {
+	mut context := Context{}
+	context.parse_options()
+	context.run()
+	context.show_diff_summary()
+}
+
+fn (mut context Context) parse_options() {
+	mut fp := flag.new_flag_parser(os.args)
+	fp.application(os.file_name(os.executable()))
+	fp.version('0.0.1')
+	fp.description('Repeat command(s) and collect statistics. NB: you have to quote each command, if it contains spaces.')
+	fp.arguments_description('CMD1 CMD2 ...')
+	fp.skip_executable()
+	fp.limit_free_args_to_at_least(1)
+	context.count = fp.int('count', `c`, 10, 'Repetition count.')
+	context.series = fp.int('series', `s`, 2, 'Series count. `-s 2 -c 4 a b` => aaaabbbbaaaabbbb, while `-s 3 -c 2 a b` => aabbaabbaabb.')
+	context.warmup = fp.int('warmup', `w`, 2, 'Warmup runs. These are done *only at the start*, and are ignored.')
+	context.show_help = fp.bool('help', `h`, false, 'Show this help screen.')
+	context.use_newline = fp.bool('newline', `n`, false, 'Use \\n, do not overwrite the last line. Produces more output, but easier to diagnose.')
+	context.show_output = fp.bool('output', `O`, false, 'Show command stdout/stderr in the progress indicator for each command. NB: slower, for verbose commands.')
+	context.verbose = fp.bool('verbose', `v`, false, 'Be more verbose.')
+	context.fail_on_maxtime = fp.int('max_time', `m`, max_time, 'Fail with exit code 2, when first cmd takes above M milliseconds (regression).')
+	context.fail_on_regress_percent = fp.int('fail_percent', `f`, max_fail_percent, 'Fail with exit code 3, when first cmd is X% slower than the rest (regression).')
+	context.cmd_template = fp.string('template', `t`, '{T}', 'Command template. {T} will be substituted with the current command.')
+	cmd_params := fp.string_multi('parameter', `p`, 'A parameter substitution list. `{p}=val1,val2,val2` means that {p} in the template, will be substituted with each of val1, val2, val3.')
+	context.nmins = fp.int('nmins', `i`, 0, 'Ignore the BOTTOM X results (minimum execution time). Makes the results more robust to performance flukes.')
+	context.nmaxs = fp.int('nmaxs', `a`, 1, 'Ignore the TOP X results (maximum execution time). Makes the results more robust to performance flukes.')
+	for p in cmd_params {
+		parts := p.split(':')
+		if parts.len > 1 {
+			context.cmd_params[parts[0]] = parts[1].split(',')
+		}
+	}
+	if context.show_help {
+		println(fp.usage())
+		exit(0)
+	}
+	if context.verbose {
+		scripting.set_verbose(true)
+	}
+	commands := fp.finalize() or {
+		eprintln('Error: $err')
+		exit(1)
+	}
+	context.commands = context.expand_all_commands(commands)
+	context.results = []CmdResult{len: context.commands.len, cap: 20, init: CmdResult{
+		outputs: []string{cap: 500}
+		timings: []int{cap: 500}
+	}}
+	if context.use_newline {
+		context.cline = '\n'
+		context.cgoback = '\n'
+	} else {
+		context.cline = '\r' + term.h_divider('')
+		context.cgoback = '\r'
+	}
+}
+
+fn (mut context Context) clear_line() {
+	print(context.cline)
+}
+
+fn (mut context Context) expand_all_commands(commands []string) []string {
+	mut all_commands := []string{}
+	for cmd in commands {
+		maincmd := context.cmd_template.replace('{T}', cmd)
+		mut substituted_commands := []string{}
+		substituted_commands << maincmd
+		for paramk, paramlist in context.cmd_params {
+			for paramv in paramlist {
+				mut new_substituted_commands := []string{}
+				for cscmd in substituted_commands {
+					scmd := cscmd.replace(paramk, paramv)
+					new_substituted_commands << scmd
+				}
+				for sc in new_substituted_commands {
+					substituted_commands << sc
+				}
+			}
+		}
+		for sc in substituted_commands {
+			all_commands << sc
+		}
+	}
+	mut unique := map[string]int{}
+	for x in all_commands {
+		if x.contains('{') && x.contains('}') {
+			continue
+		}
+		unique[x] = 1
+	}
+	return unique.keys()
+}
+
+fn (mut context Context) run() {
+	mut run_warmups := 0
+	for si in 1 .. context.series + 1 {
+		for icmd, cmd in context.commands {
+			mut runs := 0
+			mut duration := 0
+			mut sum := 0
+			mut oldres := ''
+			println('Series: ${si:4}/${context.series:-4}, command: $cmd')
+			if context.warmup > 0 && run_warmups < context.commands.len {
+				for i in 1 .. context.warmup + 1 {
+					print('${context.cgoback}warming up run: ${i:4}/${context.warmup:-4} for ${cmd:-50s} took ${duration:6} ms ...')
+					mut sw := time.new_stopwatch()
+					res := os.execute(cmd)
+					if res.exit_code != 0 {
+						continue
+					}
+					duration = int(sw.elapsed().milliseconds())
+				}
+				run_warmups++
+			}
+			context.clear_line()
+			for i in 1 .. (context.count + 1) {
+				avg := f64(sum) / f64(i)
+				print('${context.cgoback}Average: ${avg:9.3f}ms | run: ${i:4}/${context.count:-4} | took ${duration:6} ms')
+				if context.show_output {
+					print(' | result: ${oldres:s}')
+				}
+				mut sw := time.new_stopwatch()
+				res := scripting.exec(cmd) or { continue }
+				duration = int(sw.elapsed().milliseconds())
+				if res.exit_code != 0 {
+					eprintln('${i:10} non 0 exit code for cmd: $cmd')
+					continue
+				}
+				trimed_output := res.output.trim_right('\r\n')
+				trimed_normalized := trimed_output.replace('\r\n', '\n')
+				lines := trimed_normalized.split('\n')
+				for line in lines {
+					context.results[icmd].outputs << line
+				}
+				context.results[icmd].timings << duration
+				sum += duration
+				runs++
+				oldres = res.output.replace('\n', ' ')
+			}
+			context.results[icmd].cmd = cmd
+			context.results[icmd].icmd = icmd
+			context.results[icmd].runs += runs
+			context.results[icmd].atiming = new_aints(context.results[icmd].timings, context.nmins,
+				context.nmaxs)
+			context.clear_line()
+			print(context.cgoback)
+			mut m := map[string][]int{}
+			ioutputs := context.results[icmd].outputs
+			for o in ioutputs {
+				x := o.split(':')
+				if x.len > 1 {
+					k := x[0]
+					v := x[1].trim_left(' ').int()
+					m[k] << v
+				}
+			}
+			mut summary := map[string]Aints{}
+			for k, v in m {
+				// show a temporary summary for the current series/cmd cycle
+				s := new_aints(v, context.nmins, context.nmaxs)
+				println('  $k: $s')
+				summary[k] = s
+			}
+			// merge current raw results to the previous ones
+			old_oms := context.results[icmd].oms.move()
+			mut new_oms := map[string][]int{}
+			for k, v in m {
+				if old_oms[k].len == 0 {
+					new_oms[k] = v
+				} else {
+					new_oms[k] << old_oms[k]
+					new_oms[k] << v
+				}
+			}
+			context.results[icmd].oms = new_oms.move()
+			// println('')
+		}
+	}
+	// create full summaries, taking account of all runs
+	for icmd in 0 .. context.results.len {
+		mut new_full_summary := map[string]Aints{}
+		for k, v in context.results[icmd].oms {
+			new_full_summary[k] = new_aints(v, context.nmins, context.nmaxs)
+		}
+		context.results[icmd].summary = new_full_summary.move()
+	}
+}
+
+fn (mut context Context) show_diff_summary() {
+	context.results.sort_with_compare(fn (a &CmdResult, b &CmdResult) int {
+		if a.atiming.average < b.atiming.average {
+			return -1
+		}
+		if a.atiming.average > b.atiming.average {
+			return 1
+		}
+		return 0
+	})
+	println('Summary (commands are ordered by ascending mean time), after $context.series series of $context.count repetitions:')
+	base := context.results[0].atiming.average
+	mut first_cmd_percentage := f64(100.0)
+	mut first_marker := ''
+	for i, r in context.results {
+		first_marker = ' '
+		cpercent := (r.atiming.average / base) * 100 - 100
+		if r.icmd == 0 {
+			first_marker = bold('>')
+			first_cmd_percentage = cpercent
+		}
+		println(' $first_marker${(i + 1):3} | ${cpercent:5.1f}% slower | ${r.cmd:-57s} | $r.atiming')
+	}
+	$if debugcontext ? {
+		println('context: $context')
+	}
+	if int(base) > context.fail_on_maxtime {
+		print(performance_regression_label)
+		println('average time: ${base:6.1f} ms > $context.fail_on_maxtime ms threshold.')
+		exit(2)
+	}
+	if context.fail_on_regress_percent == max_fail_percent || context.results.len < 2 {
+		return
+	}
+	fail_threshold_max := f64(context.fail_on_regress_percent)
+	if first_cmd_percentage > fail_threshold_max {
+		print(performance_regression_label)
+		println('${first_cmd_percentage:5.1f}% > ${fail_threshold_max:5.1f}% threshold.')
+		exit(3)
+	}
+}
diff --git a/v_windows/v/cmd/tools/test_if_v_test_system_works.v b/v_windows/v/cmd/tools/test_if_v_test_system_works.v
new file mode 100644
index 0000000..a86abd8
--- /dev/null
+++ b/v_windows/v/cmd/tools/test_if_v_test_system_works.v
@@ -0,0 +1,74 @@
+module main
+
+// This program verifies that `v test` propagates errors
+// and that it exits with code 1, when at least 1 FAIL happen.
+import os
+import rand
+
+const (
+	vexe  = get_vexe_path()
+	vroot = os.dir(vexe)
+	tdir  = new_tdir()
+)
+
+fn get_vexe_path() string {
+	env_vexe := os.getenv('VEXE')
+	if env_vexe != '' {
+		return env_vexe
+	}
+	me := os.executable()
+	eprintln('me: $me')
+	mut vexe_ := os.join_path(os.dir(os.dir(os.dir(me))), 'v')
+	if os.user_os() == 'windows' {
+		vexe_ += '.exe'
+	}
+	return vexe_
+}
+
+fn new_tdir() string {
+	tdir_ := os.join_path(os.temp_dir(), rand.ulid())
+	if os.exists(tdir_) {
+		os.rmdir(tdir_) or { panic(err) }
+	}
+	os.mkdir(tdir_) or { panic(err) }
+	C.atexit(cleanup_tdir)
+	return tdir_
+}
+
+fn cleanup_tdir() {
+	println('... removing tdir: $tdir')
+	os.rmdir_all(tdir) or { panic(err) }
+}
+
+fn main() {
+	println('> vroot: $vroot | vexe: $vexe | tdir: $tdir')
+	ok_fpath := os.join_path(tdir, 'single_test.v')
+	os.write_file(ok_fpath, 'fn test_ok(){ assert true }') ?
+	check_ok('"$vexe" $ok_fpath')
+	check_ok('"$vexe" test $ok_fpath')
+	fail_fpath := os.join_path(tdir, 'failing_test.v')
+	os.write_file(fail_fpath, 'fn test_fail(){ assert 1 == 2 }') ?
+	check_fail('"$vexe" $fail_fpath')
+	check_fail('"$vexe" test $fail_fpath')
+	check_fail('"$vexe" test $tdir')
+}
+
+fn check_ok(cmd string) string {
+	println('>   check_ok cmd: $cmd')
+	res := os.execute(cmd)
+	if res.exit_code != 0 {
+		eprintln('>   check_ok failed.\n$res.output')
+		exit(1)
+	}
+	return res.output
+}
+
+fn check_fail(cmd string) string {
+	println('> check_fail cmd: $cmd')
+	res := os.execute(cmd)
+	if res.exit_code == 0 {
+		eprintln('> check_fail succeeded, but it should have failed.\n$res.output')
+		exit(1)
+	}
+	return res.output
+}
diff --git a/v_windows/v/cmd/tools/test_os_process.v b/v_windows/v/cmd/tools/test_os_process.v
new file mode 100644
index 0000000..bc275dd
--- /dev/null
+++ b/v_windows/v/cmd/tools/test_os_process.v
@@ -0,0 +1,82 @@
+module main
+
+import os
+import time
+import os.cmdline
+
+enum Target {
+	both
+	stderr
+	stdout
+	alternate
+}
+
+fn s2target(s string) Target {
+	return match s {
+		'both' { Target.both }
+		'stderr' { Target.stderr }
+		'alternate' { Target.alternate }
+		else { Target.stdout }
+	}
+}
+
+struct Context {
+mut:
+	timeout_ms int
+	period_ms  int
+	exitcode   int
+	target     Target
+	omode      Target
+	is_verbose bool
+}
+
+fn (mut ctx Context) println(s string) {
+	if ctx.target == .alternate {
+		ctx.omode = if ctx.omode == .stderr { Target.stdout } else { Target.stderr }
+	}
+	if ctx.target in [.both, .stdout] || ctx.omode == .stdout {
+		println('stdout, $s')
+	}
+	if ctx.target in [.both, .stderr] || ctx.omode == .stderr {
+		eprintln('stderr, $s')
+	}
+}
+
+fn do_timeout(c &Context) {
+	mut ctx := unsafe { c }
+	time.sleep(ctx.timeout_ms * time.millisecond)
+	exit(ctx.exitcode)
+}
+
+fn main() {
+	mut ctx := Context{}
+	args := os.args[1..]
+	if '-h' in args || '--help' in args {
+		println("Usage:
+	test_os_process [-v] [-h] [-target stderr/stdout/both/alternate] [-exitcode 0] [-timeout_ms 200] [-period_ms 50]
+		Prints lines periodically (-period_ms), to stdout/stderr (-target).
+		After a while (-timeout_ms), exit with (-exitcode).
+		This program is useful for platform independent testing
+		of child process/standart input/output control.
+		It is used in V's `os` module tests.
+")
+		return
+	}
+	ctx.is_verbose = '-v' in args
+	ctx.target = s2target(cmdline.option(args, '-target', 'both'))
+	ctx.exitcode = cmdline.option(args, '-exitcode', '0').int()
+	ctx.timeout_ms = cmdline.option(args, '-timeout_ms', '200').int()
+	ctx.period_ms = cmdline.option(args, '-period_ms', '50').int()
+	if ctx.target == .alternate {
+		ctx.omode = .stdout
+	}
+	if ctx.is_verbose {
+		eprintln('> args: $args | context: $ctx')
+	}
+	go do_timeout(&ctx)
+	for i := 1; true; i++ {
+		ctx.println('$i')
+		time.sleep(ctx.period_ms * time.millisecond)
+	}
+	time.sleep(100 * time.second)
+}
diff --git a/v_windows/v/cmd/tools/vast/cjson.v b/v_windows/v/cmd/tools/vast/cjson.v
new file mode 100644
index 0000000..63e9f5d
--- /dev/null
+++ b/v_windows/v/cmd/tools/vast/cjson.v
@@ -0,0 +1,114 @@
+module main
+
+import json
+
+struct UseJson {
+	x int
+}
+
+fn suppress_json_warning() {
+	json.encode(UseJson{})
+}
+
+// struct C.cJSON {}
+fn C.cJSON_CreateObject() &C.cJSON
+
+fn C.cJSON_CreateArray() &C.cJSON
+
+// fn C.cJSON_CreateBool(bool) &C.cJSON
+fn C.cJSON_CreateTrue() &C.cJSON
+
+fn C.cJSON_CreateFalse() &C.cJSON
+
+fn C.cJSON_CreateNull() &C.cJSON
+
+// fn C.cJSON_CreateNumber() &C.cJSON
+// fn C.cJSON_CreateString() &C.cJSON
+fn C.cJSON_CreateRaw(&byte) &C.cJSON
+
+fn C.cJSON_IsInvalid(voidptr) bool
+
+fn C.cJSON_IsFalse(voidptr) bool
+
+// fn C.cJSON_IsTrue(voidptr) bool
+fn C.cJSON_IsBool(voidptr) bool
+
+fn C.cJSON_IsNull(voidptr) bool
+
+fn C.cJSON_IsNumber(voidptr) bool
+
+fn C.cJSON_IsString(voidptr) bool
+
+fn C.cJSON_IsArray(voidptr) bool
+
+fn C.cJSON_IsObject(voidptr) bool
+
+fn C.cJSON_IsRaw(voidptr) bool
+
+fn C.cJSON_AddItemToObject(voidptr, &byte, voidptr)
+
+fn C.cJSON_AddItemToArray(voidptr, voidptr)
+
+fn C.cJSON_Delete(voidptr)
+
+fn C.cJSON_Print(voidptr) &byte
+
+[inline]
+fn create_object() &C.cJSON {
+	return C.cJSON_CreateObject()
+}
+
+[inline]
+fn create_array() &C.cJSON {
+	return C.cJSON_CreateArray()
+}
+
+[inline]
+fn create_string(val string) &C.cJSON {
+	return C.cJSON_CreateString(val.str)
+}
+
+[inline]
+fn create_number(val f64) &C.cJSON {
+	return C.cJSON_CreateNumber(val)
+}
+
+[inline]
+fn create_bool(val bool) &C.cJSON {
+	return C.cJSON_CreateBool(val)
+}
+
+[inline]
+fn create_true() &C.cJSON {
+	return C.cJSON_CreateTrue()
+}
+
+[inline]
+fn create_false() &C.cJSON {
+	return C.cJSON_CreateFalse()
+}
+
+[inline]
+fn create_null() &C.cJSON {
+	return C.cJSON_CreateNull()
+}
+
+[inline]
+fn delete(b voidptr) {
+	C.cJSON_Delete(b)
+}
+
+[inline]
+fn add_item_to_object(obj &C.cJSON, key string, item &C.cJSON) {
+	C.cJSON_AddItemToObject(obj, key.str, item)
+}
+
+[inline]
+fn add_item_to_array(obj &C.cJSON, item &C.cJSON) {
+	C.cJSON_AddItemToArray(obj, item)
+}
+
+fn json_print(json &C.cJSON) string {
+	s := C.cJSON_Print(json)
+	return unsafe { tos3(s) }
+}
diff --git a/v_windows/v/cmd/tools/vast/test/.gitignore b/v_windows/v/cmd/tools/vast/test/.gitignore
new file mode 100644
index 0000000..857cade
--- /dev/null
+++ b/v_windows/v/cmd/tools/vast/test/.gitignore
@@ -0,0 +1 @@
+demo.json
diff --git a/v_windows/v/cmd/tools/vast/test/demo.v b/v_windows/v/cmd/tools/vast/test/demo.v
new file mode 100644
index 0000000..536dc04
--- /dev/null
+++ b/v_windows/v/cmd/tools/vast/test/demo.v
@@ -0,0 +1,131 @@
+// usage test: v ast path_to_v/cmd/tools/vast/test/demo.v
+// will generate demo.json
+
+// comment for module
+module main
+
+// import module
+import os
+import math
+import time { Time, now }
+
+// const decl
+const (
+	a = 1
+	b = 3
+	c = 'c'
+)
+
+// struct decl
+struct Point {
+	x int
+mut:
+	y int
+pub:
+	z int
+pub mut:
+	name string
+}
+
+// method of Point
+pub fn (p Point) get_x() int {
+	return p.x
+}
+
+// embed struct
+struct MyPoint {
+	Point
+	title string
+}
+
+// enum type
+enum Color {
+	red
+	green
+	blue
+}
+
+// type alias
+type Myint = int
+
+// sum type
+type MySumType = bool | int | string
+
+// function type
+type Myfn = fn (int) int
+
+// interface type
+interface Myinterfacer {
+	add(int, int) int
+	sub(int, int) int
+}
+
+// main funciton
+fn main() {
+	add(1, 3)
+	println(add(1, 2))
+	println('ok') // comment println
+	arr := [1, 3, 5, 7]
+	for a in arr {
+		println(a)
+		add(1, 3)
+	}
+	color := Color.red
+	println(color)
+	println(os.args)
+	m := math.max(1, 3)
+	println(m)
+	println(now())
+	t := Time{}
+	println(t)
+	p := Point{
+		x: 1
+		y: 2
+		z: 3
+	}
+	println(p)
+	my_point := MyPoint{
+		// x: 1
+		// y: 3
+		// z: 5
+	}
+	println(my_point.get_x())
+}
+
+// normal function
+fn add(x int, y int) int {
+	return x + y
+}
+
+// function with defer stmt
+fn defer_fn() {
+	mut x := 1
+	println('start fn')
+	defer {
+		println('in defer block')
+		println(x)
+	}
+	println('end fn')
+}
+
+// generic function
+fn g_fn<T>(p T) T {
+	return p
+}
+
+// generic struct
+struct GenericStruct<T> {
+	point Point
+mut:
+	model T
+}
+
+// generic interface
+interface Gettable<T> {
+	get() T
+}
+
+// generic sumtype
+struct None {}
+
+type MyOption<T> = Error | None | T
diff --git a/v_windows/v/cmd/tools/vast/vast.v b/v_windows/v/cmd/tools/vast/vast.v
new file mode 100644
index 0000000..8a6c008
--- /dev/null
+++ b/v_windows/v/cmd/tools/vast/vast.v
@@ -0,0 +1,2272 @@
+module main
+
+import os
+import time
+import flag
+import v.token
+import v.parser
+import v.ast
+import v.pref
+import v.errors
+
+struct Context {
+mut:
+	is_watch   bool
+	is_compile bool
+	is_print   bool
+}
+
+struct HideFields {
+mut:
+	names map[string]bool
+}
+
+const hide_fields = &HideFields{}
+
+fn main() {
+	if os.args.len < 2 {
+		eprintln('not enough parameters')
+		exit(1)
+	}
+	mut ctx := Context{}
+	mut fp := flag.new_flag_parser(os.args[2..])
+	fp.application('v ast')
+	fp.usage_example('demo.v       generate demo.json file.')
+	fp.usage_example('-w demo.v    generate demo.json file, and watch for changes.')
+	fp.usage_example('-c demo.v    generate demo.json *and* a demo.c file, and watch for changes.')
+	fp.usage_example('-p demo.v    print the json output to stdout.')
+	fp.description('Dump a JSON representation of the V AST for a given .v or .vsh file.')
+	fp.description('By default, `v ast` will save the JSON to a .json file, named after the .v file.')
+	fp.description('Pass -p to see it instead.')
+	ctx.is_watch = fp.bool('watch', `w`, false, 'watch a .v file for changes, rewrite the .json file, when a change is detected')
+	ctx.is_print = fp.bool('print', `p`, false, 'print the AST to stdout')
+	ctx.is_compile = fp.bool('compile', `c`, false, 'watch the .v file for changes, rewrite the .json file, *AND* generate a .c file too on any change')
+	hfields := fp.string_multi('hide', 0, 'hide the specified fields. You can give several, by separating them with `,`').join(',')
+	mut mhf := unsafe { hide_fields }
+	for hf in hfields.split(',') {
+		mhf.names[hf] = true
+	}
+	fp.limit_free_args_to_at_least(1)
+	rest_of_args := fp.remaining_parameters()
+	for vfile in rest_of_args {
+		file := get_abs_path(vfile)
+		check_file(file)
+		ctx.write_file_or_print(file)
+		if ctx.is_watch || ctx.is_compile {
+			ctx.watch_for_changes(file)
+		}
+	}
+}
+
+fn (ctx Context) write_file_or_print(file string) {
+	if ctx.is_print {
+		println(json(file))
+	} else {
+		println('$time.now(): AST written to: ' + json_file(file))
+	}
+}
+
+// generate ast json file and c source code file
+fn (ctx Context) watch_for_changes(file string) {
+	println('start watching...')
+	mut timestamp := 0
+	for {
+		new_timestamp := os.file_last_mod_unix(file)
+		if timestamp != new_timestamp {
+			ctx.write_file_or_print(file)
+			if ctx.is_compile {
+				file_name := file[0..(file.len - os.file_ext(file).len)]
+				os.system('v -o ${file_name}.c $file')
+			}
+		}
+		timestamp = new_timestamp
+		time.sleep(500 * time.millisecond)
+	}
+}
+
+// get absolute path for file
+fn get_abs_path(path string) string {
+	if os.is_abs_path(path) {
+		return path
+	} else if path.starts_with('./') {
+		return os.join_path(os.getwd(), path[2..])
+	} else {
+		return os.join_path(os.getwd(), path)
+	}
+}
+
+// check file is v file and exists
+fn check_file(file string) {
+	if os.file_ext(file) !in ['.v', '.vv', '.vsh'] {
+		eprintln('the file `$file` must be a v file or vsh file')
+		exit(1)
+	}
+	if !os.exists(file) {
+		eprintln('the v file `$file` does not exist')
+		exit(1)
+	}
+}
+
+// generate json file with the same file name
+fn json_file(file string) string {
+	ast_json := json(file)
+	// support .v and .vsh file
+	file_name := file[0..(file.len - os.file_ext(file).len)]
+	json_file := file_name + '.json'
+	os.write_file(json_file, ast_json) or { panic(err) }
+	return json_file
+}
+
+// generate json string
+fn json(file string) string {
+	// use as permissive preferences as possible, so that `v ast`
+	// can print the AST of arbitrary V files, even .vsh or ones
+	// that require globals:
+	mut pref := &pref.Preferences{}
+	pref.fill_with_defaults()
+	pref.enable_globals = true
+	pref.is_fmt = true
+	//
+	mut t := Tree{
+		root: new_object()
+		table: ast.new_table()
+		pref: pref
+	}
+	// parse file with comment
+	ast_file := parser.parse_file(file, t.table, .parse_comments, t.pref)
+	t.root = t.ast_file(ast_file)
+	// generate the ast string
+	s := json_print(t.root)
+	return s
+}
+
+// the ast tree
+struct Tree {
+	table &ast.Table
+	pref  &pref.Preferences
+mut:
+	root Node // the root of tree
+}
+
+// tree node
+pub type Node = C.cJSON
+
+// create an object node
+[inline]
+fn new_object() &Node {
+	return C.cJSON_CreateObject()
+}
+
+// add item to object node
+[inline]
+fn (node &Node) add(key string, child &Node) {
+	if hide_fields.names.len > 0 && key in hide_fields.names {
+		return
+	}
+	add_item_to_object(node, key, child)
+}
+
+// create an array node
+[inline]
+fn new_array() &Node {
+	return C.cJSON_CreateArray()
+}
+
+// add item to array node
+[inline]
+fn (node &Node) add_item(child &Node) {
+	add_item_to_array(node, child)
+}
+
+// string type node
+fn (t Tree) string_node(val string) &Node {
+	return create_string(val)
+}
+
+// number type node
+fn (t Tree) number_node(val int) &Node {
+	return create_number(val)
+}
+
+// bool type node
+fn (t Tree) bool_node(val bool) &Node {
+	if val {
+		return create_true()
+	} else {
+		return create_false()
+	}
+}
+
+// null type node
+fn (t Tree) null_node() &Node {
+	return create_null()
+}
+
+// type node
+fn (t Tree) type_node(typ ast.Type) &Node {
+	if typ == 0 {
+		return create_null()
+	} else {
+		type_name := t.table.get_type_name(typ)
+		return create_string(type_name)
+	}
+}
+
+// token type node
+fn (t Tree) token_node(tok_kind token.Kind) &Node {
+	return t.string_node('token:${int(tok_kind)}($tok_kind.str())')
+}
+
+// enum type node
+fn (t Tree) enum_node<T>(value T) &Node {
+	return t.string_node('enum:${int(value)}($value)')
+}
+
+// for [][]comment
+fn (t Tree) two_dimension_comment(node [][]ast.Comment) &Node {
+	mut comments := new_array()
+	for n in node {
+		mut comment_array := new_array()
+		for c in n {
+			comment_array.add_item(t.comment(c))
+		}
+		comments.add_item(comment_array)
+	}
+	return comments
+}
+
+// ast file root node
+fn (t Tree) ast_file(node ast.File) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ast.File'))
+	obj.add('path', t.string_node(node.path))
+	obj.add('path_base', t.string_node(node.path_base))
+	obj.add('nr_lines', t.number_node(node.nr_lines))
+	obj.add('nr_bytes', t.number_node(node.nr_bytes))
+	obj.add('mod', t.mod(node.mod))
+	obj.add('imports', t.imports(node.imports))
+	obj.add('global_scope', t.scope(node.global_scope))
+	obj.add('scope', t.scope(node.scope))
+	obj.add('errors', t.errors(node.errors))
+	obj.add('warnings', t.warnings(node.warnings))
+	obj.add('notices', t.notices(node.notices))
+	obj.add('auto_imports', t.array_node_string(node.auto_imports))
+	symbol_obj := new_object()
+	for key, val in node.imported_symbols {
+		symbol_obj.add(key, t.string_node(val))
+	}
+	obj.add('imported_symbols', symbol_obj)
+	obj.add('generic_fns', t.array_node_generic_fns(node.generic_fns))
+	obj.add('embedded_files', t.array_node_embed_file(node.embedded_files))
+	obj.add('global_labels', t.array_node_string(node.global_labels))
+	obj.add('is_test', t.bool_node(node.is_test))
+	obj.add('stmts', t.stmts(node.stmts))
+	return obj
+}
+
+// embed files
+fn (t Tree) embed_file(node ast.EmbeddedFile) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('EmbeddedFile'))
+	obj.add('rpath', t.string_node(node.rpath))
+	obj.add('apath', t.string_node(node.apath))
+	return obj
+}
+
+// ast module node
+fn (t Tree) mod(node ast.Module) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Module'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('short_name', t.string_node(node.short_name))
+	obj.add('attrs', t.array_node_attr(node.attrs))
+	obj.add('pos', t.position(node.pos))
+	obj.add('name_pos', t.position(node.name_pos))
+	obj.add('is_skipped', t.bool_node(node.is_skipped))
+	return obj
+}
+
+fn (t Tree) scope(scope ast.Scope) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Scope'))
+	obj.add('parent', t.string_node(ptr_str(scope.parent)))
+	children_arr := new_array()
+	for s in scope.children {
+		mut children_obj := new_object()
+		children_obj.add('parent', t.string_node(ptr_str(s.parent)))
+		children_obj.add('start_pos', t.number_node(s.start_pos))
+		children_obj.add('end_pos', t.number_node(s.end_pos))
+		children_arr.add_item(children_obj)
+	}
+	obj.add('children', children_arr)
+	obj.add('start_pos', t.number_node(scope.start_pos))
+	obj.add('end_pos', t.number_node(scope.end_pos))
+	obj.add('objects', t.objects(scope.objects))
+	obj.add('struct_fields', t.array_node_scope_struct_field(scope.struct_fields))
+	return obj
+}
+
+fn (t Tree) scope_struct_field(node ast.ScopeStructField) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ScopeStructField'))
+	obj.add('struct_type', t.type_node(node.struct_type))
+	obj.add('name', t.string_node(node.name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('orig_type', t.type_node(node.orig_type))
+	obj.add('pos', t.position(node.pos))
+	obj.add('smartcasts', t.array_node_type(node.smartcasts))
+	return obj
+}
+
+fn (t Tree) objects(so map[string]ast.ScopeObject) &Node {
+	mut obj := new_object()
+	for key, val in so {
+		obj.add(key, t.scope_object(val))
+	}
+	return obj
+}
+
+fn (t Tree) scope_object(node ast.ScopeObject) &Node {
+	mut obj := new_object()
+	match node {
+		ast.ConstField { t.const_field(node) }
+		ast.GlobalField { t.global_field(node) }
+		ast.Var { t.var(node) }
+		ast.AsmRegister { t.asm_register(node) }
+	}
+	return obj
+}
+
+fn (t Tree) imports(nodes []ast.Import) &Node {
+	mut import_array := new_array()
+	for node in nodes {
+		import_array.add_item(t.import_module(node))
+	}
+	return import_array
+}
+
+fn (t Tree) errors(errors []errors.Error) &Node {
+	mut errs := new_array()
+	for e in errors {
+		obj := new_object()
+		obj.add('message', t.string_node(e.message))
+		obj.add('file_path', t.string_node(e.file_path))
+		obj.add('pos', t.position(e.pos))
+		obj.add('backtrace', t.string_node(e.backtrace))
+		obj.add('reporter', t.enum_node(e.reporter))
+		errs.add_item(obj)
+	}
+	return errs
+}
+
+fn (t Tree) warnings(warnings []errors.Warning) &Node {
+	mut warns := new_array()
+	for w in warnings {
+		mut obj := new_object()
+		obj.add('message', t.string_node(w.message))
+		obj.add('file_path', t.string_node(w.file_path))
+		obj.add('pos', t.position(w.pos))
+		obj.add('reporter', t.enum_node(w.reporter))
+		warns.add_item(obj)
+	}
+	return warns
+}
+
+fn (t Tree) notices(notices []errors.Notice) &Node {
+	mut notice_array := new_array()
+	for n in notices {
+		mut obj := new_object()
+		obj.add('message', t.string_node(n.message))
+		obj.add('file_path', t.string_node(n.file_path))
+		obj.add('pos', t.position(n.pos))
+		obj.add('reporter', t.enum_node(n.reporter))
+		notice_array.add_item(obj)
+	}
+	return notice_array
+}
+
+// stmt array node
+fn (t Tree) stmts(stmts []ast.Stmt) &Node {
+	mut stmt_array := new_array()
+	for s in stmts {
+		stmt_array.add_item(t.stmt(s))
+	}
+	return stmt_array
+}
+
+fn (t Tree) stmt(node ast.Stmt) &Node {
+	match node {
+		ast.Module { return t.mod(node) }
+		ast.Import { return t.import_module(node) }
+		ast.ConstDecl { return t.const_decl(node) }
+		ast.FnDecl { return t.fn_decl(node) }
+		ast.StructDecl { return t.struct_decl(node) }
+		ast.EnumDecl { return t.enum_decl(node) }
+		ast.InterfaceDecl { return t.interface_decl(node) }
+		ast.HashStmt { return t.hash_stmt(node) }
+		ast.CompFor { return t.comp_for(node) }
+		ast.GlobalDecl { return t.global_decl(node) }
+		ast.DeferStmt { return t.defer_stmt(node) }
+		ast.TypeDecl { return t.type_decl(node) }
+		ast.GotoLabel { return t.goto_label(node) }
+		ast.GotoStmt { return t.goto_stmt(node) }
+		ast.AssignStmt { return t.assign_stmt(node) }
+		ast.Return { return t.return_(node) }
+		ast.ForCStmt { return t.for_c_stmt(node) }
+		ast.ForStmt { return t.for_stmt(node) }
+		ast.ForInStmt { return t.for_in_stmt(node) }
+		ast.BranchStmt { return t.branch_stmt(node) }
+		ast.AssertStmt { return t.assert_stmt(node) }
+		ast.ExprStmt { return t.expr_stmt(node) }
+		ast.Block { return t.block(node) }
+		ast.SqlStmt { return t.sql_stmt(node) }
+		ast.AsmStmt { return t.asm_stmt(node) }
+		ast.NodeError { return t.node_error(node) }
+		ast.EmptyStmt { return t.empty_stmt(node) }
+	}
+	return t.null_node()
+}
+
+fn (t Tree) import_module(node ast.Import) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Import'))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('alias', t.string_node(node.alias))
+	obj.add('syms', t.array_node_import_symbol(node.syms))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('next_comments', t.array_node_comment(node.next_comments))
+	obj.add('pos', t.position(node.pos))
+	obj.add('mod_pos', t.position(node.mod_pos))
+	obj.add('alias_pos', t.position(node.alias_pos))
+	obj.add('syms_pos', t.position(node.syms_pos))
+	return obj
+}
+
+fn (t Tree) import_symbol(node ast.ImportSymbol) &Node {
+	mut obj := new_object()
+	obj.add('name', t.string_node(node.name))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) position(p token.Position) &Node {
+	mut obj := new_object()
+	obj.add('line_nr', t.number_node(p.line_nr))
+	obj.add('last_line', t.number_node(p.last_line))
+	obj.add('pos', t.number_node(p.pos))
+	obj.add('len', t.number_node(p.len))
+	return obj
+}
+
+fn (t Tree) comment(node ast.Comment) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Comment'))
+	obj.add('text', t.string_node(node.text))
+	obj.add('is_multi', t.bool_node(node.is_multi))
+	obj.add('is_inline', t.bool_node(node.is_inline))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) const_decl(node ast.ConstDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ConstDecl'))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('is_block', t.bool_node(node.is_block))
+	obj.add('fields', t.array_node_const_field(node.fields))
+	obj.add('end_comments', t.array_node_comment(node.end_comments))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) const_field(node ast.ConstField) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ConstField'))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('name', t.string_node(node.name))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('comptime_expr_value', t.comptime_expr_value(node.comptime_expr_value))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) comptime_expr_value(node ast.ComptTimeConstValue) &Node {
+	match node {
+		ast.EmptyExpr {
+			return t.empty_expr(node)
+		}
+		string {
+			return t.string_node(node)
+		}
+		else {
+			return t.string_node(node.str())
+		}
+	}
+}
+
+// function declaration
+fn (t Tree) fn_decl(node ast.FnDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('FnDecl'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('is_deprecated', t.bool_node(node.is_deprecated))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('is_variadic', t.bool_node(node.is_variadic))
+	obj.add('is_anon', t.bool_node(node.is_anon))
+	obj.add('is_noreturn', t.bool_node(node.is_noreturn))
+	obj.add('is_manualfree', t.bool_node(node.is_manualfree))
+	obj.add('is_main', t.bool_node(node.is_main))
+	obj.add('is_test', t.bool_node(node.is_test))
+	obj.add('is_conditional', t.bool_node(node.is_conditional))
+	obj.add('is_exported', t.bool_node(node.is_exported))
+	obj.add('is_keep_alive', t.bool_node(node.is_keep_alive))
+	obj.add('receiver', t.struct_field(node.receiver))
+	obj.add('is_unsafe', t.bool_node(node.is_unsafe))
+	obj.add('receiver_pos', t.position(node.receiver_pos))
+	obj.add('is_method', t.bool_node(node.is_method))
+	obj.add('method_idx', t.number_node(node.method_idx))
+	obj.add('rec_mut', t.bool_node(node.rec_mut))
+	obj.add('rec_share', t.enum_node(node.rec_share))
+	obj.add('language', t.enum_node(node.language))
+	obj.add('file_mode', t.enum_node(node.file_mode))
+	obj.add('no_body', t.bool_node(node.no_body))
+	obj.add('is_builtin', t.bool_node(node.is_builtin))
+	obj.add('is_direct_arr', t.bool_node(node.is_direct_arr))
+	obj.add('ctdefine_idx', t.number_node(node.ctdefine_idx))
+	obj.add('pos', t.position(node.pos))
+	obj.add('body_pos', t.position(node.body_pos))
+	obj.add('return_type_pos', t.position(node.return_type_pos))
+	obj.add('file', t.string_node(node.file))
+	obj.add('has_return', t.bool_node(node.has_return))
+	obj.add('should_be_skipped', t.bool_node(node.should_be_skipped))
+	obj.add('return_type', t.type_node(node.return_type))
+	obj.add('source_file', t.number_node(int(node.source_file)))
+	obj.add('scope', t.number_node(int(node.scope)))
+	obj.add('attrs', t.array_node_attr(node.attrs))
+	obj.add('params', t.array_node_arg(node.params))
+	obj.add('generic_names', t.array_node_string(node.generic_names))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('next_comments', t.array_node_comment(node.next_comments))
+	obj.add('label_names', t.array_node_string(node.label_names))
+	obj.add('defer_stmts', t.array_node_defer_stmt(node.defer_stmts))
+	return obj
+}
+
+fn (t Tree) anon_fn(node ast.AnonFn) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AnonFn'))
+	obj.add('decl', t.fn_decl(node.decl))
+	obj.add('inherited_vars', t.array_node_arg(node.inherited_vars))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('has_gen', t.bool_node(node.has_gen))
+	return obj
+}
+
+fn (t Tree) struct_decl(node ast.StructDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('StructDecl'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('pub_pos', t.number_node(node.pub_pos))
+	obj.add('mut_pos', t.number_node(node.mut_pos))
+	obj.add('pub_mut_pos', t.number_node(node.pub_mut_pos))
+	obj.add('global_pos', t.number_node(node.global_pos))
+	obj.add('module_pos', t.number_node(node.module_pos))
+	obj.add('language', t.enum_node(node.language))
+	obj.add('is_union', t.bool_node(node.is_union))
+	obj.add('pos', t.position(node.pos))
+	obj.add('fields', t.array_node_struct_field(node.fields))
+	obj.add('generic_types', t.array_node_type(node.generic_types))
+	obj.add('attrs', t.array_node_attr(node.attrs))
+	obj.add('end_comments', t.array_node_comment(node.end_comments))
+	obj.add('embeds', t.array_node_embed(node.embeds))
+	return obj
+}
+
+fn (t Tree) struct_field(node ast.StructField) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('StructField'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('type_pos', t.position(node.type_pos))
+	obj.add('has_default_expr', t.bool_node(node.has_default_expr))
+	obj.add('default_expr_typ', t.type_node(node.default_expr_typ))
+	obj.add('default_expr', t.expr(node.default_expr))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('is_mut', t.bool_node(node.is_mut))
+	obj.add('is_global', t.bool_node(node.is_global))
+	obj.add('attrs', t.array_node_attr(node.attrs))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) embed(node ast.Embed) &Node {
+	mut obj := new_object()
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('pos', t.position(node.pos))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+fn (t Tree) enum_decl(node ast.EnumDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('EnumDecl'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('is_flag', t.bool_node(node.is_flag))
+	obj.add('is_multi_allowed', t.bool_node(node.is_multi_allowed))
+	obj.add('pos', t.position(node.pos))
+	obj.add('fields', t.array_node_enum_field(node.fields))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('attrs', t.array_node_attr(node.attrs))
+	return obj
+}
+
+fn (t Tree) enum_field(node ast.EnumField) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('EnumField'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('has_expr', t.bool_node(node.has_expr))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('pos', t.position(node.pos))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('next_comments', t.array_node_comment(node.next_comments))
+	return obj
+}
+
+fn (t Tree) interface_decl(node ast.InterfaceDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('InterfaceDecl'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('mut_pos', t.number_node(node.mut_pos))
+	obj.add('field_names', t.array_node_string(node.field_names))
+	obj.add('methods', t.array_node_fn_decl(node.methods))
+	obj.add('fields', t.array_node_struct_field(node.fields))
+	obj.add('pre_comments', t.array_node_comment(node.pre_comments))
+	obj.add('name_pos', t.position(node.name_pos))
+	obj.add('language', t.enum_node(node.language))
+	obj.add('pos', t.position(node.pos))
+	obj.add('are_ifaces_expanded', t.bool_node(node.are_ifaces_expanded))
+	obj.add('ifaces', t.array_node_interface_embedding(node.ifaces))
+	return obj
+}
+
+fn (t Tree) interface_embedding(node ast.InterfaceEmbedding) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('InterfaceEmbedding'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('pos', t.position(node.pos))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+fn (t Tree) attr(node ast.Attr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Attr'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('has_arg', t.bool_node(node.has_arg))
+	obj.add('kind', t.enum_node(node.kind))
+	obj.add('ct_expr', t.expr(node.ct_expr))
+	obj.add('ct_opt', t.bool_node(node.ct_opt))
+	obj.add('ct_evaled', t.bool_node(node.ct_evaled))
+	obj.add('ct_skip', t.bool_node(node.ct_skip))
+	obj.add('arg', t.string_node(node.arg))
+	return obj
+}
+
+fn (t Tree) hash_stmt(node ast.HashStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('HashStmt'))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('val', t.string_node(node.val))
+	obj.add('kind', t.string_node(node.kind))
+	obj.add('main', t.string_node(node.main))
+	obj.add('msg', t.string_node(node.msg))
+	obj.add('ct_conds', t.array_node_expr(node.ct_conds))
+	obj.add('source_file', t.string_node(node.source_file))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) comp_for(node ast.CompFor) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('CompFor'))
+	obj.add('val_var', t.string_node(node.val_var))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('kind', t.enum_node(node.kind))
+	obj.add('pos', t.position(node.pos))
+	obj.add('typ_pos', t.position(node.pos))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	return obj
+}
+
+fn (t Tree) global_decl(node ast.GlobalDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('GlobalDecl'))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('pos', t.position(node.pos))
+	obj.add('is_block', t.bool_node(node.is_block))
+	obj.add('fields', t.array_node_global_field(node.fields))
+	obj.add('end_comments', t.array_node_comment(node.end_comments))
+	return obj
+}
+
+fn (t Tree) global_field(node ast.GlobalField) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('GlobalField'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('has_expr', t.bool_node(node.has_expr))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('pos', t.position(node.pos))
+	obj.add('typ_pos', t.position(node.typ_pos))
+	return obj
+}
+
+fn (t Tree) defer_stmt(node ast.DeferStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('DeferStmt'))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	obj.add('defer_vars', t.array_node_ident(node.defer_vars))
+	obj.add('ifdef', t.string_node(node.ifdef))
+	obj.add('idx_in_fn', t.number_node(node.idx_in_fn))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) type_decl(node ast.TypeDecl) &Node {
+	match node {
+		ast.AliasTypeDecl { return t.alias_type_decl(node) }
+		ast.FnTypeDecl { return t.fn_type_decl(node) }
+		ast.SumTypeDecl { return t.sum_type_decl(node) }
+	}
+}
+
+fn (t Tree) alias_type_decl(node ast.AliasTypeDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AliasTypeDecl'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('parent_type', t.type_node(node.parent_type))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) sum_type_decl(node ast.SumTypeDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SumTypeDecl'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('pos', t.position(node.pos))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('generic_types', t.array_node_type(node.generic_types))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('variants', t.array_node_type_expr(node.variants))
+	return obj
+}
+
+fn (t Tree) fn_type_decl(node ast.FnTypeDecl) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('FnTypeDecl'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('is_pub', t.bool_node(node.is_pub))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('pos', t.position(node.pos))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+fn (t Tree) arg(node ast.Param) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Param'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('is_mut', t.bool_node(node.is_mut))
+	return obj
+}
+
+fn (t Tree) goto_label(node ast.GotoLabel) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('GotoLabel'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) goto_stmt(node ast.GotoStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('GotoStmt'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) assign_stmt(node ast.AssignStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AssignStmt'))
+	obj.add('left', t.array_node_expr(node.left))
+	obj.add('left_types', t.array_node_type(node.left_types))
+	obj.add('right', t.array_node_expr(node.right))
+	obj.add('right_types', t.array_node_type(node.left_types))
+	obj.add('op', t.token_node(node.op))
+	obj.add('is_static', t.bool_node(node.is_static))
+	obj.add('is_simple', t.bool_node(node.is_simple))
+	obj.add('has_cross_var', t.bool_node(node.has_cross_var))
+	obj.add('pos', t.position(node.pos))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('end_comments', t.array_node_comment(node.end_comments))
+	return obj
+}
+
+fn (t Tree) var(node ast.Var) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Var'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('orig_type', t.type_node(node.orig_type))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('is_arg', t.bool_node(node.is_arg))
+	obj.add('is_mut', t.bool_node(node.is_mut))
+	obj.add('is_used', t.bool_node(node.is_used))
+	obj.add('is_changed', t.bool_node(node.is_changed))
+	obj.add('is_or', t.bool_node(node.is_or))
+	obj.add('is_tmp', t.bool_node(node.is_tmp))
+	obj.add('is_autofree_tmp', t.bool_node(node.is_autofree_tmp))
+	obj.add('is_auto_deref', t.bool_node(node.is_auto_deref))
+	obj.add('is_inherited', t.bool_node(node.is_inherited))
+	obj.add('is_auto_heap', t.bool_node(node.is_auto_heap))
+	obj.add('is_stack_obj', t.bool_node(node.is_stack_obj))
+	obj.add('share', t.enum_node(node.share))
+	obj.add('pos', t.position(node.pos))
+	obj.add('smartcasts', t.array_node_type(node.smartcasts))
+	return obj
+}
+
+fn (t Tree) return_(node ast.Return) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Return'))
+	obj.add('exprs', t.array_node_expr(node.exprs))
+	obj.add('types', t.array_node_type(node.types))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) for_c_stmt(node ast.ForCStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ForCStmt'))
+	obj.add('init', t.stmt(node.init))
+	obj.add('has_init', t.bool_node(node.has_init))
+	obj.add('cond', t.expr(node.cond))
+	obj.add('has_cond', t.bool_node(node.has_cond))
+	obj.add('inc', t.stmt(node.inc))
+	obj.add('has_inc', t.bool_node(node.has_inc))
+	obj.add('is_multi', t.bool_node(node.is_multi))
+	obj.add('label', t.string_node(node.label))
+	obj.add('pos', t.position(node.pos))
+	obj.add('scope', t.number_node(int(node.scope)))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	return obj
+}
+
+fn (t Tree) for_stmt(node ast.ForStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ForStmt'))
+	obj.add('cond', t.expr(node.cond))
+	obj.add('is_inf', t.bool_node(node.is_inf))
+	obj.add('label', t.string_node(node.label))
+	obj.add('pos', t.position(node.pos))
+	obj.add('scope', t.number_node(int(node.scope)))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	return obj
+}
+
+fn (t Tree) for_in_stmt(node ast.ForInStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ForInStmt'))
+	obj.add('key_var', t.string_node(node.key_var))
+	obj.add('val_var', t.string_node(node.val_var))
+	obj.add('cond', t.expr(node.cond))
+	obj.add('is_range', t.bool_node(node.is_range))
+	obj.add('high', t.expr(node.high))
+	obj.add('key_type', t.type_node(node.key_type))
+	obj.add('val_type', t.type_node(node.val_type))
+	obj.add('cond_type', t.type_node(node.cond_type))
+	obj.add('kind', t.enum_node(node.kind))
+	obj.add('val_is_mut', t.bool_node(node.val_is_mut))
+	obj.add('label', t.string_node(node.label))
+	obj.add('pos', t.position(node.pos))
+	obj.add('scope', t.number_node(int(node.scope)))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	return obj
+}
+
+fn (t Tree) branch_stmt(node ast.BranchStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('BranchStmt'))
+	obj.add('kind', t.token_node(node.kind))
+	obj.add('label', t.string_node(node.label))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) assert_stmt(node ast.AssertStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AssertStmt'))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('is_used', t.bool_node(node.is_used))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) block(node ast.Block) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Block'))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	obj.add('is_unsafe', t.bool_node(node.is_unsafe))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) comptime_call(node ast.ComptimeCall) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ComptimeCall'))
+	obj.add('method_name', t.string_node(node.method_name))
+	obj.add('left', t.expr(node.left))
+	obj.add('is_vweb', t.bool_node(node.is_vweb))
+	obj.add('vweb_tmpl', t.string_node(node.vweb_tmpl.path))
+	obj.add('args_var', t.string_node(node.args_var))
+	obj.add('sym', t.string_node(node.sym.name))
+	obj.add('has_parens', t.bool_node(node.has_parens))
+	obj.add('is_embed', t.bool_node(node.is_embed))
+	obj.add('embed_file', t.embed_file(node.embed_file))
+	obj.add('method_pos', t.position(node.method_pos))
+	obj.add('result_type', t.type_node(node.result_type))
+	obj.add('scope', t.scope(node.scope))
+	obj.add('env_value', t.string_node(node.env_value))
+	obj.add('pos', t.position(node.pos))
+	obj.add('args', t.array_node_call_arg(node.args))
+	return obj
+}
+
+fn (t Tree) comptime_selector(node ast.ComptimeSelector) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ComptimeSelector'))
+	obj.add('has_parens', t.bool_node(node.has_parens))
+	obj.add('left', t.expr(node.left))
+	obj.add('field_expr', t.expr(node.field_expr))
+	obj.add('left_type', t.type_node(node.left_type))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) expr_stmt(node ast.ExprStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ExprStmt'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('is_expr', t.bool_node(node.is_expr))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('pos', t.position(node.pos))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+// expr
+fn (t Tree) expr(expr ast.Expr) &Node {
+	match expr {
+		ast.IntegerLiteral {
+			return t.integer_literal(expr)
+		}
+		ast.FloatLiteral {
+			return t.float_literal(expr)
+		}
+		ast.StringLiteral {
+			return t.string_literal(expr)
+		}
+		ast.CharLiteral {
+			return t.char_literal(expr)
+		}
+		ast.BoolLiteral {
+			return t.bool_literal(expr)
+		}
+		ast.StringInterLiteral {
+			return t.string_inter_literal(expr)
+		}
+		ast.EnumVal {
+			return t.enum_val(expr)
+		}
+		ast.Assoc {
+			return t.assoc(expr)
+		}
+		ast.AtExpr {
+			return t.at_expr(expr)
+		}
+		ast.CastExpr {
+			return t.cast_expr(expr)
+		}
+		ast.AsCast {
+			return t.as_cast(expr)
+		}
+		ast.TypeNode {
+			return t.type_expr(expr)
+		}
+		ast.SizeOf {
+			return t.size_of(expr)
+		}
+		ast.IsRefType {
+			return t.is_ref_type(expr)
+		}
+		ast.PrefixExpr {
+			return t.prefix_expr(expr)
+		}
+		ast.InfixExpr {
+			return t.infix_expr(expr)
+		}
+		ast.IndexExpr {
+			return t.index_expr(expr)
+		}
+		ast.PostfixExpr {
+			return t.postfix_expr(expr)
+		}
+		ast.SelectorExpr {
+			return t.selector_expr(expr)
+		}
+		ast.RangeExpr {
+			return t.range_expr(expr)
