From f5c4671bfbad96bf346bd7e9a21fc4317b4959df Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Sat, 3 Dec 2022 17:00:20 +0530
Subject: Adds most of the tools

---
 v_windows/v/old/examples/term.ui/text_editor.v | 583 +++++++++++++++++++++++++
 1 file changed, 583 insertions(+)
 create mode 100644 v_windows/v/old/examples/term.ui/text_editor.v

(limited to 'v_windows/v/old/examples/term.ui/text_editor.v')

diff --git a/v_windows/v/old/examples/term.ui/text_editor.v b/v_windows/v/old/examples/term.ui/text_editor.v
new file mode 100644
index 0000000..78e6e40
--- /dev/null
+++ b/v_windows/v/old/examples/term.ui/text_editor.v
@@ -0,0 +1,583 @@
+// Copyright (c) 2020 Lars Pontoppidan. All rights reserved.
+// Use of this source code is governed by the MIT license distributed with this software.
+// Don't use this editor for any serious work.
+// A lot of funtionality is missing compared to your favourite editor :)
+import strings
+import math.mathutil as mu
+import os
+import term.ui as tui
+
+enum Movement {
+	up
+	down
+	left
+	right
+	home
+	end
+	page_up
+	page_down
+}
+
+struct View {
+pub:
+	raw    string
+	cursor Cursor
+}
+
+struct App {
+mut:
+	tui           &tui.Context = 0
+	ed            &Buffer      = 0
+	current_file  int
+	files         []string
+	status        string
+	t             int
+	magnet_x      int
+	footer_height int = 2
+	viewport      int
+}
+
+fn (mut a App) set_status(msg string, duration_ms int) {
+	a.status = msg
+	a.t = duration_ms
+}
+
+fn (mut a App) save() {
+	if a.cfile().len > 0 {
+		b := a.ed
+		os.write_file(a.cfile(), b.raw()) or { panic(err) }
+		a.set_status('Saved', 2000)
+	} else {
+		a.set_status('No file loaded', 4000)
+	}
+}
+
+fn (mut a App) cfile() string {
+	if a.files.len == 0 {
+		return ''
+	}
+	if a.current_file >= a.files.len {
+		return ''
+	}
+	return a.files[a.current_file]
+}
+
+fn (mut a App) visit_prev_file() {
+	if a.files.len == 0 {
+		a.current_file = 0
+	} else {
+		a.current_file = (a.current_file + a.files.len - 1) % a.files.len
+	}
+	a.init_file()
+}
+
+fn (mut a App) visit_next_file() {
+	if a.files.len == 0 {
+		a.current_file = 0
+	} else {
+		a.current_file = (a.current_file + a.files.len + 1) % a.files.len
+	}
+	a.init_file()
+}
+
+fn (mut a App) footer() {
+	w, h := a.tui.window_width, a.tui.window_height
+	mut b := a.ed
+	// flat := b.flat()
+	// snip := if flat.len > 19 { flat[..20] } else { flat }
+	finfo := if a.cfile().len > 0 { ' (' + os.file_name(a.cfile()) + ')' } else { '' }
+	mut status := a.status
+	a.tui.draw_text(0, h - 1, '─'.repeat(w))
+	footer := '$finfo Line ${b.cursor.pos_y + 1:4}/${b.lines.len:-4}, Column ${b.cursor.pos_x + 1:3}/${b.cur_line().len:-3} index: ${b.cursor_index():5} (ESC = quit, Ctrl+s = save)'
+	if footer.len < w {
+		a.tui.draw_text((w - footer.len) / 2, h, footer)
+	} else if footer.len == w {
+		a.tui.draw_text(0, h, footer)
+	} else {
+		a.tui.draw_text(0, h, footer[..w])
+	}
+	if a.t <= 0 {
+		status = ''
+	} else {
+		a.tui.set_bg_color(
+			r: 200
+			g: 200
+			b: 200
+		)
+		a.tui.set_color(
+			r: 0
+			g: 0
+			b: 0
+		)
+		a.tui.draw_text((w + 4 - status.len) / 2, h - 1, ' $status ')
+		a.tui.reset()
+		a.t -= 33
+	}
+}
+
+struct Buffer {
+	tab_width int = 4
+pub mut:
+	lines  []string
+	cursor Cursor
+}
+
+fn (b Buffer) flat() string {
+	return b.raw().replace_each(['\n', r'\n', '\t', r'\t'])
+}
+
+fn (b Buffer) raw() string {
+	return b.lines.join('\n')
+}
+
+fn (b Buffer) view(from int, to int) View {
+	l := b.cur_line()
+	mut x := 0
+	for i := 0; i < b.cursor.pos_x && i < l.len; i++ {
+		if l[i] == `\t` {
+			x += b.tab_width
+			continue
+		}
+		x++
+	}
+	mut lines := []string{}
+	for i, line in b.lines {
+		if i >= from && i <= to {
+			lines << line
+		}
+	}
+	raw := lines.join('\n')
+	return View{
+		raw: raw.replace('\t', strings.repeat(` `, b.tab_width))
+		cursor: Cursor{
+			pos_x: x
+			pos_y: b.cursor.pos_y
+		}
+	}
+}
+
+fn (b Buffer) line(i int) string {
+	if i < 0 || i >= b.lines.len {
+		return ''
+	}
+	return b.lines[i]
+}
+
+fn (b Buffer) cur_line() string {
+	return b.line(b.cursor.pos_y)
+}
+
+fn (b Buffer) cursor_index() int {
+	mut i := 0
+	for y, line in b.lines {
+		if b.cursor.pos_y == y {
+			i += b.cursor.pos_x
+			break
+		}
+		i += line.len + 1
+	}
+	return i
+}
+
+fn (mut b Buffer) put(s string) {
+	has_line_ending := s.contains('\n')
+	x, y := b.cursor.xy()
+	if b.lines.len == 0 {
+		b.lines.prepend('')
+	}
+	line := b.lines[y]
+	l, r := line[..x], line[x..]
