Add hook/event system

1 files changed, 19 insertions, 0 deletions

diff --git a/helix-event/src/cancel.rs b/helix-event/src/cancel.rs
new file mode 100644
index 00000000..f027be80
--- /dev/null
+++ b/helix-event/src/cancel.rs
@@ -0,0 +1,19 @@
+use std::future::Future;
+
+pub use oneshot::channel as cancelation;
+use tokio::sync::oneshot;
+
+pub type CancelTx = oneshot::Sender<()>;
+pub type CancelRx = oneshot::Receiver<()>;
+
+pub async fn cancelable_future<T>(future: impl Future<Output = T>, cancel: CancelRx) -> Option<T> {
+    tokio::select! {
+        biased;
+        _ = cancel => {
+            None
+        }
+        res = future => {
+            Some(res)
+        }
+    }
+}