1 files changed, 88 insertions, 0 deletions
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
+}