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term: obtain the cursor position via termios.h (#11372)

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2021-09-06 14:24:39 +00:00
committed by GitHub
parent 78c26e69cf
commit af28d09630
19 changed files with 190 additions and 123 deletions
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94
vlib/term/term_nix.c.v
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@ -13,6 +13,10 @@ pub:
ws_ypixel u16
}
fn C.tcgetattr(fd int, ptr &C.termios) int
fn C.tcsetattr(fd int, action int, const_ptr &C.termios)
fn C.ioctl(fd int, request u64, arg voidptr) int
// get_terminal_size returns a number of colums and rows of terminal window.
@ -21,70 +25,58 @@ pub fn get_terminal_size() (int, int) {
return default_columns_size, default_rows_size
}
w := C.winsize{}
C.ioctl(1, u64(C.TIOCGWINSZ), &w)
unsafe { C.ioctl(1, u64(C.TIOCGWINSZ), &w) }
return int(w.ws_col), int(w.ws_row)
}
// get_cursor_position returns a Coord containing the current cursor position
pub fn get_cursor_position() Coord {
pub fn get_cursor_position() ?Coord {
if os.is_atty(1) <= 0 || os.getenv('TERM') == 'dumb' {
return Coord{
x: 0
y: 0
}
return Coord{0, 0}
}
// TODO: use termios.h, C.tcgetattr & C.tcsetattr directly,
// instead of using `stty`
mut oldsettings := os.execute('stty -g')
if oldsettings.exit_code < 0 {
oldsettings = os.Result{}
old_state := C.termios{}
if unsafe { C.tcgetattr(0, &old_state) } != 0 {
return os.last_error()
}
os.system('stty -echo -icanon time 0')
print('\033[6n')
mut ch := int(0)
mut i := 0
// ESC [ YYY `;` XXX `R`
mut reading_x := false
mut reading_y := false
defer {
// restore the old terminal state:
unsafe { C.tcsetattr(0, C.TCSANOW, &old_state) }
}
mut state := C.termios{}
if unsafe { C.tcgetattr(0, &state) } != 0 {
return os.last_error()
}
state.c_lflag &= int(~(u32(C.ICANON) | u32(C.ECHO)))
unsafe { C.tcsetattr(0, C.TCSANOW, &state) }
print('\e[6n')
mut x := 0
mut y := 0
mut stage := byte(0)
// ESC [ YYY `;` XXX `R`
for {
ch = C.getchar()
b := byte(ch)
i++
if i >= 15 {
panic('C.getchar() called too many times')
}
// state management:
if b == `R` {
w := unsafe { C.getchar() }
if w < 0 {
return error_with_code('Failed to read from stdin', 888)
} else if w == `[` || w == `;` {
stage++
} else if `0` <= w && w <= `9` {
match stage {
// converting string values to int:
1 { y = y * 10 + int(w - `0`) }
2 { x = x * 10 + int(w - `0`) }
else {}
}
} else if w == `R` {
break
}
if b == `[` {
reading_y = true
reading_x = false
continue
}
if b == `;` {
reading_y = false
reading_x = true
continue
}
// converting string vals to ints:
if reading_x {
x *= 10
x += (b - byte(`0`))
}
if reading_y {
y *= 10
y += (b - byte(`0`))
}
}
// restore the old terminal settings:
os.system('stty $oldsettings.output')
return Coord{
x: x
y: y
}
return Coord{x, y}
}
// set_terminal_title change the terminal title