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