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Project level git diff recalc handling

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This avoids an issue where in a many-buffer multi-buffer, each modified
buffer could complete its recalc independently, causing a cascade of
repeated notifies

Now all recalcs started at the same time must complete before
 A: Starting another recalc pass
 B: The master notify occurring

Each buffer can still show its new diff if something else triggers it
to notify earlier, this is desirable and does not have the same negative
effects as the notify cascade as those re-layouts would need to happen
anyway

Co-Authored-By: Max Brunsfeld <max@zed.dev>
This commit is contained in:
Julia 2023-05-18 18:25:58 -04:00
parent 54421b11f3
commit cede296b04
4 changed files with 64 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

55
crates/project/src/project.rs
View file

@ -1610,6 +1610,7 @@ impl Project {
buffer: &ModelHandle<Buffer>,
cx: &mut ModelContext<Self>,
) -> Result<()> {
self.request_buffer_diff_recalculation(buffer, cx);
buffer.update(cx, |buffer, _| {
buffer.set_language_registry(self.languages.clone())
});
@ -1928,17 +1929,7 @@ impl Project {
cx: &mut ModelContext<Self>,
) -> Option<()> {
if matches!(event, BufferEvent::Edited { .. } | BufferEvent::Reloaded) {
self.buffers_needing_diff.insert(buffer.downgrade());
if self.buffers_needing_diff.len() == 1 {
let this = cx.weak_handle();
cx.defer(move |cx| {
if let Some(this) = this.upgrade(cx) {
this.update(cx, |this, cx| {
this.recalculate_buffer_diffs(cx);
});
}
});
}
self.request_buffer_diff_recalculation(&buffer, cx);
}
match event {
@ -2080,11 +2071,33 @@ impl Project {
None
}
fn request_buffer_diff_recalculation(
&mut self,
buffer: &ModelHandle<Buffer>,
cx: &mut ModelContext<Self>,
) {
self.buffers_needing_diff.insert(buffer.downgrade());
if self.buffers_needing_diff.len() == 1 {
let this = cx.weak_handle();
cx.defer(move |cx| {
if let Some(this) = this.upgrade(cx) {
this.update(cx, |this, cx| {
this.recalculate_buffer_diffs(cx);
});
}
});
}
}
fn recalculate_buffer_diffs(&mut self, cx: &mut ModelContext<Self>) {
cx.spawn(|this, mut cx| async move {
let tasks: Vec<_> = this.update(&mut cx, |this, cx| {
this.buffers_needing_diff
.drain()
let buffers: Vec<_> = this.update(&mut cx, |this, _| {
this.buffers_needing_diff.drain().collect()
});
let tasks: Vec<_> = this.update(&mut cx, |_, cx| {
buffers
.iter()
.filter_map(|buffer| {
let buffer = buffer.upgrade(cx)?;
buffer.update(cx, |buffer, cx| buffer.git_diff_recalc_2(cx))
@ -2092,11 +2105,18 @@ impl Project {
.collect()
});
let updates = futures::future::join_all(tasks).await;
futures::future::join_all(tasks).await;
this.update(&mut cx, |this, cx| {
if !this.buffers_needing_diff.is_empty() {
this.recalculate_buffer_diffs(cx);
} else {
// TODO: Would a `ModelContext<Project>.notify()` suffice here?
for buffer in buffers {
if let Some(buffer) = buffer.upgrade(cx) {
buffer.update(cx, |_, cx| cx.notify());
}
}
}
});
})
@ -6229,11 +6249,13 @@ impl Project {
let Some(this) = this.upgrade(&cx) else {
return Err(anyhow!("project dropped"));
};
let buffer = this.read_with(&cx, |this, cx| {
this.opened_buffers
.get(&id)
.and_then(|buffer| buffer.upgrade(cx))
});
if let Some(buffer) = buffer {
break buffer;
} else if this.read_with(&cx, |this, _| this.is_read_only()) {
@ -6244,12 +6266,13 @@ impl Project {
this.incomplete_remote_buffers.entry(id).or_default();
});
drop(this);
opened_buffer_rx
.next()
.await
.ok_or_else(|| anyhow!("project dropped while waiting for buffer"))?;
};
buffer.update(&mut cx, |buffer, cx| buffer.git_diff_recalc(cx));
Ok(buffer)
})
}