basic implementation

4 files changed, 1189 insertions, 3 deletions

diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 0000000..bcad605
--- /dev/null
+++ b/.rustfmt.toml
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..1dc5b45
--- /dev/null
+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
index 5b74c72..216e6bd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,10 @@ version = "0.1.0"
 authors = ["Jesse Luehrs <doy@tozt.net>"]
 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<Stdin>,
+    raw_screen: Option<crossterm::screen::RawScreen>,
+    alternate_screen: Option<crossterm::screen::AlternateScreen>,
+    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<T: std::fmt::Display>(&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<Self::Item, Self::Error> {
+        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<usize> {
+        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<EventedStdin>,
+}
+
+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<usize> {
+        self.input.read(buf)
+    }
+}
+
+impl tokio::io::AsyncRead for Stdin {
+    fn poll_read(
+        &mut self,
+        buf: &mut [u8],
+    ) -> std::result::Result<futures::Async<usize>, 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),
+        }
+    }
 }