examples/text_editor: minor cleanup and simplifications (#6818)

pull/6821/head
spaceface777 2020-11-13 18:18:05 +01:00 committed by GitHub
parent b02f03e20a
commit eacd6b5d54
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1 changed files with 104 additions and 134 deletions

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@ -4,33 +4,8 @@
// A lot of funtionality is missing compared to your favourite editor :)
import strings
import os
import term
import term.ui
type InputType = byte | rune | string
fn (ipt InputType) len() int {
match ipt {
byte, rune {
return 1
}
string {
return it.len
}
}
}
fn (ipt InputType) str() string {
match ipt {
byte, rune {
return ipt.str()
}
string {
return ipt.str()
}
}
}
enum Movement {
up
down
@ -48,11 +23,12 @@ pub:
struct App {
mut:
ti &ui.Context = 0
tui &ui.Context = 0
ed &Buffer = 0
file string
status string
t int
footer_height int = 2
}
fn (mut a App) set_status(msg string, duration_ms int) {
@ -64,18 +40,14 @@ fn (mut a App) save() {
if a.file.len > 0 {
b := a.ed
os.write_file(a.file, b.raw())
a.set_status('saved', 2000)
a.set_status('Saved', 2000)
} else {
a.set_status('No file loaded', 4000)
}
}
fn (mut a App) footer() {
w, h := term.get_terminal_size()
term.set_cursor_position({
x: 0
y: h - 1
})
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 }
@ -88,10 +60,8 @@ fn (mut a App) footer() {
status = ''
}
line := ''.repeat(w) + '\n'
footer := line + '$finfo Line ${b.cursor.pos.y + 1}/$b.lines.len, Column ${b.cursor.pos.x +
1}/$b.cur_line().len index: $b.cursor_index() (ESC = quit, Ctrl+s = save) Raw: "$snip" $status'
print(footer)
flush()
footer := line + '$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'
a.tui.draw_text(0, h - 1, footer)
a.t -= 33
if a.t < 0 {
a.t = 0
@ -99,7 +69,6 @@ fn (mut a App) footer() {
}
struct Buffer {
line_break string = '\n'
tab_width int = 4
pub mut:
lines []string
@ -107,31 +76,35 @@ pub mut:
}
fn (b Buffer) flat() string {
return b.raw().replace(b.line_break, r'\n').replace('\t', r'\t')
return b.raw().replace_each(['\n', r'\n', '\t', r'\t'])
}
fn (b Buffer) raw() string {
return b.lines.join(b.line_break)
return b.lines.join('\n')
}
fn (b Buffer) view() View {
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++ {
for i := 0; i < b.cursor.pos_x && i < l.len; i++ {
if l[i] == `\t` {
x += b.tab_width
continue
}
x++
}
p := CursorPosition{
y: b.cursor.pos.y
x: x
mut lines := []string{}
for i, line in b.lines {
if i >= from && i <= to {
lines << line
}
}
return View{
raw: b.raw().replace('\t', strings.repeat(` `, b.tab_width))
cursor: Cursor{
pos: p
raw := lines.join('\n')
return {
raw: raw.replace('\t', strings.repeat(` `, b.tab_width))
cursor: {
pos_x: x
pos_y: b.cursor.pos_y
}
}
}
@ -147,8 +120,8 @@ fn (b Buffer) cur_line() string {
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
if b.cursor.pos_y == y {
i += b.cursor.pos_x
break
}
i += line.len + 1
@ -156,33 +129,31 @@ fn (b Buffer) cursor_index() int {
return i
}
fn (mut b Buffer) put(ipt InputType) {
s := ipt.str()
has_line_ending := s.contains(b.line_break)
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 := line[..x]
r := line[x..]
l, r := line[..x], line[x..]
if has_line_ending {
mut lines := s.split(b.line_break)
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 == b.line_break {
b.cursor.set(0, b.cursor.pos.y)
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)
}
$if debug {
flat := s.replace(b.line_break, r'\n')
flat := s.replace('\n', r'\n')
eprintln(@MOD + '.' + @STRUCT + '::' + @FN + ' "$flat"')
}
}
@ -196,10 +167,8 @@ fn (mut b Buffer) del(amount int) string {
if x == 0 && y == 0 {
return ''
}
} else {
if x >= b.cur_line().len && y >= b.lines.len - 1 {
return ''
}
} else if x >= b.cur_line().len && y >= b.lines.len - 1 {
return ''
}
mut removed := ''
if amount < 0 { // backspace (backward)
@ -216,11 +185,11 @@ fn (mut b Buffer) del(amount int) string {
return ''
}
line_above := b.lines[li - 1]
b.cursor.pos.x = line_above.len
b.cursor.pos_x = line_above.len
} else {
left -= ln.len
}
b.cursor.pos.y--
b.cursor.pos_y--
} else {
if x == 0 {
if y == 0 {
@ -229,20 +198,20 @@ fn (mut b Buffer) del(amount int) string {
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
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
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
b.cursor.pos_x = 0
} else {
b.lines[li] = ln[..x - left] + ln[x..]
