From 193e1963afc4e9e78122573cd5b9831f9a847345 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Thu, 24 Feb 2022 16:34:56 -0500
Subject: go back to not using tokio::select!

---
 Cargo.toml                |  3 +++
 examples/tmux_impl/mod.rs | 39 ++++++++++++++++++++++++++-------------
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 5d7b5be..da176ef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,10 +27,13 @@ async = ["tokio"]
 [dev-dependencies]
 assert_cmd = "2.0.4"
 assert_fs = "1.0.7"
+bytes = "1.1.0"
 escargot = "0.5.7"
+futures = "0.3.21"
 libc = "0.2.119"
 pty-process = { version = "0.2.0", features = ["async"] }
 tokio = { version = "1.17.0", features = ["full"] }
+tokio-util = { version = "0.7.0", features = ["io"] }
 
 [patch.crates-io]
 nix = { git = "https://github.com/nix-rust/nix" }
diff --git a/examples/tmux_impl/mod.rs b/examples/tmux_impl/mod.rs
index 313aaf2..e05ea51 100644
--- a/examples/tmux_impl/mod.rs
+++ b/examples/tmux_impl/mod.rs
@@ -1,5 +1,6 @@
+use futures::stream::StreamExt as _;
 use textmode::Textmode as _;
-use tokio::io::{AsyncReadExt as _, AsyncWriteExt as _};
+use tokio::io::AsyncWriteExt as _;
 
 #[derive(Debug)]
 enum Command {
@@ -153,7 +154,7 @@ impl State {
         pty.resize(pty_process::Size::new(24, 80)).unwrap();
         let mut cmd = pty_process::Command::new("zsh");
         let mut child = cmd.spawn(&pts).unwrap();
-        let (mut pty_r, pty_w) = pty.into_split();
+        let (pty_r, pty_w) = pty.into_split();
         let vt = vt100::Parser::default();
         let screen = vt.screen().clone();
         let vt = std::sync::Arc::new(tokio::sync::Mutex::new(vt));
@@ -168,19 +169,31 @@ impl State {
         self.current_window = id;
         self.notify(&format!("created window {}", id));
         tokio::task::spawn(async move {
+            enum Res {
+                Bytes(tokio::io::Result<bytes::Bytes>),
+                Done,
+            }
+
             let _pts = pts;
-            let mut buf = [0_u8; 4096];
-            loop {
-                tokio::select! {
-                    bytes = pty_r.read(&mut buf) => match bytes {
+
+            let mut stream: futures::stream::SelectAll<_> = [
+                tokio_util::io::ReaderStream::new(pty_r)
+                    .map(Res::Bytes)
+                    .boxed(),
+                futures::stream::once(child.wait())
+                    .map(|_| Res::Done)
+                    .boxed(),
+            ]
+            .into_iter()
+            .collect();
+            while let Some(res) = stream.next().await {
+                match res {
+                    Res::Bytes(bytes) => match bytes {
                         Ok(bytes) => {
-                            if bytes == 0 {
+                            if bytes.is_empty() {
                                 continue;
                             }
-                            vt.clone()
-                                .lock_owned()
-                                .await
-                                .process(&buf[..bytes]);
+                            vt.clone().lock_owned().await.process(&bytes);
                             notify.send(Event::Output).unwrap();
                         }
                         Err(e) => {
@@ -188,10 +201,10 @@ impl State {
                             break;
                         }
                     },
-                    _ = child.wait() => {
+                    Res::Done => {
                         notify.send(Event::WindowExit(id)).unwrap();
                         break;
-                    },
+                    }
                 }
             }
         });
-- 
cgit v1.2.3-54-g00ecf