+	if has_line_ending {
+		mut lines := s.split('\n')
+		lines[0] = l + lines[0]
+		lines[lines.len - 1] += r
+		b.lines.delete(y)
+		b.lines.insert(y, lines)
+		last := lines[lines.len - 1]
+		b.cursor.set(last.len, y + lines.len - 1)
+		if s == '\n' {
+			b.cursor.set(0, b.cursor.pos_y)
+		}
+	} else {
+		b.lines[y] = l + s + r
+		b.cursor.set(x + s.len, y)
+	}
+	$if debug {
+		flat := s.replace('\n', r'\n')
+		eprintln(@MOD + '.' + @STRUCT + '::' + @FN + ' "$flat"')
+	}
+}
+
+fn (mut b Buffer) del(amount int) string {
+	if amount == 0 {
+		return ''
+	}
+	x, y := b.cursor.xy()
+	if amount < 0 { // don't delete left if we're at 0,0
+		if x == 0 && y == 0 {
+			return ''
+		}
+	} else if x >= b.cur_line().len && y >= b.lines.len - 1 {
+		return ''
+	}
+	mut removed := ''
+	if amount < 0 { // backspace (backward)
+		i := b.cursor_index()
+		removed = b.raw()[i + amount..i]
+		mut left := amount * -1
+		for li := y; li >= 0 && left > 0; li-- {
+			ln := b.lines[li]
+			if left > ln.len {
+				b.lines.delete(li)
+				if ln.len == 0 { // line break delimiter
+					left--
+					if y == 0 {
+						return ''
+					}
+					line_above := b.lines[li - 1]
+					b.cursor.pos_x = line_above.len
+				} else {
+					left -= ln.len
+				}
+				b.cursor.pos_y--
+			} else {
+				if x == 0 {
+					if y == 0 {
+						return ''
+					}
+					line_above := b.lines[li - 1]
+					if ln.len == 0 { // at line break
+						b.lines.delete(li)
+						b.cursor.pos_y--
+						b.cursor.pos_x = line_above.len
+					} else {
+						b.lines[li - 1] = line_above + ln
+						b.lines.delete(li)
+						b.cursor.pos_y--
+						b.cursor.pos_x = line_above.len
+					}
+				} else if x == 1 {
+					b.lines[li] = b.lines[li][left..]
+					b.cursor.pos_x = 0
+				} else {
+					b.lines[li] = ln[..x - left] + ln[x..]
+					b.cursor.pos_x -= left
+				}
+				left = 0
+				break
+			}
+		}
+	} else { // delete (forward)
+		i := b.cursor_index() + 1
+		removed = b.raw()[i - amount..i]
+		mut left := amount
+		for li := y; li >= 0 && left > 0; li++ {
+			ln := b.lines[li]
+			if x == ln.len { // at line end
+				if y + 1 <= b.lines.len {
+					b.lines[li] = ln + b.lines[y + 1]
+					b.lines.delete(y + 1)
+					left--
+					b.del(left)
+				}
+			} else if left > ln.len {
+				b.lines.delete(li)
+				left -= ln.len
+			} else {
+				b.lines[li] = ln[..x] + ln[x + left..]
