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use futures::future::Future;
use futures::try_ready;
use tokio::io::AsyncRead;
use tokio_pty_process::CommandExt;
#[derive(Debug)]
pub enum Error {
IOError(std::io::Error),
}
pub fn spawn(
line: &str,
) -> Result<
(
PtyStream,
impl futures::future::Future<
Item = std::process::ExitStatus,
Error = Error,
>,
),
Error,
> {
let master = tokio_pty_process::AsyncPtyMaster::open()
.map_err(|e| Error::IOError(e))?;
let mut argv: Vec<_> = line.split(' ').collect();
let cmd = argv.remove(0);
let child = std::process::Command::new(cmd)
.args(&argv)
.spawn_pty_async(&master)
.map_err(|e| Error::IOError(e))?
.map_err(|e| Error::IOError(e));
let stream = PtyStream::new(master);
Ok((stream, child))
}
pub struct PtyStream {
master: tokio_pty_process::AsyncPtyMaster,
buf: Vec<u8>,
}
impl PtyStream {
fn new(master: tokio_pty_process::AsyncPtyMaster) -> Self {
let buf = Vec::with_capacity(4096);
PtyStream { master, buf }
}
}
#[must_use = "streams do nothing unless polled"]
impl futures::stream::Stream for PtyStream {
type Item = Vec<u8>;
type Error = Error;
fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
self.buf.clear();
let n = try_ready!(self
.master
.read_buf(&mut self.buf)
.map_err(|e| { Error::IOError(e) }));
if n > 0 {
let bytes = self.buf[..n].to_vec();
Ok(futures::Async::Ready(Some(bytes)))
} else {
Ok(futures::Async::NotReady)
}
}
}
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