feat: add timeout to select_buffer

src/tools.rs

@@ -1,4 +1,6 @@
 use crate::{Error, api::Controller};
+use std::sync::Arc;
+use tokio::sync::mpsc;
 
 /// invoke .poll() on all buffer controllers and wait, return name of first one ready
 ///
@@ -8,19 +10,29 @@ use crate::{Error, api::Controller};
 ///
 /// this is not super efficient as of now but has room for improvement. using this API may
 /// provide significant improvements on editor-side
-pub async fn select_buffer(buffers: &[std::sync::Arc<crate::buffer::Controller>]) -> crate::Result<String> {
-	let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel();
+pub async fn select_buffer(
+	buffers: &[Arc<crate::buffer::Controller>],
+	timeout: Option<std::time::Duration>,
+) -> crate::Result<Option<Arc<crate::buffer::Controller>>> {
+	let (tx, mut rx) = mpsc::unbounded_channel();
 	let mut tasks = Vec::new();
 	for buffer in buffers {
 		let _tx = tx.clone();
 		let _buffer = buffer.clone();
 		tasks.push(tokio::spawn(async move {
 			match _buffer.poll().await {
-				Ok(()) => _tx.send(Ok(_buffer.name.clone())),
+				Ok(()) => _tx.send(Ok(Some(_buffer))),
 				Err(_) => _tx.send(Err(Error::Channel { send: true })),
 			}
 		}))
 	}
+	if let Some(d) = timeout {
+		let _tx = tx.clone();
+		tasks.push(tokio::spawn(async move {
+			tokio::time::sleep(d).await;
+			_tx.send(Ok(None))
+		}));
+	}
 	loop {
 		match rx.recv().await {
 			None => return Err(Error::Channel { send: false }),