1use std::time::Duration;
 2
 3use futures::{channel::oneshot, FutureExt};
 4use gpui::{ModelContext, Task};
 5
 6use crate::Project;
 7
 8pub struct DebouncedDelay {
 9    task: Option<Task<()>>,
10    cancel_channel: Option<oneshot::Sender<()>>,
11}
12
13impl DebouncedDelay {
14    pub fn new() -> DebouncedDelay {
15        DebouncedDelay {
16            task: None,
17            cancel_channel: None,
18        }
19    }
20
21    pub fn fire_new<F>(&mut self, delay: Duration, cx: &mut ModelContext<Project>, func: F)
22    where
23        F: 'static + Send + FnOnce(&mut Project, &mut ModelContext<Project>) -> Task<()>,
24    {
25        if let Some(channel) = self.cancel_channel.take() {
26            _ = channel.send(());
27        }
28
29        let (sender, mut receiver) = oneshot::channel::<()>();
30        self.cancel_channel = Some(sender);
31
32        let previous_task = self.task.take();
33        self.task = Some(cx.spawn(move |model, mut cx| async move {
34            let mut timer = cx.background_executor().timer(delay).fuse();
35            if let Some(previous_task) = previous_task {
36                previous_task.await;
37            }
38
39            futures::select_biased! {
40                _ = receiver => return,
41                _ = timer => {}
42            }
43
44            if let Ok(task) = model.update(&mut cx, |project, cx| (func)(project, cx)) {
45                task.await;
46            }
47        }));
48    }
49}