+		}
+		ast.IfExpr {
+			return t.if_expr(expr)
+		}
+		ast.Ident {
+			return t.ident(expr)
+		}
+		ast.CallExpr {
+			return t.call_expr(expr)
+		}
+		ast.OrExpr {
+			return t.or_expr(expr)
+		}
+		ast.StructInit {
+			return t.struct_init(expr)
+		}
+		ast.ArrayInit {
+			return t.array_init(expr)
+		}
+		ast.MapInit {
+			return t.map_init(expr)
+		}
+		ast.None {
+			return t.none_expr(expr)
+		}
+		ast.ParExpr {
+			return t.par_expr(expr)
+		}
+		ast.IfGuardExpr {
+			return t.if_guard_expr(expr)
+		}
+		ast.MatchExpr {
+			return t.match_expr(expr)
+		}
+		ast.ConcatExpr {
+			return t.concat_expr(expr)
+		}
+		ast.TypeOf {
+			return t.type_of(expr)
+		}
+		ast.Likely {
+			return t.likely(expr)
+		}
+		ast.SqlExpr {
+			return t.sql_expr(expr)
+		}
+		ast.ComptimeCall {
+			return t.comptime_call(expr)
+		}
+		ast.ComptimeSelector {
+			return t.comptime_selector(expr)
+		}
+		ast.LockExpr {
+			return t.lock_expr(expr)
+		}
+		ast.UnsafeExpr {
+			return t.unsafe_expr(expr)
+		}
+		ast.ChanInit {
+			return t.chan_init(expr)
+		}
+		ast.SelectExpr {
+			return t.select_expr(expr)
+		}
+		ast.Comment {
+			return t.comment(expr)
+		}
+		ast.AnonFn {
+			return t.anon_fn(expr)
+		}
+		ast.ArrayDecompose {
+			return t.array_decompose(expr)
+		}
+		ast.GoExpr {
+			return t.go_expr(expr)
+		}
+		ast.OffsetOf {
+			return t.offset_of(expr)
+		}
+		ast.DumpExpr {
+			return t.dump_expr(expr)
+		}
+		ast.NodeError {
+			return t.node_error(expr)
+		}
+		ast.EmptyExpr {
+			return t.empty_expr(expr)
+		}
+		else {
+			// println('unknown expr')
+			return t.null_node()
+		}
+	}
+}
+
+fn (t Tree) integer_literal(node ast.IntegerLiteral) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IntegerLiteral'))
+	obj.add('val', t.string_node(node.val))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) float_literal(node ast.FloatLiteral) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('FloatLiteral'))
+	obj.add('val', t.string_node(node.val))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) string_literal(node ast.StringLiteral) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('StringLiteral'))
+	obj.add('val', t.string_node(node.val))
+	obj.add('is_raw', t.bool_node(node.is_raw))
+	obj.add('language', t.enum_node(node.language))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) char_literal(node ast.CharLiteral) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('CharLiteral'))
+	obj.add('val', t.string_node(node.val))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) bool_literal(node ast.BoolLiteral) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('BoolLiteral'))
+	obj.add('val', t.bool_node(node.val))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) string_inter_literal(node ast.StringInterLiteral) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('StringInterLiteral'))
+	obj.add('vals', t.array_node_string(node.vals))
+	obj.add('exprs', t.array_node_expr(node.exprs))
+	obj.add('expr_types', t.array_node_type(node.expr_types))
+	obj.add('fwidths', t.array_node_int(node.fwidths))
+	obj.add('precisions', t.array_node_int(node.precisions))
+	obj.add('pluss', t.array_node_bool(node.pluss))
+	obj.add('fills', t.array_node_bool(node.fills))
+	obj.add('fmt_poss', t.array_node_position(node.fmt_poss))
+	obj.add('fmts', t.array_node_byte(node.fmts))
+	obj.add('need_fmts', t.array_node_bool(node.need_fmts))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) enum_val(node ast.EnumVal) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('EnumVal'))
+	obj.add('enum_name', t.string_node(node.enum_name))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('val', t.string_node(node.val))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) assoc(node ast.Assoc) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Assoc'))
+	obj.add('var_name', t.string_node(node.var_name))
+	obj.add('fields', t.array_node_string(node.fields))
+	obj.add('exprs', t.array_node_expr(node.exprs))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('pos', t.position(node.pos))
+	obj.add('scope', t.number_node(int(node.scope)))
+	return obj
+}
+
+fn (t Tree) at_expr(node ast.AtExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AtExpr'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('pos', t.position(node.pos))
+	obj.add('kind', t.enum_node(node.kind))
+	obj.add('val', t.string_node(node.val))
+	return obj
+}
+
+fn (t Tree) cast_expr(node ast.CastExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('CastExpr'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('ityp', t.number_node(int(node.typ)))
+	obj.add('typname', t.string_node(node.typname))
+	obj.add('has_arg', t.bool_node(node.has_arg))
+	obj.add('arg', t.expr(node.arg))
+	obj.add('expr_type', t.type_node(node.expr_type))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) as_cast(node ast.AsCast) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsCast'))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('expr_type', t.type_node(node.expr_type))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) type_expr(node ast.TypeNode) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('TypeNode'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) size_of(node ast.SizeOf) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SizeOf'))
+	obj.add('is_type', t.bool_node(node.is_type))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) is_ref_type(node ast.IsRefType) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IsRefType'))
+	obj.add('is_type', t.bool_node(node.is_type))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) prefix_expr(node ast.PrefixExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('PrefixExpr'))
+	obj.add('op', t.token_node(node.op))
+	obj.add('right', t.expr(node.right))
+	obj.add('right_type', t.type_node(node.right_type))
+	obj.add('or_block', t.or_expr(node.or_block))
+	obj.add('is_option', t.bool_node(node.is_option))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) infix_expr(node ast.InfixExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('InfixExpr'))
+	obj.add('op', t.token_node(node.op))
+	obj.add('left', t.expr(node.left))
+	obj.add('left_type', t.type_node(node.left_type))
+	obj.add('right', t.expr(node.right))
+	obj.add('right_type', t.type_node(node.right_type))
+	obj.add('auto_locked', t.string_node(node.auto_locked))
+	obj.add('or_block', t.or_expr(node.or_block))
+	obj.add('is_stmt', t.bool_node(node.is_stmt))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) index_expr(node ast.IndexExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IndexExpr'))
+	obj.add('left', t.expr(node.left))
+	obj.add('left_type', t.type_node(node.left_type))
+	obj.add('index', t.expr(node.index))
+	obj.add('is_setter', t.bool_node(node.is_setter))
+	obj.add('or_expr', t.or_expr(node.or_expr))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) postfix_expr(node ast.PostfixExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('PostfixExpr'))
+	obj.add('op', t.token_node(node.op))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('auto_locked', t.string_node(node.auto_locked))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) selector_expr(node ast.SelectorExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SelectorExpr'))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('expr_type', t.type_node(node.expr_type))
+	obj.add('field_name', t.string_node(node.field_name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('name_type', t.type_node(node.name_type))
+	obj.add('gkind_field', t.enum_node(node.gkind_field))
+	obj.add('from_embed_type', t.type_node(node.from_embed_type))
+	obj.add('next_token', t.token_node(node.next_token))
+	obj.add('pos', t.position(node.pos))
+	obj.add('scope', t.number_node(int(node.scope)))
+	return obj
+}
+
+fn (t Tree) range_expr(node ast.RangeExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('RangeExpr'))
+	obj.add('low', t.expr(node.low))
+	obj.add('high', t.expr(node.high))
+	obj.add('has_high', t.bool_node(node.has_high))
+	obj.add('has_low', t.bool_node(node.has_low))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) if_expr(node ast.IfExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IfExpr'))
+	obj.add('is_comptime', t.bool_node(node.is_comptime))
+	obj.add('tok_kind', t.token_node(node.tok_kind))
+	obj.add('branches', t.array_node_if_branch(node.branches))
+	obj.add('left', t.expr(node.left))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('has_else', t.bool_node(node.has_else))
+	obj.add('is_expr', t.bool_node(node.is_expr))
+	obj.add('pos', t.position(node.pos))
+	obj.add('post_comments', t.array_node_comment(node.post_comments))
+	return obj
+}
+
+fn (t Tree) if_branch(node ast.IfBranch) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IfBranch'))
+	obj.add('cond', t.expr(node.cond))
+	obj.add('pos', t.position(node.pos))
+	obj.add('body_pos', t.position(node.body_pos))
+	obj.add('pkg_exist', t.bool_node(node.pkg_exist))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	obj.add('scope', t.number_node(int(node.scope)))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+fn (t Tree) ident(node ast.Ident) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Ident'))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('name', t.string_node(node.name))
+	obj.add('language', t.enum_node(node.language))
+	obj.add('is_mut', t.bool_node(node.is_mut))
+	obj.add('comptime', t.bool_node(node.comptime))
+	obj.add('tok_kind', t.token_node(node.tok_kind))
+	obj.add('kind', t.enum_node(node.kind))
+	obj.add('info', t.ident_info(node.info))
+	obj.add('pos', t.position(node.pos))
+	obj.add('mut_pos', t.position(node.mut_pos))
+	obj.add('obj', t.scope_object(node.obj))
+	obj.add('scope', t.number_node(int(node.scope)))
+	return obj
+}
+
+fn (t Tree) ident_info(node ast.IdentInfo) &Node {
+	match node {
+		ast.IdentVar { return t.ident_var(node) }
+		ast.IdentFn { return t.ident_fn(node) }
+	}
+}
+
+fn (t Tree) ident_var(node ast.IdentVar) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IdentVar'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('is_mut', t.bool_node(node.is_mut))
+	obj.add('is_static', t.bool_node(node.is_static))
+	obj.add('is_optional', t.bool_node(node.is_optional))
+	obj.add('share', t.enum_node(node.share))
+	return obj
+}
+
+fn (t Tree) ident_fn(node ast.IdentFn) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IdentFn'))
+	obj.add('typ', t.type_node(node.typ))
+	return obj
+}
+
+fn (t Tree) call_expr(node ast.CallExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('CallExpr'))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('name', t.string_node(node.name))
+	obj.add('language', t.enum_node(node.language))
+	obj.add('left_type', t.type_node(node.left_type))
+	obj.add('receiver_type', t.type_node(node.receiver_type))
+	obj.add('return_type', t.type_node(node.return_type))
+	obj.add('left', t.expr(node.left))
+	obj.add('is_method', t.bool_node(node.is_method))
+	obj.add('is_keep_alive', t.bool_node(node.is_keep_alive))
+	obj.add('is_noreturn', t.bool_node(node.is_noreturn))
+	obj.add('should_be_skipped', t.bool_node(node.should_be_skipped))
+	obj.add('free_receiver', t.bool_node(node.free_receiver))
+	obj.add('scope', t.number_node(int(node.scope)))
+	obj.add('args', t.array_node_call_arg(node.args))
+	obj.add('expected_arg_types', t.array_node_type(node.expected_arg_types))
+	obj.add('concrete_types', t.array_node_type(node.concrete_types))
+	obj.add('or_block', t.or_expr(node.or_block))
+	obj.add('concrete_list_pos', t.position(node.concrete_list_pos))
+	obj.add('from_embed_type', t.type_node(node.from_embed_type))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('pos', t.position(node.pos))
+	obj.add('name_pos', t.position(node.name_pos))
+	return obj
+}
+
+fn (t Tree) call_arg(node ast.CallArg) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('CallArg'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('is_mut', t.bool_node(node.is_mut))
+	obj.add('share', t.enum_node(node.share))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('is_tmp_autofree', t.bool_node(node.is_tmp_autofree))
+	obj.add('pos', t.position(node.pos))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+fn (t Tree) or_expr(node ast.OrExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('OrExpr'))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	obj.add('kind', t.enum_node(node.kind))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) struct_init(node ast.StructInit) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('StructInit'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('is_short', t.bool_node(node.is_short))
+	obj.add('unresolved', t.bool_node(node.unresolved))
+	obj.add('has_update_expr', t.bool_node(node.has_update_expr))
+	obj.add('update_expr', t.expr(node.update_expr))
+	obj.add('update_expr_type', t.type_node(node.update_expr_type))
+	obj.add('pos', t.position(node.pos))
+	obj.add('name_pos', t.position(node.name_pos))
+	obj.add('update_expr_comments', t.array_node_comment(node.update_expr_comments))
+	obj.add('fields', t.array_node_struct_init_field(node.fields))
+	obj.add('embeds', t.array_node_struct_init_embed(node.embeds))
+	obj.add('pre_comments', t.array_node_comment(node.pre_comments))
+	return obj
+}
+
+fn (t Tree) struct_init_field(node ast.StructInitField) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('StructInitField'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('expected_type', t.type_node(node.expected_type))
+	obj.add('parent_type', t.type_node(node.parent_type))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('next_comments', t.array_node_comment(node.next_comments))
+	obj.add('pos', t.position(node.pos))
+	obj.add('name_pos', t.position(node.name_pos))
+	return obj
+}
+
+fn (t Tree) struct_init_embed(node ast.StructInitEmbed) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('StructInitEmbed'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('expected_type', t.type_node(node.expected_type))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('next_comments', t.array_node_comment(node.next_comments))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) array_init(node ast.ArrayInit) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ArrayInit'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('elem_type', t.type_node(node.elem_type))
+	obj.add('exprs', t.array_node_expr(node.exprs))
+	obj.add('ecmnts', t.two_dimension_comment(node.ecmnts))
+	obj.add('pre_cmnts', t.array_node_comment(node.pre_cmnts))
+	obj.add('elem_type_pos', t.position(node.elem_type_pos))
+	obj.add('is_fixed', t.bool_node(node.is_fixed))
+	obj.add('has_val', t.bool_node(node.has_val))
+	obj.add('mod', t.string_node(node.mod))
+	obj.add('len_expr', t.expr(node.len_expr))
+	obj.add('cap_expr', t.expr(node.cap_expr))
+	obj.add('default_expr', t.expr(node.default_expr))
+	obj.add('has_len', t.bool_node(node.has_len))
+	obj.add('has_cap', t.bool_node(node.has_cap))
+	obj.add('has_default', t.bool_node(node.has_default))
+	obj.add('expr_types', t.array_node_type(node.expr_types))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) map_init(node ast.MapInit) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('MapInit'))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('key_type', t.type_node(node.key_type))
+	obj.add('value_type', t.type_node(node.value_type))
+	obj.add('keys', t.array_node_expr(node.keys))
+	obj.add('vals', t.array_node_expr(node.vals))
+	obj.add('comments', t.two_dimension_comment(node.comments))
+	obj.add('pre_cmnts', t.array_node_comment(node.pre_cmnts))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) none_expr(node ast.None) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('None'))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) par_expr(node ast.ParExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ParExpr'))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) if_guard_expr(node ast.IfGuardExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('IfGuardExpr'))
+	obj.add('var_name', t.string_node(node.var_name))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('expr_type', t.type_node(node.expr_type))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) match_expr(node ast.MatchExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('MatchExpr'))
+	obj.add('tok_kind', t.token_node(node.tok_kind))
+	obj.add('cond', t.expr(node.cond))
+	obj.add('cond_type', t.type_node(node.cond_type))
+	obj.add('return_type', t.type_node(node.return_type))
+	obj.add('expected_type', t.type_node(node.expected_type))
+	obj.add('is_sum_type', t.bool_node(node.is_sum_type))
+	obj.add('is_expr', t.bool_node(node.is_expr))
+	obj.add('pos', t.position(node.pos))
+	obj.add('branches', t.array_node_match_branch(node.branches))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+fn (t Tree) match_branch(node ast.MatchBranch) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('MatchBranch'))
+	obj.add('ecmnts', t.two_dimension_comment(node.ecmnts))
+	obj.add('stmts', t.array_node_stmt(node.stmts))
+	obj.add('is_else', t.bool_node(node.is_else))
+	obj.add('pos', t.position(node.pos))
+	obj.add('post_comments', t.array_node_comment(node.post_comments))
+	obj.add('branch_pos', t.position(node.branch_pos))
+	obj.add('exprs', t.array_node_expr(node.exprs))
+	obj.add('scope', t.number_node(int(node.scope)))
+	return obj
+}
+
+fn (t Tree) concat_expr(node ast.ConcatExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ConcatExpr'))
+	obj.add('vals', t.array_node_expr(node.vals))
+	obj.add('return_type', t.type_node(node.return_type))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) type_of(node ast.TypeOf) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('TypeOf'))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('expr_type', t.type_node(node.expr_type))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) likely(node ast.Likely) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('Likely'))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('is_likely', t.bool_node(node.is_likely))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) sql_expr(node ast.SqlExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SqlExpr'))
+	obj.add('type', t.type_node(node.typ))
+	obj.add('is_count', t.bool_node(node.is_count))
+	obj.add('db_expr', t.expr(node.db_expr))
+	obj.add('table_expr', t.type_expr(node.table_expr))
+	obj.add('has_where', t.bool_node(node.has_where))
+	obj.add('where_expr', t.expr(node.where_expr))
+	obj.add('has_order', t.bool_node(node.has_order))
+	obj.add('order_expr', t.expr(node.order_expr))
+	obj.add('has_desc', t.bool_node(node.has_desc))
+	obj.add('is_array', t.bool_node(node.is_array))
+	obj.add('pos', t.position(node.pos))
+	obj.add('has_limit', t.bool_node(node.has_limit))
+	obj.add('limit_expr', t.expr(node.limit_expr))
+	obj.add('has_offset', t.bool_node(node.has_offset))
+	obj.add('offset_expr', t.expr(node.offset_expr))
+	obj.add('fields', t.array_node_struct_field(node.fields))
+	sub_struct_map := new_object()
+	for key, val in node.sub_structs {
+		sub_struct_map.add(key.str(), t.sql_expr(val))
+	}
+	obj.add('sub_structs', sub_struct_map)
+	return obj
+}
+
+fn (t Tree) sql_stmt(node ast.SqlStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SqlStmt'))
+	obj.add('db_expr', t.expr(node.db_expr))
+	obj.add('pos', t.position(node.pos))
+	obj.add('lines', t.array_node_sql_stmt_line(node.lines))
+	return obj
+}
+
+fn (t Tree) sql_stmt_line(node ast.SqlStmtLine) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SqlStmtLine'))
+	obj.add('kind', t.enum_node(node.kind))
+	obj.add('table_expr', t.type_expr(node.table_expr))
+	obj.add('object_var_name', t.string_node(node.object_var_name))
+	obj.add('where_expr', t.expr(node.where_expr))
+	obj.add('fields', t.array_node_struct_field(node.fields))
+	obj.add('updated_columns', t.array_node_string(node.updated_columns))
+	obj.add('update_exprs', t.array_node_expr(node.update_exprs))
+	obj.add('pos', t.position(node.pos))
+
+	sub_struct_map := new_object()
+	for key, val in node.sub_structs {
+		sub_struct_map.add(key.str(), t.sql_stmt_line(val))
+	}
+	obj.add('sub_structs', sub_struct_map)
+	return obj
+}
+
+fn (t Tree) lock_expr(expr ast.LockExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('LockExpr'))
+	obj.add('is_expr', t.bool_node(expr.is_expr))
+	obj.add('typ', t.type_node(expr.typ))
+	obj.add('pos', t.position(expr.pos))
+	obj.add('stmts', t.array_node_stmt(expr.stmts))
+	obj.add('lockeds', t.array_node_expr(expr.lockeds))
+	obj.add('r_lock', t.array_node_bool(expr.is_rlock))
+	return obj
+}
+
+fn (t Tree) unsafe_expr(expr ast.UnsafeExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('UnsafeExpr'))
+	obj.add('expr', t.expr(expr.expr))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) chan_init(expr ast.ChanInit) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ChanInit'))
+	obj.add('has_cap', t.bool_node(expr.has_cap))
+	obj.add('cap_expr', t.expr(expr.cap_expr))
+	obj.add('typ', t.type_node(expr.typ))
+	obj.add('elem_type', t.type_node(expr.elem_type))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) select_expr(expr ast.SelectExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SelectExpr'))
+	obj.add('branches', t.array_node_select_branch(expr.branches))
+	obj.add('is_expr', t.bool_node(expr.is_expr))
+	obj.add('has_exception', t.bool_node(expr.has_exception))
+	obj.add('expected_type', t.type_node(expr.expected_type))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) select_branch(expr ast.SelectBranch) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('SelectBranch'))
+	obj.add('stmt', t.stmt(expr.stmt))
+	obj.add('stmts', t.array_node_stmt(expr.stmts))
+	obj.add('pos', t.position(expr.pos))
+	obj.add('comment', t.comment(expr.comment))
+	obj.add('is_else', t.bool_node(expr.is_else))
+	obj.add('is_timeout', t.bool_node(expr.is_timeout))
+	obj.add('post_comments', t.array_node_comment(expr.post_comments))
+	return obj
+}
+
+fn (t Tree) array_decompose(expr ast.ArrayDecompose) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('ArrayDecompose'))
+	obj.add('expr', t.expr(expr.expr))
+	obj.add('expr_type', t.type_node(expr.expr_type))
+	obj.add('arg_type', t.type_node(expr.arg_type))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) go_expr(expr ast.GoExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('GoExpr'))
+	obj.add('call_expr', t.call_expr(expr.call_expr))
+	obj.add('is_expr', t.bool_node(expr.is_expr))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) offset_of(expr ast.OffsetOf) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('OffsetOf'))
+	obj.add('struct_type', t.type_node(expr.struct_type))
+	obj.add('field', t.string_node('field'))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) dump_expr(expr ast.DumpExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('DumpExpr'))
+	obj.add('expr', t.expr(expr.expr))
+	obj.add('expr_type', t.type_node(expr.expr_type))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) node_error(expr ast.NodeError) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('NodeError'))
+	obj.add('idx', t.number_node(expr.idx))
+	obj.add('pos', t.position(expr.pos))
+	return obj
+}
+
+fn (t Tree) empty_expr(expr ast.EmptyExpr) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('EmptyExpr'))
+	// obj.add('x', t.number_node(expr.x))
+	return obj
+}
+
+fn (t Tree) empty_stmt(node ast.EmptyStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('EmptyStmt'))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) asm_stmt(node ast.AsmStmt) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmStmt'))
+	obj.add('arch', t.enum_node(node.arch))
+	obj.add('is_basic', t.bool_node(node.is_basic))
+	obj.add('is_volatile', t.bool_node(node.is_volatile))
+	obj.add('is_goto', t.bool_node(node.is_goto))
+	obj.add('scope', t.scope(node.scope))
+	// obj.add('scope', t.number_node(int(node.scope)))
+	obj.add('pos', t.position(node.pos))
+	obj.add('clobbered', t.array_node_asm_clobbered(node.clobbered))
+	obj.add('templates', t.array_node_asm_template(node.templates))
+	obj.add('output', t.array_node_asm_io(node.output))
+	obj.add('input', t.array_node_asm_io(node.input))
+	obj.add('global_labels', t.array_node_string(node.global_labels))
+	obj.add('local_labels', t.array_node_string(node.local_labels))
+	return obj
+}
+
+fn (t Tree) asm_register(node ast.AsmRegister) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmRegister'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('size', t.number_node(node.size))
+	return obj
+}
+
+fn (t Tree) asm_template(node ast.AsmTemplate) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmTemplate'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('is_label', t.bool_node(node.is_label))
+	obj.add('is_directive', t.bool_node(node.is_directive))
+	obj.add('args', t.array_node_asm_arg(node.args))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) asm_addressing(node ast.AsmAddressing) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmAddressing'))
+	obj.add('scale', t.number_node(node.scale))
+	obj.add('mode', t.enum_node(node.mode))
+	obj.add('displacement', t.asm_arg(node.displacement))
+	obj.add('base', t.asm_arg(node.base))
+	obj.add('index', t.asm_arg(node.index))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) asm_arg(node ast.AsmArg) &Node {
+	match node {
+		ast.AsmAddressing {
+			return t.asm_addressing(node)
+		}
+		ast.AsmAlias {
+			return t.asm_alias(node)
+		}
+		ast.AsmDisp {
+			return t.asm_disp(node)
+		}
+		ast.AsmRegister {
+			return t.asm_register(node)
+		}
+		ast.BoolLiteral {
+			return t.bool_literal(node)
+		}
+		ast.CharLiteral {
+			return t.char_literal(node)
+		}
+		ast.FloatLiteral {
+			return t.float_literal(node)
+		}
+		ast.IntegerLiteral {
+			return t.integer_literal(node)
+		}
+		string {
+			return t.string_node(node)
+		}
+	}
+}
+
+fn (t Tree) asm_alias(node ast.AsmAlias) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmAlias'))
+	obj.add('name', t.string_node(node.name))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) asm_disp(node ast.AsmDisp) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmDisp'))
+	obj.add('val', t.string_node(node.val))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+fn (t Tree) asm_clobbered(node ast.AsmClobbered) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmClobbered'))
+	obj.add('reg', t.asm_register(node.reg))
+	obj.add('comments', t.array_node_comment(node.comments))
+	return obj
+}
+
+fn (t Tree) asm_io(node ast.AsmIO) &Node {
+	mut obj := new_object()
+	obj.add('ast_type', t.string_node('AsmIO'))
+	obj.add('alias', t.string_node(node.alias))
+	obj.add('constraint', t.string_node(node.constraint))
+	obj.add('expr', t.expr(node.expr))
+	obj.add('typ', t.type_node(node.typ))
+	obj.add('comments', t.array_node_comment(node.comments))
+	obj.add('pos', t.position(node.pos))
+	return obj
+}
+
+// do not support yet by vlang
+// fn (t Tree) array_node1<T>(nodes []T, method_name string) &Node {
+// 	mut arr := new_array()
+
+// 	// call method dynamically, V do not support yet
+// 	// error: todo: not a string literal
+
+// 	// for node in nodes {
+// 	// 	arr.add_item(t.$method_name(node))
+// 	// }
+
+// 	// temp
+// 	$for method in Tree.methods {
+// 		if method.name == method_name {
+// 			for node in nodes {
+// 				res := t.$method(node)
+// 				arr.add_item(res) // TODO,waiting for bug fixed
+// 			}
+// 		}
+// 	}
+// 	return arr
+// }
+
+// do not support yet by vlang
+// fn (t Tree) array_node2<T>(nodes []T) &Node {
+// 	mut arr := new_array()
+
+// 	for node in nodes {
+// 		match node {
+// 			string {
+// 				arr.add_item(t.string_node(node))
+// 			}
+// 			ast.Comment {
+// 				arr.add_item(t.comment(node))
+// 			}
+// 			ast.ConstField {
+// 				arr.add_item(t.const_field(node))
+// 			}
+// 			else {
+// 				panic('unknown array type')
+// 			}
+// 		}
+// 	}
+
+// 	return arr
+// }
+
+// list all the different type of array node,temporarily
+fn (t Tree) array_node_string(nodes []string) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.string_node(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_position(nodes []token.Position) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.position(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_if_branch(nodes []ast.IfBranch) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.if_branch(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_fn_decl(nodes []ast.FnDecl) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.fn_decl(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_generic_fns(nodes []&ast.FnDecl) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.fn_decl(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_embed_file(nodes []ast.EmbeddedFile) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.embed_file(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_attr(nodes []ast.Attr) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.attr(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_scope_struct_field(nodes map[string]ast.ScopeStructField) &Node {
+	mut arr := new_array()
+	for _, node in nodes {
+		arr.add_item(t.scope_struct_field(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_type(nodes []ast.Type) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.type_node(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_type_expr(nodes []ast.TypeNode) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.type_expr(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_import_symbol(nodes []ast.ImportSymbol) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.import_symbol(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_comment(nodes []ast.Comment) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.comment(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_const_field(nodes []ast.ConstField) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.const_field(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_arg(nodes []ast.Param) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.arg(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_stmt(nodes []ast.Stmt) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.stmt(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_defer_stmt(nodes []ast.DeferStmt) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.defer_stmt(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_struct_field(nodes []ast.StructField) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.struct_field(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_embed(nodes []ast.Embed) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.embed(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_enum_field(nodes []ast.EnumField) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.enum_field(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_global_field(nodes []ast.GlobalField) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.global_field(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_expr(nodes []ast.Expr) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.expr(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_call_arg(nodes []ast.CallArg) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.call_arg(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_int(nodes []int) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.number_node(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_byte(nodes []byte) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.number_node(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_bool(nodes []bool) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.bool_node(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_struct_init_field(nodes []ast.StructInitField) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.struct_init_field(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_struct_init_embed(nodes []ast.StructInitEmbed) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.struct_init_embed(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_match_branch(nodes []ast.MatchBranch) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.match_branch(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_ident(nodes []ast.Ident) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.ident(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_select_branch(nodes []ast.SelectBranch) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.select_branch(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_asm_clobbered(nodes []ast.AsmClobbered) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.asm_clobbered(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_asm_template(nodes []ast.AsmTemplate) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.asm_template(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_asm_io(nodes []ast.AsmIO) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.asm_io(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_asm_arg(nodes []ast.AsmArg) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.asm_arg(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_sql_stmt_line(nodes []ast.SqlStmtLine) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.sql_stmt_line(node))
+	}
+	return arr
+}
+
+fn (t Tree) array_node_interface_embedding(nodes []ast.InterfaceEmbedding) &Node {
+	mut arr := new_array()
+	for node in nodes {
+		arr.add_item(t.interface_embedding(node))
+	}
+	return arr
+}
diff --git a/v_windows/v/cmd/tools/vbin2v.v b/v_windows/v/cmd/tools/vbin2v.v
new file mode 100644
index 0000000..c1ab6e0
--- /dev/null
+++ b/v_windows/v/cmd/tools/vbin2v.v
@@ -0,0 +1,146 @@
+module main
+
+import os
+import flag
+import strings
+
+const (
+	tool_version     = '0.0.4'
+	tool_description = 'Converts a list of arbitrary files into a single v module file.'
+)
+
+struct Context {
+mut:
+	files       []string
+	prefix      string
+	show_help   bool
+	module_name string
+	write_file  string
+}
+
+fn (context Context) header() string {
+	mut header_s := ''
+	header_s += 'module $context.module_name\n'
+	header_s += '\n'
+	allfiles := context.files.join(' ')
+	mut options := []string{}
+	if context.prefix.len > 0 {
+		options << '-p $context.prefix'
+	}
+	if context.module_name.len > 0 {
+		options << '-m $context.module_name'
+	}
+	if context.write_file.len > 0 {
+		options << '-w $context.write_file'
+	}
+	soptions := options.join(' ')
+	header_s += '// File generated by:\n'
+	header_s += '// v bin2v $allfiles $soptions\n'
+	header_s += '// Please, do not edit this file.\n'
+	header_s += '// Your changes may be overwritten.\n'
+	header_s += 'const (\n'
+	return header_s
+}
+
+fn (context Context) footer() string {
+	return ')\n'
+}
+
+fn (context Context) file2v(bname string, fbytes []byte, bn_max int) string {
+	mut sb := strings.new_builder(1000)
+	bn_diff_len := bn_max - bname.len
+	sb.write_string('\t${bname}_len' + ' '.repeat(bn_diff_len - 4) + ' = $fbytes.len\n')
+	fbyte := fbytes[0]
+	bnmae_line := '\t$bname' + ' '.repeat(bn_diff_len) + ' = [byte($fbyte), '
+	sb.write_string(bnmae_line)
+	mut line_len := bnmae_line.len + 3
+	for i := 1; i < fbytes.len; i++ {
+		b := int(fbytes[i]).str()
+		if line_len > 94 {
+			sb.go_back(1)
+			sb.write_string('\n\t\t')
+			line_len = 8
+		}
+		if i == fbytes.len - 1 {
+			sb.write_string(b)
+			line_len += b.len
+		} else {
+			sb.write_string('$b, ')
+			line_len += b.len + 2
+		}
+	}
+	sb.write_string(']!\n')
+	return sb.str()
+}
+
+fn (context Context) bname_and_bytes(file string) ?(string, []byte) {
+	fname := os.file_name(file)
+	fname_escaped := fname.replace_each(['.', '_', '-', '_'])
+	byte_name := '$context.prefix$fname_escaped'.to_lower()
+	fbytes := os.read_bytes(file) or { return error('Error: $err.msg') }
+	return byte_name, fbytes
+}
+
+fn (context Context) max_bname_len(bnames []string) int {
+	mut max := 0
+	for n in bnames {
+		if n.len > max {
+			max = n.len
+		}
+	}
+	// Add 4 to max due to "_len" suffix
+	return max + 4
+}
+
+fn main() {
+	mut context := Context{}
+	mut fp := flag.new_flag_parser(os.args[1..])
+	fp.application('v bin2v')
+	fp.version(tool_version)
+	fp.description(tool_description)
+	fp.arguments_description('FILE [FILE]...')
+	context.show_help = fp.bool('help', `h`, false, 'Show this help screen.')
+	context.module_name = fp.string('module', `m`, 'binary', 'Name of the generated module.')
+	context.prefix = fp.string('prefix', `p`, '', 'A prefix put before each resource name.')
+	context.write_file = fp.string('write', `w`, '', 'Write directly to a file with the given name.')
+	if context.show_help {
+		println(fp.usage())
+		exit(0)
+	}
+	files := fp.finalize() or {
+		eprintln('Error: $err.msg')
+		exit(1)
+	}
+	real_files := files.filter(it != 'bin2v')
+	if real_files.len == 0 {
+		println(fp.usage())
+		exit(0)
+	}
+	context.files = real_files
+	if context.write_file != '' && os.file_ext(context.write_file) !in ['.vv', '.v'] {
+		context.write_file += '.v'
+	}
+	mut file_byte_map := map[string][]byte{}
+	for file in real_files {
+		bname, fbytes := context.bname_and_bytes(file) or {
+			eprintln(err.msg)
+			exit(1)
+		}
+		file_byte_map[bname] = fbytes
+	}
+	max_bname := context.max_bname_len(file_byte_map.keys())
+	if context.write_file.len > 0 {
+		mut out_file := os.create(context.write_file) ?
+		out_file.write_string(context.header()) ?
+		for bname, fbytes in file_byte_map {
+			out_file.write_string(context.file2v(bname, fbytes, max_bname)) ?
+		}
+		out_file.write_string(context.footer()) ?
+	} else {
+		print(context.header())
+		for bname, fbytes in file_byte_map {
+			print(context.file2v(bname, fbytes, max_bname))
+		}
+		print(context.footer())
+	}
+}
diff --git a/v_windows/v/cmd/tools/vbug.v b/v_windows/v/cmd/tools/vbug.v
new file mode 100644
index 0000000..67fc186
--- /dev/null
+++ b/v_windows/v/cmd/tools/vbug.v
@@ -0,0 +1,209 @@
+import dl
+import net.urllib
+import os
+import readline
+
+const vroot = @VMODROOT
+
+// get output from `v doctor`
+fn get_vdoctor_output(is_verbose bool) string {
+	vexe := os.getenv('VEXE')
+	verbose_flag := if is_verbose { '-v' } else { '' }
+	result := os.execute('$vexe $verbose_flag doctor')
+	if result.exit_code != 0 {
+		eprintln('unable to get `v doctor` output: $result.output')
+		return ''
+	}
+	return result.output
+}
+
+// get ouput from `v -g -o vdbg cmd/v && vdbg file.v`
+fn get_v_build_output(is_verbose bool, is_yes bool, file_path string) string {
+	mut vexe := os.getenv('VEXE')
+	// prepare a V compiler with -g to have better backtraces if possible
+	wd := os.getwd()
+	os.chdir(vroot) or {}
+	verbose_flag := if is_verbose { '-v' } else { '' }
+	vdbg_path := $if windows { '$vroot/vdbg.exe' } $else { '$vroot/vdbg' }
+	vdbg_compilation_cmd := '"$vexe" $verbose_flag -g -o "$vdbg_path" cmd/v'
+	vdbg_result := os.execute(vdbg_compilation_cmd)
+	os.chdir(wd) or {}
+	if vdbg_result.exit_code == 0 {
+		vexe = vdbg_path
+	} else {
+		eprintln('unable to compile V in debug mode: $vdbg_result.output\ncommand: $vdbg_compilation_cmd\n')
+	}
+	//
+	mut result := os.execute('"$vexe" $verbose_flag "$file_path"')
+	defer {
+		os.rm(vdbg_path) or {
+			if is_verbose {
+				eprintln('unable to delete `vdbg`: $err')
+			}
+		}
+	}
+	if result.exit_code == 0 {
+		defer {
+			mut generated_file := file_path.all_before_last('.')
+			$if windows {
+				generated_file += '.exe'
+			}
+			os.rm(generated_file) or {
+				if is_verbose {
+					eprintln('unable to delete generated file: $err')
+				}
+			}
+		}
+		run := is_yes
+			|| ask('It looks like the compilation went well, do you want to run the file?')
+		if run {
+			result = os.execute('"$vexe" $verbose_flag run "$file_path"')
+			if result.exit_code == 0 && !is_yes {
+				confirm_or_exit('It looks like the file ran correctly as well, are you sure you want to continue?')
+			}
+		}
+	}
+	return result.output
+}
+
+type ShellExecuteWin = fn (voidptr, &u16, &u16, &u16, &u16, int)
+
+// open a uri using the default associated application
+fn open_browser(uri string) ? {
+	$if macos {
+		result := os.execute('open "$uri"')
+		if result.exit_code != 0 {
+			return error('unable to open url: $result.output')
+		}
+	} $else $if freebsd || openbsd {
+		result := os.execute('xdg-open "$uri"')
+		if result.exit_code != 0 {
+			return error('unable to open url: $result.output')
+		}
+	} $else $if linux {
+		providers := ['xdg-open', 'x-www-browser', 'www-browser', 'wslview']
+
+		// There are multiple possible providers to open a browser on linux
+		// One of them is xdg-open, another is x-www-browser, then there's www-browser, etc.
+		// Look for one that exists and run it
+		for provider in providers {
+			if os.exists_in_system_path(provider) {
+				result := os.execute('$provider "$uri"')
+				if result.exit_code != 0 {
+					return error('unable to open url: $result.output')
+				}
+				break
+			}
+		}
+	} $else $if windows {
+		handle := dl.open_opt('shell32', dl.rtld_now) ?
+		// https://docs.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-shellexecutew
+		func := ShellExecuteWin(dl.sym_opt(handle, 'ShellExecuteW') ?)
+		func(C.NULL, 'open'.to_wide(), uri.to_wide(), C.NULL, C.NULL, C.SW_SHOWNORMAL)
+		dl.close(handle)
+	} $else {
+		return error('unsupported platform')
+	}
+}
+
+fn ask(msg string) bool {
+	prompt := os.input_opt('$msg [Y/n] ') or { 'y' }
+	return prompt == '' || prompt[0].ascii_str().to_lower() != 'n'
+}
+
+fn confirm_or_exit(msg string) {
+	if !ask(msg) {
+		exit(1)
+	}
+}
+
+fn main() {
+	mut file_path := ''
+	mut is_verbose := false
+	mut is_yes := false
+	for arg in os.args[2..] {
+		match arg {
+			'-v' {
+				is_verbose = true
+			}
+			'-y' {
+				is_yes = true
+			}
+			else {
+				if !arg.ends_with('.v') && !arg.ends_with('.vsh') && !arg.ends_with('.vv') {
+					eprintln('unknown argument: `$arg`')
+					exit(1)
+				}
+				if file_path != '' {
+					eprintln('only one V file can be submitted')
+					exit(1)
+				}
+				file_path = arg
+			}
+		}
+	}
+	if file_path == '' {
+		eprintln('v bug: no v file listed to report')
+		exit(1)
+	}
+	// collect error information
+	// output from `v doctor`
+	vdoctor_output := get_vdoctor_output(is_verbose)
+	// file content
+	file_content := os.read_file(file_path) or {
+		eprintln('unable to get file "$file_path" content: $err')
+		''
+	}
+	// output from `v -g -o vdbg cmd/v && vdbg file.v`
+	build_output := get_v_build_output(is_verbose, is_yes, file_path)
+	// ask the user if he wants to submit even after an error
+	if !is_yes && (vdoctor_output == '' || file_content == '' || build_output == '') {
+		confirm_or_exit('An error occured retrieving the information, do you want to continue?')
+	}
+
+	expected_result := readline.read_line('What did you expect to see? ') or {
+		// Ctrl-C was pressed
+		eprintln('\nCanceled')
+		exit(1)
+	}
+	// open prefilled issue creation page, or print link as a fallback
+
+	if !is_yes && vdoctor_output.contains('behind V master') {
+		confirm_or_exit('It looks like your installation of V is outdated, we advise you to run `v up` before submitting an issue. Are you sure you want to continue?')
+	}
+
+	// When updating this template, make sure to update `.github/ISSUE_TEMPLATE/bug_report.md` too
+	raw_body := '<!-- It is advisable to update all relevant modules using `v outdated` and `v install` -->
+**V doctor:**
+```
+$vdoctor_output
+```
+
+**What did you do?**
+`v -g -o vdbg cmd/v && vdbg $file_path`
+{file_content}
+
+**What did you expect to see?**
+
+$expected_result
+
+**What did you see instead?**
+```
+$build_output```'
+	mut encoded_body := urllib.query_escape(raw_body.replace_once('{file_content}', '```v\n$file_content\n```'))
+	mut generated_uri := 'https://github.com/vlang/v/issues/new?labels=Bug&body=$encoded_body'
+	if generated_uri.len > 8192 {
+		// GitHub doesn't support URLs longer than 8192 characters
+		encoded_body = urllib.query_escape(raw_body.replace_once('{file_content}', 'See attached file `$file_path`'))
+		generated_uri = 'https://github.com/vlang/v/issues/new?labels=Bug&body=$encoded_body'
+		println('Your file is too big to be submitted. Head over to the following URL and attach your file.')
+		println(generated_uri)
+	} else {
+		open_browser(generated_uri) or {
+			if is_verbose {
+				eprintln(err)
+			}
+			println(generated_uri)
+		}
+	}
+}
diff --git a/v_windows/v/cmd/tools/vbuild-examples.v b/v_windows/v/cmd/tools/vbuild-examples.v
new file mode 100644
index 0000000..82ddc1e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vbuild-examples.v
@@ -0,0 +1,15 @@
+module main
+
+import os
+import testing
+
+fn main() {
+	args_string := os.args[1..].join(' ')
+	params := args_string.all_before('build-examples')
+	if testing.v_build_failing(params, 'examples') {
+		exit(1)
+	}
+	if testing.v_build_failing(params + '-live', os.join_path('examples', 'hot_reload')) {
+		exit(1)
+	}
+}
diff --git a/v_windows/v/cmd/tools/vbuild-tools.v b/v_windows/v/cmd/tools/vbuild-tools.v
new file mode 100644
index 0000000..7ad1dbb
--- /dev/null
+++ b/v_windows/v/cmd/tools/vbuild-tools.v
@@ -0,0 +1,71 @@
+module main
+
+import os
+import testing
+import v.util
+
+// NB: tools like vdoc are compiled in their own subfolder
+// => cmd/tools/vdoc/vdoc.exe
+// Usually, they have several top level .v files in the subfolder,
+// that cannot be compiled separately, but instead, the whole folder,
+// should be compiled (v folder).
+// To implement that, these folders are initially skipped, then added
+// as a whole *after the testing.prepare_test_session call*.
+const tools_in_subfolders = ['vdoc', 'vvet', 'vast']
+
+// non_packaged_tools are tools that should not be packaged with
+// prebuild versions of V, to keep the size smaller.
+// They are mainly usefull for the V project itself, not to end users.
+const non_packaged_tools = ['gen1m', 'gen_vc', 'fast', 'wyhash']
+
+fn main() {
+	util.ensure_modules_for_all_tools_are_installed('-v' in os.args)
+	args_string := os.args[1..].join(' ')
+	vexe := os.getenv('VEXE')
+	vroot := os.dir(vexe)
+	os.chdir(vroot) ?
+	folder := os.join_path('cmd', 'tools')
+	tfolder := os.join_path(vroot, 'cmd', 'tools')
+	main_label := 'Building $folder ...'
+	finish_label := 'building $folder'
+	//
+	mut skips := []string{}
+	for stool in tools_in_subfolders {
+		skips << os.join_path(tfolder, stool)
+	}
+	buildopts := args_string.all_before('build-tools')
+	mut session := testing.prepare_test_session(buildopts, folder, skips, main_label)
+	session.rm_binaries = false
+	for stool in tools_in_subfolders {
+		session.add(os.join_path(tfolder, stool))
+	}
+	// eprintln('> session.files: $session.files')
+	// eprintln('> session.skip_files: $session.skip_files')
+	session.test()
+	eprintln(session.benchmark.total_message(finish_label))
+	if session.failed {
+		exit(1)
+	}
+	//
+	mut executables := os.ls(session.vtmp_dir) ?
+	executables.sort()
+	for texe in executables {
+		tname := texe.replace(os.file_ext(texe), '')
+		if tname in non_packaged_tools {
+			continue
+		}
+		//
+		tpath := os.join_path(session.vtmp_dir, texe)
+		if tname in tools_in_subfolders {
+			os.mv_by_cp(tpath, os.join_path(tfolder, tname, texe)) or { panic(err) }
+			continue
+		}
+		target_path := os.join_path(tfolder, texe)
+		os.mv_by_cp(tpath, target_path) or {
+			if !err.msg.contains('vbuild-tools') && !err.msg.contains('vtest-all') {
+				eprintln('error while moving $tpath to $target_path: $err.msg')
+			}
+			continue
+		}
+	}
+}
diff --git a/v_windows/v/cmd/tools/vbuild-vbinaries.v b/v_windows/v/cmd/tools/vbuild-vbinaries.v
new file mode 100644
index 0000000..49e297e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vbuild-vbinaries.v
@@ -0,0 +1,9 @@
+module main
+
+import testing
+
+fn main() {
+	if testing.building_any_v_binaries_failed() {
+		exit(1)
+	}
+}
diff --git a/v_windows/v/cmd/tools/vcheck-md.v b/v_windows/v/cmd/tools/vcheck-md.v
new file mode 100644
index 0000000..b485ae1
--- /dev/null
+++ b/v_windows/v/cmd/tools/vcheck-md.v
@@ -0,0 +1,550 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module main
+
+import os
+import os.cmdline
+import rand
+import term
+import vhelp
+import v.pref
+import regex
+
+const (
+	too_long_line_length_example   = 120
+	too_long_line_length_codeblock = 120
+	too_long_line_length_table     = 120
+	too_long_line_length_link      = 150
+	too_long_line_length_other     = 100
+	term_colors                    = term.can_show_color_on_stderr()
+	hide_warnings                  = '-hide-warnings' in os.args || '-w' in os.args
+	show_progress                  = os.getenv('GITHUB_JOB') == '' && '-silent' !in os.args
+	non_option_args                = cmdline.only_non_options(os.args[2..])
+)
+
+struct CheckResult {
+pub mut:
+	warnings int
+	errors   int
+	oks      int
+}
+
+fn (v1 CheckResult) + (v2 CheckResult) CheckResult {
+	return CheckResult{
+		warnings: v1.warnings + v2.warnings
+		errors: v1.errors + v2.errors
+		oks: v1.oks + v2.oks
+	}
+}
+
+fn main() {
+	if non_option_args.len == 0 || '-help' in os.args {
+		vhelp.show_topic('check-md')
+		exit(0)
+	}
+	if '-all' in os.args {
+		println('´-all´ flag is deprecated. Please use ´v check-md .´ instead.')
