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wayland: spawn the pty after the first configure

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Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I0fb9dd38217943d4defd908f857d78766a6a6964
This commit is contained in:
raf 2026-06-24 12:06:21 +03:00
commit 0df5588f02
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GPG key ID: 29D95B64378DB4BF
1 changed files with 111 additions and 59 deletions
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152
src/wayland.rs
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@ -10,7 +10,7 @@ use std::time::Duration;
use anyhow::Context;
use calloop::generic::Generic;
use calloop::{EventLoop, Interest, Mode, PostAction};
use calloop::{EventLoop, Interest, LoopHandle, Mode, PostAction};
use calloop_wayland_source::WaylandSource;
use crate::font::Fonts;
@ -77,42 +77,6 @@ pub fn run() -> anyhow::Result<ExitCode> {
let fonts = Fonts::new(FONT_FAMILY, FONT_SIZE_PX).context("load font")?;
let renderer = Renderer::new(fonts);
let (cols, rows) = grid_size(renderer.metrics(), DEFAULT_W, DEFAULT_H);
let pty = Pty::spawn(cols, rows).context("spawn shell on pty")?;
let term = Term::new(cols as usize, rows as usize);
let mut parser = vte::Parser::new();
// Read child output off a clone of the master; the original stays in `pty`
// for writing input back.
let read_fd = pty.master().try_clone().context("clone pty master")?;
event_loop
.handle()
.insert_source(
Generic::new(read_fd, Interest::READ, Mode::Level),
move |_, fd, app: &mut App| {
let mut buf = [0u8; 4096];
match rustix::io::read(&*fd, &mut buf) {
Ok(0) => {
app.child_exited();
Ok(PostAction::Remove)
}
Ok(n) => {
parser.advance(&mut app.term, &buf[..n]);
app.after_feed();
Ok(PostAction::Continue)
}
Err(rustix::io::Errno::INTR | rustix::io::Errno::AGAIN) => {
Ok(PostAction::Continue)
}
Err(_) => {
app.child_exited();
Ok(PostAction::Remove)
}
}
},
)
.map_err(|e| anyhow::anyhow!("register pty in event loop: {e}"))?;
let mut app = App {
registry_state: RegistryState::new(&globals),
@ -121,9 +85,12 @@ pub fn run() -> anyhow::Result<ExitCode> {
shm,
pool,
window,
pty,
term,
renderer,
loop_handle: event_loop.handle(),
// The PTY is spawned on the first configure, once the real window size
// is known, so the shell starts at the final size and is not hit by a
// startup SIGWINCH storm that makes it reprint its prompt.
session: None,
title: None,
width: DEFAULT_W,
height: DEFAULT_H,
@ -165,6 +132,14 @@ fn write_all(fd: &OwnedFd, mut buf: &[u8]) -> rustix::io::Result<()> {
Ok(())
}
/// The per-window terminal: the PTY and the parsed screen behind it. Created on
/// the first configure, once the real size is known.
#[derive(Debug)]
struct Session {
pty: Pty,
term: Term,
}
/// Window + Wayland client state shared across all protocol handlers.
#[derive(Debug)]
struct App {
@ -174,9 +149,10 @@ struct App {
shm: Shm,
pool: SlotPool,
window: Window,
pty: Pty,
term: Term,
renderer: Renderer,
loop_handle: LoopHandle<'static, App>,
/// `None` until the first configure spawns the shell.
session: Option<Session>,
/// Last title applied to the toplevel, to avoid redundant requests.
title: Option<String>,
width: u32,
@ -191,17 +167,79 @@ struct App {
}
impl App {
/// Spawn the shell at the current window size and start reading its output.
