From bc32b4d016b06ad5321d715de3791be53b1131d0 Mon Sep 17 00:00:00 2001
From: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Date: Sat, 21 Dec 2024 14:44:18 +0100
Subject: [PATCH] zeta: Compute diff on background thread (#22328)

@iamnbutler noticed slowness in assistant panel which I've pinned down
to the fact that we're calculating buffer diff on foreground thread.
This PR moves this computation into the background; I don't know much
about Zeta but it seems fine to do, as the call-site is asynchronous
anyways.

Closes #ISSUE

Release Notes:

- N/A
---
 crates/zeta/src/zeta.rs | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/crates/zeta/src/zeta.rs b/crates/zeta/src/zeta.rs
index 78faf4883b..d227c0bcab 100644
--- a/crates/zeta/src/zeta.rs
+++ b/crates/zeta/src/zeta.rs
@@ -298,14 +298,21 @@ impl Zeta {
         cx.spawn(|this, mut cx| async move {
             let request_sent_at = Instant::now();
 
-            let mut input_events = String::new();
-            for event in events {
-                if !input_events.is_empty() {
-                    input_events.push('\n');
-                    input_events.push('\n');
-                }
-                input_events.push_str(&event.to_prompt());
-            }
+            let input_events = cx
+                .background_executor()
+                .spawn(async move {
+                    let mut input_events = String::new();
+                    for event in events {
+                        if !input_events.is_empty() {
+                            input_events.push('\n');
+                            input_events.push('\n');
+                        }
+                        input_events.push_str(&event.to_prompt());
+                    }
+                    input_events
+                })
+                .await;
+
             let input_excerpt = prompt_for_excerpt(&snapshot, &excerpt_range, offset);
             let input_outline = prompt_for_outline(&snapshot);