+		exit(1)
+	}
+	if show_progress {
+		// this is intended to be replaced by the progress lines
+		println('')
+	}
+	mut files_paths := non_option_args.clone()
+	mut res := CheckResult{}
+	if term_colors {
+		os.setenv('VCOLORS', 'always', true)
+	}
+	for i := 0; i < files_paths.len; i++ {
+		file_path := files_paths[i]
+		if os.is_dir(file_path) {
+			files_paths << md_file_paths(file_path)
+			continue
+		}
+		real_path := os.real_path(file_path)
+		lines := os.read_lines(real_path) or {
+			println('"$file_path" does not exist')
+			res.warnings++
+			continue
+		}
+		mut mdfile := MDFile{
+			path: file_path
+			lines: lines
+		}
+		res += mdfile.check()
+	}
+	if res.errors == 0 && show_progress {
+		term.clear_previous_line()
+	}
+	if res.warnings > 0 || res.errors > 0 || res.oks > 0 {
+		println('\nWarnings: $res.warnings | Errors: $res.errors | OKs: $res.oks')
+	}
+	if res.errors > 0 {
+		exit(1)
+	}
+}
+
+fn md_file_paths(dir string) []string {
+	mut files_to_check := []string{}
+	md_files := os.walk_ext(dir, '.md')
+	for file in md_files {
+		if file.contains_any_substr(['/thirdparty/', 'CHANGELOG']) {
+			continue
+		}
+		files_to_check << file
+	}
+	return files_to_check
+}
+
+fn wprintln(s string) {
+	if !hide_warnings {
+		println(s)
+	}
+}
+
+fn ftext(s string, cb fn (string) string) string {
+	if term_colors {
+		return cb(s)
+	}
+	return s
+}
+
+fn btext(s string) string {
+	return ftext(s, term.bold)
+}
+
+fn mtext(s string) string {
+	return ftext(s, term.magenta)
+}
+
+fn rtext(s string) string {
+	return ftext(s, term.red)
+}
+
+fn wline(file_path string, lnumber int, column int, message string) string {
+	return btext('$file_path:${lnumber + 1}:${column + 1}:') + btext(mtext(' warn:')) +
+		rtext(' $message')
+}
+
+fn eline(file_path string, lnumber int, column int, message string) string {
+	return btext('$file_path:${lnumber + 1}:${column + 1}:') + btext(rtext(' error: $message'))
+}
+
+const (
+	default_command = 'compile'
+)
+
+struct VCodeExample {
+mut:
+	text    []string
+	command string
+	sline   int
+	eline   int
+}
+
+enum MDFileParserState {
+	markdown
+	vexample
+	codeblock
+}
+
+struct MDFile {
+	path  string
+	lines []string
+mut:
+	examples []VCodeExample
+	current  VCodeExample
+	state    MDFileParserState = .markdown
+}
+
+fn (mut f MDFile) progress(message string) {
+	if show_progress {
+		term.clear_previous_line()
+		println('File: ${f.path:-30s}, Lines: ${f.lines.len:5}, $message')
+	}
+}
+
+fn (mut f MDFile) check() CheckResult {
+	mut res := CheckResult{}
+	mut anchor_data := AnchorData{}
+	for j, line in f.lines {
+		// f.progress('line: $j')
+		if f.state == .vexample {
+			if line.len > too_long_line_length_example {
+				wprintln(wline(f.path, j, line.len, 'long V example line'))
+				wprintln(line)
+				res.warnings++
+			}
+		} else if f.state == .codeblock {
+			if line.len > too_long_line_length_codeblock {
+				wprintln(wline(f.path, j, line.len, 'long code block line'))
+				wprintln(line)
+				res.warnings++
+			}
+		} else if line.starts_with('|') {
+			if line.len > too_long_line_length_table {
+				wprintln(wline(f.path, j, line.len, 'long table'))
+				wprintln(line)
+				res.warnings++
+			}
+		} else if line.contains('http') {
+			if line.all_after('https').len > too_long_line_length_link {
+				wprintln(wline(f.path, j, line.len, 'long link'))
+				wprintln(line)
+				res.warnings++
+			}
+		} else if line.len > too_long_line_length_other {
+			eprintln(eline(f.path, j, line.len, 'line too long'))
+			eprintln(line)
+			res.errors++
+		}
+		if f.state == .markdown {
+			anchor_data.add_links(j, line)
+			anchor_data.add_link_targets(j, line)
+		}
+
+		f.parse_line(j, line)
+	}
+	anchor_data.check_link_target_match(f.path, mut res)
+	res += f.check_examples()
+	return res
+}
+
+fn (mut f MDFile) parse_line(lnumber int, line string) {
+	if line.starts_with('```v') {
+		if f.state == .markdown {
+			f.state = .vexample
+			mut command := line.replace('```v', '').trim_space()
+			if command == '' {
+				command = default_command
+			} else if command == 'nofmt' {
+				command += ' $default_command'
+			}
+			f.current = VCodeExample{
+				sline: lnumber
+				command: command
+			}
+		}
+		return
+	}
+	if line.starts_with('```') {
+		match f.state {
+			.vexample {
+				f.state = .markdown
+				f.current.eline = lnumber
+				f.examples << f.current
+				f.current = VCodeExample{}
+				return
+			}
+			.codeblock {
+				f.state = .markdown
+				return
+			}
+			.markdown {
+				f.state = .codeblock
+				return
+			}
+		}
+	}
+	if f.state == .vexample {
+		f.current.text << line
+	}
+}
+
+struct Headline {
+	line  int
+	lable string
+	level int
+}
+
+struct Anchor {
+	line int
+}
+
+type AnchorTarget = Anchor | Headline
+
+struct AnchorLink {
+	line  int
+	lable string
+}
+
+struct AnchorData {
+mut:
+	links   map[string][]AnchorLink
+	anchors map[string][]AnchorTarget
+}
+
+fn (mut ad AnchorData) add_links(line_number int, line string) {
+	query := r'\[(?P<lable>[^\]]+)\]\(\s*#(?P<link>[a-z0-9\-\_\x7f-\uffff]+)\)'
+	mut re := regex.regex_opt(query) or { panic(err) }
+	res := re.find_all_str(line)
+
+	for elem in res {
+		re.match_string(elem)
+		link := re.get_group_by_name(elem, 'link')
+		ad.links[link] << AnchorLink{
+			line: line_number
+			lable: re.get_group_by_name(elem, 'lable')
+		}
+	}
+}
+
+fn (mut ad AnchorData) add_link_targets(line_number int, line string) {
+	if line.trim_space().starts_with('#') {
+		if headline_start_pos := line.index(' ') {
+			headline := line.substr(headline_start_pos + 1, line.len)
+			link := create_ref_link(headline)
+			ad.anchors[link] << Headline{
+				line: line_number
+				lable: headline
+				level: headline_start_pos
+			}
+		}
+	} else {
+		query := '<a\\s*id=["\'](?P<link>[a-z0-9\\-\\_\\x7f-\\uffff]+)["\']\\s*/>'
+		mut re := regex.regex_opt(query) or { panic(err) }
+		res := re.find_all_str(line)
+
+		for elem in res {
+			re.match_string(elem)
+			link := re.get_group_by_name(elem, 'link')
+			ad.anchors[link] << Anchor{
+				line: line_number
+			}
+		}
+	}
+}
+
+fn (mut ad AnchorData) check_link_target_match(fpath string, mut res CheckResult) {
+	mut checked_headlines := []string{}
+	mut found_error_warning := false
+	for link, linkdata in ad.links {
+		if link in ad.anchors {
+			checked_headlines << link
+			if ad.anchors[link].len > 1 {
+				found_error_warning = true
+				res.errors++
+				for anchordata in ad.anchors[link] {
+					eprintln(eline(fpath, anchordata.line, 0, 'multiple link targets of existing link (#$link)'))
+				}
+			}
+		} else {
+			found_error_warning = true
+			res.errors++
+			for brokenlink in linkdata {
+				eprintln(eline(fpath, brokenlink.line, 0, 'no link target found for existing link [$brokenlink.lable](#$link)'))
+			}
+		}
+	}
+	for link, anchor_lists in ad.anchors {
+		if link !in checked_headlines {
+			if anchor_lists.len > 1 {
+				for anchor in anchor_lists {
+					line := match anchor {
+						Headline {
+							anchor.line
+						}
+						Anchor {
+							anchor.line
+						}
+					}
+					wprintln(wline(fpath, line, 0, 'multiple link target for non existing link (#$link)'))
+					found_error_warning = true
+					res.warnings++
+				}
+			}
+		}
+	}
+	if found_error_warning {
+		eprintln('') // fix suppressed last error output
+	}
+}
+
+// based on a reference sample md doc
+// https://github.com/aheissenberger/vlang-markdown-module/blob/master/test.md
+fn create_ref_link(s string) string {
+	mut result := ''
+	for c in s.trim_space() {
+		result += match c {
+			`a`...`z`, `0`...`9` {
+				c.ascii_str()
+			}
+			`A`...`Z` {
+				c.ascii_str().to_lower()
+			}
+			` `, `-` {
+				'-'
+			}
+			`_` {
+				'_'
+			}
+			else {
+				if c > 127 { c.ascii_str() } else { '' }
+			}
+		}
+	}
+	return result
+}
+
+fn (mut f MDFile) debug() {
+	for e in f.examples {
+		eprintln('f.path: $f.path | example: $e')
+	}
+}
+
+fn cmdexecute(cmd string) int {
+	res := os.execute(cmd)
+	if res.exit_code < 0 {
+		return 1
+	}
+	if res.exit_code != 0 {
+		eprint(res.output)
+	}
+	return res.exit_code
+}
+
+fn silent_cmdexecute(cmd string) int {
+	res := os.execute(cmd)
+	return res.exit_code
+}
+
+fn get_fmt_exit_code(vfile string, vexe string) int {
+	return silent_cmdexecute('"$vexe" fmt -verify $vfile')
+}
+
+fn (mut f MDFile) check_examples() CheckResult {
+	mut errors := 0
+	mut oks := 0
+	vexe := pref.vexe_path()
+	for e in f.examples {
+		if e.command == 'ignore' {
+			continue
+		}
+		if e.command == 'wip' {
+			continue
+		}
+		fname := os.base(f.path).replace('.md', '_md')
+		uid := rand.ulid()
+		vfile := os.join_path(os.temp_dir(), 'check_${fname}_example_${e.sline}__${e.eline}__${uid}.v')
+		mut should_cleanup_vfile := true
+		// eprintln('>>> checking example $vfile ...')
+		vcontent := e.text.join('\n') + '\n'
+		os.write_file(vfile, vcontent) or { panic(err) }
+		mut acommands := e.command.split(' ')
+		nofmt := 'nofmt' in acommands
+		for command in acommands {
+			f.progress('example from $e.sline to $e.eline, command: $command')
+			fmt_res := if nofmt { 0 } else { get_fmt_exit_code(vfile, vexe) }
+			match command {
+				'compile' {
+					res := cmdexecute('"$vexe" -w -Wfatal-errors -o x.c $vfile')
+					os.rm('x.c') or {}
+					if res != 0 || fmt_res != 0 {
+						if res != 0 {
+							eprintln(eline(f.path, e.sline, 0, 'example failed to compile'))
+						}
+						if fmt_res != 0 {
+							eprintln(eline(f.path, e.sline, 0, 'example is not formatted'))
+						}
+						eprintln(vcontent)
+						should_cleanup_vfile = false
+						errors++
+						continue
+					}
+					oks++
+				}
+				'globals' {
+					res := cmdexecute('"$vexe" -w -Wfatal-errors -enable-globals -o x.c $vfile')
+					os.rm('x.c') or {}
+					if res != 0 || fmt_res != 0 {
+						if res != 0 {
+							eprintln(eline(f.path, e.sline, 0, '`example failed to compile with -enable-globals'))
+						}
+						if fmt_res != 0 {
+							eprintln(eline(f.path, e.sline, 0, '`example is not formatted'))
+						}
+						eprintln(vcontent)
+						should_cleanup_vfile = false
+						errors++
+						continue
+					}
+					oks++
+				}
+				'live' {
+					res := cmdexecute('"$vexe" -w -Wfatal-errors -live -o x.c $vfile')
+					if res != 0 || fmt_res != 0 {
+						if res != 0 {
+							eprintln(eline(f.path, e.sline, 0, 'example failed to compile with -live'))
+						}
+						if fmt_res != 0 {
+							eprintln(eline(f.path, e.sline, 0, 'example is not formatted'))
+						}
+						eprintln(vcontent)
+						should_cleanup_vfile = false
+						errors++
+						continue
+					}
+					oks++
+				}
+				'failcompile' {
+					res := silent_cmdexecute('"$vexe" -w -Wfatal-errors -o x.c $vfile')
+					os.rm('x.c') or {}
+					if res == 0 || fmt_res != 0 {
+						if res == 0 {
+							eprintln(eline(f.path, e.sline, 0, '`failcompile` example compiled'))
+						}
+						if fmt_res != 0 {
+							eprintln(eline(f.path, e.sline, 0, 'example is not formatted'))
+						}
+						eprintln(vcontent)
+						should_cleanup_vfile = false
+						errors++
+						continue
+					}
+					oks++
+				}
+				'oksyntax' {
+					res := cmdexecute('"$vexe" -w -Wfatal-errors -check-syntax $vfile')
+					if res != 0 || fmt_res != 0 {
+						if res != 0 {
+							eprintln(eline(f.path, e.sline, 0, '`oksyntax` example with invalid syntax'))
+						}
+						if fmt_res != 0 {
+							eprintln(eline(f.path, e.sline, 0, '`oksyntax` example is not formatted'))
+						}
+						eprintln(vcontent)
+						should_cleanup_vfile = false
+						errors++
+						continue
+					}
+					oks++
+				}
+				'badsyntax' {
+					res := silent_cmdexecute('"$vexe" -w -Wfatal-errors -check-syntax $vfile')
+					if res == 0 {
+						eprintln(eline(f.path, e.sline, 0, '`badsyntax` example can be parsed fine'))
+						eprintln(vcontent)
+						should_cleanup_vfile = false
+						errors++
+						continue
+					}
+					oks++
+				}
+				'nofmt' {}
+				else {
+					eprintln(eline(f.path, e.sline, 0, 'unrecognized command: "$command", use one of: wip/ignore/compile/failcompile/oksyntax/badsyntax'))
+					should_cleanup_vfile = false
+					errors++
+				}
+			}
+		}
+		if should_cleanup_vfile {
+			os.rm(vfile) or { panic(err) }
+		}
+	}
+	return CheckResult{
+		errors: errors
+		oks: oks
+	}
+}
diff --git a/v_windows/v/cmd/tools/vcomplete.v b/v_windows/v/cmd/tools/vcomplete.v
new file mode 100644
index 0000000..5558382
--- /dev/null
+++ b/v_windows/v/cmd/tools/vcomplete.v
@@ -0,0 +1,452 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+//
+// Utility functions helping integrate with various shell auto-completion systems.
+// The install process and communication is inspired from that of [kitty](https://sw.kovidgoyal.net/kitty/#completion-for-kitty)
+// This method avoids writing and maintaining external files on the user's file system.
+// The user will be responsible for adding a small line to their .*rc - that will ensure *live* (i.e. not-static)
+// auto-completion features.
+//
+// # bash
+// To install auto-completion for V in bash, simply add this code to your `~/.bashrc`:
+// `source /dev/stdin <<<"$(v complete setup bash)"`
+// On more recent versions of bash (>3.2) this should suffice:
+// `source <(v complete setup bash)`
+//
+// # fish
+// For versions of fish <3.0.0, add the following to your `~/.config/fish/config.fish`
+// `v complete setup fish | source`
+// Later versions of fish source completions by default.
+//
+// # zsh
+// To install auto-completion for V in zsh - please add the following to your `~/.zshrc`:
+// ```
+// autoload -Uz compinit
+// compinit
+// # Completion for v
+// v complete setup zsh | source /dev/stdin
+// ```
+// Please note that you should let v load the zsh completions after the call to compinit
+//
+// # powershell
+// To install auto-complete for V in PowerShell, simply do this
+// `v complete setup powershell >> $PROFILE`
+// and reload profile
+// `& $PROFILE`
+// If `$PROFILE` didn't exist yet, create it before
+// `New-Item -Type File -Force $PROFILE`
+//
+module main
+
+import os
+
+const (
+	auto_complete_shells = ['bash', 'fish', 'zsh', 'powershell'] // list of supported shells
+	vexe                 = os.getenv('VEXE')
+)
+
+// Snooped from cmd/v/v.v, vlib/v/pref/pref.v
+const (
+	auto_complete_commands    = [
+		// simple_cmd
+		'fmt',
+		'up',
+		'vet',
+		'self',
+		'tracev',
+		'symlink',
+		'bin2v',
+		'test',
+		'test-fmt',
+		'test-self',
+		'test-cleancode',
+		'repl',
+		'complete',
+		'build-tools',
+		'build-examples',
+		'build-vbinaries',
+		'setup-freetype',
+		'doc',
+		'doctor',
+		// commands
+		'help',
+		'new',
+		'init',
+		'complete',
+		'translate',
+		'self',
+		'search',
+		'install',
+		'update',
+		'upgrade',
+		'outdated',
+		'list',
+		'remove',
+		'vlib-docs',
+		'get',
+		'version',
+		'run',
+		'build',
+		'build-module',
+	]
+	auto_complete_flags       = [
+		'-apk',
+		'-show-timings',
+		'-check-syntax',
+		'-v',
+		'-progress',
+		'-silent',
+		'-g',
+		'-cg',
+		'-repl',
+		'-live',
+		'-sharedlive',
+		'-shared',
+		'--enable-globals',
+		'-enable-globals',
+		'-autofree',
+		'-compress',
+		'-freestanding',
+		'-no-preludes',
+		'-prof',
+		'-profile',
+		'-profile-no-inline',
+		'-prod',
+		'-simulator',
+		'-stats',
+		'-obfuscate',
+		'-translated',
+		'-color',
+		'-nocolor',
+		'-showcc',
+		'-show-c-output',
+		'-experimental',
+		'-usecache',
+		'-prealloc',
+		'-parallel',
+		'-native',
+		'-W',
+		'-keepc',
+		'-w',
+		'-print-v-files',
+		'-error-limit',
+		'-message-limit',
+		'-os',
+		'-printfn',
+		'-cflags',
+		'-define',
+		'-d',
+		'-cc',
+		'-o',
+		'-b',
+		'-path',
+		'-custom-prelude',
+		'-name',
+		'-bundle',
+		'-V',
+		'-version',
+		'--version',
+	]
+	auto_complete_flags_doc   = [
+		'-all',
+		'-f',
+		'-h',
+		'-help',
+		'-m',
+		'-o',
+		'-readme',
+		'-v',
+		'-filename',
+		'-pos',
+		'-no-timestamp',
+		'-inline-assets',
+		'-open',
+		'-p',
+		'-s',
+		'-l',
+	]
+	auto_complete_flags_fmt   = [
+		'-c',
+		'-diff',
+		'-l',
+		'-w',
+		'-debug',
+		'-verify',
+	]
+	auto_complete_flags_bin2v = [
+		'-h',
+		'--help',
+		'-m',
+		'--module',
+		'-p',
+		'--prefix',
+		'-w',
+		'--write',
+	]
+	auto_complete_flags_self  = [
+		'-prod',
+	]
+	auto_complete_compilers   = [
+		'cc',
+		'gcc',
+		'tcc',
+		'tinyc',
+		'clang',
+		'mingw',
+		'msvc',
+	]
+)
+
+// auto_complete prints auto completion results back to the calling shell's completion system.
+// auto_complete acts as communication bridge between the calling shell and V's completions.
+fn auto_complete(args []string) {
+	if args.len <= 1 || args[0] != 'complete' {
+		if args.len == 1 {
+			eprintln('auto completion require arguments to work.')
+		} else {
+			eprintln('auto completion failed for "$args".')
+		}
+		exit(1)
+	}
+	sub := args[1]
+	sub_args := args[1..]
+	match sub {
+		'setup' {
+			if sub_args.len <= 1 || sub_args[1] !in auto_complete_shells {
+				eprintln('please specify a shell to setup auto completion for ($auto_complete_shells).')
+				exit(1)
+			}
+			shell := sub_args[1]
+			mut setup := ''
+			match shell {
+				'bash' {
+					setup = '
+_v_completions() {
+	local src
+	local limit
+	# Send all words up to the word the cursor is currently on
+	let limit=1+\$COMP_CWORD
+	src=\$($vexe complete bash \$(printf "%s\\n" \${COMP_WORDS[@]: 0:\$limit}))
+	if [[ \$? == 0 ]]; then
+		eval \${src}
+		#echo \${src}
+	fi
+}
+
+complete -o nospace -F _v_completions v
+'
+				}
+				'fish' {
+					setup = '
+function __v_completions
+	# Send all words up to the one before the cursor
+	$vexe complete fish (commandline -cop)
+end
+complete -f -c v -a "(__v_completions)"
+'
+				}
+				'zsh' {
+					setup = '
+#compdef v
+_v() {
+	local src
+	# Send all words up to the word the cursor is currently on
+	src=\$($vexe complete zsh \$(printf "%s\\n" \${(@)words[1,\$CURRENT]}))
+	if [[ \$? == 0 ]]; then
+		eval \${src}
+		#echo \${src}
+	fi
+}
+compdef _v v
+'
+				}
+				'powershell' {
+					setup = '
+Register-ArgumentCompleter -Native -CommandName v -ScriptBlock {
+	param(\$commandName, \$wordToComplete, \$cursorPosition)
+		$vexe complete powershell "\$wordToComplete" | ForEach-Object {
+			[System.Management.Automation.CompletionResult]::new(\$_, \$_, \'ParameterValue\', \$_)
+		}
+}
+'
+				}
+				else {}
+			}
+			println(setup)
+		}
+		'bash' {
+			if sub_args.len <= 1 {
+				exit(0)
+			}
+			mut lines := []string{}
+			list := auto_complete_request(sub_args[1..])
+			for entry in list {
+				lines << "COMPREPLY+=('$entry')"
+			}
+			println(lines.join('\n'))
+		}
+		'fish', 'powershell' {
+			if sub_args.len <= 1 {
+				exit(0)
+			}
+			mut lines := []string{}
+			list := auto_complete_request(sub_args[1..])
+			for entry in list {
+				lines << '$entry'
+			}
+			println(lines.join('\n'))
+		}
+		'zsh' {
+			if sub_args.len <= 1 {
+				exit(0)
+			}
+			mut lines := []string{}
+			list := auto_complete_request(sub_args[1..])
+			for entry in list {
+				lines << 'compadd -U -S' + '""' + ' -- ' + "'$entry';"
+			}
+			println(lines.join('\n'))
+		}
+		else {}
+	}
+	exit(0)
+}
+
+// append_separator_if_dir is a utility function.that returns the input `path` appended an
+// OS dependant path separator if the `path` is a directory.
+fn append_separator_if_dir(path string) string {
+	if os.is_dir(path) && !path.ends_with(os.path_separator) {
+		return path + os.path_separator
+	}
+	return path
+}
+
+// auto_complete_request retuns a list of completions resolved from a full argument list.
+fn auto_complete_request(args []string) []string {
+	// Using space will ensure a uniform input in cases where the shell
+	// returns the completion input as a string (['v','run'] vs. ['v run']).
+	split_by := ' '
+	request := args.join(split_by)
+	mut list := []string{}
+	// new_part := request.ends_with('\n\n')
+	mut parts := request.trim_right(' ').split(split_by)
+	if parts.len <= 1 { // 'v <tab>' -> top level commands.
+		for command in auto_complete_commands {
+			list << command
+		}
+	} else {
+		part := parts.last().trim(' ')
+		mut parent_command := ''
+		for i := parts.len - 1; i >= 0; i-- {
+			if parts[i].starts_with('-') {
+				continue
+			}
+			parent_command = parts[i]
+			break
+		}
+		get_flags := fn (base []string, flag string) []string {
+			if flag.len == 1 { return base
+			 } else { return base.filter(it.starts_with(flag))
+			 }
+		}
+		if part.starts_with('-') { // 'v -<tab>' -> flags.
+			match parent_command {
+				'bin2v' { // 'v bin2v -<tab>'
+					list = get_flags(auto_complete_flags_bin2v, part)
+				}
+				'build' { // 'v build -<tab>' -> flags.
+					list = get_flags(auto_complete_flags, part)
+				}
+				'doc' { // 'v doc -<tab>' -> flags.
+					list = get_flags(auto_complete_flags_doc, part)
+				}
+				'fmt' { // 'v fmt -<tab>' -> flags.
+					list = get_flags(auto_complete_flags_fmt, part)
+				}
+				'self' { // 'v self -<tab>' -> flags.
+					list = get_flags(auto_complete_flags_self, part)
+				}
+				else {
+					for flag in auto_complete_flags {
+						if flag == part {
+							if flag == '-cc' { // 'v -cc <tab>' -> list of available compilers.
+								for compiler in auto_complete_compilers {
+									path := os.find_abs_path_of_executable(compiler) or { '' }
+									if path != '' {
+										list << compiler
+									}
+								}
+							}
+						} else if flag.starts_with(part) { // 'v -<char(s)><tab>' -> flags matching "<char(s)>".
+							list << flag
+						}
+					}
+				}
+			}
+		} else {
+			match part {
+				'help' { // 'v help <tab>' -> top level commands except "help".
+					list = auto_complete_commands.filter(it != part && it != 'complete')
+				}
+				else {
+					// 'v <char(s)><tab>' -> commands matching "<char(s)>".
+					// Don't include if part matches a full command - instead go to path completion below.
+					for command in auto_complete_commands {
+						if part != command && command.starts_with(part) {
+							list << command
+						}
+					}
+				}
+			}
+		}
+		// Nothing of value was found.
+		// Mimic shell dir and file completion
+		if list.len == 0 {
+			mut ls_path := '.'
+			mut collect_all := part in auto_complete_commands
+			mut path_complete := false
+			if part.ends_with(os.path_separator) || part == '.' || part == '..' {
+				// 'v <command>(.*/$|.|..)<tab>' -> output full directory list
+				ls_path = '.' + os.path_separator + part
+				collect_all = true
+			} else if !collect_all && part.contains(os.path_separator) && os.is_dir(os.dir(part)) {
+				// 'v <command>(.*/.* && os.is_dir)<tab>'  -> output completion friendly directory list
+				ls_path = os.dir(part)
+				path_complete = true
+			}
+			entries := os.ls(ls_path) or { return list }
+			last := part.all_after_last(os.path_separator)
+			if path_complete {
+				path := part.all_before_last(os.path_separator)
+				for entry in entries {
+					if entry.starts_with(last) {
+						list << append_separator_if_dir(os.join_path(path, entry))
+					}
+				}
+				// If only one possible file - send full path to completion system.
+				// Please note that this might be bash specific - needs more testing.
+				if list.len == 1 {
+					list = [list[0]]
+				}
+			} else {
+				for entry in entries {
+					if collect_all {
+						list << append_separator_if_dir(entry)
+					} else {
+						if entry.starts_with(last) {
+							list << append_separator_if_dir(entry)
+						}
+					}
+				}
+			}
+		}
+	}
+	return list
+}
+
+fn main() {
+	args := os.args[1..]
+	// println('"$args"')
+	auto_complete(args)
+}
diff --git a/v_windows/v/cmd/tools/vcreate.v b/v_windows/v/cmd/tools/vcreate.v
new file mode 100644
index 0000000..e147979
--- /dev/null
+++ b/v_windows/v/cmd/tools/vcreate.v
@@ -0,0 +1,186 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
+module main
+
+// This module follows a similar convention to Rust: `init` makes the
+// structure of the program in the _current_ directory, while `new`
+// makes the program structure in a _sub_ directory. Besides that, the
+// functionality is essentially the same.
+import os
+
+struct Create {
+mut:
+	name        string
+	description string
+	version     string
+	license     string
+}
+
+fn cerror(e string) {
+	eprintln('\nerror: $e')
+}
+
+fn check_name(name string) string {
+	if name.trim_space().len == 0 {
+		cerror('project name cannot be empty')
+		exit(1)
+	}
+	if name.is_title() {
+		mut cname := name.to_lower()
+		if cname.contains(' ') {
+			cname = cname.replace(' ', '_')
+		}
+		eprintln('warning: the project name cannot be capitalized, the name will be changed to `$cname`')
+		return cname
+	}
+	if name.contains(' ') {
+		cname := name.replace(' ', '_')
+		eprintln('warning: the project name cannot contain spaces, the name will be changed to `$cname`')
+		return cname
+	}
+	return name
+}
+
+fn vmod_content(c Create) string {
+	return [
+		'Module {',
+		"	name: '$c.name'",
+		"	description: '$c.description'",
+		"	version: '$c.version'",
+		"	license: '$c.license'",
+		'	dependencies: []',
+		'}',
+		'',
+	].join('\n')
+}
+
+fn main_content() string {
+	return [
+		'module main\n',
+		'fn main() {',
+		"	println('Hello World!')",
+		'}',
+		'',
+	].join('\n')
+}
+
+fn gen_gitignore(name string) string {
+	return [
+		'# Binaries for programs and plugins',
+		'main',
+		'$name',
+		'*.exe',
+		'*.exe~',
+		'*.so',
+		'*.dylib',
+		'*.dll',
+		'',
+	].join('\n')
+}
+
+fn (c &Create) write_vmod(new bool) {
+	vmod_path := if new { '$c.name/v.mod' } else { 'v.mod' }
+	mut vmod := os.create(vmod_path) or {
+		cerror(err.msg)
+		exit(1)
+	}
+	vmod.write_string(vmod_content(c)) or { panic(err) }
+	vmod.close()
+}
+
+fn (c &Create) write_main(new bool) {
+	if !new && (os.exists('${c.name}.v') || os.exists('src/${c.name}.v')) {
+		return
+	}
+	main_path := if new { '$c.name/${c.name}.v' } else { '${c.name}.v' }
+	mut mainfile := os.create(main_path) or {
+		cerror(err.msg)
+		exit(2)
+	}
+	mainfile.write_string(main_content()) or { panic(err) }
+	mainfile.close()
+}
+
+fn (c &Create) create_git_repo(dir string) {
+	// Create Git Repo and .gitignore file
+	if !os.is_dir('$dir/.git') {
+		res := os.execute('git init $dir')
+		if res.exit_code != 0 {
+			cerror('Unable to create git repo')
+			exit(4)
+		}
+	}
+	if !os.exists('$dir/.gitignore') {
+		mut fl := os.create('$dir/.gitignore') or {
+			// We don't really need a .gitignore, it's just a nice-to-have
+			return
+		}
+		fl.write_string(gen_gitignore(c.name)) or { panic(err) }
+		fl.close()
+	}
+}
+
+fn create(args []string) {
+	mut c := Create{}
+	c.name = check_name(if args.len > 0 { args[0] } else { os.input('Input your project name: ') })
+	if c.name == '' {
+		cerror('project name cannot be empty')
+		exit(1)
+	}
+	if c.name.contains('-') {
+		cerror('"$c.name" should not contain hyphens')
+		exit(1)
+	}
+	if os.is_dir(c.name) {
+		cerror('$c.name folder already exists')
+		exit(3)
+	}
+	c.description = if args.len > 1 { args[1] } else { os.input('Input your project description: ') }
+	default_version := '0.0.0'
+	c.version = os.input('Input your project version: ($default_version) ')
+	if c.version == '' {
+		c.version = default_version
+	}
+	default_license := 'MIT'
+	c.license = os.input('Input your project license: ($default_license) ')
+	if c.license == '' {
+		c.license = default_license
+	}
+	println('Initialising ...')
+	os.mkdir(c.name) or { panic(err) }
+	c.write_vmod(true)
+	c.write_main(true)
+	c.create_git_repo(c.name)
+}
+
+fn init_project() {
+	if os.exists('v.mod') {
+		cerror('`v init` cannot be run on existing v modules')
+		exit(3)
+	}
+	mut c := Create{}
+	c.name = check_name(os.file_name(os.getwd()))
+	c.description = ''
+	c.write_vmod(false)
+	c.write_main(false)
+	c.create_git_repo('.')
+
+	println('Change the description of your project in `v.mod`')
+}
+
+fn main() {
+	cmd := os.args[1]
+	match cmd {
+		'new' {
+			create(os.args[2..])
+		}
+		'init' {
+			init_project()
+		}
+		else {
+			cerror('unknown command: $cmd')
+			exit(1)
+		}
+	}
+	println('Complete!')
+}
diff --git a/v_windows/v/cmd/tools/vcreate_test.v b/v_windows/v/cmd/tools/vcreate_test.v
new file mode 100644
index 0000000..fd09616
--- /dev/null
+++ b/v_windows/v/cmd/tools/vcreate_test.v
@@ -0,0 +1,79 @@
+import os
+
+const test_path = 'vcreate_test'
+
+fn init_and_check() ? {
+	vexe := @VEXE
+	os.execute_or_exit('$vexe init')
+
+	assert os.read_file('vcreate_test.v') ? == [
+		'module main\n',
+		'fn main() {',
+		"	println('Hello World!')",
+		'}',
+		'',
+	].join('\n')
+
+	assert os.read_file('v.mod') ? == [
+		'Module {',
+		"	name: 'vcreate_test'",
+		"	description: ''",
+		"	version: ''",
+		"	license: ''",
+		'	dependencies: []',
+		'}',
+		'',
+	].join('\n')
+
+	assert os.read_file('.gitignore') ? == [
+		'# Binaries for programs and plugins',
+		'main',
+		'vcreate_test',
+		'*.exe',
+		'*.exe~',
+		'*.so',
+		'*.dylib',
+		'*.dll',
+		'',
+	].join('\n')
+}
+
+fn test_v_init() ? {
+	dir := os.join_path(os.temp_dir(), test_path)
+	os.rmdir_all(dir) or {}
+	os.mkdir(dir) or {}
+	defer {
+		os.rmdir_all(dir) or {}
+	}
+	os.chdir(dir) ?
+
+	init_and_check() ?
+}
+
+fn test_v_init_in_git_dir() ? {
+	dir := os.join_path(os.temp_dir(), test_path)
+	os.rmdir_all(dir) or {}
+	os.mkdir(dir) or {}
+	defer {
+		os.rmdir_all(dir) or {}
+	}
+	os.chdir(dir) ?
+	os.execute_or_exit('git init .')
+	init_and_check() ?
+}
+
+fn test_v_init_no_overwrite_gitignore() ? {
+	dir := os.join_path(os.temp_dir(), test_path)
+	os.rmdir_all(dir) or {}
+	os.mkdir(dir) or {}
+	os.write_file('$dir/.gitignore', 'blah') ?
+	defer {
+		os.rmdir_all(dir) or {}
+	}
+	os.chdir(dir) ?
+
+	vexe := @VEXE
+	os.execute_or_exit('$vexe init')
+
+	assert os.read_file('.gitignore') ? == 'blah'
+}
diff --git a/v_windows/v/cmd/tools/vdoc/html.v b/v_windows/v/cmd/tools/vdoc/html.v
new file mode 100644
index 0000000..e5a7f32
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/html.v
@@ -0,0 +1,554 @@
+module main
+
+import os
+import net.urllib
+import strings
+import markdown
+import regex
+import v.scanner
+import v.ast
+import v.token
+import v.doc
+import v.pref
+
+const (
+	css_js_assets = ['doc.css', 'normalize.css', 'doc.js', 'dark-mode.js']
+	res_path      = os.resource_abs_path('resources')
+	favicons_path = os.join_path(res_path, 'favicons')
+	link_svg      = '<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 0 24 24" width="24"><path d="M0 0h24v24H0z" fill="none"/><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"/></svg>'
+	html_content  = '<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta charset="UTF-8">
+		<meta http-equiv="x-ua-compatible" content="IE=edge" />
+		<meta name="viewport" content="width=device-width, initial-scale=1.0">
+		<title>{{ title }} | vdoc</title>
+		<link rel="preconnect" href="https://fonts.googleapis.com">
+		<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+		<link href="https://fonts.googleapis.com/css2?family=Jost:wght@300;400;500;600;700&display=swap" rel="stylesheet">
+		<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono&display=swap" rel="stylesheet">
+		<link rel="apple-touch-icon" sizes="180x180" href="apple-touch-icon.png">
+		<link rel="icon" type="image/png" sizes="32x32" href="favicon-32x32.png">
+		<link rel="icon" type="image/png" sizes="16x16" href="favicon-16x16.png">
+		<link rel="manifest" href="site.webmanifest">
+		<link rel="mask-icon" href="safari-pinned-tab.svg" color="#5bbad5">
+		<meta name="msapplication-TileColor" content="#da532c">
+		<meta name="theme-color" content="#ffffff">
+		{{ head_assets }}
+	</head>
+	<body>
+		<div id="page">
+			<header class="doc-nav hidden">
+				<div class="heading-container">
+					<div class="heading">
+						<div class="info">
+							<div class="module">{{ head_name }}</div>
+							<div class="toggle-version-container">
+								<span>{{ version }}</span>
+								<div id="dark-mode-toggle" role="switch" aria-checked="false" aria-label="Toggle dark mode">{{ light_icon }}{{ dark_icon }}</div>
+							</div>
+							{{ menu_icon }}
+						</div>
+						<input type="text" id="search" placeholder="Search... (beta)" autocomplete="off">
+					</div>
+				</div>
+				<nav class="search hidden"></nav>
+				<nav class="content hidden">
+					<ul>
+						{{ toc_links }}
+					</ul>
+				</nav>
+			</header>
+			<div class="doc-scrollview">
+				<div class="doc-container">
+					<div class="doc-content">
+{{ contents }}
+						<div class="footer">
+							{{ footer_content }}
+						</div>
+					</div>
+					{{ right_content }}
+				</div>
+			</div>
+		</div>
+		{{ footer_assets }}
+		<script async src="search_index.js" type="text/javascript"></script>
+	</body>
+</html>'
+)
+
+enum HighlightTokenTyp {
+	unone
+	boolean
+	builtin
+	char
+	comment
+	function
+	keyword
+	name
+	number
+	operator
+	punctuation
+	string
+	symbol
+	none_
+	module_
+	prefix
+}
+
+struct SearchModuleResult {
+	description string
+	link        string
+}
+
+struct SearchResult {
+	prefix      string
+	badge       string
+	description string
+	link        string
+}
+
+fn (vd VDoc) render_search_index(out Output) {
+	mut js_search_index := strings.new_builder(200)
+	mut js_search_data := strings.new_builder(200)
+	js_search_index.write_string('var searchModuleIndex = [')
+	js_search_data.write_string('var searchModuleData = [')
+	for i, title in vd.search_module_index {
+		data := vd.search_module_data[i]
+		js_search_index.write_string('"$title",')
+		js_search_data.write_string('["$data.description","$data.link"],')
+	}
+	js_search_index.writeln('];')
+	js_search_index.write_string('var searchIndex = [')
+	js_search_data.writeln('];')
+	js_search_data.write_string('var searchData = [')
+	for i, title in vd.search_index {
+		data := vd.search_data[i]
+		js_search_index.write_string('"$title",')
+		// array instead of object to reduce file size
+		js_search_data.write_string('["$data.badge","$data.description","$data.link","$data.prefix"],')
+	}
+	js_search_index.writeln('];')
+	js_search_data.writeln('];')
+	out_file_path := os.join_path(out.path, 'search_index.js')
+	os.write_file(out_file_path, js_search_index.str() + js_search_data.str()) or { panic(err) }
+}
+
+fn (mut vd VDoc) render_static_html(out Output) {
+	vd.assets = {
+		'doc_css':       vd.get_resource(css_js_assets[0], out)
+		'normalize_css': vd.get_resource(css_js_assets[1], out)
+		'doc_js':        vd.get_resource(css_js_assets[2], out)
+		'dark_mode_js':  vd.get_resource(css_js_assets[3], out)
+		'light_icon':    vd.get_resource('light.svg', out)
+		'dark_icon':     vd.get_resource('dark.svg', out)
+		'menu_icon':     vd.get_resource('menu.svg', out)
+		'arrow_icon':    vd.get_resource('arrow.svg', out)
+	}
+}
+
+fn (vd VDoc) get_resource(name string, out Output) string {
+	cfg := vd.cfg
+	path := os.join_path(res_path, name)
+	mut res := os.read_file(path) or { panic('vdoc: could not read $path') }
+	/*
+	if minify {
+		if name.ends_with('.js') {
+			res = js_compress(res)
+		} else {
+			res = res.split_into_lines().map(it.trim_space()).join('')
+		}
+	}
+	*/
+	// TODO: Make SVG inline for now
+	if cfg.inline_assets || path.ends_with('.svg') {
+		return res
+	} else {
+		output_path := os.join_path(out.path, name)
+		if !os.exists(output_path) {
+			println('Generating $out.typ in "$output_path"')
+			os.write_file(output_path, res) or { panic(err) }
+		}
+		return name
+	}
+}
+
+fn (mut vd VDoc) collect_search_index(out Output) {
+	cfg := vd.cfg
+	for doc in vd.docs {
+		mod := doc.head.name
+		vd.search_module_index << mod
+		comments := if cfg.include_examples {
+			doc.head.merge_comments()
+		} else {
+			doc.head.merge_comments_without_examples()
+		}
+		vd.search_module_data << SearchModuleResult{
+			description: trim_doc_node_description(comments)
+			link: vd.get_file_name(mod, out)
+		}
+		for _, dn in doc.contents {
+			vd.create_search_results(mod, dn, out)
+		}
+	}
+}
+
+fn (mut vd VDoc) create_search_results(mod string, dn doc.DocNode, out Output) {
+	cfg := vd.cfg
+	if dn.kind == .const_group {
+		return
+	}
+	comments := if cfg.include_examples {
+		dn.merge_comments()
+	} else {
+		dn.merge_comments_without_examples()
+	}
+	dn_description := trim_doc_node_description(comments)
+	vd.search_index << dn.name
+	vd.search_data << SearchResult{
+		prefix: if dn.parent_name != '' { '$dn.kind ($dn.parent_name)' } else { '$dn.kind ' }
+		description: dn_description
+		badge: mod
+		link: vd.get_file_name(mod, out) + '#' + get_node_id(dn)
+	}
+	for child in dn.children {
+		vd.create_search_results(mod, child, out)
+	}
+}
+
+fn (vd VDoc) write_content(cn &doc.DocNode, d &doc.Doc, mut hw strings.Builder) {
+	cfg := vd.cfg
+	base_dir := os.dir(os.real_path(cfg.input_path))
+	file_path_name := if cfg.is_multi {
+		cn.file_path.replace('$base_dir/', '')
+	} else {
+		os.file_name(cn.file_path)
+	}
+	src_link := get_src_link(vd.manifest.repo_url, file_path_name, cn.pos.line_nr + 1)
+	if cn.content.len != 0 || (cn.name == 'Constants') {
+		hw.write_string(doc_node_html(cn, src_link, false, cfg.include_examples, d.table))
+	}
+	for child in cn.children {
+		child_file_path_name := child.file_path.replace('$base_dir/', '')
+		child_src_link := get_src_link(vd.manifest.repo_url, child_file_path_name,
+			child.pos.line_nr + 1)
+		hw.write_string(doc_node_html(child, child_src_link, false, cfg.include_examples,
+			d.table))
+	}
+}
+
+fn (vd VDoc) gen_html(d doc.Doc) string {
+	cfg := vd.cfg
+	mut symbols_toc := strings.new_builder(200)
+	mut modules_toc := strings.new_builder(200)
+	mut contents := strings.new_builder(200)
+	dcs_contents := d.contents.arr()
+	// generate toc first
+	contents.writeln(doc_node_html(d.head, '', true, cfg.include_examples, d.table))
+	if is_module_readme(d.head) {
+		write_toc(d.head, mut symbols_toc)
+	}
+	for cn in dcs_contents {
+		vd.write_content(&cn, &d, mut contents)
+		write_toc(cn, mut symbols_toc)
+	} // write head
+	// write css
+	version := if vd.manifest.version.len != 0 { vd.manifest.version } else { '' }
+	header_name := if cfg.is_multi && vd.docs.len > 1 {
+		os.file_name(os.real_path(cfg.input_path))
+	} else {
+		d.head.name
+	}
+	// write nav1
+	if cfg.is_multi || vd.docs.len > 1 {
+		mut submod_prefix := ''
+		for i, dc in vd.docs {
+			if i - 1 >= 0 && dc.head.name.starts_with(submod_prefix + '.') {
+				continue
+			}
+			names := dc.head.name.split('.')
+			submod_prefix = if names.len > 1 { names[0] } else { dc.head.name }
+			mut href_name := './${dc.head.name}.html'
+			if (cfg.is_vlib && dc.head.name == 'builtin' && !cfg.include_readme)
+				|| dc.head.name == 'README' {
+				href_name = './index.html'
+			} else if submod_prefix !in vd.docs.map(it.head.name) {
+				href_name = '#'
+			}
+			submodules := vd.docs.filter(it.head.name.starts_with(submod_prefix + '.'))
+			dropdown := if submodules.len > 0 { vd.assets['arrow_icon'] } else { '' }
+			active_class := if dc.head.name == d.head.name { ' active' } else { '' }
+			modules_toc.write_string('<li class="open$active_class"><div class="menu-row">$dropdown<a href="$href_name">$submod_prefix</a></div>')
+			for j, cdoc in submodules {
+				if j == 0 {
+					modules_toc.write_string('<ul>')
+				}
+				submod_name := cdoc.head.name.all_after(submod_prefix + '.')
+				sub_selected_classes := if cdoc.head.name == d.head.name {
+					' class="active"'
+				} else {
+					''
+				}
+				modules_toc.write_string('<li$sub_selected_classes><a href="./${cdoc.head.name}.html">$submod_name</a></li>')
+				if j == submodules.len - 1 {
+					modules_toc.write_string('</ul>')
+				}
+			}
+			modules_toc.write_string('</li>')
+		}
+	}
+	modules_toc_str := modules_toc.str()
+	symbols_toc_str := symbols_toc.str()
+	result := html_content.replace('{{ title }}', d.head.name).replace('{{ head_name }}',
+		header_name).replace('{{ version }}', version).replace('{{ light_icon }}', vd.assets['light_icon']).replace('{{ dark_icon }}',
+		vd.assets['dark_icon']).replace('{{ menu_icon }}', vd.assets['menu_icon']).replace('{{ head_assets }}',
+		if cfg.inline_assets {
+		'\n${tabs[0]}<style>' + vd.assets['doc_css'] + '</style>\n${tabs[0]}<style>' +
+			vd.assets['normalize_css'] + '</style>\n${tabs[0]}<script>' +
+			vd.assets['dark_mode_js'] + '</script>'
+	} else {
+		'\n${tabs[0]}<link rel="stylesheet" href="' + vd.assets['doc_css'] +
+			'" />\n${tabs[0]}<link rel="stylesheet" href="' + vd.assets['normalize_css'] +
+			'" />\n${tabs[0]}<script src="' + vd.assets['dark_mode_js'] + '"></script>'
+	}).replace('{{ toc_links }}', if cfg.is_multi || vd.docs.len > 1 {
+		modules_toc_str
+	} else {
+		symbols_toc_str
+	}).replace('{{ contents }}', contents.str()).replace('{{ right_content }}', if cfg.is_multi
+		&& vd.docs.len > 1 && d.head.name != 'README' {
+		'<div class="doc-toc"><ul>' + symbols_toc_str + '</ul></div>'
+	} else {
+		''
+	}).replace('{{ footer_content }}', gen_footer_text(d, !cfg.no_timestamp)).replace('{{ footer_assets }}',
+		if cfg.inline_assets {
+		'<script>' + vd.assets['doc_js'] + '</script>'
+	} else {
+		'<script src="' + vd.assets['doc_js'] + '"></script>'
+	})
+	return result
+}
+
+fn get_src_link(repo_url string, file_name string, line_nr int) string {
+	mut url := urllib.parse(repo_url) or { return '' }
+	if url.path.len <= 1 || file_name.len == 0 {
+		return ''
+	}
+	url.path = url.path.trim_right('/') + match url.host {
+		'github.com' { '/blob/master/$file_name' }
+		'gitlab.com' { '/-/blob/master/$file_name' }
+		'git.sir.ht' { '/tree/master/$file_name' }
+		else { '' }
+	}
+	if url.path == '/' {
+		return ''
+	}
+	url.fragment = 'L$line_nr'
+	return url.str()
+}
+
+fn html_highlight(code string, tb &ast.Table) string {
+	builtin := ['bool', 'string', 'i8', 'i16', 'int', 'i64', 'i128', 'byte', 'u16', 'u32', 'u64',
+		'u128', 'rune', 'f32', 'f64', 'int_literal', 'float_literal', 'byteptr', 'voidptr', 'any']
+	highlight_code := fn (tok token.Token, typ HighlightTokenTyp) string {
+		lit := if typ in [.unone, .operator, .punctuation] {
+			tok.kind.str()
+		} else if typ == .string {
+			"'$tok.lit'"
+		} else if typ == .char {
+			'`$tok.lit`'
+		} else {
+			tok.lit
+		}
+		if typ in [.unone, .name] {
+			return lit
+		}
+		return '<span class="token $typ">$lit</span>'
+	}
+	mut s := scanner.new_scanner(code, .parse_comments, &pref.Preferences{})
+	mut tok := s.scan()
+	mut next_tok := s.scan()
+	mut buf := strings.new_builder(200)
+	mut i := 0
+	for i < code.len {
+		if i == tok.pos {
+			mut tok_typ := HighlightTokenTyp.unone
+			match tok.kind {
+				.name {
+					if tok.lit in builtin || tb.known_type(tok.lit) {
+						tok_typ = .builtin
+					} else if next_tok.kind == .lcbr {
+						tok_typ = .symbol
+					} else if next_tok.kind == .lpar {
+						tok_typ = .function
+					} else {
+						tok_typ = .name
+					}
+				}
+				.comment {
+					tok_typ = .comment
+				}
+				.chartoken {
+					tok_typ = .char
+				}
+				.string {
+					tok_typ = .string
+				}
+				.number {
+					tok_typ = .number
+				}
+				.key_true, .key_false {
+					tok_typ = .boolean
+				}
+				.lpar, .lcbr, .rpar, .rcbr, .lsbr, .rsbr, .semicolon, .colon, .comma, .dot {
+					tok_typ = .punctuation
+				}
+				else {
+					if token.is_key(tok.lit) || token.is_decl(tok.kind) {
+						tok_typ = .keyword
+					} else if tok.kind == .decl_assign || tok.kind.is_assign() || tok.is_unary()
+						|| tok.kind.is_relational() || tok.kind.is_infix() {
+						tok_typ = .operator
+					}
+				}
+			}
+			buf.write_string(highlight_code(tok, tok_typ))
+			if next_tok.kind != .eof {
+				i = tok.pos + tok.len
+				tok = next_tok
+				next_tok = s.scan()
+			} else {
+				break
+			}
+		} else {
+			buf.write_b(code[i])
+			i++
+		}
+	}
+	return buf.str()
+}
+
+fn doc_node_html(dn doc.DocNode, link string, head bool, include_examples bool, tb &ast.Table) string {
+	mut dnw := strings.new_builder(200)
+	head_tag := if head { 'h1' } else { 'h2' }
+	comments := dn.merge_comments_without_examples()
+	// Allow README.md to go through unescaped except for script tags
+	escaped_html := if head && is_module_readme(dn) {
+		// Strip markdown [TOC] directives, since we generate our own.
+		stripped := comments.replace('[TOC]', '')
+		markdown_escape_script_tags(stripped)
+	} else {
+		html_tag_escape(comments)
+	}
+	md_content := markdown.to_html(escaped_html)
+	highlighted_code := html_highlight(dn.content, tb)
+	node_class := if dn.kind == .const_group { ' const' } else { '' }
+	sym_name := get_sym_name(dn)
+	has_deprecated := 'deprecated' in dn.tags
+	mut tags := dn.tags.filter(it != 'deprecated')
+	tags.sort()
+	mut node_id := get_node_id(dn)
+	mut hash_link := if !head { ' <a href="#$node_id">#</a>' } else { '' }
+	if head && is_module_readme(dn) {
+		node_id = 'readme_$node_id'
+		hash_link = ' <a href="#$node_id">#</a>'
+	}
+	dnw.writeln('${tabs[1]}<section id="$node_id" class="doc-node$node_class">')
+	if dn.name.len > 0 {
+		if dn.kind == .const_group {
+			dnw.write_string('${tabs[2]}<div class="title"><$head_tag>$sym_name$hash_link</$head_tag>')
+		} else {
+			dnw.write_string('${tabs[2]}<div class="title"><$head_tag>$dn.kind $sym_name$hash_link</$head_tag>')
+		}
+		if link.len != 0 {
+			dnw.write_string('<a class="link" rel="noreferrer" target="_blank" href="$link">$link_svg</a>')
+		}
+		dnw.write_string('</div>')
+	}
+	if tags.len > 0 || has_deprecated {
+		mut attributes := if has_deprecated {
+			'<div class="attribute attribute-deprecated">deprecated</div>'
+		} else {
+			''
+		}
+		attributes += tags.map('<div class="attribute">$it</div>').join('')
+		dnw.writeln('<div class="attributes">$attributes</div>')
+	}
+	if !head && dn.content.len > 0 {
+		dnw.writeln('<pre class="signature"><code>$highlighted_code</code></pre>')
+	}
+	// do not mess with md_content further, its formatting is important, just output it 1:1 !
