mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
445 lines
8.6 KiB
V
445 lines
8.6 KiB
V
// Copyright (c) 2020 Lars Pontoppidan. All rights reserved.
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// Use of this source code is governed by the MIT license distributed with this software.
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// Don't use this editor for any serious work.
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// A lot of funtionality is missing compared to your favourite editor :)
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import strings
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import os
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import term.ui
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enum Movement {
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up
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down
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left
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right
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home
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end
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}
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struct View {
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pub:
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raw string
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cursor Cursor
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}
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struct App {
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mut:
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tui &ui.Context = 0
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ed &Buffer = 0
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file string
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status string
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t int
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footer_height int = 2
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}
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fn (mut a App) set_status(msg string, duration_ms int) {
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a.status = msg
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a.t = duration_ms
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}
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fn (mut a App) save() {
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if a.file.len > 0 {
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b := a.ed
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os.write_file(a.file, b.raw())
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a.set_status('Saved', 2000)
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} else {
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a.set_status('No file loaded', 4000)
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}
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}
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fn (mut a App) footer() {
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w, h := a.tui.window_width, a.tui.window_height
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mut b := a.ed
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flat := b.flat()
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snip := if flat.len > 19 { flat[..20] } else { flat }
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mut finfo := ''
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if a.file.len > 0 {
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finfo = ' (' + os.file_name(a.file) + ')'
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}
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mut status := a.status
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if a.t <= 0 {
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status = ''
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}
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line := '─'.repeat(w) + '\n'
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footer := line + '$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: ${b.cursor_index():5} (ESC = quit, Ctrl+s = save) Raw: "$snip" $status'
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a.tui.draw_text(0, h - 1, footer)
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a.t -= 33
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if a.t < 0 {
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a.t = 0
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}
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}
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struct Buffer {
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tab_width int = 4
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pub mut:
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lines []string
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cursor Cursor
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}
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fn (b Buffer) flat() string {
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return b.raw().replace_each(['\n', r'\n', '\t', r'\t'])
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}
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fn (b Buffer) raw() string {
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return b.lines.join('\n')
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}
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fn (b Buffer) view(from int, to int) View {
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l := b.cur_line()
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mut x := 0
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for i := 0; i < b.cursor.pos_x && i < l.len; i++ {
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if l[i] == `\t` {
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x += b.tab_width
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continue
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}
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x++
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}
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mut lines := []string{}
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for i, line in b.lines {
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if i >= from && i <= to {
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lines << line
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}
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}
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raw := lines.join('\n')
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return {
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raw: raw.replace('\t', strings.repeat(` `, b.tab_width))
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cursor: {
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pos_x: x
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pos_y: b.cursor.pos_y
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}
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}
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}
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fn (b Buffer) cur_line() string {
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_, y := b.cursor.xy()
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if b.lines.len == 0 {
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return ''
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}
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return b.lines[y]
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}
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fn (b Buffer) cursor_index() int {
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mut i := 0
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for y, line in b.lines {
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if b.cursor.pos_y == y {
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i += b.cursor.pos_x
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break
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}
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i += line.len + 1
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}
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return i
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}
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fn (mut b Buffer) put(s string) {
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has_line_ending := s.contains('\n')
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x, y := b.cursor.xy()
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if b.lines.len == 0 {
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b.lines.prepend('')
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}
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line := b.lines[y]
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l, r := line[..x], line[x..]