+				left = 0
+			}
+		}
+	}
+	$if debug {
+		flat := removed.replace('\n', r'\n')
+		eprintln(@MOD + '.' + @STRUCT + '::' + @FN + ' "$flat"')
+	}
+	return removed
+}
+
+fn (mut b Buffer) free() {
+	$if debug {
+		eprintln(@MOD + '.' + @STRUCT + '::' + @FN)
+	}
+	for line in b.lines {
+		unsafe { line.free() }
+	}
+	unsafe { b.lines.free() }
+}
+
+fn (mut b Buffer) move_updown(amount int) {
+	b.cursor.move(0, amount)
+	// Check the move
+	line := b.cur_line()
+	if b.cursor.pos_x > line.len {
+		b.cursor.set(line.len, b.cursor.pos_y)
+	}
+}
+
+// move_cursor will navigate the cursor within the buffer bounds
+fn (mut b Buffer) move_cursor(amount int, movement Movement) {
+	cur_line := b.cur_line()
+	match movement {
+		.up {
+			if b.cursor.pos_y - amount >= 0 {
+				b.move_updown(-amount)
+			}
+		}
+		.down {
+			if b.cursor.pos_y + amount < b.lines.len {
+				b.move_updown(amount)
+			}
+		}
+		.page_up {
+			dlines := mu.min(b.cursor.pos_y, amount)
+			b.move_updown(-dlines)
+		}
+		.page_down {
+			dlines := mu.min(b.lines.len - 1, b.cursor.pos_y + amount) - b.cursor.pos_y
+			b.move_updown(dlines)
+		}
+		.left {
+			if b.cursor.pos_x - amount >= 0 {
+				b.cursor.move(-amount, 0)
+			} else if b.cursor.pos_y > 0 {
+				b.cursor.set(b.line(b.cursor.pos_y - 1).len, b.cursor.pos_y - 1)
+			}
+		}
+		.right {
+			if b.cursor.pos_x + amount <= cur_line.len {
+				b.cursor.move(amount, 0)
+			} else if b.cursor.pos_y + 1 < b.lines.len {
+				b.cursor.set(0, b.cursor.pos_y + 1)
+			}
+		}
+		.home {
+			b.cursor.set(0, b.cursor.pos_y)
+		}
+		.end {
+			b.cursor.set(cur_line.len, b.cursor.pos_y)
+		}
+	}
+}
+
+fn (mut b Buffer) move_to_word(movement Movement) {
+	a := if movement == .left { -1 } else { 1 }
+	mut line := b.cur_line()
+	mut x, mut y := b.cursor.pos_x, b.cursor.pos_y
+	if x + a < 0 && y > 0 {
+		y--
+		line = b.line(b.cursor.pos_y - 1)
+		x = line.len
+	} else if x + a >= line.len && y + 1 < b.lines.len {
+		y++
+		line = b.line(b.cursor.pos_y + 1)
+		x = 0
+	}
+	// first, move past all non-`a-zA-Z0-9_` characters
+	for x + a >= 0 && x + a < line.len && !(line[x + a].is_letter()
+		|| line[x + a].is_digit() || line[x + a] == `_`) {
+		x += a
+	}
+	// then, move past all the letters and numbers
+	for x + a >= 0 && x + a < line.len && (line[x + a].is_letter()
+		|| line[x + a].is_digit() || line[x + a] == `_`) {
+		x += a
+	}
+	// if the cursor is out of bounds, move it to the next/previous line
+	if x + a >= 0 && x + a <= line.len {
+		x += a
+	} else if a < 0 && y + 1 > b.lines.len && y - 1 >= 0 {
+		y += a
+		x = 0
+	}
+	b.cursor.set(x, y)
+}
+
+struct Cursor {
+pub mut:
+	pos_x int
+	pos_y int
+}
+
+fn (mut c Cursor) set(x int, y int) {
+	c.pos_x = x
+	c.pos_y = y
+}
+
+fn (mut c Cursor) move(x int, y int) {
+	c.pos_x += x
+	c.pos_y += y
+}
+
+fn (c Cursor) xy() (int, int) {
+	return c.pos_x, c.pos_y
+}
+
+// App callbacks
+fn init(x voidptr) {
+	mut a := &App(x)
+	a.init_file()
+}
+
+fn (mut a App) init_file() {
+	a.ed = &Buffer{}
+	mut init_y := 0
+	mut init_x := 0
+	if a.files.len > 0 && a.current_file < a.files.len && a.files[a.current_file].len > 0 {
+		if !os.is_file(a.files[a.current_file]) && a.files[a.current_file].contains(':') {
+			// support the file:line:col: format
+			fparts := a.files[a.current_file].split(':')
+			if fparts.len > 0 {
+				a.files[a.current_file] = fparts[0]
+			}
+			if fparts.len > 1 {
