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use std::io::{self, Write};
use std::ops;
use nix::sys::termios::{cfmakeraw, tcgetattr, tcsetattr, SetArg, Termios};
use nix::unistd::isatty;
use nix::Error::Sys;
use std::fs;
use std::io::ErrorKind;
use std::os::unix::io::{AsRawFd, RawFd};
pub fn get_tty() -> io::Result<fs::File> {
fs::OpenOptions::new()
.read(true)
.write(true)
.open("/dev/tty")
}
pub struct RawTerminal<W: Write + AsRawFd> {
prev_ios: Termios,
output: W,
}
impl<W: Write + AsRawFd> Drop for RawTerminal<W> {
fn drop(&mut self) {
let _ = tcsetattr(self.output.as_raw_fd(), SetArg::TCSANOW, &self.prev_ios);
}
}
impl<W: Write + AsRawFd> ops::Deref for RawTerminal<W> {
type Target = W;
fn deref(&self) -> &W {
&self.output
}
}
impl<W: Write + AsRawFd> ops::DerefMut for RawTerminal<W> {
fn deref_mut(&mut self) -> &mut W {
&mut self.output
}
}
impl<W: Write + AsRawFd> Write for RawTerminal<W> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.output.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
self.output.flush()
}
}
impl<W: Write + AsRawFd> AsRawFd for RawTerminal<W> {
fn as_raw_fd(&self) -> RawFd {
return self.output.as_raw_fd();
}
}
pub trait IntoRawMode: Write + AsRawFd + Sized {
fn into_raw_mode(self) -> io::Result<RawTerminal<Self>>;
}
impl<W: Write + AsRawFd> IntoRawMode for W {
fn into_raw_mode(self) -> io::Result<RawTerminal<W>> {
use nix::errno::Errno::ENOTTY;
use nix::sys::termios::OutputFlags;
let istty = isatty(self.as_raw_fd()).map_err(nix_err_to_io_err)?;
if !istty {
Err(nix_err_to_io_err(nix::Error::from_errno(ENOTTY)))?
}
let prev_ios = tcgetattr(self.as_raw_fd()).map_err(nix_err_to_io_err)?;
let mut ios = prev_ios.clone();
cfmakeraw(&mut ios);
ios.output_flags |= OutputFlags::OPOST;
tcsetattr(self.as_raw_fd(), SetArg::TCSANOW, &ios).map_err(nix_err_to_io_err)?;
Ok(RawTerminal {
prev_ios,
output: self,
})
}
}
fn nix_err_to_io_err(err: nix::Error) -> io::Error {
match err {
Sys(err_no) => io::Error::from(err_no),
_ => io::Error::new(ErrorKind::InvalidData, err),
}
}
#[cfg(test)]
mod test {
use super::*;
use std::io::{stdout, Write};
}