+	dnw.writeln('$md_content\n')
+	// Write examples if any found
+	examples := dn.examples()
+	if include_examples && examples.len > 0 {
+		example_title := if examples.len > 1 { 'Examples' } else { 'Example' }
+		dnw.writeln('<section class="doc-node examples"><h4>$example_title</h4>')
+		for example in examples {
+			// hl_example := html_highlight(example, tb)
+			dnw.writeln('<pre><code class="language-v">$example</code></pre>')
+		}
+		dnw.writeln('</section>')
+	}
+	dnw.writeln('</section>')
+	dnw_str := dnw.str()
+	return dnw_str
+}
+
+fn html_tag_escape(str string) string {
+	excaped_string := str.replace_each(['<', '&lt;', '>', '&gt;'])
+	mut re := regex.regex_opt(r'`.+[(&lt;)(&gt;)].+`') or { regex.RE{} }
+	if re.find_all_str(excaped_string).len > 0 {
+		return str
+	}
+	return excaped_string
+}
+
+/*
+fn js_compress(str string) string {
+	mut js := strings.new_builder(200)
+	lines := str.split_into_lines()
+	rules := [') {', ' = ', ', ', '{ ', ' }', ' (', '; ', ' + ', ' < ', ' - ', ' || ', ' var',
+		': ', ' >= ', ' && ', ' else if', ' === ', ' !== ', ' else ']
+	clean := ['){', '=', ',', '{', '}', '(', ';', '+', '<', '-', '||', 'var', ':', '>=', '&&',
+		'else if', '===', '!==', 'else']
+	for line in lines {
+		mut trimmed := line.trim_space()
+		if trimmed.starts_with('//') || (trimmed.starts_with('/*') && trimmed.ends_with('*/')) {
+			continue
+		}
+		for i in 0 .. rules.len - 1 {
+			trimmed = trimmed.replace(rules[i], clean[i])
+		}
+		js.write_string(trimmed)
+	}
+	js_str := js.str()
+	return js_str
+}
+*/
+fn write_toc(dn doc.DocNode, mut toc strings.Builder) {
+	mut toc_slug := if dn.name.len == 0 || dn.content.len == 0 { '' } else { slug(dn.name) }
+	if toc_slug == '' && dn.children.len > 0 {
+		if dn.children[0].name == '' {
+			toc_slug = slug(dn.name)
+		} else {
+			toc_slug = slug(dn.name + '.' + dn.children[0].name)
+		}
+	}
+	if is_module_readme(dn) {
+		if dn.comments.len == 0 || (dn.comments.len > 0 && dn.comments[0].text.len == 0) {
+			return
+		}
+		toc.write_string('<li class="open"><a href="#readme_$toc_slug">README</a>')
+	} else if dn.name != 'Constants' {
+		toc.write_string('<li class="open"><a href="#$toc_slug">$dn.kind $dn.name</a>')
+		toc.writeln('        <ul>')
+		for child in dn.children {
+			cname := dn.name + '.' + child.name
+			toc.writeln('<li><a href="#${slug(cname)}">$child.kind $child.name</a></li>')
+		}
+		toc.writeln('</ul>')
+	} else {
+		toc.write_string('<li class="open"><a href="#$toc_slug">$dn.name</a>')
+	}
+	toc.writeln('</li>')
+}
diff --git a/v_windows/v/cmd/tools/vdoc/html_tag_escape_test.v b/v_windows/v/cmd/tools/vdoc/html_tag_escape_test.v
new file mode 100644
index 0000000..64a7d1c
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/html_tag_escape_test.v
@@ -0,0 +1,6 @@
+module main
+
+fn test_html_tag_escape() {
+	assert html_tag_escape('<abc>') == '&lt;abc&gt;'
+	assert html_tag_escape('`<abc>`') == '`<abc>`'
+}
diff --git a/v_windows/v/cmd/tools/vdoc/markdown.v b/v_windows/v/cmd/tools/vdoc/markdown.v
new file mode 100644
index 0000000..cc24ad2
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/markdown.v
@@ -0,0 +1,55 @@
+module main
+
+import strings
+import v.doc
+
+fn markdown_escape_script_tags(str string) string {
+	return str.replace_each(['<script>', '`', '</script>', '`'])
+}
+
+fn (vd VDoc) gen_markdown(d doc.Doc, with_toc bool) string {
+	mut hw := strings.new_builder(200)
+	mut cw := strings.new_builder(200)
+	hw.writeln('# $d.head.content\n')
+	if d.head.comments.len > 0 {
+		comments := if vd.cfg.include_examples {
+			d.head.merge_comments()
+		} else {
+			d.head.merge_comments_without_examples()
+		}
+		hw.writeln('$comments\n')
+	}
+	if with_toc {
+		hw.writeln('## Contents')
+	}
+	vd.write_markdown_content(d.contents.arr(), mut cw, mut hw, 0, with_toc)
+	footer_text := gen_footer_text(d, !vd.cfg.no_timestamp)
+	cw.writeln('#### $footer_text')
+	return hw.str() + '\n' + cw.str()
+}
+
+fn (vd VDoc) write_markdown_content(contents []doc.DocNode, mut cw strings.Builder, mut hw strings.Builder, indent int, with_toc bool) {
+	for cn in contents {
+		if with_toc && cn.name.len > 0 {
+			hw.writeln(' '.repeat(2 * indent) + '- [${slug(cn.name)}](#$cn.name)')
+			cw.writeln('## $cn.name')
+		}
+		if cn.content.len > 0 {
+			comments := cn.merge_comments_without_examples()
+			cw.writeln('```v\n$cn.content\n```\n$comments\n')
+			// Write examples if any found
+			examples := cn.examples()
+			if vd.cfg.include_examples && examples.len > 0 {
+				example_title := if examples.len > 1 { 'Examples' } else { 'Example' }
+				cw.writeln('$example_title\n```v\n')
+				for example in examples {
+					cw.writeln('$example\n')
+				}
+				cw.writeln('```\n')
+			}
+			cw.writeln(r'[[Return to contents]](#Contents)')
+			cw.writeln('')
+		}
+		vd.write_markdown_content(cn.children, mut cw, mut hw, indent + 1, with_toc)
+	}
+}
diff --git a/v_windows/v/cmd/tools/vdoc/resources/arrow.svg b/v_windows/v/cmd/tools/vdoc/resources/arrow.svg
new file mode 100644
index 0000000..2a0456f
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/arrow.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="dropdown-arrow" height="24" viewBox="0 0 24 24" width="24"><path d="M0 0h24v24H0z" fill="none"/><path d="M7 10l5 5 5-5z"/></svg>
\ No newline at end of file
diff --git a/v_windows/v/cmd/tools/vdoc/resources/dark-mode.js b/v_windows/v/cmd/tools/vdoc/resources/dark-mode.js
new file mode 100644
index 0000000..075dbb5
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/dark-mode.js
@@ -0,0 +1,6 @@
+(function() {
+    var html = document.getElementsByTagName('html')[0];
+    if (localStorage.getItem('dark-mode') === 'true') {
+        html.classList.add('dark');
+    }
+})();
diff --git a/v_windows/v/cmd/tools/vdoc/resources/dark.svg b/v_windows/v/cmd/tools/vdoc/resources/dark.svg
new file mode 100644
index 0000000..2067d05
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/dark.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="dark-icon" enable-background="new 0 0 24 24" height="24" viewBox="0 0 24 24" width="24"><g><rect fill="none" height="24" width="24"/></g><g><g><g><path d="M11.1,12.08C8.77,7.57,10.6,3.6,11.63,2.01C6.27,2.2,1.98,6.59,1.98,12c0,0.14,0.02,0.28,0.02,0.42 C2.62,12.15,3.29,12,4,12c1.66,0,3.18,0.83,4.1,2.15C9.77,14.63,11,16.17,11,18c0,1.52-0.87,2.83-2.12,3.51 c0.98,0.32,2.03,0.5,3.11,0.5c3.5,0,6.58-1.8,8.37-4.52C18,17.72,13.38,16.52,11.1,12.08z"/></g><path d="M7,16l-0.18,0C6.4,14.84,5.3,14,4,14c-1.66,0-3,1.34-3,3s1.34,3,3,3c0.62,0,2.49,0,3,0c1.1,0,2-0.9,2-2 C9,16.9,8.1,16,7,16z"/></g></g></svg>
diff --git a/v_windows/v/cmd/tools/vdoc/resources/doc.css b/v_windows/v/cmd/tools/vdoc/resources/doc.css
new file mode 100644
index 0000000..5f7058e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/doc.css
@@ -0,0 +1,732 @@
+:root {
+  --background-color: #fff;
+  --link-color: #2779bd;
+  --text-color: #000;
+  --ref-symbol-color: #dae1e7;
+  --ref-symbol-hover-color: #b8c2cc;
+  --title-bottom-line-color: #f1f5f8;
+  --footer-top-line-color: #f1f5f8;
+  --footer-text-color: #616161;
+  --code-signature-border-color: #a0aec0;
+  --menu-background-color: #4b6c88;
+  --menu-text-color: #fff;
+  --menu-indent-line-color: #3b3b3b66;
+  --menu-indent-line-active-color: #00000066;
+  --menu-scrollbar-color: #a0aec0;
+  --menu-toggle-icon-color: #fff;
+  --menu-toggle-icon-hover-color: #00000044;
+  --menu-search-background-color: #00000044;
+  --menu-search-font-color: #fff;
+  --menu-search-result-background-hover-color: #00000021;
+  --menu-search-separator-color: #00000044;
+  --menu-search-title-text-color: #d5efff;
+  --menu-search-badge-background-color: #00000044;
+  --menu-search-badge-background-hover-color: #0000004d;
+  --toc-text-color: #2779bd;
+  --toc-indicator-color: #4299e1;
+  --code-default-text-color: #5c6e74;
+  --code-background-color: #edf2f7;
+  --code-keyword-text-color: #2b6cb0;
+  --code-builtin-text-color: #0a0a0a;
+  --code-function-text-color: #319795;
+  --code-comment-text-color: #93a1a1;
+  --code-punctuation-text-color: #999999;
+  --code-symbol-text-color: #702459;
+  --code-operator-text-color: #a67f59;
+  --attribute-deprecated-background-color: #f59f0b48;
+  --attribute-deprecated-text-color: #92400e;
+  --attribute-text-color: #000000af;
+}
+:root.dark .dark-icon {
+  display: none;
+}
+:root:not(.dark) .light-icon {
+  display: none;
+}
+
+.dark body {
+  --background-color: #1a202c;
+  --text-color: #fff;
+  --link-color: #90cdf4;
+  --ref-symbol-color: #2d3748;
+  --ref-symbol-hover-color: #4a5568;
+  --title-bottom-line-color: #2d3748;
+  --footer-top-line-color: #2d3748;
+  --footer-text-color: #bbd3e1;
+  --code-signature-border-color: #4a5568;
+  --menu-background-color: #2d3748;
+  --menu-text-color: #fff;
+  --menu-indent-line-color: #4a5568;
+  --menu-indent-line-active-color: #90cdf4; /*#4a5568*/
+  --menu-scrollbar-color: #4a5568;
+  --menu-toggle-icon-color: #fff;
+  --menu-search-background-color: #4a5568;
+  --menu-search-font-color: #fff;
+  --menu-search-separator-color: #4a5568;
+  --menu-search-title-text-color: #90cdf4;
+  --menu-search-badge-background-color: #4a5568;
+  --menu-search-badge-background-hover-color: #4a5568;
+  --toc-text-color: #90cdf4;
+  --toc-indicator-color: #4299e1;
+  --code-default-text-color: #cbd5e0;
+  --code-background-color: #2d3748;
+  --code-builtin-text-color: #68d391;
+  --code-keyword-text-color: #63b3ed;
+  --code-function-text-color: #4fd1c5;
+  --code-comment-text-color: #a0aec0;
+  --code-punctuation-text-color: #a0aec0;
+  --code-symbol-text-color: #ed64a6;
+  --attribute-background-color: #ffffff20;
+  --attribute-text-color: #ffffffaf;
+  --attribute-deprecated-text-color: #fef3c7;
+}
+html {
+  height: 100%;
+}
+body {
+  margin: 0;
+  font-family: Jost, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica,
+    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  background-color: #fff;
+  background-color: var(--background-color);
+  color: #000;
+  color: var(--text-color);
+  height: 100%;
+}
+#page {
+  height: 100%;
+  padding-top: 56px;
+  box-sizing: border-box;
+  overflow: hidden;
+}
+
+/** Reset for menus */
+.doc-nav ul,
+.doc-toc ul {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+/* Left nav */
+.doc-nav {
+  position: fixed;
+  width: 100%;
+  left: 0;
+  right: 0;
+  top: 0;
+  display: flex;
+  background-color: #4b6c88;
+  background-color: var(--menu-background-color);
+  color: #fff;
+  color: var(--menu-text-color);
+  flex-direction: column;
+  overflow-y: auto;
+  height: 100vh;
+  z-index: 10;
+  scrollbar-width: thin;
+  scrollbar-color: #a0aec0 transparent;
+  scrollbar-color: var(--menu-scrollbar-color) transparent;
+  font-family: Jost, sans-serif;
+}
+*::-webkit-scrollbar {
+  width: 4px;
+  height: 4px;
+}
+*::-webkit-scrollbar-track {
+  background: transparent;
+}
+*::-webkit-scrollbar-thumb {
+  background-color: #a0aec0;
+  background-color: var(--menu-scrollbar-color);
+  border: 3px solid transparent;
+}
+.doc-nav .content li {
+  line-height: 1.8;
+}
+.doc-nav .content.show {
+  display: flex;
+}
+.doc-nav .content.hidden {
+  display: none;
+}
+.doc-nav #toggle-menu {
+  cursor: pointer;
+  padding: 0.3rem;
+  fill: #fff;
+  fill: var(--menu-toggle-icon-color);
+}
+.doc-nav > .heading-container {
+  position: relative;
+  /* IE11 */
+  position: sticky;
+  position: -webkit-sticky;
+  top: 0;
+  background-color: #4b6c88;
+  background-color: var(--menu-background-color);
+  z-index: 10;
+}
+.doc-nav > .heading-container > .heading {
+  display: flex;
+  flex-direction: column;
+}
+.doc-nav > .heading-container > .heading > .info {
+  display: flex;
+  padding: 0 1rem;
+  height: 56px;
+}
+.doc-nav > .heading-container > .heading > .info > .module {
+  font-size: 1.6rem;
+  font-weight: 500;
+  margin: 0;
+}
+.doc-nav > .heading-container > .heading > .info > .toggle-version-container {
+  display: flex;
+  align-items: center;
+}
+.doc-nav
+  > .heading-container
+  > .heading
+  > .info
+  > .toggle-version-container
+  > #dark-mode-toggle {
+  cursor: pointer;
+  fill: #fff;
+  display: flex;
+  visibility: hidden;
+}
+.doc-nav
+  > .heading-container
+  > .heading
+  > .info
+  > .toggle-version-container
+  > #dark-mode-toggle
+  > svg {
+  width: 1.2rem;
+  height: 1.2rem;
+}
+.doc-nav > .heading-container > .heading > #search {
+  margin: 0.6rem 1.2rem 1rem 1.2rem;
+  border: none;
+  border-radius: 0.2rem;
+  padding: 0.5rem 1rem;
+  outline: none;
+  background-color: #00000044;
+  background-color: var(--menu-search-background-color);
+  color: #fff;
+  color: var(--menu-search-text-color);
+}
+.doc-nav > .heading-container > .heading > #search::placeholder {
+  color: #edf2f7;
+  text-transform: uppercase;
+  font-size: 12px;
+  font-weight: 600;
+}
+.doc-nav > .heading-container > .heading > #search:-ms-input-placeholder {
+  color: #edf2f7;
+  text-transform: uppercase;
+  font-size: 12px;
+  font-weight: 600;
+}
+.doc-nav > .content {
+  padding: 0 2rem 2rem 2rem;
+  display: flex;
+  flex-direction: column;
+}
+.doc-nav > .content > ul > li.active {
+  font-weight: 600;
+}
+.doc-nav > .content > ul > li.open ul {
+  display: initial;
+}
+.doc-nav > .content > ul > li.open > .menu-row > .dropdown-arrow {
+  transform: initial;
+}
+.doc-nav > .content > ul > li > .menu-row {
+  display: flex;
+  align-items: center;
+}
+.doc-nav > .content > ul > li > .menu-row > .dropdown-arrow {
+  transform: rotate(-90deg);
+  height: 18px;
+  width: 18px;
+  margin-left: calc(-18px - 0.3rem);
+  margin-right: 0.3rem;
+  cursor: pointer;
+  fill: #fff;
+  pointer-events: all;
+}
+.doc-nav > .content > ul > li > ul {
+  margin: 0.4rem 0;
+  display: none;
+}
+.doc-nav > .content > ul > li > ul > li {
+  border-color: #ffffff66;
+  border-color: var(--menu-indent-line-color);
+  border-left-width: 1.7px;
+  border-left-style: solid;
+  padding-left: 0.7rem;
+}
+.doc-nav > .content > ul > li > ul > li.active {
+  border-color: #00000066;
+  border-color: var(--menu-search-result-hover-background-color);
+}
+.doc-nav > .content a {
+  color: #fff;
+  color: var(--menu-text-color);
+  text-decoration: none;
+  user-select: none;
+}
+.doc-nav > .content a:hover {
+  text-decoration: underline;
+}
+.doc-nav .search.hidden {
+  display: none;
+}
+.doc-nav .search li {
+  line-height: 1.5;
+}
+.doc-nav > .search .result:hover {
+  background-color: #00000021;
+  background-color: var(--menu-search-result-background-hover-color);
+}
+.doc-nav > .search .result:hover > .link > .definition > .badge {
+  background-color: #0000004d;
+  background-color: var(--menu-search-badge-background-hover-color);
+}
+.doc-nav > .search .result > .link {
+  padding: 0.5rem 1.4rem;
+  text-decoration: none;
+  color: #fff;
+  color: var(--menu-text-color);
+  display: block;
+}
+.doc-nav > .search .result > .link > .definition {
+  display: flex;
+}
+.doc-nav > .search .result > .link > .definition > .title {
+  color: #90cdf4;
+  color: var(--menu-search-title-text-color);
+  font-size: 0.875rem;
+  font-weight: 500;
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
+.doc-nav > .search .result > .link > .definition > .badge {
+  font-size: 0.75rem;
+  display: inline-flex;
+  padding: 0 0.5rem;
+  background-color: #00000044;
+  background-color: var(--menu-search-badge-background-color);
+  margin-left: auto;
+  align-items: center;
+  border-radius: 9999px;
+  font-weight: 500;
+}
+.doc-nav > .search .result > .link > .description {
+  font-family: Jost, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica,
+    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-size: 0.75rem;
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+  margin-top: 0.25rem;
+}
+.doc-nav > .search > hr.separator {
+  margin: 0.5rem 0;
+  border-color: #00000044;
+  border-color: var(--menu-search-separator-color);
+  box-sizing: content-box;
+  height: 0;
+  border-width: 0;
+  border-top-width: 1px;
+  border-style: solid;
+  overflow: visible;
+}
+
+/* Main content */
+.doc-scrollview {
+  height: 100%;
+  overflow-y: scroll;
+}
+.doc-container {
+  display: flex;
+  flex-direction: column-reverse;
+}
+.doc-content {
+  display: flex;
+  flex-direction: column;
+  padding: 1rem;
+  overflow: hidden;
+}
+.doc-content img {
+  width: auto;
+  max-width: 100%;
+}
+.doc-content p {
+  font-size: 1rem;
+  line-height: 1.6;
+  letter-spacing: 0.025em;
+}
+.doc-content a {
+  color: #2779bd;
+  color: var(--link-color);
+}
+.doc-content p code {
+  font-size: 0.85rem;
+}
+.doc-content > .doc-node {
+  padding: 5rem 0 2rem 0;
+  margin-top: -4rem;
+  overflow: hidden;
+  word-break: break-all; /* IE11 */
+  word-break: break-word;
+}
+.doc-content > .doc-node.const:nth-child(2) {
+  padding-bottom: 0 !important;
+}
+.doc-content > .doc-node.const:not(:first-child) {
+  padding-top: 4rem;
+}
+.doc-content > .doc-node.const:not(:last-child) {
+  padding-bottom: 2rem;
+}
+.doc-content > .timestamp {
+  font-size: 0.8rem;
+  color: #b8c2cc;
+  color: var(--timestamp-color);
+}
+.doc-content > .doc-node > .title {
+  display: flex;
+  font-family: Jost, sans-serif;
+  font-weight: 500;
+  padding: 0.3rem;
+  align-items: center;
+  margin-bottom: 1rem;
+  border-bottom: 1px solid #f1f5f8;
+  border-bottom: 1px solid var(--title-bottom-line-color);
+}
+.doc-content > .doc-node > .attributes {
+  margin-bottom: 0.6rem;
+}
+.doc-content > .doc-node > .attributes > .attribute {
+  display: inline-block;
+  border-radius: 100px;
+  padding: 0.3rem 0.6rem;
+  background-color: var(--code-background-color);
+  color: var(--attribute-text-color);
+  margin-right: 0.8rem;
+}
+.doc-content > .doc-node > .attributes > .attribute-deprecated {
+  background-color: var(--attribute-deprecated-background-color);
+  color: var(--attribute-deprecated-text-color);
+}
+.doc-content > .doc-node > .title > .link {
+  display: flex;
+  margin-left: auto;
+  fill: #dae1e7;
+  fill: var(--ref-symbol-color);
+}
+.doc-content > .doc-node > .title > .link:hover {
+  fill: #b8c2cc;
+  fill: var(--ref-symbol-hover-color);
+}
+.doc-content > .doc-node h1 {
+  font-size: 2rem;
+}
+.doc-content > .doc-node h2 {
+  font-size: 1.3rem;
+}
+.doc-content > .doc-node .signature {
+  border-color: #a0aec0;
+  border-color: var(--code-signature-border-color);
+  border-left-width: 3px;
+  border-left-style: solid;
+}
+.doc-content > .doc-node > ul > li .task-list-item-checkbox {
+  margin-right: 0.5rem;
+}
+.doc-content > .doc-node > .title h1,
+.doc-content > .doc-node > .title h2,
+.doc-content > .doc-node > .title h3,
+.doc-content > .doc-node > .title h4,
+.doc-content > .doc-node > .title h5,
+.doc-content > .doc-node > .title h6 {
+  font-weight: 500;
+  margin: 0;
+}
+.doc-content > .doc-node > .title h1 a,
+.doc-content > .doc-node > .title h2 a,
+.doc-content > .doc-node > .title h3 a,
+.doc-content > .doc-node > .title h4 a,
+.doc-content > .doc-node > .title h5 a,
+.doc-content > .doc-node > .title h6 a {
+  text-decoration: none;
+  color: #dae1e7;
+  color: var(--ref-symbol-color);
+}
+.doc-content > .doc-node > .title h1 a:hover,
+.doc-content > .doc-node > .title h2 a:hover,
+.doc-content > .doc-node > .title h3 a:hover,
+.doc-content > .doc-node > .title h4 a:hover,
+.doc-content > .doc-node > .title h5 a:hover,
+.doc-content > .doc-node > .title h6 a:hover {
+  color: #b8c2cc;
+  color: var(--ref-symbol-hover-color);
+}
+.doc-content > .footer {
+  padding-top: 1rem;
+  margin-top: auto;
+  bottom: 1rem;
+  color: 616161;
+  color: var(--footer-text-color);
+  border-color: #f1f5f8;
+  border-color: var(--footer-top-line-color);
+  border-top-style: solid;
+  border-top-width: 1px;
+  font-size: 0.8rem;
+  font-weight: 500;
+}
+
+/* Right menu */
+.doc-toc {
+  right: 0;
+  top: 0;
+  height: 100%;
+  overflow-y: auto;
+  padding: 1rem 1rem 0 1rem;
+  width: 100%;
+  box-sizing: border-box;
+  -ms-overflow-style: none;
+  scrollbar-width: none;
+  font-family: Jost, sans-serif;
+}
+.doc-toc::-webkit-scrollbar {
+  display: none;
+}
+.doc-toc li {
+  line-height: 1.5;
+}
+.doc-toc a {
+  color: #2779bd;
+  color: var(--toc-text-color);
+  font-size: 0.9rem;
+  font-weight: 600;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  display: block;
+  text-decoration: none;
+  border-left-width: 2px;
+  border-left-style: solid;
+  border-color: transparent;
+  padding-left: 0.4rem;
+}
+.doc-toc a:hover {
+  text-decoration: underline;
+}
+.doc-toc a.active {
+  border-color: #4299e1;
+  border-color: var(--toc-indicator-color);
+}
+.doc-toc li ul {
+  margin: 0.2rem 0 0.2rem;
+  font-size: 0.7rem;
+  list-style: none;
+}
+.doc-toc li ul a {
+  font-weight: 400;
+  padding-left: 0.8rem;
+}
+
+/* Code highlight */
+pre,
+code,
+pre code {
+  color: #5c6e74;
+  color: var(--code-default-text-color);
+  font-size: 0.948em;
+  text-shadow: none;
+  font-family: "Jetbrains Mono", monospace;
+  background-color: #edf2f7;
+  background-color: var(--code-background-color);
+  border-radius: 0.25rem;
+}
+pre code {
+  direction: ltr;
+  text-align: left;
+  white-space: pre;
+  word-spacing: normal;
+  word-break: normal;
+  line-height: 1.5;
+  -moz-tab-size: 4;
+  -o-tab-size: 4;
+  tab-size: 4;
+  -webkit-hyphens: none;
+  -moz-hyphens: none;
+  -ms-hyphens: none;
+  hyphens: none;
+  display: block;
+  overflow-x: auto;
+  padding: 1rem;
+}
+code {
+  padding: 0 0.2rem;
+}
+pre {
+  overflow: auto;
+  margin: 0;
+}
+.namespace {
+  opacity: 0.7;
+}
+.token.comment {
+  color: #93a1a1;
+  color: var(--code-comment-text-color);
+}
+.token.punctuation {
+  color: #999999;
+  color: var(--code-punctuation-text-color);
+}
+.token.number,
+.token.symbol {
+  color: #702459;
+  color: var(--code-symbol-text-color);
+}
+.token.string,
+.token.char,
+.token.builtin {
+  color: #38a169;
+  color: var(--code-builtin-text-color);
+}
+.token.operator,
+.token.entity,
+.token.url,
+.language-css .token.string,
+.style .token.string {
+  color: #a67f59;
+  color: var(--code-operator-text-color);
+  background: transparent;
+}
+.token.boolean,
+.token.keyword {
+  color: #2b6cb0;
+  color: var(--code-keyword-text-color);
+}
+.token.function {
+  color: #319795;
+  color: var(--code-function-text-color);
+}
+.examples > h4 {
+  margin: 0 0 0.4rem 0;
+}
+
+/* Medium screen and up */
+@media (min-width: 768px) {
+  *::-webkit-scrollbar {
+    width: 8px;
+    height: 8px;
+  }
+  *::-webkit-scrollbar-thumb {
+    border: 3px solid transparent;
+  }
+  .doc-container {
+    flex-direction: row;
+  }
+  .doc-content {
+    font-size: 0.95rem;
+    flex: 1;
+    padding: 0rem 2rem 1rem 2rem;
+  }
+  .doc-toc {
+    position: relative;
+    /* IE11 */
+    position: sticky;
+    position: -webkit-sticky;
+    align-self: flex-start;
+    top: 56px;
+    height: auto;
+    height: 100vh;
+    min-width: 200px;
+    width: auto;
+    max-width: 300px;
+  }
+  .doc-toc > ul {
+    padding-bottom: 1rem;
+  }
+}
+
+@media (max-width: 1023px) {
+  .doc-nav.hidden {
+    height: auto;
+  }
+  .doc-nav.hidden #search {
+    display: none;
+  }
+  .doc-nav .search.mobile-hidden {
+    display: none;
+  }
+  .doc-nav > .heading-container > .heading > .info {
+    align-items: center;
+  }
+  .doc-nav > .heading-container > .heading > .info > .toggle-version-container {
+    flex-grow: 1;
+    padding: 0 1rem;
+    justify-content: space-between;
+  }
+}
+
+@media (min-width: 1024px) {
+  #page {
+    padding-top: 0;
+  }
+  .doc-nav {
+    width: 300px;
+  }
+  .doc-nav #toggle-menu {
+    display: none;
+  }
+  .doc-nav > .heading-container > .heading > .info {
+    height: auto;
+    padding: 1rem 2rem 0 2rem;
+    flex-direction: column-reverse;
+    justify-content: center;
+  }
+  .doc-nav > .heading-container > .heading > .info > .toggle-version-container {
+    align-items: center;
+    margin-bottom: 0.2rem;
+    display: flex;
+    flex-direction: row-reverse;
+  }
+  .doc-nav
+    > .heading-container
+    > .heading
+    > .info
+    > .toggle-version-container
+    > #dark-mode-toggle {
+    margin-right: auto;
+  }
+  .doc-nav .content.show,
+  .doc-nav .content.hidden {
+    display: flex;
+  }
+  .doc-content > .doc-node.const:nth-child(2) {
+    padding-bottom: 0 !important;
+  }
+  .doc-content > .doc-node.const:not(:first-child) {
+    padding-top: 0;
+  }
+  .doc-content > .doc-node.const:not(:last-child) {
+    padding-bottom: 1rem;
+  }
+  .doc-container {
+    margin-left: 300px;
+  }
+  .doc-node {
+    padding-top: 1rem !important;
+    margin-top: 0 !important;
+  }
+  .doc-toc {
+    top: 0;
+  }
+}
diff --git a/v_windows/v/cmd/tools/vdoc/resources/doc.js b/v_windows/v/cmd/tools/vdoc/resources/doc.js
new file mode 100644
index 0000000..c355d7e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/doc.js
@@ -0,0 +1,235 @@
+(function () {
+    if (document.body.scrollIntoView) {
+        var docnav = document.querySelector('.doc-nav');
+        var active = docnav.querySelector('li.active');
+        if (active) {
+            active.scrollIntoView({ block: 'center', inline: 'nearest' });
+        }
+    }
+    setupScrollSpy();
+    setupMobileToggle();
+    setupDarkMode();
+    setupSearch();
+    setupCollapse();
+})();
+
+function setupScrollSpy() {
+    var sectionPositions = [];
+    var sections = document.querySelectorAll('section');
+    sections.forEach(function (section) {
+        sectionPositions.push(section.offsetTop);
+    });
+    var scrollPos = 0;
+    window.addEventListener('scroll', function (_) {
+        // Reset classes
+        document.querySelectorAll('.doc-toc a[class="active"]').forEach(function (link) {
+            link.classList.remove('active');
+        });
+        // Set current menu link as active
+        var scrollPosition = document.documentElement.scrollTop || document.body.scrollTop;
+        for (var i = 0; i < sectionPositions.length; i++) {
+            var section = sections[i];
+            var position = sectionPositions[i];
+            if (position >= scrollPosition) {
+                var link = document.querySelector('.doc-toc a[href="#' + section.id + '"]');
+                if (link) {
+                    link.classList.add('active');
+                    var docToc = document.querySelector('.doc-toc');
+                    var tocHeight = docToc.clientHeight;
+                    var scrollTop = docToc.scrollTop;
+                    if ((document.body.getBoundingClientRect()).top < scrollPos && scrollTop < link.offsetTop - 10) {
+                        docToc.scrollTop = link.clientHeight + link.offsetTop - tocHeight + 10;
+                    } else if (scrollTop > link.offsetTop - 10) {
+                        docToc.scrollTop = link.offsetTop - 10;
+                    }
+                }
+                break;
+            }
+        }
+        scrollPos = (document.body.getBoundingClientRect()).top;
+    });
+}
+
+function setupMobileToggle() {
+    var toggle = document.getElementById('toggle-menu');
+    toggle.addEventListener('click', function (_) {
+        var docNav = document.querySelector('.doc-nav');
+        var isHidden = docNav.classList.contains('hidden');
+        docNav.classList.toggle('hidden');
+        var search = document.querySelector('.doc-nav > .search');
+        console.log(search);
+        var searchHasResults = search.classList.contains('has-results');
+        if (isHidden && searchHasResults) {
+            search.classList.remove('mobile-hidden');
+        } else {
+            search.classList.add('mobile-hidden');
+        }
+        var content = document.querySelector('.doc-nav .content');
+        content.classList.toggle('hidden');
+        content.classList.toggle('show');
+    });
+}
+
+function setupDarkMode() {
+    var html = document.getElementsByTagName('html')[0];
+    var darkModeToggle = document.getElementById('dark-mode-toggle');
+    darkModeToggle.addEventListener('click', function () {
+        html.classList.toggle('dark');
+        var isDarkModeEnabled = html.classList.contains('dark');
+        localStorage.setItem('dark-mode', isDarkModeEnabled);
+        darkModeToggle.setAttribute('aria-checked', isDarkModeEnabled)
+    });
+    // Check if css var() is supported and enable dark mode toggle
+    if (window.CSS && CSS.supports('color', 'var(--fake-var)')) {
+        darkModeToggle.style.visibility = 'unset';
+    }
+}
+
+function setupSearch() {
+    var searchInput = document.getElementById('search');
+    var onInputChange = debounce(function (e) {
+        var searchValue = e.target.value.toLowerCase();
+        var menu = document.querySelector('.doc-nav > .content');
+        var search = document.querySelector('.doc-nav > .search');
+        if (searchValue === '') {
+            // reset to default
+            menu.style.display = '';
+            if (!search.classList.contains('hidden')) {
+                search.classList.add('hidden');
+                search.classList.remove('has-results');
+            }
+        } else if (searchValue.length >= 2) {
+            // search for less than 2 characters can display too much results
+            search.innerHTML = '';
+            menu.style.display = 'none';
+            if (search.classList.contains('hidden')) {
+                search.classList.remove('hidden');
+                search.classList.remove('mobile-hidden');
+                search.classList.add('has-results');
+            }
+            // cache length for performance
+            var foundModule = false;
+            var searchModuleIndexLength = searchModuleIndex.length;
+            var ul = document.createElement('ul');
+            search.appendChild(ul);
+            for (var i = 0; i < searchModuleIndexLength; i++) {
+                // no toLowerCase needed because modules are always lowercase
+                var title = searchModuleIndex[i];
+                if (title.indexOf(searchValue) === -1) {
+                    continue
+                }
+                foundModule = true;
+                // [description, link]
+                var data = searchModuleData[i];
+                var description = data[0];
+                var link = data[1];
+                var el = createSearchResult({
+                    link: link,
+                    title: title,
+                    description: description,
+                    badge: 'module',
+                });
+                ul.appendChild(el);
+            }
+            if (foundModule) {
+                var hr = document.createElement('hr');
+                hr.classList.add('separator');
+                search.appendChild(hr);
+            }
+            var searchIndexLength = searchIndex.length;
+            var results = [];
+            for (var i = 0; i < searchIndexLength; i++) {
+                var title = searchIndex[i];
+                if (title.toLowerCase().indexOf(searchValue) === -1) {
+                    continue
+                }
+                // [badge, description, link]
+                var data = searchData[i];
+                var badge = data[0];
+                var description = data[1];
+                var link = data[2];
+                var prefix = data[3];
+                results.push({
+                    badge: badge,
+                    description: description,
+                    link: link,
+                    title: prefix + ' ' + title,
+                });
+            }
+            results.sort(function (a, b) {
+                if (a.title < b.title) {
+                    return -1;
+                }
+                if (a.title > b.title) {
+                    return 1;
+                }
+                return 0;
+            });
+            var ul = document.createElement('ul');
+            search.appendChild(ul);
+            for (var i = 0; i < results.length; i++) {
+                var result = results[i];
+                var el = createSearchResult(result);
+                ul.appendChild(el);
+            }
+        }
+    });
+    searchInput.addEventListener('input', onInputChange);
+}
+
+function createSearchResult(data) {
+    var li = document.createElement('li');
+    li.classList.add('result');
+    var a = document.createElement('a');
+    a.href = data.link;
+    a.classList.add('link');
+    li.appendChild(a);
+    var defintion = document.createElement('div');
+    defintion.classList.add('definition');
+    a.appendChild(defintion);
+    if (data.description) {
+        var description = document.createElement('div');
+        description.classList.add('description');
+        description.textContent = data.description;
+        a.appendChild(description);
+    }
+    var title = document.createElement('span');
+    title.classList.add('title');
+    title.textContent = data.title;
+    defintion.appendChild(title);
+    var badge = document.createElement('badge');
+    badge.classList.add('badge');
+    badge.textContent = data.badge;
+    defintion.appendChild(badge);
+    return li;
+}
+
+function setupCollapse() {
+    var dropdownArrows = document.querySelectorAll('.dropdown-arrow');
+    for (var i = 0; i < dropdownArrows.length; i++) {
+        var dropdownArrow = dropdownArrows[i];
+        dropdownArrow.addEventListener('click', function (e) {
+            var parent = e.target.parentElement.parentElement.parentElement;
+            parent.classList.toggle('open');
+        });
+    }
+}
+
+function debounce(func, timeout) {
+    var timer;
+    return (...args) => {
+        const next = () => func(...args);
+        if (timer) {
+            clearTimeout(timer);
+        }
+        timer = setTimeout(next, timeout > 0 ? timeout : 300);
+    }
+}
+
+document.addEventListener('keypress', (ev) => {
+  if (ev.key == '/') {
+    let search = document.getElementById('search');
+    ev.preventDefault();
+    search.focus();
+  }
+});
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/android-chrome-192x192.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/android-chrome-192x192.png
new file mode 100644
index 0000000..a674500
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/android-chrome-192x192.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/android-chrome-512x512.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/android-chrome-512x512.png
new file mode 100644
index 0000000..fe7294e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/android-chrome-512x512.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/apple-touch-icon.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/apple-touch-icon.png
new file mode 100644
index 0000000..d2bedd5
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/apple-touch-icon.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/browserconfig.xml b/v_windows/v/cmd/tools/vdoc/resources/favicons/browserconfig.xml
new file mode 100644
index 0000000..b3930d0
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/browserconfig.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square150x150logo src="/mstile-150x150.png"/>
+            <TileColor>#da532c</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon-16x16.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon-16x16.png
new file mode 100644
index 0000000..ed11964
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon-16x16.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon-32x32.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon-32x32.png
new file mode 100644
index 0000000..083808f
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon-32x32.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon.ico b/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon.ico
new file mode 100644
index 0000000..5123c5e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/favicon.ico
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-144x144.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-144x144.png
new file mode 100644
index 0000000..f34f872
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-144x144.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-150x150.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-150x150.png
new file mode 100644
index 0000000..d511595
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-150x150.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-310x150.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-310x150.png
new file mode 100644
index 0000000..ec8e25f
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-310x150.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-310x310.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-310x310.png
new file mode 100644
index 0000000..8b98e30
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-310x310.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-70x70.png b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-70x70.png
new file mode 100644
index 0000000..4740338
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/mstile-70x70.png
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/safari-pinned-tab.svg b/v_windows/v/cmd/tools/vdoc/resources/favicons/safari-pinned-tab.svg
new file mode 100644
index 0000000..8580c38
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/safari-pinned-tab.svg
@@ -0,0 +1,39 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
+ "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg version="1.0" xmlns="http://www.w3.org/2000/svg"
+ width="700.000000pt" height="700.000000pt" viewBox="0 0 700.000000 700.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.11, written by Peter Selinger 2001-2013
+</metadata>
+<g transform="translate(0.000000,700.000000) scale(0.100000,-0.100000)"
+fill="#000000" stroke="none">
+<path d="M580 6459 c-45 -10 -80 -50 -80 -94 0 -18 20 -89 44 -156 63 -178
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+</g>
+</svg>
diff --git a/v_windows/v/cmd/tools/vdoc/resources/favicons/site.webmanifest b/v_windows/v/cmd/tools/vdoc/resources/favicons/site.webmanifest
new file mode 100644
index 0000000..b20abb7
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/favicons/site.webmanifest
@@ -0,0 +1,19 @@
+{
+    "name": "",
+    "short_name": "",
+    "icons": [
+        {
+            "src": "/android-chrome-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "/android-chrome-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#ffffff",
+    "background_color": "#ffffff",
+    "display": "standalone"
+}
diff --git a/v_windows/v/cmd/tools/vdoc/resources/light.svg b/v_windows/v/cmd/tools/vdoc/resources/light.svg
new file mode 100644
index 0000000..21606c9
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/light.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="light-icon" height="24" viewBox="0 0 24 24" width="24"><path d="M0 0h24v24H0z" fill="none"/><path d="M6.76 4.84l-1.8-1.79-1.41 1.41 1.79 1.79 1.42-1.41zM4 10.5H1v2h3v-2zm9-9.95h-2V3.5h2V.55zm7.45 3.91l-1.41-1.41-1.79 1.79 1.41 1.41 1.79-1.79zm-3.21 13.7l1.79 1.8 1.41-1.41-1.8-1.79-1.4 1.4zM20 10.5v2h3v-2h-3zm-8-5c-3.31 0-6 2.69-6 6s2.69 6 6 6 6-2.69 6-6-2.69-6-6-6zm-1 16.95h2V19.5h-2v2.95zm-7.45-3.91l1.41 1.41 1.79-1.8-1.41-1.41-1.79 1.8z"/></svg>
diff --git a/v_windows/v/cmd/tools/vdoc/resources/link.svg b/v_windows/v/cmd/tools/vdoc/resources/link.svg
new file mode 100644
index 0000000..60d93bb
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/link.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 0 24 24" width="24"><path d="M0 0h24v24H0z" fill="none"/><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"/></svg>
diff --git a/v_windows/v/cmd/tools/vdoc/resources/menu.svg b/v_windows/v/cmd/tools/vdoc/resources/menu.svg
new file mode 100644
index 0000000..c069b00
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/menu.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="toggle-menu" height="24" viewBox="0 0 24 24" width="24"><path d="M0 0h24v24H0z" fill="none"/><path d="M3 18h18v-2H3v2zm0-5h18v-2H3v2zm0-7v2h18V6H3z"/></svg>
diff --git a/v_windows/v/cmd/tools/vdoc/resources/normalize.css b/v_windows/v/cmd/tools/vdoc/resources/normalize.css
new file mode 100644
index 0000000..d9fbe67
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/resources/normalize.css
@@ -0,0 +1,171 @@
+/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
+html {
+	line-height: 1.15;
+	-webkit-text-size-adjust: 100%;
+}
+
+main {
+	display: block;
+}
+
+h1 {
+	font-size: 2em;
+	margin: 0.67em 0;
+}
+
+hr {
+	box-sizing: content-box;
+	height: 0;
+	overflow: visible;
+}
+
+pre {
+	font-family: monospace, monospace;
+	font-size: 1em;
+}
+
+a {
+	background-color: transparent;
+}
+
+abbr[title] {
+	border-bottom: none;
+	text-decoration: underline;
+	text-decoration: underline dotted;
+}
+
+b,
+strong {
+	font-weight: bolder;
+}
+
+kbd,
+samp {
+	font-family: monospace, monospace;
+	font-size: 1em;
+}
+
+small {
+	font-size: 80%;
+}
+
+sub,
+sup {
+	font-size: 75%;
+	line-height: 0;
+	position: relative;
+	vertical-align: baseline;
+}
+
+sub {
+	bottom: -0.25em;
+}
+
+sup {
+	top: -0.5em;
+}
+
+img {
+	border-style: none;
+}
+
+button,
+input,
+optgroup,
+select,
+textarea {
+	font-family: inherit;
+	font-size: 100%;
+	line-height: 1.15;
+	margin: 0;
+}
+
+button,
+input {
+	overflow: visible;
+}
+
+button,
+select {
+	text-transform: none;
+}
+
+button,
+[type="button"],
+[type="reset"],
+[type="submit"] {
+	-webkit-appearance: button;
+}
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+	border-style: none;
+	padding: 0;
+}
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+	outline: 1px dotted ButtonText;
+}
+
+fieldset {
+	padding: 0.35em 0.75em 0.625em;
+}
+
+legend {
+	box-sizing: border-box;
+	color: inherit;
+	display: table;
+	max-width: 100%;
+	padding: 0;
+	white-space: normal;
+}
+
+progress {
+	vertical-align: baseline;
+}
+
+textarea {
+	overflow: auto;
+}
+
+[type="checkbox"],
+[type="radio"] {
+	box-sizing: border-box;
+	padding: 0;
+}
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+	height: auto;
+}
+
+[type="search"] {
+	-webkit-appearance: textfield;
+	outline-offset: -2px;
+}
+
+[type="search"]::-webkit-search-decoration {
+	-webkit-appearance: none;
+}
+
+::-webkit-file-upload-button {
+	-webkit-appearance: button;
+	font: inherit;
+}
+
+summary {
+	display: list-item;
+}
+
+template {
+	display: none;
+}
+
+[hidden] {
+	display: none;
+}
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.comments.out b/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.comments.out
new file mode 100644
index 0000000..326f0c5
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.comments.out
@@ -0,0 +1,7 @@
+module main
+
+const (
+	source_root = 'temp'
+)
+fn funky()
+    funky - comment for function below
\ No newline at end of file
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.out b/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.out
new file mode 100644
index 0000000..08fe504
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.out
@@ -0,0 +1,6 @@
+module main
+
+const (
+	source_root = 'temp'
+)
+fn funky()
\ No newline at end of file
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.v b/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.v
new file mode 100644
index 0000000..9cb66e3
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/basic/main.v
@@ -0,0 +1,8 @@
+pub const (
+	source_root = 'temp'
+)
+
+// funky - comment for function below
+pub fn funky() {
+	println('hi')
+}
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.comments.out b/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.comments.out
new file mode 100644
index 0000000..793abf1
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.comments.out
@@ -0,0 +1,9 @@
+module main
+
+fn a1()
+    normal comment
+fn a2()
+    this should be merged into the same line
+fn a3()
+    This should be its own parapgraph, because it ends with a dot.  
+    This should be another paragraph.
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.out b/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.out
new file mode 100644
index 0000000..4a3c36b
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.out
@@ -0,0 +1,5 @@
+module main
+
+fn a1()
+fn a2()
+fn a3()
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.v b/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.v
new file mode 100644
index 0000000..840ca43
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/multiline/main.v
@@ -0,0 +1,16 @@
+// normal comment
+pub fn a1() {
+	println('hi')
+}
+
+// this should be merged
+// into the same line
+pub fn a2() {
+	println('hi')
+}
+
+// This should be its own parapgraph, because it ends with a dot.
+// This should be another paragraph.
+pub fn a3() {
+	println('hi')
+}
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.comments.out b/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.comments.out
new file mode 100644
index 0000000..f3ee942
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.comments.out
@@ -0,0 +1,22 @@
+module main
+
+fn funky()
+    hello
+    
+    empty line
+    newline using a full stop.  
+    ```v
+    code
+    ```
+    
+    test
+    ====
+    - foo
+    - bar
+    # test
+    ########### deep test
+    #a shouldnt have a newline test
+    
+    | foo bar   |  yes   |
+    |-----------|--------|
+    |  working  |  yup   |
\ No newline at end of file
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.out b/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.out
new file mode 100644
index 0000000..02bcce9
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.out
@@ -0,0 +1,3 @@
+module main
+
+fn funky()
\ No newline at end of file
diff --git a/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.v b/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.v
new file mode 100644
index 0000000..8d2bf90
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/testdata/newlines/main.v
@@ -0,0 +1,23 @@
+// hello
+//
+// empty line
+// newline using a full stop.
+// ```v
+// code
+// ```
+//
+// test
+// ====
+// - foo
+// - bar
+// # test
+// ########### deep test
+// #a shouldnt have a newline
+// test
+//
+// | foo bar   |  yes   |
+// |-----------|--------|
+// |  working  |  yup   |
+pub fn funky() {
+	println('hi')
+}
diff --git a/v_windows/v/cmd/tools/vdoc/tests/vdoc_file_test.v b/v_windows/v/cmd/tools/vdoc/tests/vdoc_file_test.v
new file mode 100644
index 0000000..254337c
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/tests/vdoc_file_test.v
@@ -0,0 +1,92 @@
+import os
+import rand
+import term
+import v.util.vtest
+import v.util.diff
+
+const vexe = @VEXE
+
+const vroot = @VMODROOT
+
+const diff_cmd = find_diff_cmd()
+
+fn find_diff_cmd() string {
+	return diff.find_working_diff_command() or { '' }
+}
+
+fn test_vet() ? {
+	os.setenv('VCOLORS', 'never', true)
+	os.chdir(vroot) ?
+	test_dir := 'cmd/tools/vdoc/tests/testdata'
+	main_files := get_main_files_in_dir(test_dir)
+	fails := check_path(vexe, test_dir, main_files)
+	assert fails == 0
+}
+
+fn get_main_files_in_dir(dir string) []string {
+	mut mfiles := os.walk_ext(dir, '.v')
+	mfiles.sort()
+	return mfiles
+}
+
+fn check_path(vexe string, dir string, tests []string) int {
+	mut nb_fail := 0
+	paths := vtest.filter_vtest_only(tests, basepath: vroot)
+	for path in paths {
+		program := path
+		print(path + ' ')
+		res := os.execute('$vexe doc $program')
+		if res.exit_code < 0 {
+			panic(res.output)
+		}
+		mut expected := os.read_file(program.replace('main.v', 'main.out')) or { panic(err) }
+		expected = clean_line_endings(expected)
+		found := clean_line_endings(res.output)
+		if expected != found {
+			print_compare(expected, found)
+		}
+
+		res_comments := os.execute('$vexe doc -comments $program')
+		if res_comments.exit_code < 0 {
+			panic(res_comments.output)
+		}
+		mut expected_comments := os.read_file(program.replace('main.v', 'main.comments.out')) or {
+			panic(err)
+		}
+		expected_comments = clean_line_endings(expected_comments)
+		found_comments := clean_line_endings(res_comments.output)
+		if expected_comments != found_comments {
+			print_compare(expected_comments, found_comments)
+		}
+
+		if expected == found && expected_comments == found_comments {
+			println(term.green('OK'))
+		} else {
+			nb_fail++
+		}
+	}
+	return nb_fail
+}
+
+fn print_compare(expected string, found string) {
+	println(term.red('FAIL'))
+	println('============')
+	println('expected:')
+	println(expected)
+	println('============')
+	println('found:')
+	println(found)
+	println('============\n')
+	println('diff:')
+	println(diff.color_compare_strings(diff_cmd, rand.ulid(), found, expected))
+	println('============\n')
+}
+
+fn clean_line_endings(s string) string {
+	mut res := s.trim_space()
+	res = res.replace(' \n', '\n')
+	res = res.replace(' \r\n', '\n')
+	res = res.replace('\r\n', '\n')
+	res = res.trim('\n')
+	return res
+}
diff --git a/v_windows/v/cmd/tools/vdoc/utils.v b/v_windows/v/cmd/tools/vdoc/utils.v
new file mode 100644
index 0000000..4b07373
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/utils.v
@@ -0,0 +1,275 @@
+module main
+
+import os
+import v.doc
+import term
+import v.ast
+import v.scanner
+import v.token
+import strings
+import v.pref
+
+[inline]
+fn slug(title string) string {
+	return title.replace(' ', '-')
+}
+
+fn escape(str string) string {
+	return str.replace_each(['"', '\\"', '\r\n', '\\n', '\n', '\\n', '\t', '\\t'])
+}
+
+fn get_sym_name(dn doc.DocNode) string {
+	sym_name := if dn.parent_name.len > 0 && dn.parent_name != 'void' {
+		'($dn.parent_name) $dn.name'
+	} else {
+		dn.name
+	}
+	return sym_name
+}
+
+fn get_node_id(dn doc.DocNode) string {
+	tag := if dn.parent_name.len > 0 && dn.parent_name != 'void' {
+		'${dn.parent_name}.$dn.name'
+	} else {
+		dn.name
+	}
+	return slug(tag)
+}
+
+fn is_module_readme(dn doc.DocNode) bool {
+	if dn.comments.len > 0 && dn.content == 'module $dn.name' {
+		return true
+	}
+	return false
+}
+
+fn trim_doc_node_description(description string) string {
+	mut dn_description := description.replace_each(['\r\n', '\n', '"', '\\"'])
+	// 80 is enough to fill one line
+	if dn_description.len > 80 {
+		dn_description = dn_description[..80]
+	}
+	if dn_description.contains('\n') {
+		dn_description = dn_description.split('\n')[0]
+	}
+	// if \ is last character, it ends with \" which leads to a JS error
+	if dn_description.ends_with('\\') {
+		dn_description = dn_description.trim_right('\\')
+	}
+	return dn_description
+}
+
+fn set_output_type_from_str(format string) OutputType {
+	output_type := match format {
+		'htm', 'html' { OutputType.html }
+		'md', 'markdown' { OutputType.markdown }
+		'json' { OutputType.json }
+		'stdout' { OutputType.stdout }
+		else { OutputType.plaintext }
+	}
+	return output_type
+}
+
+fn get_ignore_paths(path string) ?[]string {
+	ignore_file_path := os.join_path(path, '.vdocignore')
+	ignore_content := os.read_file(ignore_file_path) or {
+		return error_with_code('ignore file not found.', 1)
+	}
+	mut res := []string{}
+	if ignore_content.trim_space().len > 0 {
+		rules := ignore_content.split_into_lines().map(it.trim_space())
+		mut final := []string{}
+		for rule in rules {
+			if rule.contains('*.') || rule.contains('**') {
+				println('vdoc: Wildcards in ignore rules are not allowed for now.')
+				continue
+			}
+			final << rule
+		}
+		res = final.map(os.join_path(path, it.trim_right('/')))
+	} else {
+		mut dirs := os.ls(path) or { return []string{} }
+		res = dirs.map(os.join_path(path, it)).filter(os.is_dir(it))
+	}
+	return res.map(it.replace('/', os.path_separator))
+}
+
+fn is_included(path string, ignore_paths []string) bool {
+	if path.len == 0 {
+		return true
+	}
+	for ignore_path in ignore_paths {
+		if !path.contains(ignore_path) {
+			continue
+		}
+		return false
+	}
+	return true
+}
+
+fn get_modules_list(path string, ignore_paths2 []string) []string {
+	files := os.ls(path) or { return []string{} }
+	mut ignore_paths := get_ignore_paths(path) or { []string{} }
+	ignore_paths << ignore_paths2
+	mut dirs := []string{}
+	for file in files {
+		fpath := os.join_path(path, file)
+		if os.is_dir(fpath) && is_included(fpath, ignore_paths) && !os.is_link(path) {
+			dirs << get_modules_list(fpath, ignore_paths.filter(it.starts_with(fpath)))
+		} else if fpath.ends_with('.v') && !fpath.ends_with('_test.v') {
+			if path in dirs {
+				continue
+			}
+			dirs << path
+		}
+	}
+	dirs.sort()
+	return dirs
+}
+
+fn gen_footer_text(d &doc.Doc, include_timestamp bool) string {
+	footer_text := 'Powered by vdoc.'
