From a30174620d6b64f838989a634c265a353b2ab117 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 5 Jan 2022 07:18:29 -0500
Subject: a bunch more reorganization

---
 src/shell/history/pty.rs | 109 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/shell/history/pty.rs

(limited to 'src/shell/history/pty.rs')

diff --git a/src/shell/history/pty.rs b/src/shell/history/pty.rs
new file mode 100644
index 0000000..602a568
--- /dev/null
+++ b/src/shell/history/pty.rs
@@ -0,0 +1,109 @@
+use crate::shell::prelude::*;
+
+use async_std::io::{ReadExt as _, WriteExt as _};
+use futures_lite::future::FutureExt as _;
+
+pub struct Pty {
+    pty: async_std::sync::Arc<pty_process::Pty>,
+    close_w: async_std::channel::Sender<()>,
+}
+
+impl Pty {
+    pub fn new(
+        size: (u16, u16),
+        entry: &async_std::sync::Arc<async_std::sync::Mutex<super::Entry>>,
+        input_r: async_std::channel::Receiver<Vec<u8>>,
+        resize_r: async_std::channel::Receiver<(u16, u16)>,
+        event_w: async_std::channel::Sender<Event>,
+    ) -> anyhow::Result<Self> {
+        let (close_w, close_r) = async_std::channel::unbounded();
+
+        let pty = pty_process::Pty::new()?;
+        pty.resize(pty_process::Size::new(size.0, size.1))?;
+        let pty = async_std::sync::Arc::new(pty);
+
+        async_std::task::spawn(pty_task(
+            async_std::sync::Arc::clone(&pty),
+            async_std::sync::Arc::clone(entry),
+            input_r,
+            resize_r,
+            close_r,
+            event_w,
+        ));
+
+        Ok(Self { pty, close_w })
+    }
+
+    pub fn spawn(
+        &self,
+        mut cmd: pty_process::Command,
+    ) -> anyhow::Result<async_std::process::Child> {
+        Ok(cmd.spawn(&self.pty)?)
+    }
+
+    pub async fn close(&self) {
+        self.close_w.send(()).await.unwrap();
+    }
+}
+
+async fn pty_task(
+    pty: async_std::sync::Arc<pty_process::Pty>,
+    entry: async_std::sync::Arc<async_std::sync::Mutex<super::Entry>>,
+    input_r: async_std::channel::Receiver<Vec<u8>>,
+    resize_r: async_std::channel::Receiver<(u16, u16)>,
+    close_r: async_std::channel::Receiver<()>,
+    event_w: async_std::channel::Sender<Event>,
+) {
+    loop {
+        enum Res {
+            Read(Result<usize, std::io::Error>),
+            Write(Result<Vec<u8>, async_std::channel::RecvError>),
+            Resize(Result<(u16, u16), async_std::channel::RecvError>),
+            Close(Result<(), async_std::channel::RecvError>),
+        }
+        let mut buf = [0_u8; 4096];
+        let read = async { Res::Read((&*pty).read(&mut buf).await) };
+        let write = async { Res::Write(input_r.recv().await) };
+        let resize = async { Res::Resize(resize_r.recv().await) };
+        let close = async { Res::Close(close_r.recv().await) };
+        match read.race(write).race(resize).or(close).await {
+            Res::Read(res) => match res {
+                Ok(bytes) => {
+                    entry.lock_arc().await.process(&buf[..bytes]);
+                    event_w.send(Event::PtyOutput).await.unwrap();
+                }
+                Err(e) => {
+                    if e.raw_os_error() != Some(libc::EIO) {
+                        panic!("pty read failed: {:?}", e);
+                    }
+                }
+            },
+            Res::Write(res) => match res {
+                Ok(bytes) => {
+                    (&*pty).write(&bytes).await.unwrap();
+                }
+                Err(e) => {
+                    panic!("failed to read from input channel: {}", e);
+                }
+            },
+            Res::Resize(res) => match res {
+                Ok(size) => {
+                    pty.resize(pty_process::Size::new(size.0, size.1))
+                        .unwrap();
+                }
+                Err(e) => {
+                    panic!("failed to read from resize channel: {}", e);
+                }
+            },
+            Res::Close(res) => match res {
+                Ok(()) => {
+                    event_w.send(Event::PtyClose).await.unwrap();
+                    return;
+                }
+                Err(e) => {
+                    panic!("failed to read from close channel: {}", e);
+                }
+            },
+        }
+    }
+}
-- 
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