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|
use crate::shell::prelude::*;
#[derive(Debug)]
enum Request {
Input(Vec<u8>),
Resize(u16, u16),
}
pub struct Pty {
vt: std::sync::Arc<std::sync::Mutex<Vt>>,
request_w: tokio::sync::mpsc::UnboundedSender<Request>,
}
impl Pty {
pub fn new(
size: (u16, u16),
event_w: crate::shell::event::Writer,
) -> Result<(Self, pty_process::Pts)> {
let (request_w, request_r) = tokio::sync::mpsc::unbounded_channel();
let pty = pty_process::Pty::new()?;
pty.resize(pty_process::Size::new(size.0, size.1))?;
let pts = pty.pts()?;
let vt = std::sync::Arc::new(std::sync::Mutex::new(Vt::new(size)));
tokio::spawn(Self::task(
pty,
std::sync::Arc::clone(&vt),
request_r,
event_w,
));
Ok((Self { vt, request_w }, pts))
}
pub fn with_vt<T>(&self, f: impl FnOnce(&Vt) -> T) -> T {
let vt = self.vt.lock().unwrap();
f(&*vt)
}
pub fn with_vt_mut<T>(&self, f: impl FnOnce(&mut Vt) -> T) -> T {
let mut vt = self.vt.lock().unwrap();
f(&mut *vt)
}
pub fn lock_vt(&self) -> std::sync::MutexGuard<Vt> {
self.vt.lock().unwrap()
}
pub fn fullscreen(&self) -> bool {
self.with_vt(|vt| vt.screen().alternate_screen())
}
pub fn input(&self, bytes: Vec<u8>) {
#[allow(clippy::let_underscore_drop)]
let _ = self.request_w.send(Request::Input(bytes));
}
pub fn resize(&self, size: (u16, u16)) {
#[allow(clippy::let_underscore_drop)]
let _ = self.request_w.send(Request::Resize(size.0, size.1));
}
async fn task(
pty: pty_process::Pty,
vt: std::sync::Arc<std::sync::Mutex<Vt>>,
request_r: tokio::sync::mpsc::UnboundedReceiver<Request>,
event_w: crate::shell::event::Writer,
) {
enum Res {
Read(Result<bytes::Bytes, std::io::Error>),
Request(Request),
}
let (pty_r, mut pty_w) = pty.into_split();
let mut stream: futures_util::stream::SelectAll<_> = [
tokio_util::io::ReaderStream::new(pty_r)
.map(Res::Read)
.boxed(),
tokio_stream::wrappers::UnboundedReceiverStream::new(request_r)
.map(Res::Request)
.boxed(),
]
.into_iter()
.collect();
while let Some(res) = stream.next().await {
match res {
Res::Read(res) => match res {
Ok(bytes) => {
vt.lock().unwrap().process(&bytes);
event_w.send(Event::PtyOutput);
}
Err(e) => {
// this means that there are no longer any open pts
// fds. we could alternately signal this through an
// explicit channel at ChildExit time, but this seems
// reliable enough.
if e.raw_os_error() == Some(libc::EIO) {
return;
}
panic!("pty read failed: {:?}", e);
}
},
Res::Request(Request::Input(bytes)) => {
pty_w.write(&bytes).await.unwrap();
}
Res::Request(Request::Resize(row, col)) => {
pty_w.resize(pty_process::Size::new(row, col)).unwrap();
vt.lock().unwrap().set_size((row, col));
}
}
}
}
}
pub struct Vt {
vt: vt100::Parser,
bell_state: usize,
bell: bool,
real_bell_pending: bool,
}
impl Vt {
pub fn new(size: (u16, u16)) -> Self {
Self {
vt: vt100::Parser::new(size.0, size.1, 0),
bell_state: 0,
bell: false,
real_bell_pending: false,
}
}
pub fn process(&mut self, bytes: &[u8]) {
self.vt.process(bytes);
let screen = self.vt.screen();
let new_bell_state = screen.audible_bell_count();
if new_bell_state != self.bell_state {
self.bell = true;
self.real_bell_pending = true;
self.bell_state = new_bell_state;
}
}
pub fn screen(&self) -> &vt100::Screen {
self.vt.screen()
}
pub fn set_size(&mut self, size: (u16, u16)) {
self.vt.set_size(size.0, size.1);
}
pub fn is_bell(&self) -> bool {
self.bell
}
pub fn bell(&mut self, focused: bool) -> bool {
let mut should = false;
if self.real_bell_pending {
if self.bell {
should = true;
}
self.real_bell_pending = false;
}
if focused {
self.bell = false;
}
should
}
pub fn binary(&self) -> bool {
self.vt.screen().errors() > 5
}
pub fn output_lines(&self, focused: bool, running: bool) -> usize {
if self.binary() {
return 1;
}
let screen = self.vt.screen();
let mut last_row = 0;
for (idx, row) in screen.rows(0, screen.size().1).enumerate() {
if !row.is_empty() {
last_row = idx + 1;
}
}
if focused && running {
last_row = std::cmp::max(
last_row,
usize::from(screen.cursor_position().0) + 1,
);
}
last_row
}
}
|