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if has_line_ending {
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mut lines := s.split('\n')
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lines[0] = l + lines[0]
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lines[lines.len - 1] += r
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b.lines.delete(y)
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b.lines.insert(y, lines)
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last := lines[lines.len - 1]
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b.cursor.set(last.len, y + lines.len - 1)
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if s == '\n' {
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b.cursor.set(0, b.cursor.pos_y)
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}
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} else {
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b.lines[y] = l + s + r
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b.cursor.set(x + s.len, y)
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}
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$if debug {
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flat := s.replace('\n', r'\n')
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eprintln(@MOD + '.' + @STRUCT + '::' + @FN + ' "$flat"')
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}
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}
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fn (mut b Buffer) del(amount int) string {
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if amount == 0 {
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return ''
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}
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x, y := b.cursor.xy()
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if amount < 0 { // don't delete left if we're at 0,0
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if x == 0 && y == 0 {
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return ''
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}
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} else if x >= b.cur_line().len && y >= b.lines.len - 1 {
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return ''
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}
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mut removed := ''
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if amount < 0 { // backspace (backward)
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i := b.cursor_index()
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removed = b.raw()[i + amount..i]
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mut left := amount * -1
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for li := y; li >= 0 && left > 0; li-- {
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ln := b.lines[li]
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if left > ln.len {
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b.lines.delete(li)
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if ln.len == 0 { // line break delimiter
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left--
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if y == 0 {
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return ''
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}
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line_above := b.lines[li - 1]
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b.cursor.pos_x = line_above.len
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} else {
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left -= ln.len
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}
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b.cursor.pos_y--
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} else {
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if x == 0 {
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if y == 0 {
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return ''
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}
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line_above := b.lines[li - 1]
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if ln.len == 0 { // at line break
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b.lines.delete(li)
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b.cursor.pos_y--
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b.cursor.pos_x = line_above.len
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} else {
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b.lines[li - 1] = line_above + ln
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b.lines.delete(li)
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b.cursor.pos_y--
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b.cursor.pos_x = line_above.len
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}
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} else if x == 1 {
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b.lines[li] = b.lines[li][left..]
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b.cursor.pos_x = 0
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} else {
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b.lines[li] = ln[..x - left] + ln[x..]
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b.cursor.pos_x -= left
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}
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left = 0
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break
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}
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}
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} else { // delete (forward)
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i := b.cursor_index() + 1
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removed = b.raw()[i - amount..i]
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mut left := amount
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for li := y; li >= 0 && left > 0; li++ {
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ln := b.lines[li]
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if x == ln.len { // at line end
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if y + 1 <= b.lines.len {
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b.lines[li] = ln + b.lines[y + 1]
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b.lines.delete(y + 1)
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left--
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b.del(left)
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}
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} else if left > ln.len {
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b.lines.delete(li)
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left -= ln.len
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} else {
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b.lines[li] = ln[..x] + ln[x + left..]
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left = 0
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}
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}
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}
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$if debug {
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flat := removed.replace('\n', r'\n')
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eprintln(@MOD + '.' + @STRUCT + '::' + @FN + ' "$flat"')
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}
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return removed
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}
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fn (mut b Buffer) free() {
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$if debug {
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eprintln(@MOD + '.' + @STRUCT + '::' + @FN)
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}
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for line in b.lines {
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line.free()
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}
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unsafe {b.lines.free()}
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}
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// move_cursor will navigate the cursor within the buffer bounds
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fn (mut b Buffer) move_cursor(amount int, movement Movement) {
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cur_line := b.cur_line()
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match movement {
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.up {
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if b.cursor.pos_y - amount >= 0 {
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b.cursor.move(0, -amount)
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// Check the move
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line := b.cur_line()
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if b.cursor.pos_x > line.len {
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b.cursor.set(line.len, b.cursor.pos_y)
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}
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}
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}
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.down {
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if b.cursor.pos_y + amount < b.lines.len {
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b.cursor.move(0, amount)
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// Check the move
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line := b.cur_line()
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if b.cursor.pos_x > line.len {
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b.cursor.set(line.len, b.cursor.pos_y)
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}
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}
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}
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.left {
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if b.cursor.pos_x - amount >= 0 {
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b.cursor.move(-amount, 0)
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}
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}
