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use std::ffi::OsStr;
use std::io::{self, Error, ErrorKind, Result};
use std::iter::once;
use std::os::windows::ffi::OsStrExt;
use std::sync::mpsc::TryRecvError;
use crate::config::{Program, PtyConfig};
use crate::event::{OnResize, WindowSize};
use crate::tty::windows::child::ChildExitWatcher;
use crate::tty::{ChildEvent, EventedPty, EventedReadWrite};
mod child;
mod conpty;
use conpty::Conpty as Backend;
use mio_anonymous_pipes::{EventedAnonRead as ReadPipe, EventedAnonWrite as WritePipe};
pub struct Pty {
// XXX: Backend is required to be the first field, to ensure correct drop order. Dropping
// `conout` before `backend` will cause a deadlock (with Conpty).
backend: Backend,
conout: ReadPipe,
conin: WritePipe,
read_token: mio::Token,
write_token: mio::Token,
child_event_token: mio::Token,
child_watcher: ChildExitWatcher,
}
pub fn new(config: &PtyConfig, window_size: WindowSize, _window_id: u64) -> Result<Pty> {
conpty::new(config, window_size)
.ok_or_else(|| Error::new(ErrorKind::Other, "failed to spawn conpty"))
}
impl Pty {
fn new(
backend: impl Into<Backend>,
conout: impl Into<ReadPipe>,
conin: impl Into<WritePipe>,
child_watcher: ChildExitWatcher,
) -> Self {
Self {
backend: backend.into(),
conout: conout.into(),
conin: conin.into(),
read_token: 0.into(),
write_token: 0.into(),
child_event_token: 0.into(),
child_watcher,
}
}
}
impl EventedReadWrite for Pty {
type Reader = ReadPipe;
type Writer = WritePipe;
#[inline]
fn register(
&mut self,
poll: &mio::Poll,
token: &mut dyn Iterator<Item = mio::Token>,
interest: mio::Ready,
poll_opts: mio::PollOpt,
) -> io::Result<()> {
self.read_token = token.next().unwrap();
self.write_token = token.next().unwrap();
if interest.is_readable() {
poll.register(&self.conout, self.read_token, mio::Ready::readable(), poll_opts)?
} else {
poll.register(&self.conout, self.read_token, mio::Ready::empty(), poll_opts)?
}
if interest.is_writable() {
poll.register(&self.conin, self.write_token, mio::Ready::writable(), poll_opts)?
} else {
poll.register(&self.conin, self.write_token, mio::Ready::empty(), poll_opts)?
}
self.child_event_token = token.next().unwrap();
poll.register(
self.child_watcher.event_rx(),
self.child_event_token,
mio::Ready::readable(),
poll_opts,
)?;
Ok(())
}
#[inline]
fn reregister(
&mut self,
poll: &mio::Poll,
interest: mio::Ready,
poll_opts: mio::PollOpt,
) -> io::Result<()> {
if interest.is_readable() {
poll.reregister(&self.conout, self.read_token, mio::Ready::readable(), poll_opts)?;
} else {
poll.reregister(&self.conout, self.read_token, mio::Ready::empty(), poll_opts)?;
}
if interest.is_writable() {
poll.reregister(&self.conin, self.write_token, mio::Ready::writable(), poll_opts)?;
} else {
poll.reregister(&self.conin, self.write_token, mio::Ready::empty(), poll_opts)?;
}
poll.reregister(
self.child_watcher.event_rx(),
self.child_event_token,
mio::Ready::readable(),
poll_opts,
)?;
Ok(())
}
#[inline]
fn deregister(&mut self, poll: &mio::Poll) -> io::Result<()> {
poll.deregister(&self.conout)?;
poll.deregister(&self.conin)?;
poll.deregister(self.child_watcher.event_rx())?;
Ok(())
}
#[inline]
fn reader(&mut self) -> &mut Self::Reader {
&mut self.conout
}
#[inline]
fn read_token(&self) -> mio::Token {
self.read_token
}
#[inline]
fn writer(&mut self) -> &mut Self::Writer {
&mut self.conin
}
#[inline]
fn write_token(&self) -> mio::Token {
self.write_token
}
}
impl EventedPty for Pty {
fn child_event_token(&self) -> mio::Token {
self.child_event_token
}
fn next_child_event(&mut self) -> Option<ChildEvent> {
match self.child_watcher.event_rx().try_recv() {
Ok(ev) => Some(ev),
Err(TryRecvError::Empty) => None,
Err(TryRecvError::Disconnected) => Some(ChildEvent::Exited),
}
}
}
impl OnResize for Pty {
fn on_resize(&mut self, window_size: WindowSize) {
self.backend.on_resize(window_size)
}
}
fn cmdline(config: &PtyConfig) -> String {
let default_shell = Program::Just("powershell".to_owned());
let shell = config.shell.as_ref().unwrap_or(&default_shell);
once(shell.program())
.chain(shell.args().iter().map(|a| a.as_ref()))
.collect::<Vec<_>>()
.join(" ")
}
/// Converts the string slice into a Windows-standard representation for "W"-
/// suffixed function variants, which accept UTF-16 encoded string values.
pub fn win32_string<S: AsRef<OsStr> + ?Sized>(value: &S) -> Vec<u16> {
OsStr::new(value).encode_wide().chain(once(0)).collect()
}
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