+	if !include_timestamp {
+		return footer_text
+	}
+	generated_time := d.time_generated
+	time_str := '$generated_time.day $generated_time.smonth() $generated_time.year $generated_time.hhmmss()'
+	return '$footer_text Generated on: $time_str'
+}
+
+fn color_highlight(code string, tb &ast.Table) string {
+	builtin := ['bool', 'string', 'i8', 'i16', 'int', 'i64', 'i128', 'byte', 'u16', 'u32', 'u64',
+		'u128', 'rune', 'f32', 'f64', 'int_literal', 'float_literal', 'byteptr', 'voidptr', 'any']
+	highlight_code := fn (tok token.Token, typ HighlightTokenTyp) string {
+		mut lit := ''
+		match typ {
+			.unone, .operator, .punctuation {
+				lit = tok.kind.str()
+			}
+			.string {
+				use_double_quote := tok.lit.contains("'") && !tok.lit.contains('"')
+				unescaped_val := tok.lit.replace('\\\\', '\x01').replace_each(["\\'", "'", '\\"',
+					'"',
+				])
+				if use_double_quote {
+					s := unescaped_val.replace_each(['\x01', '\\\\', '"', '\\"'])
+					lit = term.yellow('"$s"')
+				} else {
+					s := unescaped_val.replace_each(['\x01', '\\\\', "'", "\\'"])
+					lit = term.yellow("'$s'")
+				}
+			}
+			.char {
+				lit = term.yellow('`$tok.lit`')
+			}
+			.keyword {
+				lit = term.bright_blue(tok.lit)
+			}
+			.builtin, .symbol {
+				lit = term.green(tok.lit)
+			}
+			.function {
+				lit = term.cyan(tok.lit)
+			}
+			.number, .module_ {
+				lit = term.bright_blue(tok.lit)
+			}
+			.boolean {
+				lit = term.bright_magenta(tok.lit)
+			}
+			.none_ {
+				lit = term.red(tok.lit)
+			}
+			.prefix {
+				lit = term.magenta(tok.lit)
+			}
+			else {
+				lit = tok.lit
+			}
+		}
+		return lit
+	}
+	mut s := scanner.new_scanner(code, .parse_comments, &pref.Preferences{ is_fmt: true })
+	mut prev_prev := token.Token{}
+	mut prev := token.Token{}
+	mut tok := s.scan()
+	mut next_tok := s.scan()
+	mut buf := strings.new_builder(200)
+	mut i := 0
+	for i < code.len {
+		if i == tok.pos {
+			mut tok_typ := HighlightTokenTyp.unone
+			match tok.kind {
+				.name {
+					if (tok.lit in builtin || tb.known_type(tok.lit))
+						&& (next_tok.kind != .lpar || prev.kind !in [.key_fn, .rpar]) {
+						tok_typ = .builtin
+					} else if
+						next_tok.kind in [.lcbr, .rpar, .eof, .comma, .pipe, .name, .rcbr, .assign, .key_pub, .key_mut, .pipe, .comma]
+						&& prev.kind in [.name, .amp, .rsbr, .key_type, .assign, .dot, .question, .rpar, .key_struct, .key_enum, .pipe, .key_interface]
+						&& (tok.lit[0].ascii_str().is_upper() || prev_prev.lit in ['C', 'JS']) {
+						tok_typ = .symbol
+					} else if next_tok.kind in [.lpar, .lt] {
+						tok_typ = .function
+					} else if next_tok.kind == .dot {
+						if tok.lit in ['C', 'JS'] {
+							tok_typ = .prefix
+						} else {
+							if tok.lit[0].ascii_str().is_upper() {
+								tok_typ = .symbol
+							} else {
+								tok_typ = .module_
+							}
+						}
+					} else if tok.lit in ['r', 'c'] && next_tok.kind == .string {
+						tok_typ = .prefix
+					} else {
+						tok_typ = .name
+					}
+				}
+				.comment {
+					tok_typ = .comment
+				}
+				.chartoken {
+					tok_typ = .char
+				}
+				.string {
+					tok_typ = .string
+				}
+				.number {
+					tok_typ = .number
+				}
+				.key_true, .key_false {
+					tok_typ = .boolean
+				}
+				.lpar, .lcbr, .rpar, .rcbr, .lsbr, .rsbr, .semicolon, .colon, .comma, .dot {
+					tok_typ = .punctuation
+				}
+				.key_none {
+					tok_typ = .none_
+				}
+				else {
+					if token.is_key(tok.lit) || token.is_decl(tok.kind) {
+						tok_typ = .keyword
+					} else if tok.kind == .decl_assign || tok.kind.is_assign() || tok.is_unary()
+						|| tok.kind.is_relational() || tok.kind.is_infix() {
+						tok_typ = .operator
+					}
+				}
+			}
+			buf.write_string(highlight_code(tok, tok_typ))
+			if prev_prev.kind == .eof || prev.kind == .eof || next_tok.kind == .eof {
+				break
+			}
+			prev_prev = prev
+			prev = tok
+			i = tok.pos + tok.len
+			tok = next_tok
+			next_tok = s.scan()
+		} else {
+			buf.write_b(code[i])
+			i++
+		}
+	}
+	return buf.str()
+}
diff --git a/v_windows/v/cmd/tools/vdoc/vdoc.v b/v_windows/v/cmd/tools/vdoc/vdoc.v
new file mode 100644
index 0000000..dc74001
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoc/vdoc.v
@@ -0,0 +1,517 @@
+module main
+
+import markdown
+import os
+import os.cmdline
+import time
+import strings
+import sync
+import runtime
+import v.doc
+import v.pref
+import v.vmod
+import json
+import term
+
+const (
+	allowed_formats = ['md', 'markdown', 'json', 'text', 'stdout', 'html', 'htm']
+	vexe            = pref.vexe_path()
+	vroot           = os.dir(vexe)
+	tabs            = ['\t\t', '\t\t\t\t\t\t', '\t\t\t\t\t\t\t']
+)
+
+enum OutputType {
+	unset
+	html
+	markdown
+	json
+	plaintext
+	stdout
+}
+
+struct VDoc {
+	cfg Config [required]
+mut:
+	docs                []doc.Doc
+	assets              map[string]string
+	manifest            vmod.Manifest
+	search_index        []string
+	search_data         []SearchResult
+	search_module_index []string // search results are split into a module part and the rest
+	search_module_data  []SearchModuleResult
+}
+
+struct Config {
+mut:
+	pub_only         bool = true
+	show_loc         bool // for plaintext
+	is_color         bool
+	is_multi         bool
+	is_vlib          bool
+	is_verbose       bool
+	include_readme   bool
+	include_examples bool = true
+	include_comments bool // for plaintext
+	inline_assets    bool
+	no_timestamp     bool
+	output_path      string
+	output_type      OutputType = .unset
+	input_path       string
+	symbol_name      string
+	platform         doc.Platform
+}
+
+//
+struct Output {
+mut:
+	path string
+	typ  OutputType = .unset
+}
+
+struct ParallelDoc {
+	d   doc.Doc
+	out Output
+}
+
+fn (vd VDoc) gen_json(d doc.Doc) string {
+	cfg := vd.cfg
+	mut jw := strings.new_builder(200)
+	comments := if cfg.include_examples {
+		d.head.merge_comments()
+	} else {
+		d.head.merge_comments_without_examples()
+	}
+	jw.write_string('{"module_name":"$d.head.name","description":"${escape(comments)}","contents":')
+	jw.write_string(json.encode(d.contents.keys().map(d.contents[it])))
+	jw.write_string(',"generator":"vdoc","time_generated":"$d.time_generated.str()"}')
+	return jw.str()
+}
+
+fn (vd VDoc) gen_plaintext(d doc.Doc) string {
+	cfg := vd.cfg
+	mut pw := strings.new_builder(200)
+	if cfg.is_color {
+		content_arr := d.head.content.split(' ')
+		pw.writeln('${term.bright_blue(content_arr[0])} ${term.green(content_arr[1])}\n')
+	} else {
+		pw.writeln('$d.head.content\n')
+	}
+	if cfg.include_comments {
+		comments := if cfg.include_examples {
+			d.head.merge_comments()
+		} else {
+			d.head.merge_comments_without_examples()
+		}
+		if comments.trim_space().len > 0 {
+			pw.writeln(comments.split_into_lines().map('    ' + it).join('\n'))
+		}
+	}
+	vd.write_plaintext_content(d.contents.arr(), mut pw)
+	return pw.str()
+}
+
+fn (vd VDoc) write_plaintext_content(contents []doc.DocNode, mut pw strings.Builder) {
+	cfg := vd.cfg
+	for cn in contents {
+		if cn.content.len > 0 {
+			if cfg.is_color {
+				pw.writeln(color_highlight(cn.content, vd.docs[0].table))
+			} else {
+				pw.writeln(cn.content)
+			}
+			if cn.comments.len > 0 && cfg.include_comments {
+				comments := if cfg.include_examples {
+					cn.merge_comments()
+				} else {
+					cn.merge_comments_without_examples()
+				}
+				pw.writeln(comments.trim_space().split_into_lines().map('    ' + it).join('\n'))
+			}
+			if cfg.show_loc {
+				pw.writeln('Location: $cn.file_path:${cn.pos.line_nr + 1}\n')
+			}
+		}
+		vd.write_plaintext_content(cn.children, mut pw)
+	}
+}
+
+fn (vd VDoc) render_doc(d doc.Doc, out Output) (string, string) {
+	name := vd.get_file_name(d.head.name, out)
+	output := match out.typ {
+		.html { vd.gen_html(d) }
+		.markdown { vd.gen_markdown(d, true) }
+		.json { vd.gen_json(d) }
+		else { vd.gen_plaintext(d) }
+	}
+	return name, output
+}
+
+// get_file_name returns the final file name from a module name
+fn (vd VDoc) get_file_name(mod string, out Output) string {
+	cfg := vd.cfg
+	mut name := mod
+	// since builtin is generated first, ignore it
+	if (cfg.is_vlib && mod == 'builtin' && !cfg.include_readme) || mod == 'README' {
+		name = 'index'
+	} else if !cfg.is_multi && !os.is_dir(out.path) {
+		name = os.file_name(out.path)
+	}
+	name = name + match out.typ {
+		.html { '.html' }
+		.markdown { '.md' }
+		.json { '.json' }
+		else { '.txt' }
+	}
+	return name
+}
+
+fn (vd VDoc) work_processor(mut work sync.Channel, mut wg sync.WaitGroup) {
+	for {
+		mut pdoc := ParallelDoc{}
+		if !work.pop(&pdoc) {
+			break
+		}
+		file_name, content := vd.render_doc(pdoc.d, pdoc.out)
+		output_path := os.join_path(pdoc.out.path, file_name)
+		println('Generating $pdoc.out.typ in "$output_path"')
+		os.write_file(output_path, content) or { panic(err) }
+	}
+	wg.done()
+}
+
+fn (vd VDoc) render_parallel(out Output) {
+	vjobs := runtime.nr_jobs()
+	mut work := sync.new_channel<ParallelDoc>(u32(vd.docs.len))
+	mut wg := sync.new_waitgroup()
+	for i in 0 .. vd.docs.len {
+		p_doc := ParallelDoc{vd.docs[i], out}
+		work.push(&p_doc)
+	}
+	work.close()
+	wg.add(vjobs)
+	for _ in 0 .. vjobs {
+		go vd.work_processor(mut work, mut wg)
+	}
+	wg.wait()
+}
+
+fn (vd VDoc) render(out Output) map[string]string {
+	mut docs := map[string]string{}
+	for doc in vd.docs {
+		name, output := vd.render_doc(doc, out)
+		docs[name] = output.trim_space()
+	}
+	vd.vprintln('Rendered: ' + docs.keys().str())
+	return docs
+}
+
+fn (vd VDoc) get_readme(path string) string {
+	mut fname := ''
+	for name in ['readme', 'README'] {
+		if os.exists(os.join_path(path, '${name}.md')) {
+			fname = name
+			break
+		}
+	}
+	if fname == '' {
+		return ''
+	}
+	readme_path := os.join_path(path, '${fname}.md')
+	vd.vprintln('Reading README file from $readme_path')
+	readme_contents := os.read_file(readme_path) or { '' }
+	return readme_contents
+}
+
+fn (vd VDoc) emit_generate_err(err IError) {
+	cfg := vd.cfg
+	mut err_msg := err.msg
+	if err.code == 1 {
+		mod_list := get_modules_list(cfg.input_path, []string{})
+		println('Available modules:\n==================')
+		for mod in mod_list {
+			println(mod.all_after('vlib/').all_after('modules/').replace('/', '.'))
+		}
+		err_msg += ' Use the `-m` flag when generating docs from a directory that has multiple modules.'
+	}
+	eprintln(err_msg)
+}
+
+fn (mut vd VDoc) generate_docs_from_file() {
+	cfg := vd.cfg
+	mut out := Output{
+		path: cfg.output_path
+		typ: cfg.output_type
+	}
+	if out.path.len == 0 {
+		if cfg.output_type == .unset {
+			out.typ = .stdout
+		} else {
+			vd.vprintln('No output path has detected. Using input path instead.')
+			out.path = cfg.input_path
+		}
+	} else if out.typ == .unset {
+		vd.vprintln('Output path detected. Identifying output type..')
+		ext := os.file_ext(out.path)
+		out.typ = set_output_type_from_str(ext.all_after('.'))
+	}
+	if cfg.include_readme && out.typ !in [.html, .stdout] {
+		eprintln('vdoc: Including README.md for doc generation is supported on HTML output, or when running directly in the terminal.')
+		exit(1)
+	}
+	dir_path := if cfg.is_vlib {
+		vroot
+	} else if os.is_dir(cfg.input_path) {
+		cfg.input_path
+	} else {
+		os.dir(cfg.input_path)
+	}
+	manifest_path := os.join_path(dir_path, 'v.mod')
+	if os.exists(manifest_path) {
+		vd.vprintln('Reading v.mod info from $manifest_path')
+		if manifest := vmod.from_file(manifest_path) {
+			vd.manifest = manifest
+		}
+	}
+	if cfg.include_readme {
+		readme_contents := vd.get_readme(dir_path)
+		comment := doc.DocComment{
+			text: readme_contents
+		}
+		if out.typ == .stdout {
+			println(markdown.to_plain(readme_contents))
+		} else if out.typ == .html && cfg.is_multi {
+			vd.docs << doc.Doc{
+				head: doc.DocNode{
+					name: 'README'
+					comments: [comment]
+				}
+				time_generated: time.now()
+			}
+		}
+	}
+	dirs := if cfg.is_multi {
+		get_modules_list(cfg.input_path, []string{})
+	} else {
+		[cfg.input_path]
+	}
+	for dirpath in dirs {
+		vd.vprintln('Generating $out.typ docs for "$dirpath"')
+		mut dcs := doc.generate(dirpath, cfg.pub_only, true, cfg.platform, cfg.symbol_name) or {
+			vd.emit_generate_err(err)
+			exit(1)
+		}
+		if dcs.contents.len == 0 {
+			continue
+		}
+		if cfg.is_multi || (!cfg.is_multi && cfg.include_readme) {
+			readme_contents := vd.get_readme(dirpath)
+			comment := doc.DocComment{
+				text: readme_contents
+			}
+			dcs.head.comments = [comment]
+		}
+		if cfg.pub_only {
+			for name, dc in dcs.contents {
+				dcs.contents[name].content = dc.content.all_after('pub ')
+				for i, cc in dc.children {
+					dcs.contents[name].children[i].content = cc.content.all_after('pub ')
+				}
+			}
+		}
+		vd.docs << dcs
+	}
+	// Important. Let builtin be in the top of the module list
+	// if we are generating docs for vlib.
+	if cfg.is_vlib {
+		mut docs := vd.docs.filter(it.head.name == 'builtin')
+		docs << vd.docs.filter(it.head.name != 'builtin')
+		vd.docs = docs
+	}
+	vd.vprintln('Rendering docs...')
+	if out.path.len == 0 || out.path == 'stdout' {
+		if out.typ == .html {
+			vd.render_static_html(out)
+		}
+		outputs := vd.render(out)
+		if outputs.len == 0 {
+			eprintln('vdoc: No documentation found for ${dirs[0]}')
+			exit(1)
+		} else {
+			first := outputs.keys()[0]
+			println(outputs[first])
+		}
+	} else {
+		if !os.exists(out.path) {
+			os.mkdir_all(out.path) or { panic(err) }
+		} else if !os.is_dir(out.path) {
+			out.path = os.real_path('.')
+		}
+		if cfg.is_multi {
+			out.path = os.join_path(out.path, '_docs')
+			if !os.exists(out.path) {
+				os.mkdir(out.path) or { panic(err) }
+			} else {
+				for fname in css_js_assets {
+					existing_asset_path := os.join_path(out.path, fname)
+					if os.exists(existing_asset_path) {
+						os.rm(existing_asset_path) or { panic(err) }
+					}
+				}
+			}
+		}
+		if out.typ == .html {
+			vd.render_static_html(out)
+		}
+		vd.render_parallel(out)
+		if out.typ == .html {
+			println('Creating search index...')
+			vd.collect_search_index(out)
+			vd.render_search_index(out)
+			// move favicons to target directory
+			println('Copying favicons...')
+			favicons := os.ls(favicons_path) or { panic(err) }
+			for favicon in favicons {
+				favicon_path := os.join_path(favicons_path, favicon)
+				destination_path := os.join_path(out.path, favicon)
+				os.cp(favicon_path, destination_path) or { panic(err) }
+			}
+		}
+	}
+}
+
+fn (vd VDoc) vprintln(str string) {
+	if vd.cfg.is_verbose {
+		println('vdoc: $str')
+	}
+}
+
+fn parse_arguments(args []string) Config {
+	mut cfg := Config{}
+	cfg.is_color = term.can_show_color_on_stdout()
+	for i := 0; i < args.len; i++ {
+		arg := args[i]
+		current_args := args[i..]
+		match arg {
+			'-all' {
+				cfg.pub_only = false
+			}
+			'-f' {
+				format := cmdline.option(current_args, '-f', '')
+				if format !in allowed_formats {
+					allowed_str := allowed_formats.join(', ')
+					eprintln('vdoc: "$format" is not a valid format. Only $allowed_str are allowed.')
+					exit(1)
+				}
+				cfg.output_type = set_output_type_from_str(format)
+				i++
+			}
+			'-color' {
+				cfg.is_color = true
+			}
+			'-no-color' {
+				cfg.is_color = false
+			}
+			'-inline-assets' {
+				cfg.inline_assets = true
+			}
+			'-l' {
+				cfg.show_loc = true
+			}
+			'-comments' {
+				cfg.include_comments = true
+			}
+			'-m' {
+				cfg.is_multi = true
+			}
+			'-o' {
+				opath := cmdline.option(current_args, '-o', '')
+				cfg.output_path = if opath == 'stdout' { opath } else { os.real_path(opath) }
+				i++
+			}
+			'-os' {
+				platform_str := cmdline.option(current_args, '-os', '')
+				if platform_str == 'cross' {
+					eprintln('`v doc -os cross` is not supported yet.')
+					exit(1)
+				}
+				selected_platform := doc.platform_from_string(platform_str) or {
+					eprintln(err.msg)
+					exit(1)
+				}
+				cfg.platform = selected_platform
+				i++
+			}
+			'-no-timestamp' {
+				cfg.no_timestamp = true
+			}
+			'-no-examples' {
+				cfg.include_examples = false
+			}
+			'-readme' {
+				cfg.include_readme = true
+			}
+			'-v' {
+				cfg.is_verbose = true
+			}
+			else {
+				if cfg.input_path.len < 1 {
+					cfg.input_path = arg
+				} else if !cfg.is_multi {
+					// Symbol name filtering should not be enabled
+					// in multi-module documentation mode.
+					cfg.symbol_name = arg
+				}
+				if i == args.len - 1 {
+					break
+				}
+			}
+		}
+	}
+	// Correct from configuration from user input
+	if cfg.output_path == 'stdout' && cfg.output_type == .html {
+		cfg.inline_assets = true
+	}
+	$if windows {
+		cfg.input_path = cfg.input_path.replace('/', os.path_separator)
+	} $else {
+		cfg.input_path = cfg.input_path.replace('\\', os.path_separator)
+	}
+	is_path := cfg.input_path.ends_with('.v') || cfg.input_path.split(os.path_separator).len > 1
+		|| cfg.input_path == '.'
+	if cfg.input_path.trim_right('/') == 'vlib' {
+		cfg.is_vlib = true
+		cfg.is_multi = true
+		cfg.input_path = os.join_path(vroot, 'vlib')
+	} else if !is_path {
+		// TODO vd.vprintln('Input "$cfg.input_path" is not a valid path. Looking for modules named "$cfg.input_path"...')
+		mod_path := doc.lookup_module(cfg.input_path) or {
+			eprintln('vdoc: $err')
+			exit(1)
+		}
+		cfg.input_path = mod_path
+	}
+	return cfg
+}
+
+fn main() {
+	if os.args.len < 2 || '-h' in os.args || '-help' in os.args || '--help' in os.args
+		|| os.args[1..] == ['doc', 'help'] {
+		os.system('$vexe help doc')
+		exit(0)
+	}
+	args := os.args[2..].clone()
+	cfg := parse_arguments(args)
+	if cfg.input_path.len == 0 {
+		eprintln('vdoc: No input path found.')
+		exit(1)
+	}
+	// Config is immutable from this point on
+	mut vd := VDoc{
+		cfg: cfg
+		manifest: vmod.Manifest{
+			repo_url: ''
+		}
+	}
+	vd.vprintln('Setting output type to "$cfg.output_type"')
+	vd.generate_docs_from_file()
+}
diff --git a/v_windows/v/cmd/tools/vdoctor.exe b/v_windows/v/cmd/tools/vdoctor.exe
new file mode 100644
index 0000000..7ee4e09
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoctor.exe
diff --git a/v_windows/v/cmd/tools/vdoctor.v b/v_windows/v/cmd/tools/vdoctor.v
new file mode 100644
index 0000000..05ebfb3
--- /dev/null
+++ b/v_windows/v/cmd/tools/vdoctor.v
@@ -0,0 +1,264 @@
+import os
+import time
+import term
+import v.util.version
+import runtime
+
+struct App {
+mut:
+	report_lines   []string
+	cached_cpuinfo map[string]string
+}
+
+fn (mut a App) println(s string) {
+	a.report_lines << s
+}
+
+fn (mut a App) collect_info() {
+	mut os_kind := os.user_os()
+	mut arch_details := []string{}
+	arch_details << '$runtime.nr_cpus() cpus'
+	if runtime.is_32bit() {
+		arch_details << '32bit'
+	}
+	if runtime.is_64bit() {
+		arch_details << '64bit'
+	}
+	if runtime.is_big_endian() {
+		arch_details << 'big endian'
+	}
+	if runtime.is_little_endian() {
+		arch_details << 'little endian'
+	}
+	if os_kind == 'macos' {
+		arch_details << a.cmd(command: 'sysctl -n machdep.cpu.brand_string')
+	}
+	if os_kind == 'linux' {
+		mut cpu_details := ''
+		if cpu_details == '' {
+			cpu_details = a.cpu_info('model name')
+		}
+		if cpu_details == '' {
+			cpu_details = a.cpu_info('hardware')
+		}
+		if cpu_details == '' {
+			cpu_details = os.uname().machine
+		}
+		arch_details << cpu_details
+	}
+	if os_kind == 'windows' {
+		arch_details << a.cmd(
+			command: 'wmic cpu get name /format:table'
+			line: 1
+		)
+	}
+	//
+	mut os_details := ''
+	wsl_check := a.cmd(command: 'cat /proc/sys/kernel/osrelease')
+	if os_kind == 'linux' {
+		os_details = a.get_linux_os_name()
+		if a.cpu_info('flags').contains('hypervisor') {
+			if wsl_check.contains('microsoft') {
+				// WSL 2 is a Managed VM and Full Linux Kernel
+				// See https://docs.microsoft.com/en-us/windows/wsl/compare-versions
+				os_details += ' (WSL 2)'
+			} else {
+				os_details += ' (VM)'
+			}
+		}
+		// WSL 1 is NOT a Managed VM and Full Linux Kernel
+		// See https://docs.microsoft.com/en-us/windows/wsl/compare-versions
+		if wsl_check.contains('Microsoft') {
+			os_details += ' (WSL)'
+		}
+		// From https://unix.stackexchange.com/a/14346
+		awk_cmd := '[ "$(awk \'\$5=="/" {print \$1}\' </proc/1/mountinfo)" != "$(awk \'\$5=="/" {print \$1}\' </proc/$$/mountinfo)" ] ; echo \$?'
+		if a.cmd(command: awk_cmd) == '0' {
+			os_details += ' (chroot)'
+		}
+	} else if os_kind == 'macos' {
+		mut details := []string{}
+		details << a.cmd(command: 'sw_vers -productName')
+		details << a.cmd(command: 'sw_vers -productVersion')
+		details << a.cmd(command: 'sw_vers -buildVersion')
+		os_details = details.join(', ')
+	} else if os_kind == 'windows' {
+		wmic_info := a.cmd(
+			command: 'wmic os get * /format:value'
+			line: -1
+		)
+		p := a.parse(wmic_info, '=')
+		caption, build_number, os_arch := p['caption'], p['buildnumber'], p['osarchitecture']
+		os_details = '$caption v$build_number $os_arch'
+	} else {
+		ouname := os.uname()
+		os_details = '$ouname.release, $ouname.version'
+	}
+	a.line('OS', '$os_kind, $os_details')
+	a.line('Processor', arch_details.join(', '))
+	a.line('CC version', a.cmd(command: 'cc --version'))
+	a.println('')
+	getwd := os.getwd()
+	vmodules := os.vmodules_dir()
+	vexe := os.getenv('VEXE')
+	vroot := os.dir(vexe)
+	os.chdir(vroot) or {}
+	a.line('getwd', getwd)
+	a.line('vmodules', vmodules)
+	a.line('vroot', vroot)
+	a.line('vexe', vexe)
+	a.line('vexe mtime', time.unix(os.file_last_mod_unix(vexe)).str())
+	a.line('is vroot writable', is_writable_dir(vroot).str())
+	a.line('is vmodules writable', is_writable_dir(vmodules).str())
+	a.line('V full version', version.full_v_version(true))
+	vtmp := os.getenv('VTMP')
+	if vtmp != '' {
+		a.line('env VTMP', '"$vtmp"')
+	}
+	vflags := os.getenv('VFLAGS')
+	if vflags != '' {
+		a.line('env VFLAGS', '"$vflags"')
+	}
+	a.println('')
+	a.line('Git version', a.cmd(command: 'git --version'))
+	a.line('Git vroot status', a.git_info())
+	a.line('.git/config present', os.is_file('.git/config').str())
+	//
+	a.report_tcc_version('thirdparty/tcc')
+}
+
+struct CmdConfig {
+	line    int
+	command string
+}
+
+fn (mut a App) cmd(c CmdConfig) string {
+	x := os.execute(c.command)
+	if x.exit_code < 0 {
+		return 'N/A'
+	}
+	if x.exit_code == 0 {
+		if c.line < 0 {
+			return x.output
+		}
+		output := x.output.split_into_lines()
+		if output.len > 0 && output.len > c.line {
+			return output[c.line]
+		}
+	}
+	return 'Error: $x.output'
+}
+
+fn (mut a App) line(label string, value string) {
+	a.println('$label: ${term.colorize(term.bold, value)}')
+}
+
+fn (app &App) parse(config string, sep string) map[string]string {
+	mut m := map[string]string{}
+	lines := config.split_into_lines()
+	for line in lines {
+		sline := line.trim_space()
+		if sline.len == 0 || sline[0] == `#` {
+			continue
+		}
+		x := sline.split(sep)
+		if x.len < 2 {
+			continue
+		}
+		m[x[0].trim_space().to_lower()] = x[1].trim_space().trim('"')
+	}
+	return m
+}
+
+fn (mut a App) get_linux_os_name() string {
+	mut os_details := ''
+	linux_os_methods := ['os-release', 'lsb_release', 'kernel', 'uname']
+	for m in linux_os_methods {
+		match m {
+			'os-release' {
+				if !os.is_file('/etc/os-release') {
+					continue
+				}
+				lines := os.read_file('/etc/os-release') or { continue }
+				vals := a.parse(lines, '=')
+				if vals['PRETTY_NAME'] == '' {
+					continue
+				}
+				os_details = vals['PRETTY_NAME']
+				break
+			}
+			'lsb_release' {
+				exists := a.cmd(command: 'type lsb_release')
+				if exists.starts_with('Error') {
+					continue
+				}
+				os_details = a.cmd(command: 'lsb_release -d -s')
+				break
+			}
+			'kernel' {
+				if !os.is_file('/proc/version') {
+					continue
+				}
+				os_details = a.cmd(command: 'cat /proc/version')
+				break
+			}
+			'uname' {
+				ouname := os.uname()
+				os_details = '$ouname.release, $ouname.version'
+				break
+			}
+			else {}
+		}
+	}
+	return os_details
+}
+
+fn (mut a App) cpu_info(key string) string {
+	if a.cached_cpuinfo.len > 0 {
+		return a.cached_cpuinfo[key]
+	}
+	info := os.execute('cat /proc/cpuinfo')
+	if info.exit_code != 0 {
+		return '`cat /proc/cpuinfo` could not run'
+	}
+	a.cached_cpuinfo = a.parse(info.output, ':')
+	return a.cached_cpuinfo[key]
+}
+
+fn (mut a App) git_info() string {
+	mut out := a.cmd(command: 'git -C . describe --abbrev=8 --dirty --always --tags').trim_space()
+	os.execute('git -C . remote add V_REPO https://github.com/vlang/v') // ignore failure (i.e. remote exists)
+	os.execute('git -C . fetch V_REPO')
+	commit_count := a.cmd(command: 'git rev-list @{0}...V_REPO/master --right-only --count').int()
+	if commit_count > 0 {
+		out += ' ($commit_count commit(s) behind V master)'
+	}
+	return out
+}
+
+fn (mut a App) report_tcc_version(tccfolder string) {
+	if !os.is_file(os.join_path(tccfolder, '.git', 'config')) {
+		a.line(tccfolder, 'N/A')
+		return
+	}
+	tcc_branch_name := a.cmd(command: 'git -C $tccfolder rev-parse --abbrev-ref HEAD')
+	tcc_commit := a.cmd(command: 'git -C $tccfolder describe --abbrev=8 --dirty --always --tags')
+	a.line('$tccfolder status', '$tcc_branch_name $tcc_commit')
+}
+
+fn (mut a App) report_info() {
+	for x in a.report_lines {
+		println(x)
+	}
+}
+
+fn is_writable_dir(path string) bool {
+	res := os.is_writable_folder(path) or { false }
+	return res
+}
+
+fn main() {
+	mut app := App{}
+	app.collect_info()
+	app.report_info()
+}
diff --git a/v_windows/v/cmd/tools/vfmt.v b/v_windows/v/cmd/tools/vfmt.v
new file mode 100644
index 0000000..ae10f1a
--- /dev/null
+++ b/v_windows/v/cmd/tools/vfmt.v
@@ -0,0 +1,334 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module main
+
+import os
+import os.cmdline
+import rand
+import term
+import v.ast
+import v.pref
+import v.fmt
+import v.util
+import v.util.diff
+import v.parser
+import vhelp
+
+struct FormatOptions {
+	is_l       bool
+	is_c       bool // NB: This refers to the '-c' fmt flag, NOT the C backend
+	is_w       bool
+	is_diff    bool
+	is_verbose bool
+	is_all     bool
+	is_debug   bool
+	is_noerror bool
+	is_verify  bool // exit(1) if the file is not vfmt'ed
+	is_worker  bool // true *only* in the worker processes. NB: workers can crash.
+}
+
+const (
+	formatted_file_token = '\@\@\@' + 'FORMATTED_FILE: '
+	vtmp_folder          = util.get_vtmp_folder()
+	term_colors          = term.can_show_color_on_stderr()
+)
+
+fn main() {
+	// if os.getenv('VFMT_ENABLE') == '' {
+	// eprintln('v fmt is disabled for now')
+	// exit(1)
+	// }
+	toolexe := os.executable()
+	util.set_vroot_folder(os.dir(os.dir(os.dir(toolexe))))
+	args := util.join_env_vflags_and_os_args()
+	mut foptions := FormatOptions{
+		is_c: '-c' in args
+		is_l: '-l' in args
+		is_w: '-w' in args
+		is_diff: '-diff' in args
+		is_verbose: '-verbose' in args || '--verbose' in args
+		is_all: '-all' in args || '--all' in args
+		is_worker: '-worker' in args
+		is_debug: '-debug' in args
+		is_noerror: '-noerror' in args
+		is_verify: '-verify' in args
+	}
+	if term_colors {
+		os.setenv('VCOLORS', 'always', true)
+	}
+	if foptions.is_verbose {
+		eprintln('vfmt foptions: $foptions')
+	}
+	if foptions.is_worker {
+		// -worker should be added by a parent vfmt process.
+		// We launch a sub process for each file because
+		// the v compiler can do an early exit if it detects
+		// a syntax error, but we want to process ALL passed
+		// files if possible.
+		foptions.format_file(cmdline.option(args, '-worker', ''))
+		exit(0)
+	}
+	// we are NOT a worker at this stage, i.e. we are a parent vfmt process
+	possible_files := cmdline.only_non_options(cmdline.options_after(args, ['fmt']))
+	if foptions.is_verbose {
+		eprintln('vfmt toolexe: $toolexe')
+		eprintln('vfmt args: ' + os.args.str())
+		eprintln('vfmt env_vflags_and_os_args: ' + args.str())
+		eprintln('vfmt possible_files: ' + possible_files.str())
+	}
+	files := util.find_all_v_files(possible_files) or {
+		verror(err.msg)
+		return
+	}
+	if os.is_atty(0) == 0 && files.len == 0 {
+		foptions.format_pipe()
+		exit(0)
+	}
+	if files.len == 0 || '-help' in args || '--help' in args {
+		vhelp.show_topic('fmt')
+		exit(0)
+	}
+	mut cli_args_no_files := []string{}
+	for a in os.args {
+		if a !in files {
+			cli_args_no_files << a
+		}
+	}
+	mut errors := 0
+	for file in files {
+		fpath := os.real_path(file)
+		mut worker_command_array := cli_args_no_files.clone()
+		worker_command_array << ['-worker', util.quote_path(fpath)]
+		worker_cmd := worker_command_array.join(' ')
+		if foptions.is_verbose {
+			eprintln('vfmt worker_cmd: $worker_cmd')
+		}
+		worker_result := os.execute(worker_cmd)
+		// Guard against a possibly crashing worker process.
+		if worker_result.exit_code != 0 {
+			eprintln(worker_result.output)
+			if worker_result.exit_code == 1 {
+				eprintln('Internal vfmt error while formatting file: ${file}.')
+			}
+			errors++
+			continue
+		}
+		if worker_result.output.len > 0 {
+			if worker_result.output.contains(formatted_file_token) {
+				wresult := worker_result.output.split(formatted_file_token)
+				formatted_warn_errs := wresult[0]
+				formatted_file_path := wresult[1].trim_right('\n\r')
+				foptions.post_process_file(fpath, formatted_file_path) or { errors = errors + 1 }
+				if formatted_warn_errs.len > 0 {
+					eprintln(formatted_warn_errs)
+				}
+				continue
+			}
+		}
+		errors++
+	}
+	if errors > 0 {
+		eprintln('Encountered a total of: $errors errors.')
+		if foptions.is_noerror {
+			exit(0)
+		}
+		if foptions.is_verify {
+			exit(1)
+		}
+		if foptions.is_c {
+			exit(2)
+		}
+		exit(1)
+	}
+}
+
+fn (foptions &FormatOptions) format_file(file string) {
+	mut prefs := pref.new_preferences()
+	prefs.is_fmt = true
+	if foptions.is_verbose {
+		eprintln('vfmt2 running fmt.fmt over file: $file')
+	}
+	table := ast.new_table()
+	// checker := checker.new_checker(table, prefs)
+	file_ast := parser.parse_file(file, table, .parse_comments, prefs)
+	// checker.check(file_ast)
+	formatted_content := fmt.fmt(file_ast, table, prefs, foptions.is_debug)
+	file_name := os.file_name(file)
+	ulid := rand.ulid()
+	vfmt_output_path := os.join_path(vtmp_folder, 'vfmt_${ulid}_$file_name')
+	os.write_file(vfmt_output_path, formatted_content) or { panic(err) }
+	if foptions.is_verbose {
+		eprintln('fmt.fmt worked and $formatted_content.len bytes were written to $vfmt_output_path .')
+	}
+	eprintln('$formatted_file_token$vfmt_output_path')
+}
+
+fn (foptions &FormatOptions) format_pipe() {
+	mut prefs := pref.new_preferences()
+	prefs.is_fmt = true
+	if foptions.is_verbose {
+		eprintln('vfmt2 running fmt.fmt over stdin')
+	}
+	input_text := os.get_raw_lines_joined()
+	table := ast.new_table()
+	// checker := checker.new_checker(table, prefs)
+	file_ast := parser.parse_text(input_text, '', table, .parse_comments, prefs)
+	// checker.check(file_ast)
+	formatted_content := fmt.fmt(file_ast, table, prefs, foptions.is_debug)
+	print(formatted_content)
+	if foptions.is_verbose {
+		eprintln('fmt.fmt worked and $formatted_content.len bytes were written to stdout.')
+	}
+}
+
+fn print_compiler_options(compiler_params &pref.Preferences) {
+	eprintln('         os: ' + compiler_params.os.str())
+	eprintln('  ccompiler: $compiler_params.ccompiler')
+	eprintln('       path: $compiler_params.path ')
+	eprintln('   out_name: $compiler_params.out_name ')
+	eprintln('      vroot: $compiler_params.vroot ')
+	eprintln('lookup_path: $compiler_params.lookup_path ')
+	eprintln('   out_name: $compiler_params.out_name ')
+	eprintln('     cflags: $compiler_params.cflags ')
+	eprintln('    is_test: $compiler_params.is_test ')
+	eprintln('  is_script: $compiler_params.is_script ')
+}
+
+fn (foptions &FormatOptions) post_process_file(file string, formatted_file_path string) ? {
+	if formatted_file_path.len == 0 {
+		return
+	}
+	if foptions.is_diff {
+		diff_cmd := diff.find_working_diff_command() or {
+			eprintln(err)
+			return
+		}
+		if foptions.is_verbose {
+			eprintln('Using diff command: $diff_cmd')
+		}
+		diff := diff.color_compare_files(diff_cmd, file, formatted_file_path)
+		if diff.len > 0 {
+			println(diff)
+		}
+		return
+	}
+	if foptions.is_verify {
+		diff_cmd := diff.find_working_diff_command() or {
+			eprintln(err)
+			return
+		}
+		x := diff.color_compare_files(diff_cmd, file, formatted_file_path)
+		if x.len != 0 {
+			println("$file is not vfmt'ed")
+			return error('')
+		}
+		return
+	}
+	fc := os.read_file(file) or {
+		eprintln('File $file could not be read')
+		return
+	}
+	formatted_fc := os.read_file(formatted_file_path) or {
+		eprintln('File $formatted_file_path could not be read')
+		return
+	}
+	is_formatted_different := fc != formatted_fc
+	if foptions.is_c {
+		if is_formatted_different {
+			eprintln('File is not formatted: $file')
+			return error('')
+		}
+		return
+	}
+	if foptions.is_l {
+		if is_formatted_different {
+			eprintln('File needs formatting: $file')
+		}
+		return
+	}
+	if foptions.is_w {
+		if is_formatted_different {
+			os.mv_by_cp(formatted_file_path, file) or { panic(err) }
+			eprintln('Reformatted file: $file')
+		} else {
+			eprintln('Already formatted file: $file')
+		}
+		return
+	}
+	print(formatted_fc)
+}
+
+fn (f FormatOptions) str() string {
+	return
+		'FormatOptions{ is_l: $f.is_l, is_w: $f.is_w, is_diff: $f.is_diff, is_verbose: $f.is_verbose,' +
+		' is_all: $f.is_all, is_worker: $f.is_worker, is_debug: $f.is_debug, is_noerror: $f.is_noerror,' +
+		' is_verify: $f.is_verify" }'
+}
+
+fn file_to_mod_name_and_is_module_file(file string) (string, bool) {
+	mut mod_name := 'main'
+	mut is_module_file := false
+	flines := read_source_lines(file) or { return mod_name, is_module_file }
+	for fline in flines {
+		line := fline.trim_space()
+		if line.starts_with('module ') {
+			if !line.starts_with('module main') {
+				is_module_file = true
+				mod_name = line.replace('module ', ' ').trim_space()
+			}
+			break
+		}
+	}
+	return mod_name, is_module_file
+}
+
+fn read_source_lines(file string) ?[]string {
+	source_lines := os.read_lines(file) or { return error('can not read $file') }
+	return source_lines
+}
+
+fn get_compile_name_of_potential_v_project(file string) string {
+	// This function get_compile_name_of_potential_v_project returns:
+	// a) the file's folder, if file is part of a v project
+	// b) the file itself, if the file is a standalone v program
+	pfolder := os.real_path(os.dir(file))
+	// a .v project has many 'module main' files in one folder
+	// if there is only one .v file, then it must be a standalone
+	all_files_in_pfolder := os.ls(pfolder) or { panic(err) }
+	mut vfiles := []string{}
+	for f in all_files_in_pfolder {
+		vf := os.join_path(pfolder, f)
+		if f.starts_with('.') || !f.ends_with('.v') || os.is_dir(vf) {
+			continue
+		}
+		vfiles << vf
+	}
+	if vfiles.len == 1 {
+		return file
+	}
+	// /////////////////////////////////////////////////////////////
+	// At this point, we know there are many .v files in the folder
+	// We will have to read them all, and if there are more than one
+	// containing `fn main` then the folder contains multiple standalone
+	// v programs. If only one contains `fn main` then the folder is
+	// a project folder, that should be compiled with `v pfolder`.
+	mut main_fns := 0
+	for f in vfiles {
+		slines := read_source_lines(f) or { panic(err) }
+		for line in slines {
+			if line.contains('fn main()') {
+				main_fns++
+				if main_fns > 1 {
+					return file
+				}
+			}
+		}
+	}
+	return pfolder
+}
+
+[noreturn]
+fn verror(s string) {
+	util.verror('vfmt error', s)
+}
diff --git a/v_windows/v/cmd/tools/vpm.exe b/v_windows/v/cmd/tools/vpm.exe
new file mode 100644
index 0000000..7c23db4
--- /dev/null
+++ b/v_windows/v/cmd/tools/vpm.exe
diff --git a/v_windows/v/cmd/tools/vpm.v b/v_windows/v/cmd/tools/vpm.v
new file mode 100644
index 0000000..a1c8eaf
--- /dev/null
+++ b/v_windows/v/cmd/tools/vpm.v
@@ -0,0 +1,698 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module main
+
+import os
+import os.cmdline
+import net.http
+import json
+import vhelp
+import v.vmod
+
+const (
+	default_vpm_server_urls   = ['https://vpm.vlang.io']
+	valid_vpm_commands        = ['help', 'search', 'install', 'update', 'upgrade', 'outdated',
+		'list', 'remove', 'show']
+	excluded_dirs             = ['cache', 'vlib']
+	supported_vcs_systems     = ['git', 'hg']
+	supported_vcs_folders     = ['.git', '.hg']
+	supported_vcs_update_cmds = {
+		'git': 'git pull'
+		'hg':  'hg pull --update'
+	}
+	supported_vcs_install_cmds = {
+		'git': 'git clone --depth=1'
+		'hg':  'hg clone'
+	}
+	supported_vcs_outdated_steps = {
+		'git': ['git fetch', 'git rev-parse @', 'git rev-parse @{u}']
+		'hg':  ['hg incoming']
+	}
+)
+
+struct Mod {
+	id           int
+	name         string
+	url          string
+	nr_downloads int
+	vcs          string
+}
+
+struct Vmod {
+mut:
+	name    string
+	version string
+	deps    []string
+}
+
+enum Source {
+	git
+	hg
+	vpm
+}
+
+fn main() {
+	init_settings()
+	// This tool is intended to be launched by the v frontend,
+	// which provides the path to V inside os.getenv('VEXE')
+	// args are: vpm [options] SUBCOMMAND module names
+	params := cmdline.only_non_options(os.args[1..])
+	options := cmdline.only_options(os.args[1..])
+	verbose_println('cli params: $params')
+	if params.len < 1 {
+		vpm_help()
+		exit(5)
+	}
+	vpm_command := params[0]
+	mut module_names := params[1..]
+	ensure_vmodules_dir_exist()
+	// println('module names: ') println(module_names)
+	match vpm_command {
+		'help' {
+			vpm_help()
+		}
+		'search' {
+			vpm_search(module_names)
+		}
+		'install' {
+			if module_names.len == 0 && os.exists('./v.mod') {
+				println('Detected v.mod file inside the project directory. Using it...')
+				manifest := vmod.from_file('./v.mod') or { panic(err) }
+				module_names = manifest.dependencies
+			}
+			mut source := Source.vpm
+			if '--git' in options {
+				source = Source.git
+			}
+			if '--hg' in options {
+				source = Source.hg
+			}
+
+			vpm_install(module_names, source)
+		}
+		'update' {
+			vpm_update(module_names)
+		}
+		'upgrade' {
+			vpm_upgrade()
+		}
+		'outdated' {
+			vpm_outdated()
+		}
+		'list' {
+			vpm_list()
+		}
+		'remove' {
+			vpm_remove(module_names)
+		}
+		'show' {
+			vpm_show(module_names)
+		}
+		else {
+			println('Error: you tried to run "v $vpm_command"')
+			println('... but the v package management tool vpm only knows about these commands:')
+			for validcmd in valid_vpm_commands {
+				println('    v $validcmd')
+			}
+			exit(3)
+		}
+	}
+}
+
+fn vpm_search(keywords []string) {
+	search_keys := keywords.map(it.replace('_', '-'))
+	if settings.is_help {
+		vhelp.show_topic('search')
+		exit(0)
+	}
+	if search_keys.len == 0 {
+		println('´v search´ requires *at least one* keyword.')
+		exit(2)
+	}
+	modules := get_all_modules()
+	installed_modules := get_installed_modules()
+	joined := search_keys.join(', ')
+	mut index := 0
+	for mod in modules {
+		// TODO for some reason .filter results in substr error, so do it manually
+		for k in search_keys {
+			if !mod.contains(k) {
+				continue
+			}
+			if index == 0 {
+				println('Search results for "$joined":\n')
+			}
+			index++
+			mut parts := mod.split('.')
+			// in case the author isn't present
+			if parts.len == 1 {
+				parts << parts[0]
+				parts[0] = ' '
+			} else {
+				parts[0] = ' by ${parts[0]} '
+			}
+			installed := if mod in installed_modules { ' (installed)' } else { '' }
+			println('${index}. ${parts[1]}${parts[0]}[$mod]$installed')
+			break
+		}
+	}
+	if index == 0 {
+		vexe := os.getenv('VEXE')
+		vroot := os.real_path(os.dir(vexe))
+		mut messages := ['No module(s) found for `$joined` .']
+		for vlibmod in search_keys {
+			if os.is_dir(os.join_path(vroot, 'vlib', vlibmod)) {
+				messages << 'There is already an existing "$vlibmod" module in vlib, so you can just `import $vlibmod` .'
+			}
+		}
+		for m in messages {
+			println(m)
+		}
+	} else {
+		println('\nUse "v install author_name.module_name" to install the module.')
+	}
+}
+
+fn vpm_install_from_vpm(module_names []string) {
+	mut errors := 0
+	for n in module_names {
+		name := n.trim_space().replace('_', '-')
+		mod := get_module_meta_info(name) or {
+			errors++
+			println('Errors while retrieving meta data for module $name:')
+			println(err)
+			continue
+		}
+		mut vcs := mod.vcs
+		if vcs == '' {
+			vcs = supported_vcs_systems[0]
+		}
+		if vcs !in supported_vcs_systems {
+			errors++
+			println('Skipping module "$name", since it uses an unsupported VCS {$vcs} .')
+			continue
+		}
+
+		mod_name_as_path := mod.name.replace('.', os.path_separator).replace('-', '_').to_lower()
+		final_module_path := os.real_path(os.join_path(settings.vmodules_path, mod_name_as_path))
+		if os.exists(final_module_path) {
+			vpm_update([name])
+			continue
+		}
+		println('Installing module "$name" from $mod.url to $final_module_path ...')
+		vcs_install_cmd := supported_vcs_install_cmds[vcs]
+		cmd := '$vcs_install_cmd "$mod.url" "$final_module_path"'
+		verbose_println('      command: $cmd')
+		cmdres := os.execute(cmd)
+		if cmdres.exit_code != 0 {
+			errors++
+			println('Failed installing module "$name" to "$final_module_path" .')
+			verbose_println('Failed command: $cmd')
+			verbose_println('Failed command output:\n$cmdres.output')
+			continue
+		}
+		resolve_dependencies(name, final_module_path, module_names)
+	}
+	if errors > 0 {
+		exit(1)
+	}
+}
+
+fn vpm_install_from_vcs(module_names []string, vcs_key string) {
+	mut errors := 0
+	for n in module_names {
+		url := n.trim_space()
+
+		first_cut_pos := url.last_index('/') or {
+			errors++
+			println('Errors while retrieving name for module $url:')
+			println(err)
+			continue
+		}
+
+		mod_name := url.substr(first_cut_pos + 1, url.len)
+
+		second_cut_pos := url.substr(0, first_cut_pos).last_index('/') or {
+			errors++
+			println('Errors while retrieving name for module $url:')
+			println(err)
+			continue
+		}
+
+		repo_name := url.substr(second_cut_pos + 1, first_cut_pos)
+		mut name := repo_name + os.path_separator + mod_name
+		mod_name_as_path := name.replace('-', '_').to_lower()
+		mut final_module_path := os.real_path(os.join_path(settings.vmodules_path, mod_name_as_path))
+		if os.exists(final_module_path) {
+			vpm_update([name.replace('-', '_')])
+			continue
+		}
+		println('Installing module "$name" from $url to $final_module_path ...')
+		vcs_install_cmd := supported_vcs_install_cmds[vcs_key]
+		cmd := '$vcs_install_cmd "$url" "$final_module_path"'
+		verbose_println('      command: $cmd')
+		cmdres := os.execute(cmd)
+		if cmdres.exit_code != 0 {
+			errors++
+			println('Failed installing module "$name" to "$final_module_path" .')
+			verbose_println('Failed command: $cmd')
+			verbose_println('Failed command output:\n$cmdres.output')
+			continue
+		}
+		vmod_path := os.join_path(final_module_path, 'v.mod')
+		if os.exists(vmod_path) {
+			data := os.read_file(vmod_path) or { return }
+			vmod := parse_vmod(data)
+			mod_path := os.real_path(os.join_path(settings.vmodules_path, vmod.name.replace('.',
+				os.path_separator)))
+			println('Relocating module from "$name" to "$vmod.name" ( $mod_path ) ...')
+			if os.exists(mod_path) {
+				println('Warning module "$mod_path" already exsits!')
+				println('Removing module "$mod_path" ...')
+				os.rmdir_all(mod_path) or {
+					errors++
+					println('Errors while removing "$mod_path" :')
+					println(err)
+					continue
+				}
+			}
+			os.mv(final_module_path, mod_path) or {
+				errors++
+				println('Errors while relocating module "$name" :')
+				println(err)
+				os.rmdir_all(final_module_path) or {
+					errors++
+					println('Errors while removing "$final_module_path" :')
+					println(err)
+					continue
+				}
+				continue
+			}
+			println('Module "$name" relocated to "$vmod.name" successfully.')
+			final_module_path = mod_path
+			name = vmod.name
+		}
+		resolve_dependencies(name, final_module_path, module_names)
+	}
+	if errors > 0 {
+		exit(1)
+	}
+}
+
+fn vpm_install(module_names []string, source Source) {
+	if settings.is_help {
+		vhelp.show_topic('install')
+		exit(0)
+	}
+	if module_names.len == 0 {
+		println('´v install´ requires *at least one* module name.')
+		exit(2)
+	}
+
+	if source == .vpm {
+		vpm_install_from_vpm(module_names)
+	}
+	if source == .git {
+		vpm_install_from_vcs(module_names, 'git')
+	}
+	if source == .hg {
+		vpm_install_from_vcs(module_names, 'hg')
+	}
+}
+
+fn vpm_update(m []string) {
+	mut module_names := m.clone()
+	if settings.is_help {
+		vhelp.show_topic('update')
+		exit(0)
+	}
+	if module_names.len == 0 {
+		module_names = get_installed_modules()
+	}
+	mut errors := 0
+	for name in module_names {
+		final_module_path := valid_final_path_of_existing_module(name) or { continue }
+		os.chdir(final_module_path) or {}
+		println('Updating module "$name"...')
+		verbose_println('  work folder: $final_module_path')
+		vcs := vcs_used_in_dir(final_module_path) or { continue }
+		vcs_cmd := supported_vcs_update_cmds[vcs[0]]
+		verbose_println('    command: $vcs_cmd')
+		vcs_res := os.execute('$vcs_cmd')
+		if vcs_res.exit_code != 0 {
+			errors++
+			println('Failed updating module "$name".')
+			verbose_println('Failed command: $vcs_cmd')
+			verbose_println('Failed details:\n$vcs_res.output')
+			continue
+		} else {
+			verbose_println('    $vcs_res.output.trim_space()')
+		}
+		resolve_dependencies(name, final_module_path, module_names)
+	}
+	if errors > 0 {
+		exit(1)
+	}
+}
+
+fn get_outdated() ?[]string {
+	module_names := get_installed_modules()
+	mut outdated := []string{}
+	for name in module_names {
+		final_module_path := valid_final_path_of_existing_module(name) or { continue }
+		os.chdir(final_module_path) or {}
+		vcs := vcs_used_in_dir(final_module_path) or { continue }
+		vcs_cmd_steps := supported_vcs_outdated_steps[vcs[0]]
+		mut outputs := []string{}
+		for step in vcs_cmd_steps {
+			res := os.execute(step)
+			if res.exit_code < 0 {
+				verbose_println('Error command: $step')
+				verbose_println('Error details:\n$res.output')
+				return error('Error while checking latest commits for "$name".')
+			}
+			if vcs[0] == 'hg' {
+				if res.exit_code == 1 {
+					outdated << name
+				}
+			} else {
+				outputs << res.output
+			}
+		}
+		if vcs[0] == 'git' && outputs[1] != outputs[2] {
+			outdated << name
+		}
+	}
+	return outdated
+}
+
+fn vpm_upgrade() {
+	outdated := get_outdated() or { exit(1) }
+	if outdated.len > 0 {
+		vpm_update(outdated)
+	} else {
+		println('Modules are up to date.')
+	}
+}
+
+fn vpm_outdated() {
+	outdated := get_outdated() or { exit(1) }
+	if outdated.len > 0 {
+		println('Outdated modules:')
+		for m in outdated {
+			println('  $m')
+		}
+	} else {
+		println('Modules are up to date.')
+	}
+}
+
+fn vpm_list() {
+	module_names := get_installed_modules()
+	if module_names.len == 0 {
+		println('You have no modules installed.')
+		exit(0)
+	}
+	println('Installed modules:')
+	for mod in module_names {
+		println('  $mod')
+	}
+}
+
+fn vpm_remove(module_names []string) {
+	if settings.is_help {
+		vhelp.show_topic('remove')
+		exit(0)
+	}
+	if module_names.len == 0 {
+		println('´v remove´ requires *at least one* module name.')
+		exit(2)
+	}
+	for name in module_names {
+		final_module_path := valid_final_path_of_existing_module(name) or { continue }
+		println('Removing module "$name"...')