+				init_y = fparts[1].int() - 1
+			}
+			if fparts.len > 2 {
+				init_x = fparts[2].int() - 1
+			}
+		}
+		if os.is_file(a.files[a.current_file]) {
+			// 'vico: ' +
+			a.tui.set_window_title(a.files[a.current_file])
+			mut b := a.ed
+			content := os.read_file(a.files[a.current_file]) or { panic(err) }
+			b.put(content)
+			a.ed.cursor.pos_x = init_x
+			a.ed.cursor.pos_y = init_y
+		}
+	}
+}
+
+fn (a &App) view_height() int {
+	return a.tui.window_height - a.footer_height - 1
+}
+
+// magnet_cursor_x will place the cursor as close to it's last move left or right as possible
+fn (mut a App) magnet_cursor_x() {
+	mut buffer := a.ed
+	if buffer.cursor.pos_x < a.magnet_x {
+		if a.magnet_x < buffer.cur_line().len {
+			move_x := a.magnet_x - buffer.cursor.pos_x
+			buffer.move_cursor(move_x, .right)
+		}
+	}
+}
+
+fn frame(x voidptr) {
+	mut a := &App(x)
+	mut ed := a.ed
+	a.tui.clear()
+	scroll_limit := a.view_height()
+	// scroll down
+	if ed.cursor.pos_y > a.viewport + scroll_limit { // scroll down
+		a.viewport = ed.cursor.pos_y - scroll_limit
+	} else if ed.cursor.pos_y < a.viewport { // scroll up
+		a.viewport = ed.cursor.pos_y
+	}
+	view := ed.view(a.viewport, scroll_limit + a.viewport)
+	a.tui.draw_text(0, 0, view.raw)
+	a.footer()
+	a.tui.set_cursor_position(view.cursor.pos_x + 1, ed.cursor.pos_y + 1 - a.viewport)
+	a.tui.flush()
+}
+
+fn event(e &tui.Event, x voidptr) {
+	mut a := &App(x)
+	mut buffer := a.ed
+	if e.typ == .key_down {
+		match e.code {
+			.escape {
+				exit(0)
+			}
+			.enter {
+				buffer.put('\n')
+			}
+			.backspace {
+				buffer.del(-1)
+			}
+			.delete {
+				buffer.del(1)
+			}
+			.left {
+				if e.modifiers == .ctrl {
+					buffer.move_to_word(.left)
+				} else if e.modifiers.is_empty() {
+					buffer.move_cursor(1, .left)
+				}
+				a.magnet_x = buffer.cursor.pos_x
+			}
+			.right {
+				if e.modifiers == .ctrl {
+					buffer.move_to_word(.right)
+				} else if e.modifiers.is_empty() {
+					buffer.move_cursor(1, .right)
+				}
+				a.magnet_x = buffer.cursor.pos_x
+			}
+			.up {
+				buffer.move_cursor(1, .up)
+				a.magnet_cursor_x()
+			}
+			.down {
+				buffer.move_cursor(1, .down)
+				a.magnet_cursor_x()
+			}
+			.page_up {
+				buffer.move_cursor(a.view_height(), .page_up)
+			}
+			.page_down {
+				buffer.move_cursor(a.view_height(), .page_down)
+			}
+			.home {
+				buffer.move_cursor(1, .home)
+			}
+			.end {
+				buffer.move_cursor(1, .end)
+			}
+			48...57, 97...122 { // 0-9a-zA-Z
+				if e.modifiers == .ctrl {
+					if e.code == .s {
+						a.save()
+					}
+				} else if !(e.modifiers.has(.ctrl | .alt) || e.code == .null) {
+					buffer.put(e.ascii.ascii_str())
+				}
+			}
+			else {
+				if e.modifiers == .alt {
+					if e.code == .comma {
+						a.visit_prev_file()
+						return
+					}
+					if e.code == .period {
+						a.visit_next_file()
+						return
+					}
+				}
+				buffer.put(e.utf8.bytes().bytestr())
+			}
+		}
+	} else if e.typ == .mouse_scroll {
+		direction := if e.direction == .up { Movement.down } else { Movement.up }
+		buffer.move_cursor(1, direction)
+	}
+}
+
+fn main() {
+	mut files := []string{}
+	if os.args.len > 1 {
+		files << os.args[1..]
+	}
+	mut a := &App{
+		files: files
+	}
+	a.tui = tui.init(
+		user_data: a
+		init_fn: init
+		frame_fn: frame
+		event_fn: event
+		capture_events: true
+	)
+	a.tui.run() ?
+}
-- 
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