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v/vlib/term/ui/termios_nix.c.v

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// Copyright (c) 2020-2021 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module ui
import os
import time
#include <termios.h>
#include <sys/ioctl.h>
#include <signal.h>
fn C.tcgetattr()
fn C.tcsetattr()
fn C.ioctl(fd int, request u64, arg voidptr) int
struct C.termios {
mut:
c_iflag u32
c_lflag u32
c_cc [32]byte
}
struct C.winsize {
ws_row u16
ws_col u16
}
const (
termios_at_startup = get_termios()
)
[inline]
fn get_termios() C.termios {
mut t := C.termios{}
C.tcgetattr(C.STDIN_FILENO, &t)
return t
}
[inline]
fn get_terminal_size() (u16, u16) {
winsz := C.winsize{}
C.ioctl(0, C.TIOCGWINSZ, &winsz)
return winsz.ws_row, winsz.ws_col
}
fn restore_terminal_state() {
termios_reset()
mut c := ctx_ptr
if c != 0 {
c.paused = true
load_title()
}
os.flush()
}
fn (mut ctx Context) termios_setup() ? {
// store the current title, so restore_terminal_state can get it back
save_title()
if !ctx.cfg.skip_init_checks && !(is_atty(C.STDIN_FILENO) != 0 && is_atty(C.STDOUT_FILENO) != 0) {
return error('not running under a TTY')
}
mut termios := get_termios()
if ctx.cfg.capture_events {
// Set raw input mode by unsetting ICANON and ECHO,
// as well as disable e.g. ctrl+c and ctrl.z
termios.c_iflag &= ~u32(C.IGNBRK | C.BRKINT | C.PARMRK | C.IXON)
termios.c_lflag &= ~u32(C.ICANON | C.ISIG | C.ECHO | C.IEXTEN | C.TOSTOP)
} else {
// Set raw input mode by unsetting ICANON and ECHO
termios.c_lflag &= ~u32(C.ICANON | C.ECHO)
}
if ctx.cfg.hide_cursor {
print('\x1b[?25l')
}
if ctx.cfg.window_title != '' {
print('\x1b]0;$ctx.cfg.window_title\x07')
}
if !ctx.cfg.skip_init_checks {
// prevent blocking during the feature detections, but allow enough time for the terminal
// to send back the relevant input data
termios.c_cc[C.VTIME] = 1
termios.c_cc[C.VMIN] = 0
C.tcsetattr(C.STDIN_FILENO, C.TCSAFLUSH, &termios)
// feature-test the SU spec
sx, sy := get_cursor_position()
print('$bsu$esu')
ex, ey := get_cursor_position()
if sx == ex && sy == ey {
// the terminal either ignored or handled the sequence properly, enable SU
ctx.enable_su = true
} else {
ctx.draw_line(sx, sy, ex, ey)
ctx.set_cursor_position(sx, sy)
ctx.flush()
}
// feature-test rgb (truecolor) support
ctx.enable_rgb = supports_truecolor()
}
// Prevent stdin from blocking by making its read time 0
termios.c_cc[C.VTIME] = 0
termios.c_cc[C.VMIN] = 0
C.tcsetattr(C.STDIN_FILENO, C.TCSAFLUSH, &termios)
// enable mouse input
print('\x1b[?1003h\x1b[?1006h')
if ctx.cfg.use_alternate_buffer {
// switch to the alternate buffer
print('\x1b[?1049h')
// clear the terminal and set the cursor to the origin
print('\x1b[2J\x1b[3J\x1b[1;1H')
}
ctx.window_height, ctx.window_width = get_terminal_size()
// Reset console on exit
C.atexit(restore_terminal_state)
os.signal(C.SIGTSTP, restore_terminal_state)
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os.signal(C.SIGCONT, fn () {
mut c := ctx_ptr
if c != 0 {
c.termios_setup() or { panic(err) }
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c.window_height, c.window_width = get_terminal_size()
mut event := &Event{
typ: .resized
width: c.window_width
height: c.window_height
}
c.paused = false
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c.event(event)
}
})
for code in ctx.cfg.reset {
os.signal(code, fn () {
mut c := ctx_ptr
if c != 0 {
c.cleanup()
}
exit(0)
})
}
os.signal(C.SIGWINCH, fn () {
mut c := ctx_ptr
if c != 0 {
c.window_height, c.window_width = get_terminal_size()
mut event := &Event{
typ: .resized
width: c.window_width
height: c.window_height
}
c.event(event)
}
})
os.flush()
}
fn get_cursor_position() (int, int) {
print('\033[6n')
buf := malloc(25)
len := C.read(C.STDIN_FILENO, buf, 24)
unsafe {
buf[len] = 0
}
s := tos(buf, len)
a := s[2..].split(';')
if a.len != 2 {
return -1, -1
}
return a[0].int(), a[1].int()
}
fn supports_truecolor() bool {
// faster/simpler, but less reliable, check
if os.getenv('COLORTERM') in ['truecolor', '24bit'] {
return true
}
// set the bg color to some arbirtrary value (#010203), assumed not to be the default
print('\x1b[48:2:1:2:3m')
// andquery the current color
print('\x1bP\$qm\x1b\\')
buf := malloc(25)
len := C.read(C.STDIN_FILENO, buf, 24)
unsafe {
buf[len] = 0
}
s := tos(buf, len)
return '1:2:3' in s
}
fn termios_reset() {
// C.TCSANOW ??
