From d2ee9a839fec83bf4d5090b55fa39b13ce6dfda0 Mon Sep 17 00:00:00 2001 From: Jesse Luehrs Date: Tue, 12 Nov 2019 07:38:36 -0500 Subject: basic implementation --- .rustfmt.toml | 1 + Cargo.lock | 976 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 8 +- src/main.rs | 207 ++++++++++++- 4 files changed, 1189 insertions(+), 3 deletions(-) create mode 100644 .rustfmt.toml create mode 100644 Cargo.lock diff --git a/.rustfmt.toml b/.rustfmt.toml new file mode 100644 index 0000000..bcad605 --- /dev/null +++ b/.rustfmt.toml @@ -0,0 +1 @@ +max_width = 78 diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..1dc5b45 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,976 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "arc-swap" +version = "0.4.3" +source = "registry+https://github.com/rust-lang/crates.io-index" + +[[package]] +name = "autocfg" +version = "0.1.7" +source = 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"0.1.0" authors = ["Jesse Luehrs "] edition = "2018" -# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html - [dependencies] +crossterm = "0.13" +futures = "0.1.29" +mio = "0.6" +tokio = "0.1.22" +tokio-pty-process-stream = "0.2" +vt100 = "0.5" diff --git a/src/main.rs b/src/main.rs index e7a11a9..fb45d6e 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,208 @@ +use futures::stream::Stream as _; +use std::io::Write as _; + fn main() { - println!("Hello, world!"); + let (cmd, args) = if std::env::args().count() > 1 { + ( + std::env::args().nth(1).unwrap(), + std::env::args().skip(2).collect(), + ) + } else { + ( + std::env::var("SHELL").unwrap_or_else(|_| "/bin/sh".to_string()), + vec![], + ) + }; + tokio::run(Passthrough::new(&cmd, &args)); +} + +struct Passthrough { + term: vt100::Parser, + process: tokio_pty_process_stream::ResizingProcess, + raw_screen: Option, + alternate_screen: Option, + done: bool, +} + +impl Passthrough { + fn new(cmd: &str, args: &[String]) -> Self { + let input = Stdin::new(); + let process = tokio_pty_process_stream::ResizingProcess::new( + tokio_pty_process_stream::Process::new(cmd, args, input), + ); + Self { + term: vt100::Parser::default(), + process, + raw_screen: None, + alternate_screen: None, + done: false, + } + } + + fn err(&mut self, e: T) { + self.alternate_screen = None; + self.raw_screen = None; + eprintln!("{}", e); + } +} + +impl futures::future::Future for Passthrough { + type Item = (); + type Error = (); + + fn poll(&mut self) -> futures::Poll { + loop { + let event = futures::try_ready!(self + .process + .poll() + .map_err(|e| self.err(e))); + match event { + Some(tokio_pty_process_stream::Event::CommandStart { + .. + }) => { + if self.raw_screen.is_none() { + self.raw_screen = Some( + crossterm::screen::RawScreen::into_raw_mode() + .map_err(|e| self.err(e))?, + ); + } + if self.alternate_screen.is_none() { + self.alternate_screen = Some( + crossterm::screen::AlternateScreen::to_alternate( + false, + ) + .map_err(|e| self.err(e))?, + ); + } + write(&self.term.screen().contents_formatted()) + .map_err(|e| self.err(e))?; + } + Some(tokio_pty_process_stream::Event::CommandExit { + .. + }) => { + self.done = true; + } + Some(tokio_pty_process_stream::Event::Output { data }) => { + let screen = self.term.screen().clone(); + self.term.process(&data); + write(&self.term.screen().contents_diff(&screen)) + .map_err(|e| self.err(e))?; + } + Some(tokio_pty_process_stream::Event::Resize { + size: (rows, cols), + }) => { + self.term.set_size(rows, cols); + } + None => { + if !self.done { + unreachable!() + } + return Ok(futures::Async::Ready(())); + } + } + } + } +} + +fn write(data: &[u8]) -> std::io::Result<()> { + let stdout = std::io::stdout(); + let mut stdout = stdout.lock(); + stdout.write_all(data)?; + stdout.flush()?; + Ok(()) +} + +struct EventedStdin; + +const STDIN: i32 = 0; + +impl std::io::Read for EventedStdin { + fn read(&mut self, buf: &mut [u8]) -> std::io::Result { + let stdin = std::io::stdin(); + let mut stdin = stdin.lock(); + stdin.read(buf) + } +} + +impl mio::Evented for EventedStdin { + fn register( + &self, + poll: &mio::Poll, + token: mio::Token, + interest: mio::Ready, + opts: mio::PollOpt, + ) -> std::io::Result<()> { + let fd = STDIN as std::os::unix::io::RawFd; + let eventedfd = mio::unix::EventedFd(&fd); + eventedfd.register(poll, token, interest, opts) + } + + fn reregister( + &self, + poll: &mio::Poll, + token: mio::Token, + interest: mio::Ready, + opts: mio::PollOpt, + ) -> std::io::Result<()> { + let fd = STDIN as std::os::unix::io::RawFd; + let eventedfd = mio::unix::EventedFd(&fd); + eventedfd.reregister(poll, token, interest, opts) + } + + fn deregister(&self, poll: &mio::Poll) -> std::io::Result<()> { + let fd = STDIN as std::os::unix::io::RawFd; + let eventedfd = mio::unix::EventedFd(&fd); + eventedfd.deregister(poll) + } +} + +pub struct Stdin { + input: tokio::reactor::PollEvented2, +} + +impl Stdin { + pub fn new() -> Self { + Self::default() + } +} + +impl Default for Stdin { + fn default() -> Self { + Self { + input: tokio::reactor::PollEvented2::new(EventedStdin), + } + } +} + +impl std::io::Read for Stdin { + fn read(&mut self, buf: &mut [u8]) -> std::io::Result { + self.input.read(buf) + } +} + +impl tokio::io::AsyncRead for Stdin { + fn poll_read( + &mut self, + buf: &mut [u8], + ) -> std::result::Result, tokio::io::Error> { + // XXX this is why i had to do the EventedFd thing - poll_read on its + // own will block reading from stdin, so i need a way to explicitly + // check readiness before doing the read + let ready = mio::Ready::readable(); + match self.input.poll_read_ready(ready)? { + futures::Async::Ready(_) => { + let res = self.input.poll_read(buf); + + // XXX i'm pretty sure this is wrong (if the single poll_read + // call didn't return all waiting data, clearing read ready + // state means that we won't get the rest until some more data + // beyond that appears), but i don't know that there's a way + // to do it correctly given that poll_read blocks + self.input.clear_read_ready(ready)?; + + res + } + futures::Async::NotReady => Ok(futures::Async::NotReady), + } + } } -- cgit v1.2.3-54-g00ecf