b.cursor.pos.x -= left
b.cursor.pos_x -= left
}
left = 0
break
@ -271,7 +240,7 @@ fn (mut b Buffer) del(amount int) string {
}
}
$if debug {
flat := removed.replace(b.line_break, r'\n')
flat := removed.replace('\n', r'\n')
eprintln(@MOD + '.' + @STRUCT + '::' + @FN + ' "$flat"')
}
return removed
@ -289,85 +258,95 @@ fn (mut b Buffer) free() {
// move_cursor will navigate the cursor within the buffer bounds
fn (mut b Buffer) move_cursor(amount int, movement Movement) {
pos := b.cursor.pos
cur_line := b.cur_line()
match movement {
.up {
if pos.y - amount >= 0 {
if b.cursor.pos_y - amount >= 0 {
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)
if b.cursor.pos_x > line.len {
b.cursor.set(line.len, b.cursor.pos_y)
}
}
}
.down {
if pos.y + amount < b.lines.len {
if b.cursor.pos_y + amount < b.lines.len {
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)
if b.cursor.pos_x > line.len {
b.cursor.set(line.len, b.cursor.pos_y)
}
}
}
.left {
if pos.x - amount >= 0 {
if b.cursor.pos_x - amount >= 0 {
b.cursor.move(-amount, 0)
}
}
.right {
if pos.x + amount <= cur_line.len {
if b.cursor.pos_x + amount <= cur_line.len {
b.cursor.move(amount, 0)
}
}
.home {
b.cursor.set(0, b.cursor.pos.y)
b.cursor.set(0, b.cursor.pos_y)
}
.end {
b.cursor.set(cur_line.len, b.cursor.pos.y)
b.cursor.set(cur_line.len, b.cursor.pos_y)
}
}
}
// Cursor related
struct CursorPosition {
pub mut:
x int
y int
}
struct Cursor {
pub mut:
pos CursorPosition
pos_x int
pos_y int
}
fn (mut c Cursor) set(x int, y int) {
c.pos.x = x
c.pos.y = y
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
c.pos_x += x
c.pos_y += y
}
fn (c Cursor) xy() (int, int) {
return c.pos.x, c.pos.y
return c.pos_x, c.pos_y
}
// App callbacks
fn init(x voidptr) {
mut app := &App(x)
app.ed = &Buffer{}
mut init_y := 0
mut init_x := 0
if app.file.len > 0 {
if !os.is_file(app.file) && app.file.contains(':') {
// support the file:line:col: format
fparts := app.file.split(':')
if fparts.len > 0 {
app.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(app.file) {
mut b := app.ed
content := os.read_file(app.file) or {
panic(err)
}
b.put(content)
app.ed.cursor.pos_x = init_x
app.ed.cursor.pos_y = init_y
}
}
}
@ -375,29 +354,22 @@ fn init(x voidptr) {
fn frame(x voidptr) {
mut app := &App(x)
mut ed := app.ed
term.erase_clear()
term.erase_del_clear()
term.set_cursor_position({
x: 0
y: 0
})
view := ed.view()
print('$view.raw')
flush()
app.tui.clear()
scroll_limit := app.tui.window_height-app.footer_height-1
mut view := View{}
if ed.cursor.pos_y > scroll_limit { // Scroll
view = ed.view(ed.cursor.pos_y-scroll_limit, ed.cursor.pos_y)
} else {
view = ed.view(0, scroll_limit)
}
app.tui.draw_text(0, 0, view.raw)
app.footer()
term.set_cursor_position({
x: view.cursor.pos.x + 1
y: view.cursor.pos.y + 1
})
}
fn cleanup(x voidptr) {
mut app := &App(x)
app.ed.free()
}
fn fail(error string) {
eprintln(error)
if ed.cursor.pos_y > scroll_limit {
app.tui.set_cursor_position(view.cursor.pos_x + 1, scroll_limit+1)
} else {
app.tui.set_cursor_position(view.cursor.pos_x + 1, view.cursor.pos_y + 1)
}
app.tui.flush()
}
fn event(e &ui.Event, x voidptr) {
@ -406,10 +378,8 @@ fn event(e &ui.Event, x voidptr) {
if e.typ == .key_down {
match e.code {
.escape {
term.set_cursor_position({
x: 0
y: 0
})
app.tui.set_cursor_position(0, 0)
app.tui.flush()
exit(0)
}
.backspace {
@ -436,20 +406,22 @@ fn event(e &ui.Event, x voidptr) {
.end {
buffer.move_cursor(1, .end)
}
48...57 { // 0 - 9
buffer.put(e.ascii)
}
97...122 { // a-zA-Z
if e.modifiers == ui.ctrl && e.code == .s {
app.save()
} else {
buffer.put(e.ascii)
48...57, 97...122 { // 0-9a-zA-Z
if e.modifiers == ui.ctrl {
if e.code == .s {
app.save()
}
} else if e.modifiers in [ui.shift, 0] {
buffer.put(e.ascii.str())
}
}
else {
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)
}
}
@ -461,14 +433,12 @@ if os.args.len > 1 {
mut app := &App{
file: file
}
app.ti = ui.init({
app.tui = ui.init({
user_data: app
init_fn: init
frame_fn: frame
cleanup_fn: cleanup
event_fn: event
fail_fn: fail
capture_events: true
frame_rate: 30
})
app.ti.run()
app.tui.run()