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use std::fs::File;
use std::os::unix::io::{IntoRawFd, RawFd};
use std::{io, mem, process};
use libc::{
cfmakeraw, ioctl, tcgetattr, tcsetattr, termios as Termios, winsize, STDOUT_FILENO, TCSANOW,
TIOCGWINSZ,
};
use parking_lot::Mutex;
use crate::error::Result;
use crate::event::sys::unix::file_descriptor::{tty_fd, FileDesc};
static TERMINAL_MODE_PRIOR_RAW_MODE: Mutex<Option<Termios>> = parking_lot::const_mutex(None);
pub(crate) fn is_raw_mode_enabled() -> bool {
TERMINAL_MODE_PRIOR_RAW_MODE.lock().is_some()
}
#[allow(clippy::useless_conversion)]
pub(crate) fn size() -> Result<(u16, u16)> {
let mut size = winsize {
ws_row: 0,
ws_col: 0,
ws_xpixel: 0,
ws_ypixel: 0,
};
let file = File::open("/dev/tty").map(|file| (FileDesc::new(file.into_raw_fd(), true)));
let fd = if let Ok(file) = &file {
file.raw_fd()
} else {
STDOUT_FILENO
};
if wrap_with_result(unsafe { ioctl(fd, TIOCGWINSZ.into(), &mut size) }).is_ok() {
Ok((size.ws_col, size.ws_row))
} else {
tput_size().ok_or_else(|| std::io::Error::last_os_error().into())
}
}
pub(crate) fn enable_raw_mode() -> Result<()> {
let mut original_mode = TERMINAL_MODE_PRIOR_RAW_MODE.lock();
if original_mode.is_some() {
return Ok(());
}
let tty = tty_fd()?;
let fd = tty.raw_fd();
let mut ios = get_terminal_attr(fd)?;
let original_mode_ios = ios;
raw_terminal_attr(&mut ios);
set_terminal_attr(fd, &ios)?;
*original_mode = Some(original_mode_ios);
Ok(())
}
pub(crate) fn disable_raw_mode() -> Result<()> {
let mut original_mode = TERMINAL_MODE_PRIOR_RAW_MODE.lock();
if let Some(original_mode_ios) = original_mode.as_ref() {
let tty = tty_fd()?;
set_terminal_attr(tty.raw_fd(), original_mode_ios)?;
*original_mode = None;
}
Ok(())
}
fn tput_value(arg: &str) -> Option<u16> {
let output = process::Command::new("tput").arg(arg).output().ok()?;
let value = output
.stdout
.into_iter()
.filter_map(|b| char::from(b).to_digit(10))
.fold(0, |v, n| v * 10 + n as u16);
if value > 0 {
Some(value)
} else {
None
}
}
fn tput_size() -> Option<(u16, u16)> {
match (tput_value("cols"), tput_value("lines")) {
(Some(w), Some(h)) => Some((w, h)),
_ => None,
}
}
fn raw_terminal_attr(termios: &mut Termios) {
unsafe { cfmakeraw(termios) }
}
fn get_terminal_attr(fd: RawFd) -> Result<Termios> {
unsafe {
let mut termios = mem::zeroed();
wrap_with_result(tcgetattr(fd, &mut termios))?;
Ok(termios)
}
}
fn set_terminal_attr(fd: RawFd, termios: &Termios) -> Result<()> {
wrap_with_result(unsafe { tcsetattr(fd, TCSANOW, termios) })
}
fn wrap_with_result(result: i32) -> Result<()> {
if result == -1 {
Err(io::Error::last_os_error())
} else {
Ok(())
}
}