+		verbose_println('removing folder $final_module_path')
+		os.rmdir_all(final_module_path) or {
+			verbose_println('error while removing "$final_module_path": $err.msg')
+		}
+		// delete author directory if it is empty
+		author := name.split('.')[0]
+		author_dir := os.real_path(os.join_path(settings.vmodules_path, author))
+		if !os.exists(author_dir) {
+			continue
+		}
+		if os.is_dir_empty(author_dir) {
+			verbose_println('removing author folder $author_dir')
+			os.rmdir(author_dir) or {
+				verbose_println('error while removing "$author_dir": $err.msg')
+			}
+		}
+	}
+}
+
+fn valid_final_path_of_existing_module(name string) ?string {
+	mod_name_as_path := name.replace('.', os.path_separator).replace('-', '_').to_lower()
+	name_of_vmodules_folder := os.join_path(settings.vmodules_path, mod_name_as_path)
+	final_module_path := os.real_path(name_of_vmodules_folder)
+	if !os.exists(final_module_path) {
+		println('No module with name "$name" exists at $name_of_vmodules_folder')
+		return none
+	}
+	if !os.is_dir(final_module_path) {
+		println('Skipping "$name_of_vmodules_folder", since it is not a folder.')
+		return none
+	}
+	vcs_used_in_dir(final_module_path) or {
+		println('Skipping "$name_of_vmodules_folder", since it does not use a supported vcs.')
+		return none
+	}
+	return final_module_path
+}
+
+fn ensure_vmodules_dir_exist() {
+	if !os.is_dir(settings.vmodules_path) {
+		println('Creating $settings.vmodules_path/ ...')
+		os.mkdir(settings.vmodules_path) or { panic(err) }
+	}
+}
+
+fn vpm_help() {
+	vhelp.show_topic('vpm')
+}
+
+fn vcs_used_in_dir(dir string) ?[]string {
+	mut vcs := []string{}
+	for repo_subfolder in supported_vcs_folders {
+		checked_folder := os.real_path(os.join_path(dir, repo_subfolder))
+		if os.is_dir(checked_folder) {
+			vcs << repo_subfolder.replace('.', '')
+		}
+	}
+	if vcs.len == 0 {
+		return none
+	}
+	return vcs
+}
+
+fn get_installed_modules() []string {
+	dirs := os.ls(settings.vmodules_path) or { return [] }
+	mut modules := []string{}
+	for dir in dirs {
+		adir := os.join_path(settings.vmodules_path, dir)
+		if dir in excluded_dirs || !os.is_dir(adir) {
+			continue
+		}
+		if os.exists(os.join_path(adir, 'v.mod')) && os.exists(os.join_path(adir, '.git', 'config')) {
+			// an official vlang module with a short module name, like `vsl`, `ui` or `markdown`
+			modules << dir
+			continue
+		}
+		author := dir
+		mods := os.ls(adir) or { continue }
+		for m in mods {
+			vcs_used_in_dir(os.join_path(adir, m)) or { continue }
+			modules << '${author}.$m'
+		}
+	}
+	return modules
+}
+
+fn get_all_modules() []string {
+	url := get_working_server_url()
+	r := http.get(url) or { panic(err) }
+	if r.status_code != 200 {
+		println('Failed to search vpm.vlang.io. Status code: $r.status_code')
+		exit(1)
+	}
+	s := r.text
+	mut read_len := 0
+	mut modules := []string{}
+	for read_len < s.len {
+		mut start_token := '<a href="/mod'
+		end_token := '</a>'
+		// get the start index of the module entry
+		mut start_index := s.index_after(start_token, read_len)
+		if start_index == -1 {
+			break
+		}
+		// get the index of the end of anchor (a) opening tag
+		// we use the previous start_index to make sure we are getting a module and not just a random 'a' tag
+		start_token = '">'
+		start_index = s.index_after(start_token, start_index) + start_token.len
+		// get the index of the end of module entry
+		end_index := s.index_after(end_token, start_index)
+		if end_index == -1 {
+			break
+		}
+		modules << s[start_index..end_index]
+		read_len = end_index
+		if read_len >= s.len {
+			break
+		}
+	}
+	return modules
+}
+
+fn resolve_dependencies(name string, module_path string, module_names []string) {
+	vmod_path := os.join_path(module_path, 'v.mod')
+	if !os.exists(vmod_path) {
+		return
+	}
+	data := os.read_file(vmod_path) or { return }
+	vmod := parse_vmod(data)
+	mut deps := []string{}
+	// filter out dependencies that were already specified by the user
+	for d in vmod.deps {
+		if d !in module_names {
+			deps << d
+		}
+	}
+	if deps.len > 0 {
+		println('Resolving $deps.len dependencies for module "$name"...')
+		verbose_println('Found dependencies: $deps')
+		vpm_install(deps, Source.vpm)
+	}
+}
+
+fn parse_vmod(data string) Vmod {
+	manifest := vmod.decode(data) or { vmod.Manifest{} }
+	mut vmod := Vmod{}
+	vmod.name = manifest.name
+	vmod.version = manifest.version
+	vmod.deps = manifest.dependencies
+	return vmod
+}
+
+fn get_working_server_url() string {
+	server_urls := if settings.server_urls.len > 0 {
+		settings.server_urls
+	} else {
+		default_vpm_server_urls
+	}
+	for url in server_urls {
+		verbose_println('Trying server url: $url')
+		http.head(url) or {
+			verbose_println('                   $url failed.')
+			continue
+		}
+		return url
+	}
+	panic('No responding vpm server found. Please check your network connectivity and try again later.')
+}
+
+// settings context:
+struct VpmSettings {
+mut:
+	is_help       bool
+	is_verbose    bool
+	server_urls   []string
+	vmodules_path string
+}
+
+const (
+	settings = &VpmSettings{}
+)
+
+fn init_settings() {
+	mut s := &VpmSettings(0)
+	unsafe {
+		s = settings
+	}
+	s.is_help = '-h' in os.args || '--help' in os.args || 'help' in os.args
+	s.is_verbose = '-v' in os.args
+	s.server_urls = cmdline.options(os.args, '-server-url')
+	s.vmodules_path = os.vmodules_dir()
+}
+
+fn verbose_println(s string) {
+	if settings.is_verbose {
+		println(s)
+	}
+}
+
+fn get_module_meta_info(name string) ?Mod {
+	mut errors := []string{}
+	for server_url in default_vpm_server_urls {
+		modurl := server_url + '/jsmod/$name'
+		verbose_println('Retrieving module metadata from: $modurl ...')
+		r := http.get(modurl) or {
+			errors << 'Http server did not respond to our request for ${modurl}.'
+			errors << 'Error details: $err'
+			continue
+		}
+		if r.status_code == 404 || r.text.trim_space() == '404' {
+			errors << 'Skipping module "$name", since $server_url reported that "$name" does not exist.'
+			continue
+		}
+		if r.status_code != 200 {
+			errors << 'Skipping module "$name", since $server_url responded with $r.status_code http status code. Please try again later.'
+			continue
+		}
+		s := r.text
+		if s.len > 0 && s[0] != `{` {
+			errors << 'Invalid json data'
+			errors << s.trim_space().limit(100) + '...'
+			continue
+		}
+		mod := json.decode(Mod, s) or {
+			errors << 'Skipping module "$name", since its information is not in json format.'
+			continue
+		}
+		if '' == mod.url || '' == mod.name {
+			errors << 'Skipping module "$name", since it is missing name or url information.'
+			continue
+		}
+		return mod
+	}
+	return error(errors.join_lines())
+}
+
+fn vpm_show(module_names []string) {
+	installed_modules := get_installed_modules()
+	for module_name in module_names {
+		if module_name !in installed_modules {
+			module_meta_info := get_module_meta_info(module_name) or { continue }
+			print('
+Name: $module_meta_info.name
+Homepage: $module_meta_info.url
+Downloads: $module_meta_info.nr_downloads
+Installed: False
+--------
+')
+			continue
+		}
+		path := os.join_path(os.vmodules_dir(), module_name.replace('.', os.path_separator))
+		mod := vmod.from_file(os.join_path(path, 'v.mod')) or { continue }
+		print('Name: $mod.name
+Version: $mod.version
+Description: $mod.description
+Homepage: $mod.repo_url
+Author: $mod.author
+License: $mod.license
+Location: $path
+Requires: ${mod.dependencies.join(', ')}
+--------
+')
+	}
+}
diff --git a/v_windows/v/cmd/tools/vrepl.exe b/v_windows/v/cmd/tools/vrepl.exe
new file mode 100644
index 0000000..137f9ae
--- /dev/null
+++ b/v_windows/v/cmd/tools/vrepl.exe
diff --git a/v_windows/v/cmd/tools/vrepl.v b/v_windows/v/cmd/tools/vrepl.v
new file mode 100644
index 0000000..701d453
--- /dev/null
+++ b/v_windows/v/cmd/tools/vrepl.v
@@ -0,0 +1,390 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module main
+
+import os
+import term
+import rand
+import readline
+import os.cmdline
+import v.util.version
+
+struct Repl {
+mut:
+	readline readline.Readline
+	indent   int    // indentation level
+	in_func  bool   // are we inside a new custom user function
+	line     string // the current line entered by the user
+	//
+	modules        []string // all the import modules
+	includes       []string // all the #include statements
+	functions      []string // all the user function declarations
+	functions_name []string // all the user function names
+	lines          []string // all the other lines/statements
+	temp_lines     []string // all the temporary expressions/printlns
+	vstartup_lines []string // lines in the `VSTARTUP` file
+}
+
+const is_stdin_a_pipe = (os.is_atty(0) == 0)
+
+const vexe = os.getenv('VEXE')
+
+const vstartup = os.getenv('VSTARTUP')
+
+fn new_repl() Repl {
+	return Repl{
+		readline: readline.Readline{}
+		modules: ['os', 'time', 'math']
+		vstartup_lines: os.read_file(vstartup) or { '' }.trim_right('\n\r').split_into_lines()
+	}
+}
+
+fn (mut r Repl) checks() bool {
+	mut in_string := false
+	was_indent := r.indent > 0
+	for i := 0; i < r.line.len; i++ {
+		if r.line[i] == `'` && (i == 0 || r.line[i - 1] != `\\`) {
+			in_string = !in_string
+		}
+		if r.line[i] == `{` && !in_string {
+			r.line = r.line[..i + 1] + '\n' + r.line[i + 1..]
+			i++
+			r.indent++
+		}
+		if r.line[i] == `}` && !in_string {
+			r.line = r.line[..i] + '\n' + r.line[i..]
+			i++
+			r.indent--
+			if r.indent == 0 {
+				r.in_func = false
+			}
+		}
+		if i + 2 < r.line.len && r.indent == 0 && r.line[i + 1] == `f` && r.line[i + 2] == `n` {
+			r.in_func = true
+		}
+	}
+	return r.in_func || (was_indent && r.indent <= 0) || r.indent > 0
+}
+
+fn (r &Repl) function_call(line string) bool {
+	for function in r.functions_name {
+		is_function_definition := line.replace(' ', '').starts_with('$function:=')
+		if line.starts_with(function) && !is_function_definition {
+			return true
+		}
+	}
+	return false
+}
+
+fn (r &Repl) current_source_code(should_add_temp_lines bool, not_add_print bool) string {
+	mut all_lines := []string{}
+	for mod in r.modules {
+		all_lines << 'import $mod\n'
+	}
+	if vstartup != '' {
+		mut lines := []string{}
+		if !not_add_print {
+			lines = r.vstartup_lines.filter(!it.starts_with('print'))
+		} else {
+			lines = r.vstartup_lines
+		}
+		all_lines << lines
+	}
+	all_lines << r.includes
+	all_lines << r.functions
+	all_lines << r.lines
+
+	if should_add_temp_lines {
+		all_lines << r.temp_lines
+	}
+	return all_lines.join('\n')
+}
+
+fn repl_help() {
+	println(version.full_v_version(false))
+	println('
+	|help                   Displays this information.
+	|list                   Show the program so far.
+	|reset                  Clears the accumulated program, so you can start a fresh.
+	|Ctrl-C, Ctrl-D, exit   Exits the REPL.
+	|clear                  Clears the screen.
+'.strip_margin())
+}
+
+fn run_repl(workdir string, vrepl_prefix string) {
+	if !is_stdin_a_pipe {
+		println(version.full_v_version(false))
+		println('Use Ctrl-C or ${term.highlight_command('exit')} to exit, or ${term.highlight_command('help')} to see other available commands')
+	}
+
+	if vstartup != '' {
+		result := repl_run_vfile(vstartup) or {
+			os.Result{
+				output: '$vstartup file not found'
+			}
+		}
+		print('\n')
+		print_output(result)
+	}
+
+	file := os.join_path(workdir, '.${vrepl_prefix}vrepl.v')
+	temp_file := os.join_path(workdir, '.${vrepl_prefix}vrepl_temp.v')
+	mut prompt := '>>> '
+	defer {
+		if !is_stdin_a_pipe {
+			println('')
+		}
+		cleanup_files([file, temp_file])
+	}
+	mut r := new_repl()
+	for {
+		if r.indent == 0 {
+			prompt = '>>> '
+		} else {
+			prompt = '... '
+		}
+		oline := r.get_one_line(prompt) or { break }
+		line := oline.trim_space()
+		if line == '' && oline.ends_with('\n') {
+			continue
+		}
+		if line.len <= -1 || line == '' || line == 'exit' {
+			break
+		}
+		r.line = line
+		if r.line == '\n' {
+			continue
+		}
+		if r.line == 'clear' {
+			term.erase_clear()
+			continue
+		}
+		if r.line == 'help' {
+			repl_help()
+			continue
+		}
+		if r.line.contains(':=') && r.line.contains('fn(') {
+			r.in_func = true
+			r.functions_name << r.line.all_before(':= fn(').trim_space()
+		}
+		if r.line.starts_with('fn') {
+			r.in_func = true
+			r.functions_name << r.line.all_after('fn').all_before('(').trim_space()
+		}
+		was_func := r.in_func
+		if r.checks() {
+			for rline in r.line.split('\n') {
+				if r.in_func || was_func {
+					r.functions << rline
+				} else {
+					r.temp_lines << rline
+				}
+			}
+			if r.indent > 0 {
+				continue
+			}
+			r.line = ''
+		}
+		if r.line == 'debug_repl' {
+			eprintln('repl: $r')
+			continue
+		}
+		if r.line == 'reset' {
+			r = new_repl()
+			continue
+		}
+		if r.line == 'list' {
+			source_code := r.current_source_code(true, true)
+			println('//////////////////////////////////////////////////////////////////////////////////////')
+			println(source_code)
+			println('//////////////////////////////////////////////////////////////////////////////////////')
+			continue
+		}
+		// Save the source only if the user is printing something,
+		// but don't add this print call to the `lines` array,
+		// so that it doesn't get called during the next print.
+		if r.line.starts_with('=') {
+			r.line = 'println(' + r.line[1..] + ')'
+		}
+		if r.line.starts_with('print') {
+			source_code := r.current_source_code(false, false) + '\n$r.line\n'
+			os.write_file(file, source_code) or { panic(err) }
+			s := repl_run_vfile(file) or { return }
+			print_output(s)
+		} else {
+			mut temp_line := r.line
+			mut temp_flag := false
+			func_call := r.function_call(r.line)
+			filter_line := r.line.replace(r.line.find_between("'", "'"), '').replace(r.line.find_between('"',
+				'"'), '')
+			possible_statement_patterns := [
+				'++',
+				'--',
+				'<<',
+				'//',
+				'/*',
+				'fn ',
+				'pub ',
+				'mut ',
+				'enum ',
+				'const ',
+				'struct ',
+				'interface ',
+				'import ',
+				'#include ',
+				'for ',
+				'or ',
+				'insert',
+				'delete',
+				'prepend',
+				'sort',
+				'clear',
+				'trim',
+			]
+			mut is_statement := false
+			if filter_line.count('=') % 2 == 1 {
+				is_statement = true
+			} else {
+				for pattern in possible_statement_patterns {
+					if filter_line.contains(pattern) {
+						is_statement = true
+						break
+					}
+				}
+			}
+			// NB: starting a line with 2 spaces escapes the println heuristic
+			if oline.starts_with('  ') {
+				is_statement = true
+			}
+			if !is_statement && !func_call && r.line != '' {
+				temp_line = 'println($r.line)'
+				temp_flag = true
+			}
+			mut temp_source_code := ''
+			if temp_line.starts_with('import ') {
+				mod := r.line.fields()[1]
+				if mod !in r.modules {
+					temp_source_code = '$temp_line\n' + r.current_source_code(false, true)
+				}
+			} else if temp_line.starts_with('#include ') {
+				temp_source_code = '$temp_line\n' + r.current_source_code(false, false)
+			} else {
+				for i, l in r.lines {
+					if (l.starts_with('for ') || l.starts_with('if ')) && l.contains('println') {
+						r.lines.delete(i)
+						break
+					}
+				}
+				temp_source_code = r.current_source_code(true, false) + '\n$temp_line\n'
+			}
+			os.write_file(temp_file, temp_source_code) or { panic(err) }
+			s := repl_run_vfile(temp_file) or { return }
+			if !func_call && s.exit_code == 0 && !temp_flag {
+				for r.temp_lines.len > 0 {
+					if !r.temp_lines[0].starts_with('print') {
+						r.lines << r.temp_lines[0]
+					}
+					r.temp_lines.delete(0)
+				}
+				if r.line.starts_with('import ') {
+					mod := r.line.fields()[1]
+					if mod !in r.modules {
+						r.modules << mod
+					}
+				} else if r.line.starts_with('#include ') {
+					r.includes << r.line
+				} else {
+					r.lines << r.line
+				}
+			} else {
+				for r.temp_lines.len > 0 {
+					r.temp_lines.delete(0)
+				}
+			}
+			print_output(s)
+		}
+	}
+}
+
+fn print_output(s os.Result) {
+	lines := s.output.trim_right('\n\r').split_into_lines()
+	for line in lines {
+		if line.contains('.vrepl_temp.v:') {
+			// Hide the temporary file name
+			sline := line.all_after('.vrepl_temp.v:')
+			idx := sline.index(' ') or {
+				println(sline)
+				return
+			}
+			println(sline[idx + 1..])
+		} else if line.contains('.vrepl.v:') {
+			// Ensure that .vrepl.v: is at the start, ignore the path
+			// This is needed to have stable .repl tests.
+			idx := line.index('.vrepl.v:') or { return }
+			println(line[idx..])
+		} else {
+			println(line)
+		}
+	}
+}
+
+fn main() {
+	// Support for the parameters replfolder and replprefix is needed
+	// so that the repl can be launched in parallel by several different
+	// threads by the REPL test runner.
+	args := cmdline.options_after(os.args, ['repl'])
+	replfolder := os.real_path(cmdline.option(args, '-replfolder', os.temp_dir()))
+	replprefix := cmdline.option(args, '-replprefix', 'noprefix.${rand.ulid()}.')
+	if !os.exists(os.getenv('VEXE')) {
+		println('Usage:')
+		println('  VEXE=vexepath vrepl\n')
+		println('  ... where vexepath is the full path to the v executable file')
+		return
+	}
+	run_repl(replfolder, replprefix)
+}
+
+fn rerror(s string) {
+	println('V repl error: $s')
+	os.flush()
+}
+
+fn (mut r Repl) get_one_line(prompt string) ?string {
+	if is_stdin_a_pipe {
+		iline := os.get_raw_line()
+		if iline.len == 0 {
+			return none
+		}
+		return iline
+	}
+	rline := r.readline.read_line(prompt) or { return none }
+	return rline
+}
+
+fn cleanup_files(files []string) {
+	for file in files {
+		os.rm(file) or {}
+		$if windows {
+			os.rm(file[..file.len - 2] + '.exe') or {}
+			$if msvc {
+				os.rm(file[..file.len - 2] + '.ilk') or {}
+				os.rm(file[..file.len - 2] + '.pdb') or {}
+			}
+		} $else {
+			os.rm(file[..file.len - 2]) or {}
+		}
+	}
+}
+
+fn repl_run_vfile(file string) ?os.Result {
+	$if trace_repl_temp_files ? {
+		eprintln('>> repl_run_vfile file: $file')
+	}
+	s := os.execute('"$vexe" -repl run "$file"')
+	if s.exit_code < 0 {
+		rerror(s.output)
+		return error(s.output)
+	}
+	return s
+}
diff --git a/v_windows/v/cmd/tools/vself.exe b/v_windows/v/cmd/tools/vself.exe
new file mode 100644
index 0000000..b073b1c
--- /dev/null
+++ b/v_windows/v/cmd/tools/vself.exe
diff --git a/v_windows/v/cmd/tools/vself.v b/v_windows/v/cmd/tools/vself.v
new file mode 100644
index 0000000..5c8d1d2
--- /dev/null
+++ b/v_windows/v/cmd/tools/vself.v
@@ -0,0 +1,88 @@
+module main
+
+import os
+import os.cmdline
+import v.pref
+import v.util.recompilation
+
+const is_debug = os.args.contains('-debug')
+
+fn main() {
+	vexe := pref.vexe_path()
+	vroot := os.dir(vexe)
+	recompilation.must_be_enabled(vroot, 'Please install V from source, to use `v self` .')
+	os.chdir(vroot) ?
+	os.setenv('VCOLORS', 'always', true)
+	args := os.args[1..].filter(it != 'self')
+	jargs := args.join(' ')
+	obinary := cmdline.option(args, '-o', '')
+	sargs := if obinary != '' { jargs } else { '$jargs -o v2' }
+	cmd := '$vexe $sargs cmd/v'
+	options := if args.len > 0 { '($sargs)' } else { '' }
+	println('V self compiling ${options}...')
+	compile(vroot, cmd)
+	if obinary != '' {
+		// When -o was given, there is no need to backup/rename the original.
+		// The user just wants an independent copy of v, and so we are done.
+		return
+	}
+	backup_old_version_and_rename_newer() or { panic(err.msg) }
+	println('V built successfully!')
+}
+
+fn compile(vroot string, cmd string) {
+	result := os.execute_or_exit(cmd)
+	if result.exit_code != 0 {
+		eprintln('cannot compile to `$vroot`: \n$result.output')
+		exit(1)
+	}
+	if result.output.len > 0 {
+		println(result.output.trim_space())
+	}
+}
+
+fn list_folder(bmessage string, message string) {
+	if !is_debug {
+		return
+	}
+	if bmessage != '' {
+		println(bmessage)
+	}
+	if os.user_os() == 'windows' {
+		os.system('dir v*.exe')
+	} else {
+		os.system('ls -lartd v*')
+	}
+	println(message)
+}
+
+fn backup_old_version_and_rename_newer() ?bool {
+	mut errors := []string{}
+	short_v_file := if os.user_os() == 'windows' { 'v.exe' } else { 'v' }
+	short_v2_file := if os.user_os() == 'windows' { 'v2.exe' } else { 'v2' }
+	short_bak_file := if os.user_os() == 'windows' { 'v_old.exe' } else { 'v_old' }
+	v_file := os.real_path(short_v_file)
+	v2_file := os.real_path(short_v2_file)
+	bak_file := os.real_path(short_bak_file)
+
+	list_folder('before:', 'removing $bak_file ...')
+	if os.exists(bak_file) {
+		os.rm(bak_file) or { errors << 'failed removing $bak_file: $err.msg' }
+	}
+
+	list_folder('', 'moving $v_file to $bak_file ...')
+	os.mv(v_file, bak_file) or { errors << err.msg }
+
+	list_folder('', 'removing $v_file ...')
+	os.rm(v_file) or {}
+
+	list_folder('', 'moving $v2_file to $v_file ...')
+	os.mv_by_cp(v2_file, v_file) or { panic(err.msg) }
+
+	list_folder('after:', '')
+
+	if errors.len > 0 {
+		eprintln('backup errors:\n  >>  ' + errors.join('\n  >>  '))
+	}
+	return true
+}
diff --git a/v_windows/v/cmd/tools/vsetup-freetype.v b/v_windows/v/cmd/tools/vsetup-freetype.v
new file mode 100644
index 0000000..16bbd2e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vsetup-freetype.v
@@ -0,0 +1,28 @@
+module main
+
+import os
+import v.pref
+
+const freetype_repo_url = 'https://github.com/ubawurinna/freetype-windows-binaries'
+
+const freetype_folder = os.join_path('thirdparty', 'freetype')
+
+fn main() {
+	$if windows {
+		println('Setup freetype...')
+		vroot := os.dir(pref.vexe_path())
+		os.chdir(vroot) ?
+		if os.is_dir(freetype_folder) {
+			println('Thirdparty "freetype" is already installed.')
+		} else {
+			s := os.execute('git clone --depth=1 $freetype_repo_url $freetype_folder')
+			if s.exit_code != 0 {
+				panic(s.output)
+			}
+			println(s.output)
+			println('Thirdparty "freetype" installed successfully.')
+		}
+	} $else {
+		println('It is only for Windows to setup thirdparty "freetype".')
+	}
+}
diff --git a/v_windows/v/cmd/tools/vsymlink.v b/v_windows/v/cmd/tools/vsymlink.v
new file mode 100644
index 0000000..c5d7d8a
--- /dev/null
+++ b/v_windows/v/cmd/tools/vsymlink.v
@@ -0,0 +1,182 @@
+import os
+import v.pref
+import v.util
+
+$if windows {
+	$if tinyc {
+		#flag -ladvapi32
+		#flag -luser32
+	}
+}
+fn main() {
+	C.atexit(cleanup_vtmp_folder)
+	vexe := os.real_path(pref.vexe_path())
+	$if windows {
+		setup_symlink_windows(vexe)
+	} $else {
+		setup_symlink_unix(vexe)
+	}
+}
+
+fn cleanup_vtmp_folder() {
+	os.rmdir_all(util.get_vtmp_folder()) or {}
+}
+
+fn setup_symlink_unix(vexe string) {
+	mut link_path := '/data/data/com.termux/files/usr/bin/v'
+	if !os.is_dir('/data/data/com.termux/files') {
+		link_dir := '/usr/local/bin'
+		if !os.exists(link_dir) {
+			os.mkdir_all(link_dir) or { panic(err) }
+		}
+		link_path = link_dir + '/v'
+	}
+	os.rm(link_path) or {}
+	os.symlink(vexe, link_path) or {
+		eprintln('Failed to create symlink "$link_path". Try again with sudo.')
+		exit(1)
+	}
+}
+
+fn setup_symlink_windows(vexe string) {
+	$if windows {
+		// Create a symlink in a new local folder (.\.bin\.v.exe)
+		// Puts `v` in %PATH% without polluting it with anything else (like make.bat).
+		// This will make `v` available on cmd.exe, PowerShell, and MinGW(MSYS)/WSL/Cygwin
+		vdir := os.real_path(os.dir(vexe))
+		vsymlinkdir := os.join_path(vdir, '.bin')
+		mut vsymlink := os.join_path(vsymlinkdir, 'v.exe')
+		// Remove old symlink first (v could have been moved, symlink rerun)
+		if !os.exists(vsymlinkdir) {
+			os.mkdir(vsymlinkdir) or { panic(err) }
+		} else {
+			if os.exists(vsymlink) {
+				os.rm(vsymlink) or { panic(err) }
+			} else {
+				vsymlink = os.join_path(vsymlinkdir, 'v.bat')
+				if os.exists(vsymlink) {
+					os.rm(vsymlink) or { panic(err) }
+				}
+				vsymlink = os.join_path(vsymlinkdir, 'v.exe')
+			}
+		}
+		// First, try to create a native symlink at .\.bin\v.exe
+		os.symlink(vsymlink, vexe) or {
+			// typically only fails if you're on a network drive (VirtualBox)
+			// do batch file creation instead
+			eprintln('Could not create a native symlink: $err')
+			eprintln('Creating a batch file instead...')
+			vsymlink = os.join_path(vsymlinkdir, 'v.bat')
+			if os.exists(vsymlink) {
+				os.rm(vsymlink) or { panic(err) }
+			}
+			os.write_file(vsymlink, '@echo off\n$vexe %*') or { panic(err) }
+			eprintln('$vsymlink file written.')
+		}
+		if !os.exists(vsymlink) {
+			warn_and_exit('Could not create $vsymlink')
+		}
+		println('Symlink $vsymlink to $vexe created.')
+		println('Checking system %PATH%...')
+		reg_sys_env_handle := get_reg_sys_env_handle() or {
+			warn_and_exit(err.msg)
+			return
+		}
+		// TODO: Fix defers inside ifs
+		// defer {
+		// C.RegCloseKey(reg_sys_env_handle)
+		// }
+		// if the above succeeded, and we cannot get the value, it may simply be empty
+		sys_env_path := get_reg_value(reg_sys_env_handle, 'Path') or { '' }
+		current_sys_paths := sys_env_path.split(os.path_delimiter).map(it.trim('/$os.path_separator'))
+		mut new_paths := [vsymlinkdir]
+		for p in current_sys_paths {
+			if p == '' {
+				continue
+			}
+			if p !in new_paths {
+				new_paths << p
+			}
+		}
+		new_sys_env_path := new_paths.join(';')
+		if new_sys_env_path == sys_env_path {
+			println('System %PATH% was already configured.')
+		} else {
+			println('System %PATH% was not configured.')
+			println('Adding symlink directory to system %PATH%...')
+			set_reg_value(reg_sys_env_handle, 'Path', new_sys_env_path) or {
+				C.RegCloseKey(reg_sys_env_handle)
+				warn_and_exit(err.msg)
+			}
+			println('Done.')
+		}
+		println('Notifying running processes to update their Environment...')
+		send_setting_change_msg('Environment') or {
+			eprintln(err)
+			C.RegCloseKey(reg_sys_env_handle)
+			warn_and_exit('You might need to run this again to have the `v` command in your %PATH%')
+		}
+		C.RegCloseKey(reg_sys_env_handle)
+		println('Done.')
+		println('Note: Restart your shell/IDE to load the new %PATH%.')
+		println('After restarting your shell/IDE, give `v version` a try in another directory!')
+	}
+}
+
+fn warn_and_exit(err string) {
+	eprintln(err)
+	exit(1)
+}
+
+// get the system environment registry handle
+fn get_reg_sys_env_handle() ?voidptr {
+	$if windows { // wrap for cross-compile compat
+		// open the registry key
+		reg_key_path := 'Environment'
+		reg_env_key := voidptr(0) // or HKEY (HANDLE)
+		if C.RegOpenKeyEx(os.hkey_current_user, reg_key_path.to_wide(), 0, 1 | 2, &reg_env_key) != 0 {
+			return error('Could not open "$reg_key_path" in the registry')
+		}
+		return reg_env_key
+	}
+	return error('not on windows')
+}
+
+// get a value from a given $key
+fn get_reg_value(reg_env_key voidptr, key string) ?string {
+	$if windows {
+		// query the value (shortcut the sizing step)
+		reg_value_size := u32(4095) // this is the max length (not for the registry, but for the system %PATH%)
+		mut reg_value := unsafe { &u16(malloc(int(reg_value_size))) }
+		if C.RegQueryValueExW(reg_env_key, key.to_wide(), 0, 0, reg_value, &reg_value_size) != 0 {
+			return error('Unable to get registry value for "$key".')
+		}
+		return unsafe { string_from_wide(reg_value) }
+	}
+	return error('not on windows')
+}
+
+// sets the value for the given $key to the given  $value
+fn set_reg_value(reg_key voidptr, key string, value string) ?bool {
+	$if windows {
+		if C.RegSetValueExW(reg_key, key.to_wide(), 0, C.REG_EXPAND_SZ, value.to_wide(),
+			value.len * 2) != 0 {
+			return error('Unable to set registry value for "$key". %PATH% may be too long.')
+		}
+		return true
+	}
+	return error('not on windows')
+}
+
+// Broadcasts a message to all listening windows (explorer.exe in particular)
+// letting them know that the system environment has changed and should be reloaded
+fn send_setting_change_msg(message_data string) ?bool {
+	$if windows {
+		if C.SendMessageTimeoutW(os.hwnd_broadcast, os.wm_settingchange, 0, unsafe { &u32(message_data.to_wide()) },
+			os.smto_abortifhung, 5000, 0) == 0 {
+			return error('Could not broadcast WM_SETTINGCHANGE')
+		}
+		return true
+	}
+	return error('not on windows')
+}
diff --git a/v_windows/v/cmd/tools/vtest-all.v b/v_windows/v/cmd/tools/vtest-all.v
new file mode 100644
index 0000000..6c32d73
--- /dev/null
+++ b/v_windows/v/cmd/tools/vtest-all.v
@@ -0,0 +1,192 @@
+module main
+
+import os
+import term
+import time
+
+const vexe = os.getenv('VEXE')
+
+const vroot = os.dir(vexe)
+
+const args_string = os.args[1..].join(' ')
+
+const vargs = args_string.all_before('test-all')
+
+const vtest_nocleanup = os.getenv('VTEST_NOCLEANUP').bool()
+
+fn main() {
+	mut commands := get_all_commands()
+	// summary
+	sw := time.new_stopwatch()
+	for mut cmd in commands {
+		cmd.run()
+	}
+	spent := sw.elapsed().milliseconds()
+	oks := commands.filter(it.ecode == 0)
+	fails := commands.filter(it.ecode != 0)
+	println('')
+	println(term.header_left(term_highlight('Summary of `v test-all`:'), '-'))
+	println(term_highlight('Total runtime: $spent ms'))
+	for ocmd in oks {
+		msg := if ocmd.okmsg != '' { ocmd.okmsg } else { ocmd.line }
+		println(term.colorize(term.green, '>          OK: $msg '))
+	}
+	for fcmd in fails {
+		msg := if fcmd.errmsg != '' { fcmd.errmsg } else { fcmd.line }
+		println(term.failed('>      Failed:') + ' $msg')
+	}
+	if fails.len > 0 {
+		exit(1)
+	}
+}
+
+struct Command {
+mut:
+	line   string
+	label  string // when set, the label will be printed *before* cmd.line is executed
+	ecode  int
+	okmsg  string
+	errmsg string
+	rmfile string
+}
+
+fn get_all_commands() []Command {
+	mut res := []Command{}
+	res << Command{
+		line: '$vexe examples/hello_world.v'
+		okmsg: 'V can compile hello world.'
+		rmfile: 'examples/hello_world'
+	}
+	res << Command{
+		line: '$vexe -o hhww.c examples/hello_world.v'
+		okmsg: 'V can output a .c file, without compiling further.'
+		rmfile: 'hhww.c'
+	}
+	$if linux || macos {
+		res << Command{
+			line: '$vexe -o - examples/hello_world.v | grep "#define V_COMMIT_HASH" > /dev/null'
+			okmsg: 'V prints the generated source code to stdout with `-o -` .'
+		}
+	}
+	res << Command{
+		line: '$vexe -o vtmp cmd/v'
+		okmsg: 'V can compile itself.'
+		rmfile: 'vtmp'
+	}
+	res << Command{
+		line: '$vexe -o vtmp_werror -cstrict cmd/v'
+		okmsg: 'V can compile itself with -cstrict.'
+		rmfile: 'vtmp_werror'
+	}
+	res << Command{
+		line: '$vexe -o vtmp_autofree -autofree cmd/v'
+		okmsg: 'V can compile itself with -autofree.'
+		rmfile: 'vtmp_autofree'
+	}
+	res << Command{
+		line: '$vexe -o vtmp_prealloc -prealloc cmd/v'
+		okmsg: 'V can compile itself with -prealloc.'
+		rmfile: 'vtmp_prealloc'
+	}
+	res << Command{
+		line: '$vexe -o vtmp_unused -skip-unused cmd/v'
+		okmsg: 'V can compile itself with -skip-unused.'
+		rmfile: 'vtmp_unused'
+	}
+	$if linux {
+		res << Command{
+			line: '$vexe -cc gcc -keepc -freestanding -o bel vlib/os/bare/bare_example_linux.v'
+			okmsg: 'V can compile with -freestanding on Linux with GCC.'
+			rmfile: 'bel'
+		}
+	}
+	res << Command{
+		line: '$vexe $vargs -progress test-cleancode'
+		okmsg: 'All .v files are invariant when processed with `v fmt`'
+	}
+	res << Command{
+		line: '$vexe $vargs -progress test-fmt'
+		okmsg: 'All .v files can be processed with `v fmt`. NB: the result may not always be compilable, but `v fmt` should not crash.'
+	}
+	res << Command{
+		line: '$vexe $vargs -progress test-self'
+		okmsg: 'There are no _test.v file regressions.'
+	}
+	res << Command{
+		line: '$vexe $vargs -progress -W build-tools'
+		okmsg: 'All tools can be compiled.'
+	}
+	res << Command{
+		line: '$vexe $vargs -progress -W build-examples'
+		okmsg: 'All examples can be compiled.'
+	}
+	res << Command{
+		line: '$vexe check-md -hide-warnings .'
+		label: 'Check ```v ``` code examples and formatting of .MD files...'
+		okmsg: 'All .md files look good.'
+	}
+	res << Command{
+		line: '$vexe install nedpals.args'
+		okmsg: '`v install` works.'
+	}
+	res << Command{
+		line: '$vexe -usecache -cg examples/hello_world.v'
+		okmsg: '`v -usecache -cg` works.'
+		rmfile: 'examples/hello_world'
+	}
+	// NB: test that a program that depends on thirdparty libraries with its
+	// own #flags (tetris depends on gg, which uses sokol) can be compiled
+	// with -usecache:
+	res << Command{
+		line: '$vexe -usecache examples/tetris/tetris.v'
+		okmsg: '`v -usecache` works.'
+		rmfile: 'examples/tetris/tetris'
+	}
+	$if macos || linux {
+		res << Command{
+			line: '$vexe -o v.c cmd/v && cc -Werror v.c && rm -rf a.out'
+			label: 'v.c should be buildable with no warnings...'
+			okmsg: 'v.c can be compiled without warnings. This is good :)'
+			rmfile: 'v.c'
+		}
+	}
+	return res
+}
+
+fn (mut cmd Command) run() {
+	// Changing the current directory is needed for some of the compiler tests,
+	// vlib/v/tests/local_test.v and vlib/v/tests/repl/repl_test.v
+	os.chdir(vroot) or {}
+	if cmd.label != '' {
+		println(term.header_left(cmd.label, '*'))
+	}
+	sw := time.new_stopwatch()
+	cmd.ecode = os.system(cmd.line)
+	spent := sw.elapsed().milliseconds()
+	println('> Running: "$cmd.line" took: $spent ms ... ' +
+		if cmd.ecode != 0 { term.failed('FAILED') } else { term_highlight('OK') })
+	if vtest_nocleanup {
+		return
+	}
+	if cmd.rmfile != '' {
+		mut file_existed := rm_existing(cmd.rmfile)
+		if os.user_os() == 'windows' {
+			file_existed = file_existed || rm_existing(cmd.rmfile + '.exe')
+		}
+		if !file_existed {
+			eprintln('Expected file did not exist: $cmd.rmfile')
+			cmd.ecode = 999
+		}
+	}
+}
+
+// try to remove a file, return if it existed before the removal attempt
+fn rm_existing(path string) bool {
+	existed := os.exists(path)
+	os.rm(path) or {}
+	return existed
+}
+
+fn term_highlight(s string) string {
+	return term.colorize(term.yellow, term.colorize(term.bold, s))
+}
diff --git a/v_windows/v/cmd/tools/vtest-cleancode.v b/v_windows/v/cmd/tools/vtest-cleancode.v
new file mode 100644
index 0000000..82c0784
--- /dev/null
+++ b/v_windows/v/cmd/tools/vtest-cleancode.v
@@ -0,0 +1,101 @@
+module main
+
+import os
+import testing
+import v.util
+import arrays
+
+const (
+	vet_known_failing_exceptions    = []string{}
+	vet_folders                     = [
+		'vlib/sqlite',
+		'vlib/v',
+		'vlib/x/json2',
+		'vlib/x/ttf',
+		'cmd/v',
+		'cmd/tools',
+		'examples/2048',
+		'examples/tetris',
+		'examples/term.ui',
+	]
+	verify_known_failing_exceptions = [
+		// Handcrafted meaningful formatting of code parts (mostly arrays)
+		'examples/sokol/02_cubes_glsl/cube_glsl.v',
+		'examples/sokol/03_march_tracing_glsl/rt_glsl.v',
+		'examples/sokol/04_multi_shader_glsl/rt_glsl.v',
+		'examples/sokol/05_instancing_glsl/rt_glsl.v',
+		'examples/sokol/06_obj_viewer/show_obj.v',
+		'vlib/gg/m4/graphic.v',
+		'vlib/gg/m4/m4_test.v',
+		'vlib/gg/m4/matrix.v',
+		'vlib/sqlite/orm.v' /* mut c &int -> mut c int */,
+		'vlib/builtin/int_test.v' /* special number formatting that should be tested */,
+		// TODOs and unfixed vfmt bugs
+		'vlib/builtin/int.v' /* TODO byteptr: vfmt converts `pub fn (nn byteptr) str() string {` to `nn &byte` and that conflicts with `nn byte` */,
+		'vlib/builtin/string_charptr_byteptr_helpers.v' /* TODO byteptr: a temporary shim to ease the byteptr=>&byte transition */,
+		'vlib/v/tests/interop_test.v', /* bad comment formatting */
+		'vlib/v/gen/js/tests/js.v', /* local `hello` fn, gets replaced with module `hello` aliased as `hl` */
+	]
+	vfmt_verify_list                = [
+		'cmd/',
+		'examples/',
+		'tutorials/',
+		'vlib/',
+	]
+	vfmt_known_failing_exceptions   = arrays.merge(verify_known_failing_exceptions, [
+		'vlib/regex/regex_test.v' /* contains meaningfull formatting of the test case data */,
+		'vlib/readline/readline_test.v' /* vfmt eats `{ Readline }` from `import readline { Readline }` */,
+		'vlib/glm/glm.v' /* `mut res &f32` => `mut res f32`, which then fails to compile */,
+		'vlib/crypto/sha512/sha512block_generic.v' /* formatting of large constant arrays wraps to too many lines */,
+		'vlib/crypto/aes/const.v' /* formatting of large constant arrays wraps to too many lines */,
+	])
+)
+
+const (
+	vexe   = os.getenv('VEXE')
+	vroot  = os.dir(vexe)
+	is_fix = '-fix' in os.args
+)
+
+fn main() {
+	args_string := os.args[1..].join(' ')
+	pass_args := args_string.all_before('test-cleancode')
+	v_test_vetting(pass_args)
+}
+
+fn tsession(vargs string, tool_source string, tool_cmd string, tool_args string, flist []string, slist []string) testing.TestSession {
+	os.chdir(vroot) or {}
+	title_message := 'running $tool_cmd over most .v files'
+	testing.eheader(title_message)
+	mut test_session := testing.new_test_session('$vargs $tool_args', false)
+	test_session.files << flist
+	test_session.skip_files << slist
+	util.prepare_tool_when_needed(tool_source)
+	// note that util.prepare_tool_when_needed will put its temporary files
+	// in the VTMP from the test session too, so they will be cleaned up
+	// at the end
+	test_session.test()
+	eprintln(test_session.benchmark.total_message(title_message))
+	return test_session
+}
+
+fn v_test_vetting(vargs string) {
+	expanded_vet_list := util.find_all_v_files(vet_folders) or { return }
+	vet_session := tsession(vargs, 'vvet', 'v vet', 'vet', expanded_vet_list, vet_known_failing_exceptions)
+	//
+	fmt_cmd, fmt_args := if is_fix { 'v fmt -w', 'fmt -w' } else { 'v fmt -verify', 'fmt -verify' }
+	vfmt_list := util.find_all_v_files(vfmt_verify_list) or { return }
+	exceptions := util.find_all_v_files(vfmt_known_failing_exceptions) or { return }
+	verify_session := tsession(vargs, 'vfmt.v', fmt_cmd, fmt_args, vfmt_list, exceptions)
+	//
+	if vet_session.benchmark.nfail > 0 || verify_session.benchmark.nfail > 0 {
+		eprintln('\n')
+		if vet_session.benchmark.nfail > 0 {
+			eprintln('WARNING: `v vet` failed $vet_session.benchmark.nfail times.')
+		}
+		if verify_session.benchmark.nfail > 0 {
+			eprintln('WARNING: `v fmt -verify` failed $verify_session.benchmark.nfail times.')
+		}
+		exit(1)
+	}
+}
diff --git a/v_windows/v/cmd/tools/vtest-fmt.v b/v_windows/v/cmd/tools/vtest-fmt.v
new file mode 100644
index 0000000..b1ebb81
--- /dev/null
+++ b/v_windows/v/cmd/tools/vtest-fmt.v
@@ -0,0 +1,43 @@
+module main
+
+import os
+import testing
+import v.util
+
+const (
+	known_failing_exceptions = [
+		'vlib/crypto/aes/const.v' /* const array wrapped in too many lines */,
+	]
+)
+
+fn main() {
+	args_string := os.args[1..].join(' ')
+	v_test_formatting(args_string.all_before('test-fmt'))
+}
+
+fn v_test_formatting(vargs string) {
+	all_v_files := v_files()
+	util.prepare_tool_when_needed('vfmt.v')
+	testing.eheader('Run "v fmt" over all .v files')
+	mut vfmt_test_session := testing.new_test_session('$vargs fmt -worker', false)
+	vfmt_test_session.files << all_v_files
+	vfmt_test_session.skip_files << known_failing_exceptions
+	vfmt_test_session.test()
+	eprintln(vfmt_test_session.benchmark.total_message('running vfmt over V files'))
+	if vfmt_test_session.benchmark.nfail > 0 {
+		eprintln('\nWARNING: v fmt failed $vfmt_test_session.benchmark.nfail times.\n')
+		exit(1)
+	}
+}
+
+fn v_files() []string {
+	mut files_that_can_be_formatted := []string{}
+	all_test_files := os.walk_ext('.', '.v')
+	for tfile in all_test_files {
+		if tfile.starts_with('./vlib/v/cgen/tests') {
+			continue
+		}
+		files_that_can_be_formatted << tfile
+	}
+	return files_that_can_be_formatted
+}
diff --git a/v_windows/v/cmd/tools/vtest-parser.v b/v_windows/v/cmd/tools/vtest-parser.v
new file mode 100644
index 0000000..2743d2d
--- /dev/null
+++ b/v_windows/v/cmd/tools/vtest-parser.v
@@ -0,0 +1,289 @@
+import os
+import flag
+import term
+import time
+import v.parser
+import v.ast
+import v.pref
+
+const (
+	vexe          = pref.vexe_path()
+	vroot         = os.dir(vexe)
+	support_color = term.can_show_color_on_stderr() && term.can_show_color_on_stdout()
+	ecode_timeout = 101
+	ecode_memout  = 102
+	ecode_details = {
+		-1:  'worker executable not found'
+		101: 'too slow'
+		102: 'too memory hungry'
+	}
+)
+
+struct Context {
+mut:
+	is_help    bool
+	is_worker  bool
+	is_verbose bool
+	is_silent  bool // do not print any status/progress during processing, just failures.
+	is_linear  bool // print linear progress log, without trying to do term cursor up + \r msg. Easier to use in a CI job
+	timeout_ms int
+	myself     string   // path to this executable, so the supervisor can launch worker processes
+	all_paths  []string // all files given to the supervisor process
+	path       string   // the current path, given to a worker process
+	cut_index  int      // the cut position in the source from context.path
+	max_index  int      // the maximum index (equivalent to the file content length)
+	// parser context in the worker processes:
+	table      ast.Table
+	scope      ast.Scope
+	pref       &pref.Preferences
+	period_ms  int  // print periodic progress
+	stop_print bool // stop printing the periodic progress
+}
+
+fn main() {
+	mut context := process_cli_args()
+	if context.is_worker {
+		pid := os.getpid()
+		context.log('> worker ${pid:5} starts parsing at cut_index: ${context.cut_index:5} | $context.path')
+		// A worker's process job is to try to parse a single given file in context.path.
+		// It can crash/panic freely.
+		context.table = ast.new_table()
+		context.scope = &ast.Scope{
+			parent: 0
+		}
+		context.pref = &pref.Preferences{
+			output_mode: .silent
+		}
+		mut source := os.read_file(context.path) ?
+		source = source[..context.cut_index]
+
+		go fn (ms int) {
+			time.sleep(ms * time.millisecond)
+			exit(ecode_timeout)
+		}(context.timeout_ms)
+		_ := parser.parse_text(source, context.path, context.table, .skip_comments, context.pref)
+		context.log('> worker ${pid:5} finished parsing $context.path')
+		exit(0)
+	} else {
+		// The process supervisor should NOT crash/panic, unlike the workers.
+		// It's job, is to:
+		// 1) start workers
+		// 2) accumulate results
+		// 3) produce a summary at the end
+		context.expand_all_paths()
+		mut fails := 0
+		mut panics := 0
+		sw := time.new_stopwatch()
+		for path in context.all_paths {
+			filesw := time.new_stopwatch()
+			context.start_printing()
+			new_fails, new_panics := context.process_whole_file_in_worker(path)
+			fails += new_fails
+			panics += new_panics
+			context.stop_printing()
+			context.info('File: ${path:-30} | new_fails: ${new_fails:5} | new_panics: ${new_panics:5} | Elapsed time: ${filesw.elapsed().milliseconds()}ms')
+		}
+		non_panics := fails - panics
+		context.info('Total files processed: ${context.all_paths.len:5} | Errors found: ${fails:5} | Panics: ${panics:5} | Non panics: ${non_panics:5} | Elapsed time: ${sw.elapsed().milliseconds()}ms')
+		if fails > 0 {
+			exit(1)
+		}
+		exit(0)
+	}
+}
+
+fn process_cli_args() &Context {
+	mut context := &Context{
+		pref: pref.new_preferences()
+	}
+	context.myself = os.executable()
+	mut fp := flag.new_flag_parser(os.args_after('test-parser'))
+	fp.application(os.file_name(context.myself))
+	fp.version('0.0.1')
+	fp.description('Test the V parser, by parsing each .v file in each PATH,\n' +
+		'as if it was typed character by character by the user.\n' +
+		'A PATH can be either a folder, or a specific .v file.\n' +
+		'NB: you *have to quote* the PATH, if it contains spaces/punctuation.')
+	fp.arguments_description('PATH1 PATH2 ...')
+	fp.skip_executable()
+	context.is_help = fp.bool('help', `h`, false, 'Show help/usage screen.')
+	context.is_verbose = fp.bool('verbose', `v`, false, 'Be more verbose.')
+	context.is_silent = fp.bool('silent', `S`, false, 'Do not print progress at all.')
+	context.is_linear = fp.bool('linear', `L`, false, 'Print linear progress log. Suitable for CI.')
+	context.period_ms = fp.int('progress_ms', `s`, 500, 'print a status report periodically, the period is given in milliseconds.')
+	context.is_worker = fp.bool('worker', `w`, false, 'worker specific flag - is this a worker process, that can crash/panic.')
+	context.cut_index = fp.int('cut_index', `c`, 1, 'worker specific flag - cut index in the source file, everything before that will be parsed, the rest - ignored.')
+	context.timeout_ms = fp.int('timeout_ms', `t`, 250, 'worker specific flag - timeout in ms; a worker taking longer, will self terminate.')
+	context.path = fp.string('path', `p`, '', 'worker specific flag - path to the current source file, which will be parsed.')
+	//
+	if context.is_help {
+		println(fp.usage())
+		exit(0)
+	}
+	context.all_paths = fp.finalize() or {
+		context.error(err.msg)
+		exit(1)
+	}
+	if !context.is_worker && context.all_paths.len == 0 {
+		println(fp.usage())
+		exit(0)
+	}
+	return context
+}
+
+// ////////////////
+fn bold(msg string) string {
+	if !support_color {
+		return msg
+	}
+	return term.bold(msg)
+}
+
+fn red(msg string) string {
+	if !support_color {
+		return msg
+	}
+	return term.red(msg)
+}
+
+fn yellow(msg string) string {
+	if !support_color {
+		return msg
+	}
+	return term.yellow(msg)
+}
+
+fn (mut context Context) info(msg string) {
+	println(msg)
+}
+
+fn (mut context Context) log(msg string) {
+	if context.is_verbose {
+		label := yellow('info')
+		ts := time.now().format_ss_micro()
+		eprintln('$label: $ts | $msg')
+	}
+}
+
+fn (mut context Context) error(msg string) {
+	label := red('error')
+	eprintln('$label: $msg')
+}
+
+fn (mut context Context) expand_all_paths() {
+	context.log('> context.all_paths before: $context.all_paths')
+	mut files := []string{}
+	for path in context.all_paths {
+		if os.is_dir(path) {
+			files << os.walk_ext(path, '.v')
+			files << os.walk_ext(path, '.vsh')
+			continue
+		}
+		if !path.ends_with('.v') && !path.ends_with('.vv') && !path.ends_with('.vsh') {
+			context.error('`v test-parser` can only be used on .v/.vv/.vsh files.\nOffending file: "$path".')
+			continue
+		}
+		if !os.exists(path) {
+			context.error('"$path" does not exist.')