fn spawn_session(&mut self) {
let (cols, rows) = grid_size(self.renderer.metrics(), self.width, self.height);
let pty = match Pty::spawn(cols, rows) {
Ok(pty) => pty,
Err(err) => {
tracing::error!("spawn shell: {err:#}");
self.exit = true;
return;
}
};
let read_fd = match pty.master().try_clone() {
Ok(fd) => fd,
Err(err) => {
tracing::error!("clone pty master: {err}");
self.exit = true;
return;
}
};
let mut parser = vte::Parser::new();
let source = Generic::new(read_fd, Interest::READ, Mode::Level);
let registered = self
.loop_handle
.insert_source(source, move |_, fd, app: &mut App| {
let mut buf = [0u8; 4096];
let n = match rustix::io::read(&*fd, &mut buf) {
Ok(0) => {
app.child_exited();
return Ok(PostAction::Remove);
}
Ok(n) => n,
Err(rustix::io::Errno::INTR | rustix::io::Errno::AGAIN) => {
return Ok(PostAction::Continue);
}
Err(_) => {
app.child_exited();
return Ok(PostAction::Remove);
}
};
if let Some(session) = app.session.as_mut() {
parser.advance(&mut session.term, &buf[..n]);
}
app.after_feed();
Ok(PostAction::Continue)
});
if let Err(err) = registered {
tracing::error!("register pty in event loop: {err}");
self.exit = true;
return;
}
self.session = Some(Session {
pty,
term: Term::new(cols as usize, rows as usize),
});
}
/// After parsing child output: send any replies, sync the title, repaint.
fn after_feed(&mut self) {
let reply = self.term.take_response();
let Some(session) = self.session.as_mut() else {
return;
};
let reply = session.term.take_response();
if !reply.is_empty()
&& let Err(err) = write_all(self.pty.master(), &reply)
&& let Err(err) = write_all(session.pty.master(), &reply)
{
tracing::warn!("write to pty: {err}");
}
if self.term.title() != self.title.as_deref() {
self.title = self.term.title().map(str::to_owned);
let new_title = session.term.title().map(str::to_owned);
if new_title.as_deref() != self.title.as_deref() {
self.title = new_title;
self.window
.set_title(self.title.clone().unwrap_or_default());
}
@ -212,11 +250,16 @@ impl App {
/// PTY about it if it changed.
fn resize_grid(&mut self) {
let (cols, rows) = grid_size(self.renderer.metrics(), self.width, self.height);
if (cols as usize, rows as usize) == (self.term.grid().cols(), self.term.grid().rows()) {
let Some(session) = self.session.as_mut() else {
return;
};
if (cols as usize, rows as usize)
== (session.term.grid().cols(), session.term.grid().rows())
{
return;
}
self.term.resize(cols as usize, rows as usize);
if let Err(err) = self.pty.resize(cols, rows) {
session.term.resize(cols as usize, rows as usize);
if let Err(err) = session.pty.resize(cols, rows) {
tracing::warn!("resize pty: {err}");
}
}
@ -224,7 +267,8 @@ impl App {
/// The child shell has gone away; reap it, capture its code, and tear the
/// window down.
fn child_exited(&mut self) {
match self.pty.wait() {
if let Some(session) = self.session.as_mut() {
match session.pty.wait() {
Ok(status) => {
tracing::info!("shell exited: {status}");
// Mirror the shell's status: its code, or 128+signal if killed.
@ -235,11 +279,15 @@ impl App {
}
Err(err) => tracing::warn!("reap shell: {err}"),
}
}
self.exit = true;
}
/// Render the grid into a fresh buffer and present it.
fn draw(&mut self) {
let Some(session) = self.session.as_ref() else {
return;
};
let (w, h) = (self.width, self.height);
let stride = w as i32 * 4;
@ -256,7 +304,7 @@ impl App {
};
self.renderer.render(
self.term.grid(),
session.term.grid(),
canvas,
w as usize,
h as usize,
@ -331,7 +379,11 @@ impl WindowHandler for App {
self.height = h.get();
}
self.focused = configure.is_activated();
if self.session.is_none() {
self.spawn_session();
} else {
self.resize_grid();
}
self.draw();
}
}