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/// The path to the default TTY on linux
pub const TTY_PATH: &str = "/dev/tty";
#[cfg(unix)]
pub(crate) mod imp {
use std::{
fs::File,
io,
io::{BufRead, Read, Write},
};
use parking_lot::{const_mutex, lock_api::MutexGuard, Mutex, RawMutex};
use rustix::termios::{self, Termios};
use crate::{unix::TTY_PATH, Error, Mode, Options};
static TERM_STATE: Mutex<Option<Termios>> = const_mutex(None);
/// Ask the user given a `prompt`, returning the result.
pub(crate) fn ask(prompt: &str, Options { mode, .. }: &Options<'_>) -> Result<String, Error> {
match mode {
Mode::Disable => Err(Error::Disabled),
Mode::Hidden => {
let state = TERM_STATE.lock();
let mut in_out = save_term_state_and_disable_echo(
state,
std::fs::OpenOptions::new().write(true).read(true).open(TTY_PATH)?,
)?;
in_out.write_all(prompt.as_bytes())?;
let mut buf_read = std::io::BufReader::with_capacity(64, in_out);
let mut out = String::with_capacity(64);
buf_read.read_line(&mut out)?;
out.pop();
if out.ends_with('\r') {
out.pop();
}
buf_read.into_inner().restore_term_state()?;
Ok(out)
}
Mode::Visible => {
let mut in_out = std::fs::OpenOptions::new().write(true).read(true).open(TTY_PATH)?;
in_out.write_all(prompt.as_bytes())?;
let mut buf_read = std::io::BufReader::with_capacity(64, in_out);
let mut out = String::with_capacity(64);
buf_read.read_line(&mut out)?;
Ok(out.trim_end().to_owned())
}
}
}
type TermiosGuard<'a> = MutexGuard<'a, RawMutex, Option<Termios>>;
struct RestoreTerminalStateOnDrop<'a> {
state: TermiosGuard<'a>,
fd: File,
}
impl<'a> Read for RestoreTerminalStateOnDrop<'a> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.fd.read(buf)
}
fn read_vectored(&mut self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> {
self.fd.read_vectored(bufs)
}
}
impl<'a> Write for RestoreTerminalStateOnDrop<'a> {
#[inline(always)]
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.fd.write(buf)
}
#[inline(always)]
fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
self.fd.write_vectored(bufs)
}
#[inline(always)]
fn flush(&mut self) -> io::Result<()> {
self.fd.flush()
}
}
impl<'a> RestoreTerminalStateOnDrop<'a> {
fn restore_term_state(mut self) -> Result<(), Error> {
let state = self.state.take().expect("BUG: we exist only if something is saved");
termios::tcsetattr(&self.fd, termios::OptionalActions::Flush, &state)?;
Ok(())
}
}
impl<'a> Drop for RestoreTerminalStateOnDrop<'a> {
fn drop(&mut self) {
if let Some(state) = self.state.take() {
termios::tcsetattr(&self.fd, termios::OptionalActions::Flush, &state).ok();
}
}
}
fn save_term_state_and_disable_echo(
mut state: TermiosGuard<'_>,
fd: File,
) -> Result<RestoreTerminalStateOnDrop<'_>, Error> {
assert!(
state.is_none(),
"BUG: recursive calls are not possible and we restore afterwards"
);
let prev = termios::tcgetattr(&fd)?;
let mut new = prev;
*state = prev.into();
new.c_lflag &= !termios::ECHO;
new.c_lflag |= termios::ECHONL;
termios::tcsetattr(&fd, termios::OptionalActions::Flush, &new)?;
Ok(RestoreTerminalStateOnDrop { fd, state })
}
}
|