+			continue
+		}
+		files << path
+	}
+	context.all_paths = files
+	context.log('> context.all_paths after: $context.all_paths')
+}
+
+fn (mut context Context) process_whole_file_in_worker(path string) (int, int) {
+	context.path = path // needed for the progress bar
+	context.log('> context.process_whole_file_in_worker path: $path')
+	if !(os.is_file(path) && os.is_readable(path)) {
+		context.error('$path is not readable')
+		return 1, 0
+	}
+	source := os.read_file(path) or { '' }
+	if source == '' {
+		// an empty file is a valid .v file
+		return 0, 0
+	}
+	len := source.len - 1
+	mut fails := 0
+	mut panics := 0
+	context.max_index = len
+	for i in 0 .. len {
+		verbosity := if context.is_verbose { '-v' } else { '' }
+		context.cut_index = i // needed for the progress bar
+		cmd := '"$context.myself" $verbosity --worker --timeout_ms ${context.timeout_ms:5} --cut_index ${i:5} --path "$path" '
+		context.log(cmd)
+		mut res := os.execute(cmd)
+		context.log('worker exit_code: $res.exit_code | worker output:\n$res.output')
+		if res.exit_code != 0 {
+			fails++
+			mut is_panic := false
+			if res.output.contains('V panic:') {
+				is_panic = true
+				panics++
+			}
+			part := source[..i]
+			line := part.count('\n') + 1
+			last_line := part.all_after_last('\n')
+			col := last_line.len
+			err := if is_panic {
+				red('parser failure: panic')
+			} else {
+				red('parser failure: crash, ${ecode_details[res.exit_code]}')
+			}
+			path_to_line := bold('$path:$line:$col:')
+			err_line := last_line.trim_left('\t')
+			println('$path_to_line $err')
+			println('\t$line | $err_line')
+			println('')
+			eprintln(res.output)
+		}
+	}
+	return fails, panics
+}
+
+fn (mut context Context) start_printing() {
+	context.stop_print = false
+	if !context.is_linear && !context.is_silent {
+		println('\n')
+	}
+	go context.print_periodic_status()
+}
+
+fn (mut context Context) stop_printing() {
+	context.stop_print = true
+	time.sleep(time.millisecond * context.period_ms / 5)
+}
+
+fn (mut context Context) print_status() {
+	if context.is_silent {
+		return
+	}
+	if (context.cut_index == 1) && (context.max_index == 0) {
+		return
+	}
+	msg := '>   ${context.path:-30} | index: ${context.cut_index:5}/${context.max_index - 1:5}'
+	if context.is_linear {
+		eprintln(msg)
+		return
+	}
+	term.cursor_up(1)
+	eprint('\r  $msg\n')
+}
+
+fn (mut context Context) print_periodic_status() {
+	context.print_status()
+	mut printed_at_least_once := false
+	for !context.stop_print {
+		context.print_status()
+		for i := 0; i < 10 && !context.stop_print; i++ {
+			time.sleep(time.millisecond * context.period_ms / 10)
+			if context.cut_index > 50 && !printed_at_least_once {
+				context.print_status()
+				printed_at_least_once = true
+			}
+		}
+	}
+	context.print_status()
+}
diff --git a/v_windows/v/cmd/tools/vtest-self.v b/v_windows/v/cmd/tools/vtest-self.v
new file mode 100644
index 0000000..d632d1f
--- /dev/null
+++ b/v_windows/v/cmd/tools/vtest-self.v
@@ -0,0 +1,238 @@
+module main
+
+import os
+import testing
+import v.pref
+
+const github_job = os.getenv('GITHUB_JOB')
+
+const (
+	skip_test_files               = [
+		'vlib/context/deadline_test.v' /* sometimes blocks */,
+		'vlib/mysql/mysql_orm_test.v' /* mysql not installed */,
+		'vlib/pg/pg_orm_test.v' /* pg not installed */,
+	]
+	skip_fsanitize_too_slow       = [
+		// These tests are too slow to be run in the CI on each PR/commit
+		// in the sanitized modes:
+		'vlib/v/compiler_errors_test.v',
+		'vlib/v/doc/doc_test.v',
+		'vlib/v/fmt/fmt_test.v',
+		'vlib/v/fmt/fmt_keep_test.v',
+		'vlib/v/fmt/fmt_vlib_test.v',
+		'vlib/v/live/live_test.v',
+		'vlib/v/parser/v_parser_test.v',
+		'vlib/v/scanner/scanner_test.v',
+		'vlib/v/tests/inout/compiler_test.v',
+		'vlib/v/tests/prod_test.v',
+		'vlib/v/tests/profile/profile_test.v',
+		'vlib/v/tests/repl/repl_test.v',
+		'vlib/v/tests/valgrind/valgrind_test.v',
+	]
+	skip_with_fsanitize_memory    = [
+		'vlib/net/tcp_simple_client_server_test.v',
+		'vlib/net/http/cookie_test.v',
+		'vlib/net/http/http_test.v',
+		'vlib/net/http/status_test.v',
+		'vlib/net/http/http_httpbin_test.v',
+		'vlib/net/http/header_test.v',
+		'vlib/net/http/server_test.v',
+		'vlib/net/udp_test.v',
+		'vlib/net/tcp_test.v',
+		'vlib/orm/orm_test.v',
+		'vlib/sqlite/sqlite_test.v',
+		'vlib/sqlite/sqlite_orm_test.v',
+		'vlib/v/tests/orm_sub_struct_test.v',
+		'vlib/v/tests/orm_sub_array_struct_test.v',
+		'vlib/vweb/tests/vweb_test.v',
+		'vlib/vweb/request_test.v',
+		'vlib/net/http/request_test.v',
+		'vlib/net/http/response_test.v',
+		'vlib/vweb/route_test.v',
+		'vlib/net/websocket/websocket_test.v',
+		'vlib/crypto/rand/crypto_rand_read_test.v',
+	]
+	skip_with_fsanitize_address   = [
+		'vlib/net/websocket/websocket_test.v',
+	]
+	skip_with_fsanitize_undefined = [
+		'do_not_remove',
+	]
+	skip_with_werror              = [
+		'do_not_remove',
+	]
+	skip_with_asan_compiler       = [
+		'do_not_remove',
+	]
+	skip_with_msan_compiler       = [
+		'do_not_remove',
+	]
+	skip_on_musl                  = [
+		'vlib/v/tests/profile/profile_test.v',
+	]
+	skip_on_ubuntu_musl           = [
+		//'vlib/v/gen/js/jsgen_test.v',
+		'vlib/net/http/cookie_test.v',
+		'vlib/net/http/http_test.v',
+		'vlib/net/http/status_test.v',
+		'vlib/net/websocket/ws_test.v',
+		'vlib/sqlite/sqlite_test.v',
+		'vlib/sqlite/sqlite_orm_test.v',
+		'vlib/orm/orm_test.v',
+		'vlib/v/tests/orm_sub_struct_test.v',
+		'vlib/v/tests/orm_sub_array_struct_test.v',
+		'vlib/clipboard/clipboard_test.v',
+		'vlib/vweb/tests/vweb_test.v',
+		'vlib/vweb/request_test.v',
+		'vlib/net/http/request_test.v',
+		'vlib/vweb/route_test.v',
+		'vlib/net/websocket/websocket_test.v',
+		'vlib/net/http/http_httpbin_test.v',
+		'vlib/net/http/header_test.v',
+		'vlib/net/http/server_test.v',
+		'vlib/net/http/response_test.v',
+	]
+	skip_on_linux                 = [
+		'do_not_remove',
+	]
+	skip_on_non_linux             = [
+		'do_not_remove',
+	]
+	skip_on_windows               = [
+		'vlib/orm/orm_test.v',
+		'vlib/v/tests/orm_sub_struct_test.v',
+		'vlib/v/tests/closure_test.v',
+		'vlib/net/websocket/ws_test.v',
+		'vlib/net/unix/unix_test.v',
+		'vlib/net/websocket/websocket_test.v',
+		'vlib/vweb/tests/vweb_test.v',
+		'vlib/vweb/request_test.v',
+		'vlib/net/http/request_test.v',
+		'vlib/vweb/route_test.v',
+	]
+	skip_on_non_windows           = [
+		'do_not_remove',
+	]
+	skip_on_macos                 = [
+		'do_not_remove',
+	]
+	skip_on_non_macos             = [
+		'do_not_remove',
+	]
+	skip_on_amd64                 = [
+		'do_not_remove',
+	]
+	skip_on_non_amd64             = [
+		'vlib/v/tests/closure_test.v' /* not implemented yet */,
+		'do_not_remove',
+	]
+)
+
+// NB: musl misses openssl, thus the http tests can not be done there
+// NB: http_httpbin_test.v: fails with 'cgen error: json: map_string_string is not struct'
+fn main() {
+	vexe := pref.vexe_path()
+	vroot := os.dir(vexe)
+	os.chdir(vroot) or { panic(err) }
+	args := os.args.clone()
+	args_string := args[1..].join(' ')
+	cmd_prefix := args_string.all_before('test-self')
+	title := 'testing vlib'
+	all_test_files := os.walk_ext(os.join_path(vroot, 'vlib'), '_test.v')
+	testing.eheader(title)
+	mut tsession := testing.new_test_session(cmd_prefix, true)
+	tsession.files << all_test_files.filter(!it.contains('testdata' + os.path_separator))
+	tsession.skip_files << skip_test_files
+
+	if github_job == 'windows-tcc' {
+		// TODO: fix these ASAP
+		tsession.skip_files << 'vlib/net/tcp_test.v'
+		tsession.skip_files << 'vlib/net/udp_test.v'
+	}
+
+	mut werror := false
+	mut sanitize_memory := false
+	mut sanitize_address := false
+	mut sanitize_undefined := false
+	mut asan_compiler := false
+	mut msan_compiler := false
+	for arg in args {
+		if arg.contains('-asan-compiler') {
+			asan_compiler = true
+		}
+		if arg.contains('-msan-compiler') {
+			msan_compiler = true
+		}
+		if arg.contains('-Werror') || arg.contains('-cstrict') {
+			werror = true
+		}
+		if arg.contains('-fsanitize=memory') {
+			sanitize_memory = true
+		}
+		if arg.contains('-fsanitize=address') {
+			sanitize_address = true
+		}
+		if arg.contains('-fsanitize=undefined') {
+			sanitize_undefined = true
+		}
+	}
+	if os.getenv('VTEST_RUN_FSANITIZE_TOO_SLOW').len == 0
+		&& (sanitize_undefined || sanitize_memory || sanitize_address) {
+		tsession.skip_files << skip_fsanitize_too_slow
+	}
+	if werror {
+		tsession.skip_files << skip_with_werror
+	}
+	if sanitize_memory {
+		tsession.skip_files << skip_with_fsanitize_memory
+	}
+	if sanitize_address {
+		tsession.skip_files << skip_with_fsanitize_address
+	}
+	if sanitize_undefined {
+		tsession.skip_files << skip_with_fsanitize_undefined
+	}
+	if asan_compiler {
+		tsession.skip_files << skip_with_asan_compiler
+	}
+	if msan_compiler {
+		tsession.skip_files << skip_with_msan_compiler
+	}
+	// println(tsession.skip_files)
+	if os.getenv('V_CI_MUSL').len > 0 {
+		tsession.skip_files << skip_on_musl
+	}
+	if os.getenv('V_CI_UBUNTU_MUSL').len > 0 {
+		tsession.skip_files << skip_on_ubuntu_musl
+	}
+	$if !amd64 {
+		tsession.skip_files << skip_on_non_amd64
+	}
+	$if amd64 {
+		tsession.skip_files << skip_on_amd64
+	}
+	$if !linux {
+		tsession.skip_files << skip_on_non_linux
+	}
+	$if linux {
+		tsession.skip_files << skip_on_linux
+	}
+	$if windows {
+		tsession.skip_files << skip_on_windows
+	}
+	$if !windows {
+		tsession.skip_files << skip_on_non_windows
+	}
+	$if macos {
+		tsession.skip_files << skip_on_macos
+	}
+	$if !macos {
+		tsession.skip_files << skip_on_non_macos
+	}
+	tsession.test()
+	eprintln(tsession.benchmark.total_message(title))
+	if tsession.benchmark.nfail > 0 {
+		eprintln('\nWARNING: failed $tsession.benchmark.nfail times.\n')
+		exit(1)
+	}
+}
diff --git a/v_windows/v/cmd/tools/vtest.v b/v_windows/v/cmd/tools/vtest.v
new file mode 100644
index 0000000..d116d29
--- /dev/null
+++ b/v_windows/v/cmd/tools/vtest.v
@@ -0,0 +1,135 @@
+module main
+
+import os
+import os.cmdline
+import testing
+import v.pref
+
+fn main() {
+	args := os.args.clone()
+	if os.args.last() == 'test' {
+		show_usage()
+		return
+	}
+	args_to_executable := args[1..]
+	args_before := cmdline.options_before(args_to_executable, ['test'])
+	args_after := cmdline.options_after(args_to_executable, ['test'])
+	if args_after.join(' ') == 'v' {
+		eprintln('`v test v` has been deprecated.')
+		eprintln('Use `v test-all` instead.')
+		exit(1)
+	}
+	backend_pos := args_before.index('-b')
+	backend := if backend_pos == -1 { '.c' } else { args_before[backend_pos + 1] } // this giant mess because closures are not implemented
+
+	mut ts := testing.new_test_session(args_before.join(' '), true)
+	for targ in args_after {
+		if os.is_dir(targ) {
+			// Fetch all tests from the directory
+			files, skip_files := should_test_dir(targ.trim_right(os.path_separator), backend)
+			ts.files << files
+			ts.skip_files << skip_files
+			continue
+		} else if os.exists(targ) {
+			match should_test(targ, backend) {
+				.test {
+					ts.files << targ
+					continue
+				}
+				.skip {
+					ts.files << targ
+					ts.skip_files << targ
+					continue
+				}
+				.ignore {}
+			}
+		} else {
+			eprintln('\nUnrecognized test file `$targ`.\n `v test` can only be used with folders and/or _test.v files.\n')
+			show_usage()
+			exit(1)
+		}
+	}
+	testing.header('Testing...')
+	ts.test()
+	println(ts.benchmark.total_message('all V _test.v files'))
+	if ts.failed {
+		exit(1)
+	}
+}
+
+fn show_usage() {
+	println('Usage:')
+	println('   A)')
+	println('      v test folder/ : run all v tests in the given folder.')
+	println('      v -stats test folder/ : the same, but print more stats.')
+	println('   B)')
+	println('      v test file_test.v : run test functions in a given test file.')
+	println('      v -stats test file_test.v : as above, but with more stats.')
+	println('   NB: you can also give many and mixed folder/ file_test.v arguments after `v test` .')
+	println('')
+}
+
+pub fn should_test_dir(path string, backend string) ([]string, []string) { // return is (files, skip_files)
+	mut files := os.ls(path) or { return []string{}, []string{} }
+	mut local_path_separator := os.path_separator
+	if path.ends_with(os.path_separator) {
+		local_path_separator = ''
+	}
+	mut res_files := []string{}
+	mut skip_files := []string{}
+	for file in files {
+		p := path + local_path_separator + file
+		if os.is_dir(p) && !os.is_link(p) {
+			if file == 'testdata' {
+				continue
+			}
+			ret_files, ret_skip_files := should_test_dir(p, backend)
+			res_files << ret_files
+			skip_files << ret_skip_files
+		} else if os.exists(p) {
+			match should_test(p, backend) {
+				.test {
+					res_files << p
+				}
+				.skip {
+					res_files << p
+					skip_files << p
+				}
+				.ignore {}
+			}
+		}
+	}
+	return res_files, skip_files
+}
+
+enum ShouldTestStatus {
+	test // do test
+	skip
+	ignore
+}
+
+fn should_test(path string, backend string) ShouldTestStatus {
+	if path.ends_with('_test.v') {
+		return .test
+	}
+	if path.ends_with('.v') && path.count('.') == 2 {
+		if !path.all_before_last('.v').all_before_last('.').ends_with('_test') {
+			return .ignore
+		}
+		backend_arg := path.all_before_last('.v').all_after_last('.')
+		arch := pref.arch_from_string(backend_arg) or { pref.Arch._auto }
+		if arch == pref.get_host_arch() {
+			return .test
+		} else if arch == ._auto {
+			if backend_arg == 'c' { // .c.v
+				return if backend == 'c' { ShouldTestStatus.test } else { ShouldTestStatus.skip }
+			}
+			if backend_arg == 'js' {
+				return if backend == 'js' { ShouldTestStatus.test } else { ShouldTestStatus.skip }
+			}
+		} else {
+			return .skip
+		}
+	}
+	return .ignore
+}
diff --git a/v_windows/v/cmd/tools/vtracev.v b/v_windows/v/cmd/tools/vtracev.v
new file mode 100644
index 0000000..801704b
--- /dev/null
+++ b/v_windows/v/cmd/tools/vtracev.v
@@ -0,0 +1,17 @@
+module main
+
+import os
+import v.pref
+
+fn main() {
+	vexe := pref.vexe_path()
+	vroot := os.dir(vexe)
+	os.chdir(vroot) ?
+	os.setenv('VCOLORS', 'always', true)
+	self_idx := os.args.index('tracev')
+	args := os.args[1..self_idx]
+	args_str := args.join(' ')
+	options := if args.len > 0 { '($args_str)' } else { '' }
+	println('Compiling a `tracev` executable ${options}...')
+	os.system('$vexe -cg -d trace_parser -d trace_checker -d trace_gen -o tracev $args_str cmd/v')
+}
diff --git a/v_windows/v/cmd/tools/vup.exe b/v_windows/v/cmd/tools/vup.exe
new file mode 100644
index 0000000..14884bb
--- /dev/null
+++ b/v_windows/v/cmd/tools/vup.exe
diff --git a/v_windows/v/cmd/tools/vup.v b/v_windows/v/cmd/tools/vup.v
new file mode 100644
index 0000000..8c7e960
--- /dev/null
+++ b/v_windows/v/cmd/tools/vup.v
@@ -0,0 +1,164 @@
+module main
+
+import os
+import v.pref
+import v.util.version
+import v.util.recompilation
+
+struct App {
+	is_verbose bool
+	is_prod    bool
+	vexe       string
+	vroot      string
+}
+
+fn new_app() App {
+	vexe := os.real_path(pref.vexe_path())
+	vroot := os.dir(vexe)
+	return App{
+		is_verbose: '-v' in os.args
+		is_prod: '-prod' in os.args
+		vexe: vexe
+		vroot: vroot
+	}
+}
+
+fn main() {
+	app := new_app()
+	recompilation.must_be_enabled(app.vroot, 'Please install V from source, to use `v up` .')
+	os.chdir(app.vroot) ?
+	println('Updating V...')
+	app.update_from_master()
+	v_hash := version.githash(false)
+	current_hash := version.githash(true)
+	// println(v_hash)
+	// println(current_hash)
+	if v_hash == current_hash {
+		app.show_current_v_version()
+		return
+	}
+	$if windows {
+		app.backup('cmd/tools/vup.exe')
+	}
+	app.recompile_v()
+	app.recompile_vup()
+	app.show_current_v_version()
+}
+
+fn (app App) vprintln(s string) {
+	if app.is_verbose {
+		println(s)
+	}
+}
+
+fn (app App) update_from_master() {
+	app.vprintln('> updating from master ...')
+	if !os.exists('.git') {
+		// initialize as if it had been cloned
+		app.git_command('init')
+		app.git_command('remote add origin https://github.com/vlang/v')
+		app.git_command('fetch')
+		app.git_command('reset --hard origin/master')
+		app.git_command('clean --quiet -xdf --exclude v.exe --exclude cmd/tools/vup.exe')
+	} else {
+		// pull latest
+		app.git_command('pull https://github.com/vlang/v master')
+	}
+}
+
+fn (app App) recompile_v() {
+	// NB: app.vexe is more reliable than just v (which may be a symlink)
+	opts := if app.is_prod { '-prod' } else { '' }
+	vself := '"$app.vexe" $opts self'
+	app.vprintln('> recompiling v itself with `$vself` ...')
+	self_result := os.execute(vself)
+	if self_result.exit_code == 0 {
+		println(self_result.output.trim_space())
+		return
+	} else {
+		app.vprintln('`$vself` failed, running `make`...')
+		app.vprintln(self_result.output.trim_space())
+	}
+	app.make(vself)
+}
+
+fn (app App) recompile_vup() {
+	vup_result := os.execute('"$app.vexe" -g cmd/tools/vup.v')
+	if vup_result.exit_code != 0 {
+		eprintln('recompiling vup.v failed:')
+		eprintln(vup_result.output)
+	}
+}
+
+fn (app App) make(vself string) {
+	mut make := 'make'
+	$if windows {
+		make = 'make.bat'
+	}
+	make_result := os.execute(make)
+	if make_result.exit_code != 0 {
+		eprintln('> $make failed:')
+		eprintln('> make output:')
+		eprintln(make_result.output)
+		return
+	}
+	app.vprintln(make_result.output)
+}
+
+fn (app App) show_current_v_version() {
+	vout := os.execute('"$app.vexe" version')
+	if vout.exit_code >= 0 {
+		mut vversion := vout.output.trim_space()
+		if vout.exit_code == 0 {
+			latest_v_commit := vversion.split(' ').last().all_after('.')
+			latest_v_commit_time := os.execute('git show -s --format=%ci $latest_v_commit')
+			if latest_v_commit_time.exit_code == 0 {
+				vversion += ', timestamp: ' + latest_v_commit_time.output.trim_space()
+			}
+		}
+		println('Current V version:')
+		println(vversion)
+	}
+}
+
+fn (app App) backup(file string) {
+	backup_file := '${file}_old.exe'
+	if os.exists(backup_file) {
+		os.rm(backup_file) or { eprintln('failed removing $backup_file: $err.msg') }
+	}
+	os.mv(file, backup_file) or { eprintln('failed moving $file: $err.msg') }
+}
+
+fn (app App) git_command(command string) {
+	app.vprintln('git_command: git $command')
+	git_result := os.execute('git $command')
+	if git_result.exit_code < 0 {
+		app.get_git()
+		// Try it again with (maybe) git installed
+		os.execute_or_exit('git $command')
+	}
+	if git_result.exit_code != 0 {
+		eprintln(git_result.output)
+		exit(1)
+	}
+	app.vprintln(git_result.output)
+}
+
+fn (app App) get_git() {
+	$if windows {
+		println('Downloading git 32 bit for Windows, please wait.')
+		// We'll use 32 bit because maybe someone out there is using 32-bit windows
+		res_download := os.execute('bitsadmin.exe /transfer "vgit" https://github.com/git-for-windows/git/releases/download/v2.30.0.windows.2/Git-2.30.0.2-32-bit.exe "$os.getwd()/git32.exe"')
+		if res_download.exit_code != 0 {
+			eprintln('Unable to install git automatically: please install git manually')
+			panic(res_download.output)
+		}
+		res_git32 := os.execute('$os.getwd()/git32.exe')
+		if res_git32.exit_code != 0 {
+			eprintln('Unable to install git automatically: please install git manually')
+			panic(res_git32.output)
+		}
+	} $else { // Probably some kind of *nix, usually need to get using a package manager.
+		eprintln("error: Install `git` using your system's package manager")
+	}
+}
diff --git a/v_windows/v/cmd/tools/vvet/tests/array_init_one_val.out b/v_windows/v/cmd/tools/vvet/tests/array_init_one_val.out
new file mode 100644
index 0000000..e10d511
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/array_init_one_val.out
@@ -0,0 +1,2 @@
+cmd/tools/vvet/tests/array_init_one_val.vv:2: error: Use `var == value` instead of `var in [value]`
+NB: You can run `v fmt -w file.v` to fix these errors automatically
diff --git a/v_windows/v/cmd/tools/vvet/tests/array_init_one_val.vv b/v_windows/v/cmd/tools/vvet/tests/array_init_one_val.vv
new file mode 100644
index 0000000..2aa3514
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/array_init_one_val.vv
@@ -0,0 +1,5 @@
+fn main() {
+	if 1 in [1] {
+		println('hello world')
+	}
+}
diff --git a/v_windows/v/cmd/tools/vvet/tests/indent_with_space.out b/v_windows/v/cmd/tools/vvet/tests/indent_with_space.out
new file mode 100644
index 0000000..b307e20
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/indent_with_space.out
@@ -0,0 +1,6 @@
+cmd/tools/vvet/tests/indent_with_space.vv:2: error: Looks like you are using spaces for indentation.
+cmd/tools/vvet/tests/indent_with_space.vv:10: error: Looks like you are using spaces for indentation.
+cmd/tools/vvet/tests/indent_with_space.vv:17: error: Looks like you are using spaces for indentation.
+cmd/tools/vvet/tests/indent_with_space.vv:20: error: Looks like you are using spaces for indentation.
+cmd/tools/vvet/tests/indent_with_space.vv:22: error: Looks like you are using spaces for indentation.
+NB: You can run `v fmt -w file.v` to fix these errors automatically
diff --git a/v_windows/v/cmd/tools/vvet/tests/indent_with_space.vv b/v_windows/v/cmd/tools/vvet/tests/indent_with_space.vv
new file mode 100644
index 0000000..9b466ef
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/indent_with_space.vv
@@ -0,0 +1,24 @@
+fn main() {
+    _ = 1 == 2
+}
+
+fn block_comments() {
+	/* tab to indent the comment
+  spaces before
+  also spaces before
+  same here */
+  /* spaces for comment indentation (ouch)
+  and inside too
+  */
+}
+
+fn space_inside_strings() {
+	// Plain strings
+  str := "Bad space usage for variable indentation.
+  Here it's fine.
+  Here too."
+  str2 := 'linebreak and space\n  inside'
+	// String interpolation
+  si1 := 'Error here $foo
+  and not here'
+}
diff --git a/v_windows/v/cmd/tools/vvet/tests/module_file_test.out b/v_windows/v/cmd/tools/vvet/tests/module_file_test.out
new file mode 100644
index 0000000..b033e71
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/module_file_test.out
@@ -0,0 +1,5 @@
+cmd/tools/vvet/tests/module_file_test.vv:7: warning: Function documentation seems to be missing for "pub fn foo() string".
+cmd/tools/vvet/tests/module_file_test.vv:13: warning: A function name is missing from the documentation of "pub fn bar() string".
+cmd/tools/vvet/tests/module_file_test.vv:35: warning: Function documentation seems to be missing for "pub fn (f Foo) foo() string".
+cmd/tools/vvet/tests/module_file_test.vv:46: warning: A function name is missing from the documentation of "pub fn (f Foo) fooo() string".
+cmd/tools/vvet/tests/module_file_test.vv:52: warning: The documentation for "pub fn (f Foo) boo() string" seems incomplete.
\ No newline at end of file
diff --git a/v_windows/v/cmd/tools/vvet/tests/module_file_test.vv b/v_windows/v/cmd/tools/vvet/tests/module_file_test.vv
new file mode 100644
index 0000000..f0f5b24
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/module_file_test.vv
@@ -0,0 +1,55 @@
+module foo
+
+struct Foo {
+	foo int
+}
+
+pub fn foo() string {
+	// Missing doc
+	return 'foo'
+}
+
+// foo does bar
+pub fn bar() string {
+	// not using convention style: '// <fn name>'
+	return 'bar'
+}
+
+// fooo does x
+pub fn fooo() string {
+	// Documented
+	return 'fooo'
+}
+
+// booo does x
+fn booo() string {
+	// Documented, but not pub
+	return 'booo'
+}
+
+fn boo() string {
+	// Missing doc
+	return 'boo'
+}
+
+pub fn (f Foo) foo() string {
+	// Missing doc
+	return f.fo()
+}
+
+fn (f Foo) fo() string {
+	// Missing doc, but not pub
+	return 'foo'
+}
+
+// wrong doc
+pub fn (f Foo) fooo() string {
+	// not using convention
+	return f.fo()
+}
+
+// boo
+pub fn (f Foo) boo() string {
+	// Incomplete doc
+	return f.fo()
+}
diff --git a/v_windows/v/cmd/tools/vvet/tests/parens_space_a.out b/v_windows/v/cmd/tools/vvet/tests/parens_space_a.out
new file mode 100644
index 0000000..dbda99a
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/parens_space_a.out
@@ -0,0 +1,2 @@
+cmd/tools/vvet/tests/parens_space_a.vv:1: error: Looks like you are adding a space after `(`
+NB: You can run `v fmt -w file.v` to fix these errors automatically
diff --git a/v_windows/v/cmd/tools/vvet/tests/parens_space_a.vv b/v_windows/v/cmd/tools/vvet/tests/parens_space_a.vv
new file mode 100644
index 0000000..2b3b508
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/parens_space_a.vv
@@ -0,0 +1,4 @@
+fn main() {
+	_ = 1 + ( 1 + 2)
+}
+
diff --git a/v_windows/v/cmd/tools/vvet/tests/parens_space_b.out b/v_windows/v/cmd/tools/vvet/tests/parens_space_b.out
new file mode 100644
index 0000000..d1d8791
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/parens_space_b.out
@@ -0,0 +1,2 @@
+cmd/tools/vvet/tests/parens_space_b.vv:1: error: Looks like you are adding a space before `)`
+NB: You can run `v fmt -w file.v` to fix these errors automatically
diff --git a/v_windows/v/cmd/tools/vvet/tests/parens_space_b.vv b/v_windows/v/cmd/tools/vvet/tests/parens_space_b.vv
new file mode 100644
index 0000000..9ea8932
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/parens_space_b.vv
@@ -0,0 +1,4 @@
+fn main() {
+	_ = 1 + (1 + 2 )
+}
+
diff --git a/v_windows/v/cmd/tools/vvet/tests/trailing_space.out b/v_windows/v/cmd/tools/vvet/tests/trailing_space.out
new file mode 100644
index 0000000..1899a21
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/trailing_space.out
@@ -0,0 +1,7 @@
+cmd/tools/vvet/tests/trailing_space.vv:5: error: Looks like you have trailing whitespace.
+cmd/tools/vvet/tests/trailing_space.vv:6: error: Looks like you have trailing whitespace.
+cmd/tools/vvet/tests/trailing_space.vv:7: error: Looks like you have trailing whitespace.
+cmd/tools/vvet/tests/trailing_space.vv:8: error: Looks like you have trailing whitespace.
+cmd/tools/vvet/tests/trailing_space.vv:9: error: Looks like you have trailing whitespace.
+cmd/tools/vvet/tests/trailing_space.vv:13: error: Looks like you have trailing whitespace.
+cmd/tools/vvet/tests/trailing_space.vv:15: error: Looks like you have trailing whitespace.
diff --git a/v_windows/v/cmd/tools/vvet/tests/trailing_space.vv b/v_windows/v/cmd/tools/vvet/tests/trailing_space.vv
new file mode 100644
index 0000000..4fe733e
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/tests/trailing_space.vv
@@ -0,0 +1,16 @@
+// NB: This file has and *should* have trailing spaces.
+// When making changes, please ensure they are not removed.
+
+fn after_comments() {
+	// spaces after line comments give errors  
+	/*  
+	in block comments  
+	too  
+	*/  
+}
+
+fn main() {
+	var := 'error about the spaces right there'  
+	no_err := "inside multi line strings it's fine.  
+but not after"  
+}
diff --git a/v_windows/v/cmd/tools/vvet/vet_test.v b/v_windows/v/cmd/tools/vvet/vet_test.v
new file mode 100644
index 0000000..f2c8523
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/vet_test.v
@@ -0,0 +1,72 @@
+import os
+import rand
+import term
+import v.util.vtest
+import v.util.diff
+
+const diff_cmd = find_diff_cmd()
+
+fn find_diff_cmd() string {
+	res := diff.find_working_diff_command() or { '' }
+	return res
+}
+
+fn test_vet() ? {
+	vexe := os.getenv('VEXE')
+	vroot := os.dir(vexe)
+	os.chdir(vroot) ?
+	test_dir := 'cmd/tools/vvet/tests'
+	tests := get_tests_in_dir(test_dir)
+	fails := check_path(vexe, test_dir, tests)
+	assert fails == 0
+}
+
+fn get_tests_in_dir(dir string) []string {
+	files := os.ls(dir) or { panic(err) }
+	mut tests := files.filter(it.ends_with('.vv'))
+	tests.sort()
+	return tests
+}
+
+fn check_path(vexe string, dir string, tests []string) int {
+	mut nb_fail := 0
+	paths := vtest.filter_vtest_only(tests, basepath: dir)
+	for path in paths {
+		program := path
+		print(path + ' ')
+		// -force is needed so that `v vet` would not skip the regression files
+		res := os.execute('$vexe vet -force -nocolor $program')
+		if res.exit_code < 0 {
+			panic(res.output)
+		}
+		mut expected := os.read_file(program.replace('.vv', '') + '.out') or { panic(err) }
+		expected = clean_line_endings(expected)
+		found := clean_line_endings(res.output)
+		if expected != found {
+			println(term.red('FAIL'))
+			println('============')
+			println('expected:')
+			println(expected)
+			println('============')
+			println('found:')
+			println(found)
+			println('============\n')
+			println('diff:')
+			println(diff.color_compare_strings(diff_cmd, rand.ulid(), found, expected))
+			println('============\n')
+			nb_fail++
+		} else {
+			println(term.green('OK'))
+		}
+	}
+	return nb_fail
+}
+
+fn clean_line_endings(s string) string {
+	mut res := s.trim_space()
+	res = res.replace(' \n', '\n')
+	res = res.replace(' \r\n', '\n')
+	res = res.replace('\r\n', '\n')
+	res = res.trim('\n')
+	return res
+}
diff --git a/v_windows/v/cmd/tools/vvet/vvet.v b/v_windows/v/cmd/tools/vvet/vvet.v
new file mode 100644
index 0000000..fd04b40
--- /dev/null
+++ b/v_windows/v/cmd/tools/vvet/vvet.v
@@ -0,0 +1,256 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
+module main
+
+import os
+import os.cmdline
+import v.vet
+import v.pref
+import v.parser
+import v.token
+import v.ast
+import term
+
+struct Vet {
+	opt Options
+mut:
+	errors []vet.Error
+	warns  []vet.Error
+	file   string
+}
+
+struct Options {
+	is_force      bool
+	is_werror     bool
+	is_verbose    bool
+	show_warnings bool
+	use_color     bool
+}
+
+const term_colors = term.can_show_color_on_stderr()
+
+fn main() {
+	vet_options := cmdline.options_after(os.args, ['vet'])
+	mut vt := Vet{
+		opt: Options{
+			is_force: '-force' in vet_options
+			is_werror: '-W' in vet_options
+			is_verbose: '-verbose' in vet_options || '-v' in vet_options
+			show_warnings: '-hide-warnings' !in vet_options && '-w' !in vet_options
+			use_color: '-color' in vet_options || (term_colors && '-nocolor' !in vet_options)
+		}
+	}
+	mut paths := cmdline.only_non_options(vet_options)
+	vtmp := os.getenv('VTMP')
+	if vtmp != '' {
+		// `v test-cleancode` passes also `-o tmpfolder` as well as all options in VFLAGS
+		paths = paths.filter(!it.starts_with(vtmp))
+	}
+	for path in paths {
+		if !os.exists(path) {
+			eprintln('File/folder $path does not exist')
+			continue
+		}
+		if os.is_file(path) {
+			vt.vet_file(path)
+		}
+		if os.is_dir(path) {
+			vt.vprintln("vetting folder: '$path' ...")
+			vfiles := os.walk_ext(path, '.v')
+			vvfiles := os.walk_ext(path, '.vv')
+			mut files := []string{}
+			files << vfiles
+			files << vvfiles
+			for file in files {
+				vt.vet_file(file)
+			}
+		}
+	}
+	vfmt_err_count := vt.errors.filter(it.fix == .vfmt).len
+	if vt.opt.show_warnings {
+		for w in vt.warns {
+			eprintln(vt.e2string(w))
+		}
+	}
+	for err in vt.errors {
+		eprintln(vt.e2string(err))
+	}
+	if vfmt_err_count > 0 {
+		eprintln('NB: You can run `v fmt -w file.v` to fix these errors automatically')
+	}
+	if vt.errors.len > 0 {
+		exit(1)
+	}
+}
+
+// vet_file vets the file read from `path`.
+fn (mut vt Vet) vet_file(path string) {
+	if path.contains('/tests/') && !vt.opt.is_force {
+		// skip all /tests/ files, since usually their content is not
+		// important enough to be documented/vetted, and they may even
+		// contain intentionally invalid code.
+		vt.vprintln("skipping test file: '$path' ...")
+		return
+	}
+	vt.file = path
+	mut prefs := pref.new_preferences()
+	prefs.is_vet = true
+	prefs.is_vsh = path.ends_with('.vsh')
+	table := ast.new_table()
+	vt.vprintln("vetting file '$path'...")
+	_, errors := parser.parse_vet_file(path, table, prefs)
+	// Transfer errors from scanner and parser
+	vt.errors << errors
+	// Scan each line in file for things to improve
+	source_lines := os.read_lines(vt.file) or { []string{} }
+	for lnumber, line in source_lines {
+		vt.vet_line(source_lines, line, lnumber)
+	}
+}
+
+// vet_line vets the contents of `line` from `vet.file`.
+fn (mut vt Vet) vet_line(lines []string, line string, lnumber int) {
+	// Vet public functions
+	if line.starts_with('pub fn') || (line.starts_with('fn ') && !(line.starts_with('fn C.')
+		|| line.starts_with('fn main'))) {
+		// Scan function declarations for missing documentation
+		is_pub_fn := line.starts_with('pub fn')
+		if lnumber > 0 {
+			collect_tags := fn (line string) []string {
+				mut cleaned := line.all_before('/')
+				cleaned = cleaned.replace_each(['[', '', ']', '', ' ', ''])
+				return cleaned.split(',')
+			}
+			ident_fn_name := fn (line string) string {
+				mut fn_idx := line.index(' fn ') or { return '' }
+				if line.len < fn_idx + 5 {
+					return ''
+				}
+				mut tokens := line[fn_idx + 4..].split(' ')
+				// Skip struct identifier
+				if tokens.first().starts_with('(') {
+					fn_idx = line.index(')') or { return '' }
+					tokens = line[fn_idx..].split(' ')
+					if tokens.len > 1 {
+						tokens = [tokens[1]]
+					}
+				}
+				if tokens.len > 0 {
+					return tokens[0].all_before('(')
+				}
+				return ''
+			}
+			mut line_above := lines[lnumber - 1]
+			mut tags := []string{}
+			if !line_above.starts_with('//') {
+				mut grab := true
+				for j := lnumber - 1; j >= 0; j-- {
+					prev_line := lines[j]
+					if prev_line.contains('}') { // We've looked back to the above scope, stop here
+						break
+					} else if prev_line.starts_with('[') {
+						tags << collect_tags(prev_line)
+						continue
+					} else if prev_line.starts_with('//') { // Single-line comment
+						grab = false
+						break
+					}
+				}
+				if grab {
+					clean_line := line.all_before_last('{').trim(' ')
+					if is_pub_fn {
+						vt.warn('Function documentation seems to be missing for "$clean_line".',
+							lnumber, .doc)
+					}
+				}
+			} else {
+				fn_name := ident_fn_name(line)
+				mut grab := true
+				for j := lnumber - 1; j >= 0; j-- {
+					prev_line := lines[j]
+					if prev_line.contains('}') { // We've looked back to the above scope, stop here
+						break
+					} else if prev_line.starts_with('// $fn_name ') {
+						grab = false
+						break
+					} else if prev_line.starts_with('// $fn_name') {
+						grab = false
+						if is_pub_fn {
+							clean_line := line.all_before_last('{').trim(' ')
+							vt.warn('The documentation for "$clean_line" seems incomplete.',
+								lnumber, .doc)
+						}
+						break
+					} else if prev_line.starts_with('[') {
+						tags << collect_tags(prev_line)
+						continue
+					} else if prev_line.starts_with('//') { // Single-line comment
+						continue
+					}
+				}
+				if grab {
+					clean_line := line.all_before_last('{').trim(' ')
+					if is_pub_fn {
+						vt.warn('A function name is missing from the documentation of "$clean_line".',
+							lnumber, .doc)
+					}
+				}
+			}
+		}
+	}
+}
+
+fn (vt &Vet) vprintln(s string) {
+	if !vt.opt.is_verbose {
+		return
+	}
+	println(s)
+}
+
+fn (vt &Vet) e2string(err vet.Error) string {
+	mut kind := '$err.kind:'
+	mut location := '$err.file_path:$err.pos.line_nr:'
+	if vt.opt.use_color {
+		kind = match err.kind {
+			.warning { term.magenta(kind) }
+			.error { term.red(kind) }
+		}
+		kind = term.bold(kind)
+		location = term.bold(location)
+	}
+	return '$location $kind $err.message'
+}
+
+fn (mut vt Vet) error(msg string, line int, fix vet.FixKind) {
+	pos := token.Position{
+		line_nr: line + 1
+	}
+	vt.errors << vet.Error{
+		message: msg
+		file_path: vt.file
+		pos: pos
+		kind: .error
+		fix: fix
+		typ: .default
+	}
+}
+
+fn (mut vt Vet) warn(msg string, line int, fix vet.FixKind) {
+	pos := token.Position{
+		line_nr: line + 1
+	}
+	mut w := vet.Error{
+		message: msg
+		file_path: vt.file
+		pos: pos
+		kind: .warning
+		fix: fix
+		typ: .default
+	}
+	if vt.opt.is_werror {
+		w.kind = .error
+		vt.errors << w
+	} else {
+		vt.warns << w
+	}
+}
diff --git a/v_windows/v/cmd/tools/vwatch.v b/v_windows/v/cmd/tools/vwatch.v
new file mode 100644
index 0000000..0ac243d
--- /dev/null
+++ b/v_windows/v/cmd/tools/vwatch.v
@@ -0,0 +1,381 @@
+module main
+
+import os
+import time
+import term
+import flag
+
+const scan_timeout_s = get_scan_timeout_seconds()
+
+const max_v_cycles = 1000
+
+const scan_frequency_hz = 4
+
+const scan_period_ms = 1000 / scan_frequency_hz
+
+const max_scan_cycles = scan_timeout_s * scan_frequency_hz
+
+fn get_scan_timeout_seconds() int {
+	env_vw_timeout := os.getenv('VWATCH_TIMEOUT').int()
+	if env_vw_timeout == 0 {
+		$if gcboehm ? {
+			return 35000000 // over 1 year
+		} $else {
+			return 5 * 60
+		}
+	}
+	return env_vw_timeout
+}
+
+//
+// Implements `v watch file.v` , `v watch run file.v` etc.
+// With this command, V will collect all .v files that are needed for the
+// compilation, then it will enter an infinite loop, monitoring them for
+// changes.
+//
+// When a change is detected, it will stop the current process, if it is
+// still running, then rerun/recompile/etc.
+//
+// In effect, this makes it easy to have an editor session and a separate
+// terminal, running just `v watch run file.v`, and you will see your
+// changes right after you save your .v file in your editor.
+//
+//
+//    Since -gc boehm is not available on all platforms yet,
+// and this program leaks ~8MB/minute without it, the implementation here
+// is done similarly to vfmt in 2 modes, in the same executable:
+//
+//   a) A parent/manager process that only manages a single worker
+//   process. The parent process does mostly nothing except restarting
+//   workers, thus it does not leak much.
+//
+//   b) A worker process, doing the actual monitoring/polling.
+//    NB: *workers are started with the --vwatchworker option*
+//
+//    Worker processes will run for a limited number of iterations, then
+// they will do exit(255), and then the parent will start a new worker.
+// Exiting by any other code will cause the parent to also exit with the
+// same error code. This limits the potential leak that a worker process
+// can do, even without using the garbage collection mode.
+//
+
+struct VFileStat {
+	path  string
+	mtime int
+}
+
+[unsafe]
+fn (mut vfs VFileStat) free() {
+	unsafe { vfs.path.free() }
+}
+
+enum RerunCommand {
+	restart
+	quit
+}
+
+struct Context {
+mut:
+	pid             int  // the pid of the current process; useful while debugging manager/worker interactions
+	is_worker       bool // true in the workers, false in the manager process
+	check_period_ms int = scan_period_ms
+	vexe            string
+	affected_paths  []string
+	vfiles          []VFileStat
+	opts            []string
+	rerun_channel   chan RerunCommand
+	child_process   &os.Process
+	is_exiting      bool     // set by SIGINT/Ctrl-C
+	v_cycles        int      // how many times the worker has restarted the V compiler
+	scan_cycles     int      // how many times the worker has scanned for source file changes
+	clear_terminal  bool     // whether to clear the terminal before each re-run
+	silent          bool     // when true, watch will not print a timestamp line before each re-run
+	add_files       []string // path to additional files that have to be watched for changes
+	ignore_exts     []string // extensions of files that will be ignored, even if they change (useful for sqlite.db files for example)
+	cmd_before_run  string   // a command to run before each re-run
+	cmd_after_run   string   // a command to run after each re-run
+}
+
+[if debug_vwatch ?]
+fn (mut context Context) elog(msg string) {
+	eprintln('> vwatch $context.pid, $msg')
+}
+
+fn (context &Context) str() string {
+	return 'Context{ pid: $context.pid, is_worker: $context.is_worker, check_period_ms: $context.check_period_ms, vexe: $context.vexe, opts: $context.opts, is_exiting: $context.is_exiting, vfiles: $context.vfiles'
+}
+
+fn (mut context Context) get_stats_for_affected_vfiles() []VFileStat {
+	if context.affected_paths.len == 0 {
+		mut apaths := map[string]bool{}
+		// The next command will make V parse the program, and print all .v files,
+		// needed for its compilation, without actually compiling it.
+		copts := context.opts.join(' ')
+		cmd := '"$context.vexe" -silent -print-v-files $copts'
+		// context.elog('> cmd: $cmd')
+		mut paths := []string{}
+		if context.add_files.len > 0 && context.add_files[0] != '' {
+			paths << context.add_files
+		}
+		vfiles := os.execute(cmd)
+		if vfiles.exit_code == 0 {
+			paths_trimmed := vfiles.output.trim_space()
+			paths << paths_trimmed.split('\n')
+		}
+		for vf in paths {
+			apaths[os.real_path(os.dir(vf))] = true
+		}
+		context.affected_paths = apaths.keys()
+		// context.elog('vfiles paths to be scanned: $context.affected_paths')
+	}
+	// scan all files in the found folders
+	mut newstats := []VFileStat{}
+	for path in context.affected_paths {
+		mut files := os.ls(path) or { []string{} }
+		for pf in files {
+			pf_ext := os.file_ext(pf).to_lower()
+			if pf_ext in ['', '.bak', '.exe', '.dll', '.so', '.def'] {
+				continue
+			}
+			if pf_ext in context.ignore_exts {
+				continue
+			}
+			if pf.starts_with('.#') {
+				continue
+			}
+			if pf.ends_with('~') {
+				continue
+			}
+			f := os.join_path(path, pf)
+			fullpath := os.real_path(f)
+			mtime := os.file_last_mod_unix(fullpath)
+			newstats << VFileStat{fullpath, mtime}
+		}
+	}
+	// always add the v compiler itself, so that if it is recompiled with `v self`
+	// the watcher will rerun the compilation too
+	newstats << VFileStat{context.vexe, os.file_last_mod_unix(context.vexe)}
+	return newstats
+}
+
+fn (mut context Context) get_changed_vfiles() int {
+	mut changed := 0
+	newfiles := context.get_stats_for_affected_vfiles()
+	for vfs in newfiles {
+		mut found := false
+		for existing_vfs in context.vfiles {
+			if existing_vfs.path == vfs.path {
+				found = true
+				if existing_vfs.mtime != vfs.mtime {
+					context.elog('> new updates for file: $vfs')
+					changed++
+				}
+				break
+			}
+		}
+		if !found {
+			changed++
+			continue
+		}
+	}
+	context.vfiles = newfiles
+	if changed > 0 {
+		context.elog('> get_changed_vfiles: $changed')
+	}
+	return changed
+}
+
+fn change_detection_loop(ocontext &Context) {
+	mut context := unsafe { ocontext }
+	for {
+		if context.v_cycles >= max_v_cycles || context.scan_cycles >= max_scan_cycles {
+			context.is_exiting = true
+			context.kill_pgroup()
+			time.sleep(50 * time.millisecond)
+			exit(255)
+		}
+		if context.is_exiting {
+			return
+		}
+		changes := context.get_changed_vfiles()
+		if changes > 0 {
+			context.rerun_channel <- RerunCommand.restart
+		}
+		time.sleep(context.check_period_ms * time.millisecond)
+		context.scan_cycles++
+	}
+}
+
+fn (mut context Context) kill_pgroup() {
+	if context.child_process == 0 {
+		return
+	}
+	if context.child_process.is_alive() {
+		context.child_process.signal_pgkill()
+	}
+	context.child_process.wait()
+}
+
+fn (mut context Context) run_before_cmd() {
+	if context.cmd_before_run != '' {
+		context.elog('> run_before_cmd: "$context.cmd_before_run"')
+		os.system(context.cmd_before_run)
+	}
+}
+
+fn (mut context Context) run_after_cmd() {
+	if context.cmd_after_run != '' {
+		context.elog('> run_after_cmd: "$context.cmd_after_run"')
+		os.system(context.cmd_after_run)
+	}
+}
+
+fn (mut context Context) compilation_runner_loop() {
+	cmd := '"$context.vexe" ${context.opts.join(' ')}'
+	_ := <-context.rerun_channel
+	for {
+		context.elog('>> loop: v_cycles: $context.v_cycles')
+		if context.clear_terminal {
+			term.clear()
+		}
+		context.run_before_cmd()
+		timestamp := time.now().format_ss_milli()
+		context.child_process = os.new_process(context.vexe)
+		context.child_process.use_pgroup = true
+		context.child_process.set_args(context.opts)
+		context.child_process.run()
+		if !context.silent {
+			eprintln('$timestamp: $cmd | pid: ${context.child_process.pid:7d} | reload cycle: ${context.v_cycles:5d}')
+		}
+		for {
+			mut notalive_count := 0
+			mut cmds := []RerunCommand{}
+			for {
+				if context.is_exiting {
+					return
+				}
+				if !context.child_process.is_alive() {
+					context.child_process.wait()
+					notalive_count++
+					if notalive_count == 1 {
+						// a short lived process finished, do cleanup:
+						context.run_after_cmd()
+					}
+				}
+				select {
+					action := <-context.rerun_channel {
+						cmds << action
+						if action == .quit {
+							context.kill_pgroup()
+							return
+						}
+					}
+					100 * time.millisecond {
+						should_restart := RerunCommand.restart in cmds
+						cmds = []
+						if should_restart {
+							// context.elog('>>>>>>>> KILLING $context.child_process.pid')
+							context.kill_pgroup()
+							break
+						}
+					}
+				}
+			}
+			if !context.child_process.is_alive() {
+				context.child_process.wait()
+				context.child_process.close()
+				if notalive_count == 0 {
+					// a long running process was killed, do cleanup:
+					context.run_after_cmd()
+				}
+				break
+			}
+		}
+		context.v_cycles++
+	}
+}
+
+const ccontext = Context{
+	child_process: 0
+}
+
+fn main() {
+	dump(scan_timeout_s)
+	mut context := unsafe { &Context(voidptr(&ccontext)) }
+	context.pid = os.getpid()
+	context.vexe = os.getenv('VEXE')
+
+	mut fp := flag.new_flag_parser(os.args[1..])
+	fp.application('v watch')
+	if os.args[1] == 'watch' {
+		fp.skip_executable()
+	}
+	fp.version('0.0.2')
+	fp.description('Collect all .v files needed for a compilation, then re-run the compilation when any of the source changes.')
+	fp.arguments_description('[--silent] [--clear] [--ignore .db] [--add /path/to/a/file.v] [run] program.v')
+	fp.allow_unknown_args()
+	fp.limit_free_args_to_at_least(1)
+	context.is_worker = fp.bool('vwatchworker', 0, false, 'Internal flag. Used to distinguish vwatch manager and worker processes.')
+	context.silent = fp.bool('silent', `s`, false, 'Be more silent; do not print the watch timestamp before each re-run.')
+	context.clear_terminal = fp.bool('clear', `c`, false, 'Clears the terminal before each re-run.')
+	context.add_files = fp.string('add', `a`, '', 'Add more files to be watched. Useful with `v watch -add=/tmp/feature.v run cmd/v /tmp/feature.v`, if you change *both* the compiler, and the feature.v file.').split(',')
+	context.ignore_exts = fp.string('ignore', `i`, '', 'Ignore files having these extensions. Useful with `v watch -ignore=.db run server.v`, if your server writes to an sqlite.db file in the same folder.').split(',')
+	show_help := fp.bool('help', `h`, false, 'Show this help screen.')
+	context.cmd_before_run = fp.string('before', 0, '', 'A command to execute *before* each re-run.')
+	context.cmd_after_run = fp.string('after', 0, '', 'A command to execute *after* each re-run.')