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.right {
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if b.cursor.pos_x + amount <= cur_line.len {
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b.cursor.move(amount, 0)
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}
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}
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.home {
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b.cursor.set(0, b.cursor.pos_y)
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}
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.end {
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b.cursor.set(cur_line.len, b.cursor.pos_y)
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}
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}
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}
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struct Cursor {
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pub mut:
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pos_x int
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pos_y int
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}
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fn (mut c Cursor) set(x int, y int) {
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c.pos_x = x
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c.pos_y = y
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}
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fn (mut c Cursor) move(x int, y int) {
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c.pos_x += x
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c.pos_y += y
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}
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fn (c Cursor) xy() (int, int) {
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return c.pos_x, c.pos_y
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}
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// App callbacks
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fn init(x voidptr) {
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mut app := &App(x)
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app.ed = &Buffer{}
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mut init_y := 0
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mut init_x := 0
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if app.file.len > 0 {
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if !os.is_file(app.file) && app.file.contains(':') {
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// support the file:line:col: format
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fparts := app.file.split(':')
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if fparts.len > 0 {
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app.file = fparts[0]
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}
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if fparts.len > 1 {
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init_y = fparts[1].int() - 1
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}
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if fparts.len > 2 {
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init_x = fparts[2].int() - 1
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}
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}
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if os.is_file(app.file) {
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mut b := app.ed
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content := os.read_file(app.file) or {
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panic(err)
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}
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b.put(content)
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app.ed.cursor.pos_x = init_x
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app.ed.cursor.pos_y = init_y
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}
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}
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}
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fn frame(x voidptr) {
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mut app := &App(x)
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mut ed := app.ed
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app.tui.clear()
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scroll_limit := app.tui.window_height-app.footer_height-1
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mut view := View{}
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if ed.cursor.pos_y > scroll_limit { // Scroll
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view = ed.view(ed.cursor.pos_y-scroll_limit, ed.cursor.pos_y)
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} else {
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view = ed.view(0, scroll_limit)
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}
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app.tui.draw_text(0, 0, view.raw)
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app.footer()
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if ed.cursor.pos_y > scroll_limit {
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app.tui.set_cursor_position(view.cursor.pos_x + 1, scroll_limit+1)
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} else {
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app.tui.set_cursor_position(view.cursor.pos_x + 1, view.cursor.pos_y + 1)
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}
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app.tui.flush()
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}
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fn event(e &ui.Event, x voidptr) {
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mut app := &App(x)
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mut buffer := app.ed
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if e.typ == .key_down {
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match e.code {
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.escape {
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app.tui.set_cursor_position(0, 0)
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app.tui.flush()
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exit(0)
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}
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.backspace {
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buffer.del(-1)
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}
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.delete {
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buffer.del(1)
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}
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.left {
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buffer.move_cursor(1, .left)
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}
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.right {
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buffer.move_cursor(1, .right)
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}
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.up {
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buffer.move_cursor(1, .up)
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}
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.down {
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buffer.move_cursor(1, .down)
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}
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.home {
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buffer.move_cursor(1, .home)
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}
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.end {
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buffer.move_cursor(1, .end)
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}
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48...57, 97...122 { // 0-9a-zA-Z
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if e.modifiers == ui.ctrl {
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if e.code == .s {
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app.save()
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}
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} else if e.modifiers in [ui.shift, 0] {
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buffer.put(e.ascii.str())
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}
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}
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else {
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buffer.put(e.utf8.bytes().bytestr())
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}
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}
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} else if e.typ == .mouse_scroll {
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direction := if e.direction == .up { Movement.down } else { Movement.up }
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buffer.move_cursor(1, direction)
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}
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}
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// main
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mut file := ''
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if os.args.len > 1 {
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file = os.args[1]
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}
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mut app := &App{
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file: file
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}
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app.tui = ui.init({
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user_data: app
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init_fn: init
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frame_fn: frame
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event_fn: event
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capture_events: true
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frame_rate: 30
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})
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app.tui.run()
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