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v/vlib/term/term_nix.c.v

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module term
import os
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#include <sys/ioctl.h>
#include <termios.h> // TIOCGWINSZ
pub struct C.winsize {
pub:
ws_row u16
ws_col u16
ws_xpixel u16
ws_ypixel u16
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}
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
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// get_terminal_size returns a number of colums and rows of terminal window.
pub fn get_terminal_size() (int, int) {
if os.is_atty(1) <= 0 || os.getenv('TERM') == 'dumb' {
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return default_columns_size, default_rows_size
}
w := C.winsize{}
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 {
if os.is_atty(1) <= 0 || os.getenv('TERM') == 'dumb' {
return Coord{0, 0}
}
old_state := C.termios{}
if unsafe { C.tcgetattr(0, &old_state) } != 0 {
return os.last_error()
}
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
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mut stage := u8(0)
// ESC [ YYY `;` XXX `R`
for {
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
}
}
return Coord{x, y}
}
// set_terminal_title change the terminal title
pub fn set_terminal_title(title string) bool {
if os.is_atty(1) <= 0 || os.getenv('TERM') == 'dumb' {
return true
}
print('\033]0')
print(title)
print('\007')
return true
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}
// clear clears current terminal screen.
pub fn clear() {
print('\x1b[2J')
print('\x1b[H')
}