+	if show_help {
+		println(fp.usage())
+		exit(0)
+	}
+	remaining_options := fp.finalize() or {
+		eprintln('Error: $err')
+		exit(1)
+	}
+	context.opts = remaining_options
+	context.elog('>>> context.pid: $context.pid')
+	context.elog('>>> context.vexe: $context.vexe')
+	context.elog('>>> context.opts: $context.opts')
+	context.elog('>>> context.is_worker: $context.is_worker')
+	context.elog('>>> context.clear_terminal: $context.clear_terminal')
+	context.elog('>>> context.add_files: $context.add_files')
+	context.elog('>>> context.ignore_exts: $context.ignore_exts')
+	if context.is_worker {
+		context.worker_main()
+	} else {
+		context.manager_main()
+	}
+}
+
+fn (mut context Context) manager_main() {
+	myexecutable := os.executable()
+	mut worker_opts := ['--vwatchworker']
+	worker_opts << os.args[2..]
+	for {
+		mut worker_process := os.new_process(myexecutable)
+		worker_process.set_args(worker_opts)
+		worker_process.run()
+		for {
+			if !worker_process.is_alive() {
+				worker_process.wait()
+				break
+			}
+			time.sleep(200 * time.millisecond)
+		}
+		if !(worker_process.code == 255 && worker_process.status == .exited) {
+			worker_process.close()
+			break
+		}
+		worker_process.close()
+	}
+}
+
+fn (mut context Context) worker_main() {
+	context.rerun_channel = chan RerunCommand{cap: 10}
+	os.signal_opt(.int, fn (_ os.Signal) {
+		mut context := unsafe { &Context(voidptr(&ccontext)) }
+		context.is_exiting = true
+		context.kill_pgroup()
+	}) or { panic(err) }
+	go context.compilation_runner_loop()
+	change_detection_loop(context)
+}
diff --git a/v_windows/v/cmd/tools/vwipe-cache.v b/v_windows/v/cmd/tools/vwipe-cache.v
new file mode 100644
index 0000000..988b7c2
--- /dev/null
+++ b/v_windows/v/cmd/tools/vwipe-cache.v
@@ -0,0 +1,13 @@
+module main
+
+import os
+import v.vcache
+
+fn main() {
+	mut cm := vcache.new_cache_manager([])
+	cpath := cm.basepath
+	if os.exists(cpath) && os.is_dir(cpath) {
+		os.rmdir_all(cpath) or {}
+	}
+	println('V cache folder $cpath was wiped.')
+}
diff --git a/v_windows/v/cmd/v/help/ast.txt b/v_windows/v/cmd/v/help/ast.txt
new file mode 100644
index 0000000..4ce4637
--- /dev/null
+++ b/v_windows/v/cmd/v/help/ast.txt
@@ -0,0 +1,12 @@
+Usage:
+  v ast [options] path_to_source.v
+
+  Generate AST json file from v source file.
+
+Options:
+  -w
+    generate ast json file, and watch for changes.
+  -c
+    generate ast json file and c file, and watch for changes.
+  -p
+    print the json string to stdout.
\ No newline at end of file
diff --git a/v_windows/v/cmd/v/help/bin2v.txt b/v_windows/v/cmd/v/help/bin2v.txt
new file mode 100644
index 0000000..bb55c66
--- /dev/null
+++ b/v_windows/v/cmd/v/help/bin2v.txt
@@ -0,0 +1,14 @@
+Usage:
+  v bin2v [options] FILE[...]
+
+  Converts a list of arbitrary files into a single v module file.
+
+  You can use this tool to embed binary files, like pictures or fonts inside
+  the executable of a v program, such that it would not need access to external
+  resources during runtime, and it would be as self-contained as possible.
+
+Options:
+  -h, --help                Show this help screen.
+  -m, --module <string>     Name of the generated module.
+  -p, --prefix <string>     A prefix put before each resource name.
+  -w, --write <string>      Write directly to a file with the given name.
diff --git a/v_windows/v/cmd/v/help/bug.txt b/v_windows/v/cmd/v/help/bug.txt
new file mode 100644
index 0000000..6eae2ee
--- /dev/null
+++ b/v_windows/v/cmd/v/help/bug.txt
@@ -0,0 +1,8 @@
+Usage:
+  v bug [options] FILE
+
+  Open a prefilled bug report on GitHub.
+
+Options:
+  -v           Enable verbosity while gathering various information
+  -y           Force the submission of the issue, even if an error occured
diff --git a/v_windows/v/cmd/v/help/build-c.txt b/v_windows/v/cmd/v/help/build-c.txt
new file mode 100644
index 0000000..eefd3da
--- /dev/null
+++ b/v_windows/v/cmd/v/help/build-c.txt
@@ -0,0 +1,256 @@
+Usage: v [C build flags] ['run'] <target.v|target_directory> [run options]
+
+This command compiles the given target, along with their dependencies, into an executable.
+
+This help topic explores the C-backend specific build flags. For more general build help,
+see also `v help build`.
+
+# Interfacing the C compiler, passing options to it:
+   -cc <compiler>
+      Change the C compiler V invokes to the specified compiler.
+      The C compiler is required to support C99.
+      Officially supported/tested C compilers include:
+      `clang`, `gcc`, `tcc`, `mingw-w64` and `msvc`.
+
+   -cflags <flag>
+      Pass the provided flag as is to the C compiler.
+      Can be specified multiple times to provide multiple flags.
+      Use quotes to wrap the flag argument if it contains spaces.
+
+      V also supports the environment variables CFLAGS and LDFLAGS.
+      The contents of the CFLAGS variable will be prepended as is, at the start
+      of the C backend command, right after the name of the compiler.
+      The contents of the LDFLAGS variable will be appended as is, at the end
+      of the C backend command, after all other options.
+
+   -cstrict
+      Turn on additional C warnings. This slows down compilation
+      slightly (~10-10% for gcc), but sometimes provides better diagnosis.
+
+   -showcc
+      Prints the C command that is used to build the program.
+
+   -freestanding
+      Build the executable without dependency on libc.
+      Supported only on `linux` targets currently.
+
+   -bare-builtin-dir <bare-builtin-dir>
+      Use with `-freestanding`. This specifies the directory to the
+      implementation of some basic builtin functions. The list is as follows:
+         bare_print(buf &byte, len u64)
+            Print len charecters from the buffer pointed to by buf to stdout.
+         bare_eprint(buf &byte, len u64)
+            Print len charecters from the buffer pointed to by buf to stderr.
+         bare_panic(msg string)
+            Print "V panic: " + msg, along with an optional backtrace and/or the V commit hash, and then exit.
+         [export: 'malloc']
+         __malloc(n size_t) &C.void
+            Allocates n bytes of memory and returns the pointer to the first byte
+         [export: 'free']
+         __free(ptr &C.void)
+            Free the block of memory ptr allocated by malloc.
+         realloc(old_area &C.void, new_size size_t) &C.void
+            Allocates a new area of size new_size, copies old_area
+            to the new area, and returns a pointer to the new area.
+         [export: 'calloc']
+         __calloc(nmemb size_t, size size_t) &C.void
+            Like malloc, but sets all the bytes to `0` first.
+         memcpy(dest &C.void, src &C.void, n size_t) &C.void
+            Moves n bytes from dest to src, and returns dest
+         memmove(dest &C.void, src &C.void, n size_t) &C.void
+            Like memcpy, but guaranteed to work if dest and src overlap.
+         memcmp(a &C.void, b &C.void, n size_t) int
+            Compare two buffers of length n. If a and b are equal, return 0.
+            Otherwise, return the difference between the first different letter.
+         strlen(s &C.void) size_t
+            Returns the amount of bytes until the first `0`, starting at s
+         memset(s &C.void, c int, n size_t) &C.void
+            Sets n bytes starting at s to c (c is casted to a char)
+            and returns s.
+         getchar() int
+            Read one character from stdin and return it.
+            Print "V Panic" + msg, along with an optional backtrace, and then exit.
+         vsprintf(str &char, format &char, ap va_list) int
+            See `man vsprintf`.
+         vsnprintf(str &char, size size_t, format &char, ap va_list) int
+            See `man vsnprintf`.
+         bare_backtrace() string
+            Return a backtrace that can be printed. If backtraces are not
+            supported, return a message stating that backtraces do not work.
+         [export: 'exit']
+         __exit(code int)
+            Exit with code code. code is allowed to be ignored.
+
+         The module decleration should be `builtin`. The default Linux
+         implementation can be found in `vlib/builtin/linux_bare`.
+
+   -os <os>, -target-os <os>
+      Change the target OS that V tries to compile for.
+      By default, the target OS is the host system.
+      When OS is `cross`, V will attempt to output cross-platform C code.
+
+      Here is a list of the operating systems, supported by V:
+      (CI tests runs on every commit/PR for each of these):
+            `windows`, `linux`, `macos`
+
+      The compiler is known to also work, and has support for these operating
+      systems also (although we do not test it as regularly as for the above):
+            `android`, `ios`,
+            `freebsd`, `openbsd`, `netbsd`, `dragonfly`,
+            `solaris`, `serenity`, `haiku`, `vinix`
+
+      Note that V has the concept of platform files, i.e. files ending
+      with `_platform.c.v`, and usually only the matching files are used in
+      a compilation, and also it supports a `_default.c.v` file, that will
+      be used, when no other more specific `_platform.c.v` file is found.
+      The default is mainly useful for writing shims for new platforms,
+      until a more specialized _platform.c.v is written instead.
+
+      For example, suppose you have these 3 files:
+          x_default.c.v
+          x_windows.c.v
+          x_linux.c.v
+      If you compile with `-os freebsd`, then x_default.c.v will be used.
+      If you compile with `-os linux`, then x_linux.c.v will be used.
+      If you compile with `-os windows`, then x_windows.c.v will be used.
+      If you compile with `-os cross`, then all, *except x_default.c.v*
+      will be used, wrapped in conditional compilation guards, so that
+      the generated C source code will be larger, but will compile on all
+      explicitly supported platforms without source changes.
+
+   -m32, -m64
+      Specify whether 32-bit or 64-bit machine code is generated.
+
+   -sanitize
+      Pass flags related to sanitization to the C compiler.
+
+   -shared
+      Tell V to compile a shared object instead of an executable.
+      The resulting file extension will be `.dll` on Windows and `.so` on Unix systems
+
+# Memory management
+   -autofree
+      Free memory used in functions automatically.
+
+   -manualfree
+      Do not free memory used in functions (the developer has to put x.free()
+      and unsafe{free(x)} calls manually in this mode).
+      Some short lived applications, like compilers and other CLI tools are
+      more performant without autofree.
+
+   -gc <mode>
+      Use and link an optional garbage collector. Only the Boehm–Demers–Weiser
+      garbage collector is supported currently with the following sub-options:
+
+      `-gc boehm` ........... selects the default mode for the architecture
+      `-gc boehm_full` ...... full garbage collection mode
+      `-gc boehm_incr` ...... incremental/generational garbage collection mode
+      `-gc boehm_full_opt` .. optimized full garbage collection mode
+      `-gc boehm_incr_opt` .. optimized incremental/generational garbage collection mode
+      `-gc boehm_leak` ...... leak detection mode
+
+      You need to install a `libgc-dev` package first, or install it manually from:
+
+          https://github.com/ivmai/bdwgc
+
+      Note, `-gc boehm` is complementary to -autofree. The Boehm garbage
+      collector is conservative, and it may make your program significantly
+      slower if it does many small allocations in a loop. This option
+      is intended *mainly* for reducing the memory usage of programs, that
+      process large amounts of text in *batch mode* on low/limited memory
+      environments like small VPSes, and for which a few ms of garbage
+      collection pauses from time to time *do not matter much*.
+
+      The option `-gc boehm_leak` is intended for leak detection in
+      manual memory management. The function `gc_check_leaks()`
+      can be called to get detection results. This function is a no-op
+      when `-gc boehm_leak` is not supplied.
+
+# Miscellaneous:
+   -printfn <fn_name>
+      Print the content of the generated C function named fn_name.
+      You can repeat that many times with different function names.
+      This is useful when you just want to quickly tweak the generated
+      C code, without opening the generated .c file in a text editor,
+      i.e. it enables this workflow:
+
+      1) change vlib/v/gen/cgen.v
+      2) ./v -o v2 cmd/v && ./v2 -printfn main__main bug.v
+      3) inspect the produced C, and goto 1) till the bug is fixed.
+
+      Since V compiles itself very fast (especially with tcc),
+      this loop is very short usually.
+
+   -compress
+      Strip the compiled executable to compress it.
+
+   -live
+      Build the executable with live capabilities (`[live]`).
+
+   -no-prelude
+      Prevents V from generating a prelude in generated .c files, useful for freestanding targets
+      where eg. you replace C standard library with your own, or some definitions/headers break something.
+
+   -custom-prelude <path>
+      Useful for similar use-case as above option, except it replaces V-generated prelude with
+      your custom one loaded from specified <path>.
+
+# Debugging:
+   -g
+      Generate more debug information in the compiled executable.
+      This makes program backtraces more useful.
+      Using debuggers like gdb/lldb with such executables is easier too.
+      Unlike `-cg` (described below), `-g` will enforce V source line numbers
+      so that your debugger and the stacktraces will show you directly
+      what .v file is responsible for each call/panic.
+
+   -cg
+      Like -g, but do not use V source line numbers.
+      When debugging code that wraps C libraries, this option may be
+      more useful than -g, since it will reduce the amount of context
+      switching, that you need to do, while looking at .v and .c sources.
+      This option is usually used in combination with `-keepc`.
+
+   -keepc
+      Do not remove the temporary .tmp.c and .tmp.c.rsp files.
+      Also do not use a random prefix for them, so they would be fixed and predictable.
+
+      NB: when writing low level code that interfaces/wraps an existing C library,
+      it is frequently helpful to use these together: -keepc -cg -showcc -show-c-output
+
+   -showcc
+      Prints the C command that is used to build the program.
+
+   -show-c-output
+      Prints the output, that your C compiler produced, while compiling your program.
+
+   -dump-c-flags file.txt
+      Write all C flags into `file.txt`, one flag per line.
+      If `file.txt` is `-`, then write the flags to stdout, one flag per line.
+
+   -no-rsp
+      By default, V passes all C compiler options to the backend C compiler
+      in so called "response files" (https://gcc.gnu.org/wiki/Response_Files).
+      This works in most cases, since it works around command line length
+      limitations on older systems (and windows), but some C compilers
+      (older versions of tcc for example) do not support them at all. When
+      you use -no-rsp, V will pass the C compiler options directly to the C
+      compiler, on the command line, without writing an .rsp file first.
+
+   -no-std
+      By default, V passes -std=c99 to the C backend, but some compilers do
+      not support that, even though they may be able to compile the produced
+      code, or have other options that can be tuned to allow it.
+      Passing -no-std will remove that flag, and you can then use -cflags ''
+      to pass the other options for your specific C compiler.
+
+-assert aborts
+      Call abort() after an assertion failure. Debuggers usually
+      install signal handlers for SIGABRT, so your program will stop and you
+      will get a backtrace. If you are running your program outside of a
+      debugger, you will most likely get a core dump file.
+
+   -assert backtraces
+      Call print_backtrace() after an assertion failure. Note that
+      backtraces are not implemented yet on all combinations of
+      platform/compiler.
diff --git a/v_windows/v/cmd/v/help/build-js.txt b/v_windows/v/cmd/v/help/build-js.txt
new file mode 100644
index 0000000..2696658
--- /dev/null
+++ b/v_windows/v/cmd/v/help/build-js.txt
@@ -0,0 +1,22 @@
+Usage: v -b js [-options] ['run'] <target.v|target_directory> [run options]
+
+This command compiles the given target, along with their dependencies, into an Javascript source file.
+
+For more general build help, see also `v help build`.
+
+# Interfacing the Javascript Backend code generation, passing options to it:
+   -prod
+      Do not create any JS Doc comments
+
+   -sourcemap
+      Create a source map for debugging
+
+   -sourcemap-inline
+      Embed the source map directly into the JavaScript source file 
+      (currently default, external source map files not implemented)
+
+   -sourcemap-src-include
+      Include the orginal V source files into the generated source map 
+      (default false, all files in the source map are currently referenced by their absolute system file path)
+
+      The supported targets for the JS backend are: ES5 strict
diff --git a/v_windows/v/cmd/v/help/build-native.txt b/v_windows/v/cmd/v/help/build-native.txt
new file mode 100644
index 0000000..8522912
--- /dev/null
+++ b/v_windows/v/cmd/v/help/build-native.txt
@@ -0,0 +1,17 @@
+Usage: v -native [-options] ['run'] <target.v|target_directory> [run options]
+
+This command compiles the given target, along with their dependencies, into an executable using the Native code generation backend.
+
+For more general build help, see also `v help build`.
+
+# Interfacing the Native code generation, passing options to it:
+   -v
+      Display the assembly code generated (that may change to `-showasm` in the future)
+
+   -arch <arch>
+      Select target architecture, right now only `arm64` and `amd64` are supported
+
+   -os <os>, -target-os <os>
+      Change the target OS that V compiles for.
+
+      The supported targets for the native backend are: `macos`, `linux`
diff --git a/v_windows/v/cmd/v/help/build.txt b/v_windows/v/cmd/v/help/build.txt
new file mode 100644
index 0000000..ad87070
--- /dev/null
+++ b/v_windows/v/cmd/v/help/build.txt
@@ -0,0 +1,162 @@
+Usage: v [build flags] ['run'] <target.v|target_directory> [run options]
+
+This command compiles the given target, along with their dependencies, into an executable.
+
+Note that these build flags also work with `run` too, but you need to
+pass them *before* `run` . The argument directly after `run` is assumed
+to be a .v source file or folder containing .v source files.
+Everything after that, is assumed to be flags, that V will ignore itself,
+but will pass to the executable after it is compiled.
+
+This enables you to do for example: `v -cc gcc -g myfile.v run -param1 abcde`
+... which means for V: "compile using gcc, produce debugging information,
+then run `./myfile -param1 abcde` and exit with its exit code".
+
+When compiling packages, V ignores files that end in '_test.v'.
+
+When compiling a single main package, V writes the resulting executable to an output file
+named after the build target. ('v abc.v' and 'v abc/' both write either 'abc' or 'abc.exe')
+The '.exe' suffix is added automatically, when writing a Windows executable.
+By default, the executable is stored in the same directory as the compiled source code.
+
+The -o flag forces V to write the resulting executable or object to the d output file or directory,
+instead of the default behavior described in the last two paragraphs.
+
+You can put common options inside an environment variable named VFLAGS, so that
+you don't have to repeat them.
+
+You can set it like this: `export VFLAGS="-cc clang -g"` on *nix,
+`set VFLAGS=-cc msvc` on Windows.
+
+V respects the TMPDIR environment variable, and will put .tmp.c files in TMPDIR/v/ .
+If you have not set it, a suitable platform specific folder (like /tmp) will be used.
+
+NB: the build flags are shared with the run command too:
+
+   -b <backend>, -backend <backend>
+      Specify the backend to use while building the executable.
+      Current list of supported backends:
+      * `c` (default)       - V outputs C source code which is passed to a C compiler to be compiled.
+      * `js`                - V outputs JS source code which can be passed to NodeJS to be ran.
+      * `native`            - V outputs native executable (see -arch x64|arm64 and -os linux|macos) (EXPERIMENTAL).
+
+   -d <flag>[=<value>], -define <flag>[=<value>]
+      Define the provided flag.
+      If value is not provided, it is assumed to be set to `true`.
+      `value` should be `1` or `0` to indicate `true` and `false` respectively otherwise.
+
+   -g
+      Compile the executable in debug mode, allowing code to be debugged more easily.
+
+   -o <output>, -output <output>
+      Force V to output the executable in a specific location
+      (relative to the current working directory if not absolute).
+
+   -obf, -obfuscate
+      Turn on obfuscation for the code being built. Currently only renames symbols.
+
+   -path
+      Specify the order of path V looks up in while searching for imported dependencies,
+      separated by pipes (`|`). In addition to absolute paths, you can
+      also use these special strings too:
+           @vmodules - replaced with the location of the global ~/.vmodules/ folder
+                       (modules installed with `v install` are there). You can change
+                       its location by setting the environment variable VMODULES.
+           @vlib - replaced with the location of the v's vlib folder.
+      Using these, you can arrange for very flexible search orders for you project, for example:
+           -path "/v/my_project_private_modules|@vlib|@vmodules"
+      By default, -path is just "@vlib|@vmodules" .
+
+   -prod
+      Compile the executable in production mode, where most optimizations are enabled.
+      Note that most V warnings turn to errors, if you pass -prod, so you will have
+      to fix them first.
+
+   -prof, -profile <file.txt>
+      Compile the executable with all functions profiled.
+      The profile results will be stored in `file.txt`.
+      The format is 4 fields, separated by a space, for each v function:
+         a) how many times it was called
+         b) how much *nanoseconds in total* it took
+         c) an average for each function (i.e. (b) / (a) )
+         d) the function name
+      NB: if you want to output the profile info to stdout, use `-profile -`.
+
+   -message-limit <limit>
+      The maximum amount of warnings / errors / notices, that will be accumulated (defaults to 100).
+      The checker will abort prematurely once this limit has been reached.
+      Setting this to 0 or a negative value, will disable the limit.
+
+   -profile-no-inline
+      Skip [inline] functions when profiling.
+
+   -stats
+      Enable more detailed statistics reporting, while compiling test files.
+      You can use that with `v test` too, for example:
+        v -stats test vlib/
+      ... will run test_ functions inside all _test.v files inside vlib/ ,
+      and will report detailed statistics about how much time each test_ function took, how many
+      assertions were made, how many tests passed/failed and so on.
+
+   -translated
+      Enable features that are discouraged in regular V code but required for translated V code.
+
+   -v
+      Enable verbosity in the V compiler while compiling
+
+   -print-v-files
+      Just print the list of all parsed .v files, then stop processing further.
+      This is useful for running external processing tools:
+        ./v -print-v-files cmd/v | etags -L -
+      ... will generate a TAGS file, that emacs can then use to jump
+      to the definition of functions used by v itself. For vim:
+        ./v -print-v-files cmd/v | ctags -L -
+      ... will generate a simillar tags file, that vi compatible editors can use.
+      NB: an useful, although not entirely accurate regexp based Universal Ctags options file
+      for V is located in `.ctags.d/v.ctags` . If you use https://ctags.io/ , it will be used
+      up automatically, or you can specify it explicitly with --options=.ctags.d/v.ctags .
+
+   -color, -nocolor
+      Force the use of ANSI colors for the V error/warning messages, or disable them completely.
+      By default, the V compiler tries to show its errors/warnings in ANSI color. The heuristic
+      that it uses to detect whether or not to use ANSI colors may not work in all cases.
+      These options allow you to override the default detection.
+
+   -check-syntax
+      Only scan and parse the files, but then stop. Useful for very quick syntax checks.
+
+   -show-timings
+      Print a summary about how long each compiler stage took, for example:
+         PARSE: 152ms
+         CHECK: 62ms
+         C GEN: 103ms
+         C tcc: 95ms
+
+      Related to -show-timings, is the ability to compile a special instrumented
+      v compiler with this command:
+      `v -d time_parsing -d time_checking -d time_cgening -d time_v self`
+      The instrumented version will print detailed timing stats while processing
+      each .v file.
+
+   -w
+      Hide all warnings.
+
+   -W
+      Treat *all V warnings* as errors, even in development builds.
+
+   -Wfatal-errors
+      Unconditionally exit with exit(1) after the first error.
+      Useful for scripts/tooling that calls V.
+
+   -Wimpure-v
+      Warn about using C. or JS. symbols in plain .v files.
+      These should be moved in .c.v and .js.v .
+      NB: in the future, this will be turned ON by default,
+      and will become an error, after vlib modules are cleaned up.
+
+For C-specific build flags, use `v help build-c`.
+For JS-specific build flags, use `v help build-js`.
+For Native-specific build flags, use `v help build-native`.
+
+See also:
+   `v help run` for documentation regarding `v run`.
diff --git a/v_windows/v/cmd/v/help/check-md.txt b/v_windows/v/cmd/v/help/check-md.txt
new file mode 100644
index 0000000..145ffee
--- /dev/null
+++ b/v_windows/v/cmd/v/help/check-md.txt
@@ -0,0 +1,22 @@
+check-md is a tool to check the passed markdown files for correct ```v ``` code blocks
+and other style violations like too long lines/links etc...
+
+Usage:
+	a) `v check-md [flags] <...files>` - Check the given .md files.
+	b) `v check-md [flags] <...dirs>`  - Check *all* files in the given directories.
+	Note: You can also combine files and directories.
+
+Flags:
+	-silent               Do not show a progress bar.
+	-w, -hide-warnings    Do not print warnings, only errors.
+
+NB: There are several special keywords, which you can put after the code fences for v.
+These are:
+	compile      - Default, can be omitted. The example will be compiled and formatting is verified.
+	live         - Compile hot reload examples with the ´-live´ flag set and verify formatting.
+	ignore       - Ignore the example, useful for examples that just use the syntax highlighting
+	failcompile  - Known failing compilation. Useful for examples demonstrating compiler errors.
+	oksyntax     - Should parse and be formatted but may not compile. Useful for partial examples.
+	badsyntax    - Known bad syntax, it should not even parse.
+	wip          - Like ignore; a planned feature; easy to search.
+	nofmt        - Disable fmt verification for individual code blocks.
diff --git a/v_windows/v/cmd/v/help/default.txt b/v_windows/v/cmd/v/help/default.txt
new file mode 100644
index 0000000..77d3b57
--- /dev/null
+++ b/v_windows/v/cmd/v/help/default.txt
@@ -0,0 +1,60 @@
+V is a tool for managing V source code.
+
+Usage:
+   v [options] [command] [arguments]
+
+Examples:
+   v hello.v                 Compile the file `hello.v` and output it as `hello` or `hello.exe`.
+   v run hello.v             Same as above but also run the produced executable immediately after compilation.
+   v -cg run hello.v         Same as above, but make debugging easier (in case your program crashes).
+   v -o h.c hello.v          Translate `hello.v` to `h.c`. Do not compile further.
+   v -o - hello.v            Translate `hello.v` and output the C source code to stdout. Do not compile further.
+
+   v watch hello.v           Re-does the same compilation, when a source code change is detected.
+                             The program is only compiled, not run.
+   v watch run hello.v       Re-runs the same `hello.v` file, when a source code change is detected.
+
+V supports the following commands:
+* New project scaffolding:
+   new               Setup the file structure for a V project (in a sub folder).
+   init              Setup the file structure for an already existing V project.
+
+* Ordinary development:
+   run               Compile and run a V program.
+   test              Run all test files in the provided directory.
+   fmt               Format the V code provided.
+   vet               Report suspicious code constructs.
+   doc               Generate the documentation for a V module.
+   vlib-docs         Generate and open the documentation of all the vlib modules.
+   repl              Run the REPL.
+   watch             Re-compile/re-run a source file, each time it is changed.
+
+* Installation/self updating:
+   symlink           Create a symbolic link for V.
+   up                Run the V self-updater.
+   self [-prod]      Run the V self-compiler, use -prod to optimize compilation.
+   version           Print the version text and exits.
+
+* Module/package management:
+   install           Install a module from VPM.
+   remove            Remove a module that was installed from VPM.
+   search            Search for a module from VPM.
+   update            Update an installed module from VPM.
+   upgrade           Upgrade all the outdated modules.
+   list              List all installed modules.
+   outdated          List installed modules that need updates.
+   show              Display information about a module on vpm
+
+* Others:
+   doctor            Display some useful info about your system to help reporting bugs.
+   translate         Translate C code to V (coming soon in 0.3).
+   tracev            Produce a tracing version of the v compiler.
+                     Use `tracev yourfile.v` when the compiler panics.
+                     NB: `tracev` is much slower and more verbose than ordinary `v`
+
+Use "v help <command>" for more information about a command, example: `v help build`, `v help build-c`, `v help build-native`
+Use "v help other" to see less frequently used commands.
+Use "v help topics" to see a list of all known help topics.
+
+Note: Help is required to write more help topics.
+Only build, new, init, doc, fmt, vet, run, test, watch, search, install, remove, update, bin2v, check-md are properly documented currently.
diff --git a/v_windows/v/cmd/v/help/doc.txt b/v_windows/v/cmd/v/help/doc.txt
new file mode 100644
index 0000000..afbc396
--- /dev/null
+++ b/v_windows/v/cmd/v/help/doc.txt
@@ -0,0 +1,35 @@
+Usage:
+  v doc [options] [MODULE / DIRECTORY / FILE] [symbol name]
+
+Examples:
+  v doc os
+  v doc os File
+  v doc -no-color os
+  v doc -o math.html math
+  v doc -m -f html vlib/
+
+  Generates the documentation of a given MODULE, DIRECTORY, or FILE
+  and prints or saves them to its desired format. It can generate HTML, JSON,
+  or Markdown format.
+
+Options:
+  -all            Includes private and public functions/methods/structs/consts/enums.
+  -f              Specifies the output format to be used. Available formats are:
+                  md/markdown, json, text, stdout and html/htm
+  -h, -help       Prints this help text.
+  -m              Generate docs for modules listed in that folder.
+  -o              Specifies the output file/folder path where to store the generated docs.
+                  Set it to "stdout" to print the output instead of saving the contents
+                  to a file.
+  -color          Forces stdout colorize output.
+  -no-color       Forces plain text output, without ANSI colors.
+  -readme         Include README.md to docs if present.
+  -v              Enables verbose logging. For debugging purposes.
+  -no-timestamp   Omits the timestamp in the output file.
+
+For HTML mode:
+  -inline-assets  Embeds the contents of the CSS and JS assets into the webpage directly.
+
+For plain text mode:
+  -l              Shows the locations of the generated signatures.
+  -comments       Includes comments in the output.
diff --git a/v_windows/v/cmd/v/help/doctor.txt b/v_windows/v/cmd/v/help/doctor.txt
new file mode 100644
index 0000000..05ed7ec
--- /dev/null
+++ b/v_windows/v/cmd/v/help/doctor.txt
@@ -0,0 +1,3 @@
+Usage: v doctor
+
+Display some useful info about your system necessary for bug reports.
diff --git a/v_windows/v/cmd/v/help/fmt.txt b/v_windows/v/cmd/v/help/fmt.txt
new file mode 100644
index 0000000..cdfc8f4
--- /dev/null
+++ b/v_windows/v/cmd/v/help/fmt.txt
@@ -0,0 +1,35 @@
+Usage:
+  v fmt [options] path_to_source.v [path_to_other_source.v]
+  v fmt [options] path/to/dir [path/to/other_dir]
+  cat source.v | v fmt
+        Read source code from stdin, output formatted file to stdout.
+
+Formats the given V source files or recursively formats all files in the directory,
+then prints their formatted source to stdout.
+
+Options:
+  -c      Check if a file is already formatted. If not, print the filepath and exit with code 2.
+          Compared to -verify it is quicker but has a small trade-off in precision.
+
+  -diff   Display the differences between the formatted source(s) and the original source(s).
+          This will attempt to find a working `diff` command automatically unless you
+          specify one with the VDIFF_TOOL environment variable.
+
+  -l      List files whose formatting differs from vfmt.
+
+  -w      Write result to (source) file(s) instead of to stdout.
+
+  -debug  Print the kinds of encountered AST statements/expressions on stderr.
+
+  -verify Make sure the provided file is already formatted. Useful for checking code contributions
+          in CI for example.
+
+Environment Variables:
+  VDIFF_TOOL      A command-line tool that will be executed with the original file path
+                  and a temporary formatted file path as arguments. e.g.
+                  `VDIFF_TOOL=opendiff v fmt -diff path/to/file.v` will become:
+                  opendiff path/to/file.v /tmp/v/vfmt_file.v
+
+  VDIFF_OPTIONS   A set of command-line options to be sent immediately after the
+                  `diff` command. e.g.
+                  VDIFF_OPTIONS="-W 80 -y" v fmt -diff path/to/file.v /tmp/v/vfmt_file.v
diff --git a/v_windows/v/cmd/v/help/help.v b/v_windows/v/cmd/v/help/help.v
new file mode 100644
index 0000000..d54bf06
--- /dev/null
+++ b/v_windows/v/cmd/v/help/help.v
@@ -0,0 +1,47 @@
+module help
+
+// TODO: move this file outside internal, and merge it with cmd/tools/modules/vhelp/vhelp.v .
+import os
+import v.pref
+
+const (
+	unknown_topic = '`v help`: unknown help topic provided. Use `v help` for usage information.'
+)
+
+pub fn print_and_exit(topic string) {
+	vexe := pref.vexe_path()
+	vroot := os.dir(vexe)
+	topicdir := os.join_path(vroot, 'cmd', 'v', 'help')
+
+	for b in topic {
+		if (b >= `a` && b <= `z`) || b == `-` || (b >= `0` && b <= `9`) {
+			continue
+		}
+		eprintln(help.unknown_topic)
+		exit(1)
+	}
+	// `init` has the same help topic as `new`
+	name := if topic == 'init' { 'new' } else { topic }
+	if topic == 'topics' {
+		println(known_topics(topicdir))
+		exit(0)
+	}
+	target_topic := os.join_path(topicdir, '${name}.txt')
+	content := os.read_file(target_topic) or {
+		eprintln(help.unknown_topic)
+		eprintln(known_topics(topicdir))
+		exit(1)
+	}
+	println(content)
+	exit(0)
+}
+
+fn known_topics(topicdir string) string {
+	mut res := []string{}
+	res << 'Known help topics:'
+	topic_files := os.glob(os.join_path(topicdir, '*.txt')) or { [] }
+	mut topics := topic_files.map(os.file_name(it).replace('.txt', ''))
+	topics.sort()
+	res << topics.join(', ')
+	return res.join('')
+}
diff --git a/v_windows/v/cmd/v/help/help_test.v b/v_windows/v/cmd/v/help/help_test.v
new file mode 100644
index 0000000..ac395b6
--- /dev/null
+++ b/v_windows/v/cmd/v/help/help_test.v
@@ -0,0 +1,22 @@
+import os
+
+fn test_help() {
+	vexe := os.getenv('VEXE')
+	res := os.execute('"$vexe" help')
+	assert res.exit_code == 0
+	assert res.output.starts_with('V is a tool for managing V source code.')
+}
+
+fn test_help_as_short_option() {
+	vexe := os.getenv('VEXE')
+	res := os.execute('"$vexe" -h')
+	assert res.exit_code == 0
+	assert res.output.starts_with('V is a tool for managing V source code.')
+}
+
+fn test_help_as_long_option() {
+	vexe := os.getenv('VEXE')
+	res := os.execute('"$vexe" --help')
+	assert res.exit_code == 0
+	assert res.output.starts_with('V is a tool for managing V source code.')
+}
diff --git a/v_windows/v/cmd/v/help/init.txt b/v_windows/v/cmd/v/help/init.txt
new file mode 100644
index 0000000..235cb0b
--- /dev/null
+++ b/v_windows/v/cmd/v/help/init.txt
@@ -0,0 +1,4 @@
+Usage:
+  v init
+
+Setup the file structure for an already existing V project.
diff --git a/v_windows/v/cmd/v/help/install.txt b/v_windows/v/cmd/v/help/install.txt
new file mode 100644
index 0000000..ba0b3cb
--- /dev/null
+++ b/v_windows/v/cmd/v/help/install.txt
@@ -0,0 +1,13 @@
+Usage:
+  v install [MODULE...]
+    Installs each MODULE.
+
+    If no MODULEs, the modules listed in the `v.mod` file are installed instead.
+
+Options:
+  --vpm         - [Default] Install from vpm
+  --git         - Install from git repository url
+  --hg          - Install from mercurial repository url
+  -help         - Show usage info.
+  -v            - Print more details about the performed operation.
+  -server-url   - When doing network operations, use this vpm server. Can be given multiple times.
diff --git a/v_windows/v/cmd/v/help/list.txt b/v_windows/v/cmd/v/help/list.txt
new file mode 100644
index 0000000..33e28f1
--- /dev/null
+++ b/v_windows/v/cmd/v/help/list.txt
@@ -0,0 +1,3 @@
+Usage: v list
+
+List all installed modules.
diff --git a/v_windows/v/cmd/v/help/new.txt b/v_windows/v/cmd/v/help/new.txt
new file mode 100644
index 0000000..2c09e86
--- /dev/null
+++ b/v_windows/v/cmd/v/help/new.txt
@@ -0,0 +1,18 @@
+Usage:
+  v new [NAME] [DESCRIPTION]
+	Sets up a new V project with a 'v.mod' file, and a 'main.v' "Hello World"
+	file, and performs 'git init' (if git is installed on the system).
+
+	If NAME is given, the project will be setup in a new directory with that
+	name, and that name will be added to the 'v.mod' file. If no name is given,
+	the user will be prompted for a name.
+
+	If DESCRIPTION is given, the 'v.mod' file is updated with said description.
+
+  v init
+	Sets up a V project within the current directory.
+
+	If no '.v' file exists, then will create a 'main.v' file.
+	If no 'v.mod' file exists, one will be created.
+	If the current directory is not already controlled with 'git', will perform
+	'git init' (if git is installed on the system).
diff --git a/v_windows/v/cmd/v/help/other.txt b/v_windows/v/cmd/v/help/other.txt
new file mode 100644
index 0000000..4958f7e
--- /dev/null
+++ b/v_windows/v/cmd/v/help/other.txt
@@ -0,0 +1,33 @@
+These are utility commands that you can also launch through v,
+but which are used less frequently by users:
+
+   ast                Generate a json representation of the AST for a given .v file.
+   
+   bug                Post an issue on the V's issue tracker, including the failing program, and some diagnostic information.
+
+   bin2v              Convert a binary file to a v source file,
+                      that can be later embedded in a module or program.
+
+   build-examples     Test if all examples can be built.
+   build-tools        Test if all tools can be built.
+   build-vbinaries    Test if V can be built with different configuration.
+
+   check-md           Check that V examples in markdown files are formatted and can compile.
+
+   setup-freetype     Setup thirdparty freetype on Windows.
+
+   test-all           Run most checks, that the CI does locally.
+                      It may take over 2 minutes, and it needs internet connectivity too,
+                      because it tries to also verify that `v install` works.
+
+   test-fmt           Test if all files in the current directory are formatted properly.
+
+   test-parser        Test that the V parser works with the given files, as if
+                      they were typed by a human programmer, one character at a time.
+                      NB: *very slow* for longer files (tens of seconds for 1KB .v file).
+                      Mainly useful as a parser bug finder for the V Language Server project.
+
+   test-self          Test if V is working properly by running all tests, including the compiler ones.
+                      NB: this can 1-2 minutes to run.
+
+   wipe-cache         Remove the V cache folder. Useful for cleaning the cache, and guaranteeing a clean build.
diff --git a/v_windows/v/cmd/v/help/outdated.txt b/v_windows/v/cmd/v/help/outdated.txt
new file mode 100644
index 0000000..82e7ce4
--- /dev/null
+++ b/v_windows/v/cmd/v/help/outdated.txt
@@ -0,0 +1,3 @@
+Usage: v outdated
+
+List all installed modules that need updates.
diff --git a/v_windows/v/cmd/v/help/remove.txt b/v_windows/v/cmd/v/help/remove.txt
new file mode 100644
index 0000000..0c02841
--- /dev/null
+++ b/v_windows/v/cmd/v/help/remove.txt
@@ -0,0 +1,9 @@
+Usage:
+  v remove [MODULE...]
+    Removes all listed MODULEs.
+	If no MODULE is provided, removes ALL installed modules.
+
+Options:
+  -help        - Show usage info.
+  -v           - Print more details about the performed operation.
+  -server-url  - When doing network operations, use this vpm server. Can be given multiple times.
diff --git a/v_windows/v/cmd/v/help/repl.txt b/v_windows/v/cmd/v/help/repl.txt
new file mode 100644
index 0000000..08abb6a
--- /dev/null
+++ b/v_windows/v/cmd/v/help/repl.txt
@@ -0,0 +1,3 @@
+Usage: v repl
+
+This command runs the V REPL.
diff --git a/v_windows/v/cmd/v/help/run.txt b/v_windows/v/cmd/v/help/run.txt
new file mode 100644
index 0000000..d214cee
--- /dev/null
+++ b/v_windows/v/cmd/v/help/run.txt
@@ -0,0 +1,13 @@
+Usage: v [build flags] run <file.v|directory|-> [arguments...]
+
+This command is equivalent to running `v build` and running the compiled executable.
+The executable is passed the arguments as provided in [arguments...].
+
+If the target is '-', it means that the V source code to build comes from stdin.
+If the '-o' option is not specified, and the target is '-', a temporary base name for the executable will be used.
+
+The exit status of run will be:
+* `1` if the compilation failed.
+* The exit code of the compiled executable otherwise.
+
+For more about build flags, see `v help build`.
diff --git a/v_windows/v/cmd/v/help/search.txt b/v_windows/v/cmd/v/help/search.txt
new file mode 100644
index 0000000..a405168
--- /dev/null
+++ b/v_windows/v/cmd/v/help/search.txt
@@ -0,0 +1,10 @@
+Usage:
+  v search KEYWORD[...]
+    Searches https://vpm.vlang.io/ for matching KEYWORDs and displays the
+    details
+
+Options:
+  -help         - Show usage info.
+  -v            - Print more details about the performed operation.
+  -server-url   - When doing network operations, use this vpm server. Can be
+                  given multiple times.
diff --git a/v_windows/v/cmd/v/help/self.txt b/v_windows/v/cmd/v/help/self.txt
new file mode 100644
index 0000000..3e0ce49
--- /dev/null
+++ b/v_windows/v/cmd/v/help/self.txt
@@ -0,0 +1,5 @@
+Usage: v self
+
+Rebuild V with the passed options.
+
+Options: All other options are passed to the build command. (e.g. -prod)
diff --git a/v_windows/v/cmd/v/help/show.txt b/v_windows/v/cmd/v/help/show.txt
new file mode 100644
index 0000000..c2c0fff
--- /dev/null
+++ b/v_windows/v/cmd/v/help/show.txt
@@ -0,0 +1,3 @@
+Usage: v show
+
+Display information about a module on vpm.
diff --git a/v_windows/v/cmd/v/help/symlink.txt b/v_windows/v/cmd/v/help/symlink.txt
new file mode 100644
index 0000000..1059003
--- /dev/null
+++ b/v_windows/v/cmd/v/help/symlink.txt
@@ -0,0 +1,5 @@
+Usage: v symlink
+
+This command adds a symlink for the V compiler executable.
+
+Note that on Unix systems this command requires write permissions to /usr/local/bin to work.
diff --git a/v_windows/v/cmd/v/help/test.txt b/v_windows/v/cmd/v/help/test.txt
new file mode 100644
index 0000000..a49da91
--- /dev/null
+++ b/v_windows/v/cmd/v/help/test.txt
@@ -0,0 +1,18 @@
+Usage:
+  v [-stats] test FILE|DIRECTORY[...]
+    Runs test functions in the given FILEs and DIRECTORYs
+
+    If '-stats' is given, more statistics about the tests are printed along
+    with a report of passes/failures
+
+NB 1: very frequently, when you work on a module you can cd into its folder,
+and then you can perform:
+	  v test .
+... to run all the module's '_test.v' files.
+
+NB 2: V builtin testing requires you to name your files with a _test.v
+suffix, and to name your test functions with test_ prefix. Each 'test_'
+function in a '_test.v' file will be called automatically by the test
+framework. You can use `assert condition` inside each 'test_' function.
+If the asserted condition fails, then v will record that and produce a
+more detailed error message about where the failure was.
diff --git a/v_windows/v/cmd/v/help/tracev.txt b/v_windows/v/cmd/v/help/tracev.txt
new file mode 100644
index 0000000..2d4b5a5
--- /dev/null
+++ b/v_windows/v/cmd/v/help/tracev.txt
@@ -0,0 +1,3 @@
+Usage: v tracev 
+
+Produce a tracing version of the V compiler.
diff --git a/v_windows/v/cmd/v/help/up.txt b/v_windows/v/cmd/v/help/up.txt
new file mode 100644
index 0000000..7ae9447
--- /dev/null
+++ b/v_windows/v/cmd/v/help/up.txt
@@ -0,0 +1,7 @@
+Usage: v up
+
+Update the V compiler to the latest version from https://github.com/vlang/v.
+
+Options:
+  -v           - Print more details about the update.
+  -prod        - Compile the updated V with the -prod flag.
diff --git a/v_windows/v/cmd/v/help/update.txt b/v_windows/v/cmd/v/help/update.txt
new file mode 100644
index 0000000..4fa9a91
--- /dev/null
+++ b/v_windows/v/cmd/v/help/update.txt
@@ -0,0 +1,10 @@
+Usage:
+  v update [MODULE]...
+	Updates each MODULE.
+
+	With no MODULE, ALL installed modules are updated to their latest versions.
+
+Options:
+  -help        - Show usage info.
+  -v           - Print more details about the update.
+  -server-url  - When doing network operations, use this vpm server. Can be given multiple times.
diff --git a/v_windows/v/cmd/v/help/upgrade.txt b/v_windows/v/cmd/v/help/upgrade.txt
new file mode 100644
index 0000000..7aa62fb
--- /dev/null
+++ b/v_windows/v/cmd/v/help/upgrade.txt
@@ -0,0 +1,7 @@
+Usage: v upgrade
+
+Upgrade all outdated modules.
+
+Options:
+  -help        - Show usage info.
+  -v           - Print more details about the upgrade.
diff --git a/v_windows/v/cmd/v/help/version.txt b/v_windows/v/cmd/v/help/version.txt
new file mode 100644
index 0000000..7c1a4bd
--- /dev/null
+++ b/v_windows/v/cmd/v/help/version.txt
@@ -0,0 +1,3 @@
+Usage: v version
+
+Print the version of V installed.
diff --git a/v_windows/v/cmd/v/help/vet.txt b/v_windows/v/cmd/v/help/vet.txt
new file mode 100644
index 0000000..7a0d2bf
--- /dev/null
+++ b/v_windows/v/cmd/v/help/vet.txt
@@ -0,0 +1,18 @@
+Usage:
+  v vet [options] path_to_source.v [path_to_other_source.v]
+  v vet [options] path/to/dir [path/to/other_dir]
+
+Reports suspicious code constructs.
+
+Options:
+  -W
+     Exit with code 1, even if vet only reported warnings. Useful for checks in CI.
+
+  -w, -hide-warnings
+     Do not print warnings to stderr.
+
+  -v, -verbose
+     Enable verbose logging.
+
+  -force
+     (NB: vet development only!) Do not skip the vet regression tests.
diff --git a/v_windows/v/cmd/v/help/vpm.txt b/v_windows/v/cmd/v/help/vpm.txt
new file mode 100644
index 0000000..037084d
--- /dev/null
+++ b/v_windows/v/cmd/v/help/vpm.txt
@@ -0,0 +1,8 @@
+Usage:
+  a) v install [MODULE...]
+  b) v update [MODULE...]
+  c) v remove [MODULE...]
+  d) v search KEYWORD[...]
+  e) v show [MODULE...]
+
+  You can also pass -h or --help after each vpm command from the above, to see more details about it.
diff --git a/v_windows/v/cmd/v/help/watch.txt b/v_windows/v/cmd/v/help/watch.txt
new file mode 100644
index 0000000..9b69207
--- /dev/null
+++ b/v_windows/v/cmd/v/help/watch.txt
@@ -0,0 +1,28 @@
+v watch [--clear] [--ignore .db] [--add /path/to/a/file.v] [other V options] [run] program.v
+
+Description:
+`v watch` collects all .v files needed for a compilation, then when
+any of the .v source files changes, it re-runs the compilation.
+
+Options:
+  -s, --silent              Be more silent; do not print the watch timestamp before each re-run.
+
+  -c, --clear               Clears the terminal before each re-run.
+
+  -a, --add <string>        Add more files to be watched.
+                            Useful with `v watch -add=feature.v run cmd/v feature.v`,
+                            when you want to change *both* the V compiler,
+                            and the `feature.v` file.
+
+  -i, --ignore <string>     Ignore files having these extensions.
+                            Useful with `v watch -ignore=.db run vwebserver.v`,
+                            if your `vwebserver` writes to an sqlite.db file in the
+                            same folder.
+
+  --before <string>         A command to execute *before* each re-run. Example: --before 'v wipe-cache'
+  
+  --after <string>          A command to execute *after* each re-run. Example: --after 'rm -rf /tmp/v/'
+	
+You can also customise the timeout, after `v watch` will re-start a monitored
+program automatically, even if it was not changed by setting the enviroment 
+variable VWATCH_TIMEOUT (in seconds). By default, it is 5 min. (300 seconds).
diff --git a/v_windows/v/cmd/v/v.v b/v_windows/v/cmd/v/v.v
new file mode 100644
index 0000000..dde303d
--- /dev/null
+++ b/v_windows/v/cmd/v/v.v
@@ -0,0 +1,146 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module main
+
+import help
+import os
+import term
+import v.pref
+import v.util
+import v.util.version
+import v.builder
+
+const (
+	external_tools                      = [
+		'bin2v',
+		'bug',
+		'build-examples',
+		'build-tools',
+		'build-vbinaries',
+		'check-md',
+		'complete',
+		'doc',
+		'doctor',
+		'fmt',
+		'repl',
+		'self',
+		'setup-freetype',
+		'symlink',
+		'test',
+		'test-all', /* runs most of the tests and other checking tools, that will be run by the CI */
+		'test-cleancode',
+		'test-fmt',
+		'test-parser',
+		'test-self',
+		'tracev',
+		'up',
+		'vet',
+		'wipe-cache',
+		'watch',
+		'ast',
+	]
+	list_of_flags_that_allow_duplicates = ['cc', 'd', 'define', 'cf', 'cflags']
+)
+
+fn main() {
+	mut timers_should_print := false
+	$if time_v ? {
+		timers_should_print = true
+	}
+	mut timers := util.new_timers(timers_should_print)
+	timers.start('v total')
+	defer {
+		timers.show('v total')
+	}
+	timers.start('v start')
+	timers.show('v start')
+	timers.start('parse_CLI_args')
+	args := os.args[1..]
+	// args = 123
+	if args.len == 0 || args[0] in ['-', 'repl'] {
+		// Running `./v` without args launches repl
+		if args.len == 0 {
+			if os.is_atty(0) != 0 {
+				cmd_exit := term.highlight_command('exit')
+				cmd_help := term.highlight_command('v help')
+				file_main := term.highlight_command('main.v')
+				cmd_run := term.highlight_command('v run main.v')
+				println('Welcome to the V REPL (for help with V itself, type $cmd_exit, then run $cmd_help).')
+				eprintln('  NB: the REPL is highly experimental. For best V experience, use a text editor,')
+				eprintln('  save your code in a $file_main file and execute: $cmd_run')
+			} else {
+				mut args_and_flags := util.join_env_vflags_and_os_args()[1..].clone()
+				args_and_flags << ['run', '-']
+				pref.parse_args(external_tools, args_and_flags)
+			}
+		}
+		util.launch_tool(false, 'vrepl', os.args[1..])
+		return
+	}
+	args_and_flags := util.join_env_vflags_and_os_args()[1..]
+	prefs, command := pref.parse_args(external_tools, args_and_flags)
+	if prefs.use_cache && os.user_os() == 'windows' {
+		eprintln('-usecache is currently disabled on windows')
+		exit(1)
+	}
+	timers.show('parse_CLI_args')
+	// Start calling the correct functions/external tools
+	// Note for future contributors: Please add new subcommands in the `match` block below.
+	if command in external_tools {
+		// External tools
+		util.launch_tool(prefs.is_verbose, 'v' + command, os.args[1..])
+		return
+	}
+	match command {
+		'help' {
+			invoke_help_and_exit(args)
+		}
+		'new', 'init' {
+			util.launch_tool(prefs.is_verbose, 'vcreate', os.args[1..])
+			return
+		}
+		'translate' {
+			eprintln('Translating C to V will be available in V 0.3')
+			exit(1)
+		}
+		'install', 'list', 'outdated', 'remove', 'search', 'show', 'update', 'upgrade' {
+			util.launch_tool(prefs.is_verbose, 'vpm', os.args[1..])
+			return
+		}
+		'vlib-docs' {
+			util.launch_tool(prefs.is_verbose, 'vdoc', ['doc', 'vlib'])
+		}
+		'get' {
+			eprintln('V Error: Use `v install` to install modules from vpm.vlang.io')
+			exit(1)
+		}
+		'version' {
+			println(version.full_v_version(prefs.is_verbose))
+			return
+		}
+		else {}
+	}
+	if command in ['run', 'build', 'build-module'] || command.ends_with('.v') || os.exists(command) {
+		// println('command')
+		// println(prefs.path)
+		builder.compile(command, prefs)
+		return
+	}
+	if prefs.is_help {
+		invoke_help_and_exit(args)
+	}
+	eprintln('v $command: unknown command\nRun ${term.highlight_command('v help')} for usage.')
+	exit(1)
+}
+
+fn invoke_help_and_exit(remaining []string) {
+	match remaining.len {
+		0, 1 { help.print_and_exit('default') }
+		2 { help.print_and_exit(remaining[1]) }
+		else {}
+	}
+	println('${term.highlight_command('v help')}: provide only one help topic.')
+	println('For usage information, use ${term.highlight_command('v help')}.')
+	exit(1)
+}