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use futures::future::Future as _;
use futures::stream::Stream as _;
use snafu::futures01::StreamExt as _;
use snafu::ResultExt as _;
use std::convert::TryInto as _;
#[derive(Debug, snafu::Snafu)]
pub enum Error {
#[snafu(display("failed to get terminal size"))]
GetTerminalSize,
#[snafu(display("invalid terminal size found: {}", source))]
InvalidTerminalSize { source: std::num::TryFromIntError },
#[snafu(display("SIGWINCH handler failed: {}", source))]
SigWinchHandler { source: std::io::Error },
}
pub type Result<T> = std::result::Result<T, Error>;
pub struct Resizer {
winches:
Box<dyn futures::stream::Stream<Item = (), Error = Error> + Send>,
sent_initial_size: bool,
}
impl Resizer {
pub fn new() -> Self {
Self::default()
}
}
impl Default for Resizer {
fn default() -> Self {
let winches = tokio_signal::unix::Signal::new(
tokio_signal::unix::libc::SIGWINCH,
)
.flatten_stream()
.map(|_| ())
.context(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 = (u16, u16);
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(term_size()?)));
}
futures::try_ready!(self.winches.poll());
Ok(futures::Async::Ready(Some(term_size()?)))
}
}
fn term_size() -> Result<(u16, u16)> {
if let Some((cols, rows)) = term_size::dimensions() {
Ok((
rows.try_into().context(InvalidTerminalSize)?,
cols.try_into().context(InvalidTerminalSize)?,
))
} else {
Err(Error::GetTerminalSize)
}
}
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