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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 std::sync::Arc;
use crate::event::{OnResize, WindowSize};
use crate::tty::windows::child::ChildExitWatcher;
use crate::tty::{ChildEvent, EventedPty, EventedReadWrite, Options, Shell};
mod blocking;
mod child;
mod conpty;
use blocking::{UnblockedReader, UnblockedWriter};
use conpty::Conpty as Backend;
use miow::pipe::{AnonRead, AnonWrite};
use polling::{Event, Poller};
pub const PTY_CHILD_EVENT_TOKEN: usize = 1;
pub const PTY_READ_WRITE_TOKEN: usize = 2;
type ReadPipe = UnblockedReader<AnonRead>;
type WritePipe = UnblockedWriter<AnonWrite>;
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,
child_watcher: ChildExitWatcher,
}
pub fn new(config: &Options, 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(), child_watcher }
}
pub fn child_watcher(&self) -> &ChildExitWatcher {
&self.child_watcher
}
}
fn with_key(mut event: Event, key: usize) -> Event {
event.key = key;
event
}
impl EventedReadWrite for Pty {
type Reader = ReadPipe;
type Writer = WritePipe;
#[inline]
unsafe fn register(
&mut self,
poll: &Arc<Poller>,
interest: polling::Event,
poll_opts: polling::PollMode,
) -> io::Result<()> {
self.conin.register(poll, with_key(interest, PTY_READ_WRITE_TOKEN), poll_opts);
self.conout.register(poll, with_key(interest, PTY_READ_WRITE_TOKEN), poll_opts);
self.child_watcher.register(poll, with_key(interest, PTY_CHILD_EVENT_TOKEN));
Ok(())
}
#[inline]
fn reregister(
&mut self,
poll: &Arc<Poller>,
interest: polling::Event,
poll_opts: polling::PollMode,
) -> io::Result<()> {
self.conin.register(poll, with_key(interest, PTY_READ_WRITE_TOKEN), poll_opts);
self.conout.register(poll, with_key(interest, PTY_READ_WRITE_TOKEN), poll_opts);
self.child_watcher.register(poll, with_key(interest, PTY_CHILD_EVENT_TOKEN));
Ok(())
}
#[inline]
fn deregister(&mut self, _poll: &Arc<Poller>) -> io::Result<()> {
self.conin.deregister();
self.conout.deregister();
self.child_watcher.deregister();
Ok(())
}
#[inline]
fn reader(&mut self) -> &mut Self::Reader {
&mut self.conout
}
#[inline]
fn writer(&mut self) -> &mut Self::Writer {
&mut self.conin
}
}
impl EventedPty for Pty {
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: &Options) -> String {
let default_shell = Shell::new("powershell".to_owned(), Vec::new());
let shell = config.shell.as_ref().unwrap_or(&default_shell);
once(shell.program.as_str())
.chain(shell.args.iter().map(|s| s.as_str()))
.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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