C.tcsetattr(C.STDIN_FILENO, C.TCSAFLUSH, &ui.termios_at_startup)
print('\x1b[?1003l\x1b[?1006l\x1b[?25h')
c := ctx_ptr
if c != 0 && c.cfg.use_alternate_buffer {
print('\x1b[?1049l')
}
os.flush()
}
///////////////////////////////////////////
// TODO: do multiple sleep/read cycles, rather than one big one
fn (mut ctx Context) termios_loop() {
frame_time := 1_000_000 / ctx.cfg.frame_rate
mut init_called := false
mut sw := time.new_stopwatch(auto_start: false)
mut sleep_len := 0
for {
if !init_called {
ctx.init()
init_called = true
}
// println('SLEEPING: $sleep_len')
if sleep_len > 0 {
time.usleep(sleep_len)
}
if !ctx.paused {
sw.restart()
if ctx.cfg.event_fn != voidptr(0) {
unsafe {
len := C.read(C.STDIN_FILENO, byteptr(ctx.read_buf.data) + ctx.read_buf.len,
ctx.read_buf.cap - ctx.read_buf.len)
ctx.resize_arr(ctx.read_buf.len + len)
}
if ctx.read_buf.len > 0 {
ctx.parse_events()
}
}
ctx.frame()
sw.pause()
e := sw.elapsed().microseconds()
sleep_len = frame_time - int(e)
ctx.frame_count++
}
}
}
fn (mut ctx Context) parse_events() {
// Stop this from getting stuck in rare cases where something isn't parsed correctly
mut nr_iters := 0
for ctx.read_buf.len > 0 {
nr_iters++
if nr_iters > 100 {
ctx.shift(1)
}
mut event := &Event(0)
if ctx.read_buf[0] == 0x1b {
e, len := escape_sequence(ctx.read_buf.bytestr())
event = e
ctx.shift(len)
} else {
event = single_char(ctx.read_buf.bytestr())
ctx.shift(1)
}
if event != 0 {
ctx.event(event)
nr_iters = 0
}
}
}
fn single_char(buf string) &Event {
ch := buf[0]
mut event := &Event{
typ: .key_down
ascii: ch
code: KeyCode(ch)
utf8: buf
}
match ch {
// special handling for `ctrl + letter`
// TODO: Fix assoc in V and remove this workaround :/
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// 1 ... 26 { event = Event{ ...event, code: KeyCode(96 | ch), modifiers: ctrl } }
// 65 ... 90 { event = Event{ ...event, code: KeyCode(32 | ch), modifiers: shift } }
// The bit `or`s here are really just `+`'s, just written in this way for a tiny performance improvement
// don't treat tab, enter as ctrl+i, ctrl+j
1...8, 11...26 { event = &Event{
typ: event.typ
ascii: event.ascii
utf8: event.utf8
code: KeyCode(96 | ch)
modifiers: ctrl
} }
65...90 { event = &Event{
typ: event.typ
ascii: event.ascii
utf8: event.utf8
code: KeyCode(32 | ch)
modifiers: shift
} }
else {}
}
return event
}
// Gets an entire, independent escape sequence from the buffer
// Normally, this just means reading until the first letter, but there are some exceptions...
