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use crate::prelude::*;
pub struct Resizer {
winches:
Box<dyn futures::stream::Stream<Item = (), Error = Error> + Send>,
sent_initial_size: bool,
}
impl Resizer {
pub fn new() -> Self {
let winches = tokio_signal::unix::Signal::new(
tokio_signal::unix::libc::SIGWINCH,
)
.flatten_stream()
.map(|_| ())
.context(crate::error::SigWinchHandler);
Self {
winches: Box::new(winches),
sent_initial_size: false,
}
}
}
#[must_use = "streams do nothing unless polled"]
impl futures::stream::Stream for Resizer {
type Item = crate::term::Size;
type Error = Error;
fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
if !self.sent_initial_size {
self.sent_initial_size = true;
return Ok(futures::Async::Ready(
Some(crate::term::Size::get()?),
));
}
let _ = futures::try_ready!(self.winches.poll());
Ok(futures::Async::Ready(Some(crate::term::Size::get()?)))
}
}
pub enum Event<R: tokio::io::AsyncRead + 'static> {
Process(<crate::process::Process<R> as futures::stream::Stream>::Item),
Resize(crate::term::Size),
}
pub struct ResizingProcess<R: tokio::io::AsyncRead + 'static> {
process: crate::process::Process<R>,
resizer: Resizer,
}
impl<R: tokio::io::AsyncRead + 'static> ResizingProcess<R> {
pub fn new(process: crate::process::Process<R>) -> Self {
Self {
process,
resizer: Resizer::new(),
}
}
}
impl<R: tokio::io::AsyncRead + 'static> ResizingProcess<R> {
const POLL_FNS:
&'static [&'static dyn for<'a> Fn(
&'a mut Self,
)
-> crate::component_future::Poll<
Option<Event<R>>,
Error,
>] = &[&Self::poll_resize, &Self::poll_process];
fn poll_resize(
&mut self,
) -> crate::component_future::Poll<Option<Event<R>>, Error> {
let size = try_ready!(self.resizer.poll()).unwrap();
self.process.resize(size.clone());
Ok(crate::component_future::Async::Ready(Some(Event::Resize(
size,
))))
}
fn poll_process(
&mut self,
) -> crate::component_future::Poll<Option<Event<R>>, Error> {
Ok(crate::component_future::Async::Ready(
try_ready!(self.process.poll()).map(Event::Process),
))
}
}
#[must_use = "streams do nothing unless polled"]
impl<R: tokio::io::AsyncRead + 'static> futures::stream::Stream
for ResizingProcess<R>
{
type Item = Event<R>;
type Error =
<crate::process::Process<R> as futures::stream::Stream>::Error;
fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
crate::component_future::poll_stream(self, Self::POLL_FNS)
}
}
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