fn escape_end(buf string) int {
mut i := 0
for {
if i + 1 == buf.len {
return buf.len
}
if buf[i].is_letter() || buf[i] == `~` {
if buf[i] == `O` && i + 2 <= buf.len {
n := buf[i + 1]
if (n >= `A` && n <= `D`) || (n >= `P` && n <= `S`) || n == `F` || n == `H` {
return i + 2
}
}
return i + 1
// escape hatch to avoid potential issues/crashes, although ideally this should never eval to true
} else if buf[i + 1] == 0x1b {
return i + 1
}
i++
}
// this point should be unreachable
assert false
return 0
}
fn escape_sequence(buf_ string) (&Event, int) {
end := escape_end(buf_)
single := buf_[..end] // read until the end of the sequence
buf := single[1..] // skip the escape character
if buf.len == 0 {
return &Event{
typ: .key_down
ascii: 27
code: .escape
utf8: single
}, 1
}
if buf.len == 1 {
c := single_char(buf)
return &Event{
typ: c.typ
ascii: c.ascii
code: c.code
utf8: single
modifiers: c.modifiers | alt
}, 2
}
// ----------------
// Mouse events
// ----------------
// Documentation: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-Mouse-Tracking
if buf.len > 2 && buf[1] == `<` {
split := buf[2..].split(';')
if split.len < 3 {
return &Event(0), 0
}
typ, x, y := split[0].int(), split[1].int(), split[2].int()
lo := typ & 0b00011
hi := typ & 0b11100
mut modifiers := u32(0)
if hi & 4 != 0 {
modifiers |= shift
}
if hi & 8 != 0 {
modifiers |= alt
}
if hi & 16 != 0 {
modifiers |= ctrl
}
match typ {
0...31 {
last := buf[buf.len - 1]
button := if lo < 3 { MouseButton(lo + 1) } else { MouseButton.unknown }
event := if last == `m` || lo == 3 {
EventType.mouse_up
} else {
EventType.mouse_down
}
return &Event{
typ: event
x: x
y: y
button: button
modifiers: modifiers
utf8: single
}, end
}
32...63 {
button, event := if lo < 3 {
MouseButton(lo + 1), EventType.mouse_drag
} else {
MouseButton.unknown, EventType.mouse_move
}
return &Event{
typ: event
x: x
y: y
button: button
modifiers: modifiers
utf8: single
}, end
}
64...95 {
direction := if typ & 1 == 0 { Direction.down } else { Direction.up }
return &Event{
typ: .mouse_scroll
x: x
y: y
direction: direction
modifiers: modifiers
utf8: single
}, end
}
else {
return &Event{
typ: .unknown
utf8: single
}, end
}
}
}
// ----------------------------
// Special key combinations
// ----------------------------
mut code := KeyCode.null
mut modifiers := u32(0)
match buf {
'[A', 'OA' { code = .up }
'[B', 'OB' { code = .down }
'[C', 'OC' { code = .right }
'[D', 'OD' { code = .left }
'[5~', '[[5~' { code = .page_up }
'[6~', '[[6~' { code = .page_down }
'[F', 'OF', '[4~', '[[8~' { code = .end }
'[H', 'OH', '[1~', '[[7~' { code = .home }
'[2~' { code = .insert }
'[3~' { code = .delete }
'OP', '[11~' { code = .f1 }
'OQ', '[12~' { code = .f2 }
'OR', '[13~' { code = .f3 }
'OS', '[14~' { code = .f4 }
'[15~' { code = .f5 }
'[17~' { code = .f6 }
'[18~' { code = .f7 }
'[19~' { code = .f8 }
'[20~' { code = .f9 }
'[21~' { code = .f10 }
'[23~' { code = .f11 }
'[24~' { code = .f12 }
else {}
}
if buf == '[Z' {
code = .tab
modifiers |= shift
}
if buf.len == 5 && buf[0] == `[` && buf[1].is_digit() && buf[2] == `;` {
// code = KeyCode(buf[4] + 197)
modifiers = match buf[3] {
`2` { shift }
`3` { alt }
`4` { shift | alt }
`5` { ctrl }
`6` { ctrl | shift }
`7` { ctrl | alt }
`8` { ctrl | alt | shift }
else { modifiers } // probably unreachable? idk, terminal events are strange
}
if buf[1] == `1` {
code = match buf[4] {
`A` { KeyCode.up }
`B` { KeyCode.down }
`C` { KeyCode.right }
`D` { KeyCode.left }
`F` { KeyCode.end }
`H` { KeyCode.home }
`P` { KeyCode.f1 }
`Q` { KeyCode.f2 }
`R` { KeyCode.f3 }
`S` { KeyCode.f4 }
else { code }
}
} else if buf[1] == `5` {
code = KeyCode.page_up
} else if buf[1] == `6` {
code = KeyCode.page_down
}
}
return &Event{
typ: .key_down
code: code
utf8: single
modifiers: modifiers
}, end
}