Improve Worktrunk sidebar refresh performance

macos/Sources/Features/Worktrunk/WorktrunkSidebarView.swift

@@ -194,7 +194,7 @@ struct WorktrunkSidebarView: View {
                 )
             }
             clearSelectionIfMainInFlatMode()
-            Task { await store.refreshAll() }
+            Task { await store.refreshForSidebarAppearIfNeeded() }
         }
         .alert(
             "Remove Repository?",

macos/Sources/Features/Worktrunk/WorktrunkStore.swift

@@ -186,6 +186,13 @@ enum WorktrunkSidebarListMode: String {
 }
 
 final class WorktrunkStore: ObservableObject {
+    private enum RefreshAllTrigger {
+        case sidebarAppear
+        case repositoryAdded
+        case worktrunkInstalled
+        case manual
+    }
+
     struct Repository: Identifiable, Codable, Hashable {
         var id: UUID
         var path: String
@@ -302,7 +309,12 @@ final class WorktrunkStore: ObservableObject {
     private var lastAppQuitTimestamp: Date?
     private var sidebarModelRevisionCounter: Int = 0
     private var refreshAllTask: Task<Void, Never>?
+    private var refreshAllTaskGeneration: UInt64 = 0
     private var refreshAllNeedsRerun: Bool = false
+    private var lastRefreshAllCompletedAt: Date = .distantPast
+    private let sidebarAppearRefreshInterval: TimeInterval = 20
+    private let repoListRefreshConcurrency: Int = 4
+    private let gitTrackingRefreshConcurrency: Int = 8
 
     init() {
         load()
@@ -523,7 +535,7 @@ final class WorktrunkStore: ObservableObject {
         save()
         rebuildSidebarSnapshot()
         bumpSidebarModelRevision()
-        Task { await refreshAll() }
+        Task { await refreshAll(trigger: .repositoryAdded) }
     }
 
     func removeRepository(id: UUID) {
@@ -537,23 +549,55 @@ final class WorktrunkStore: ObservableObject {
     }
 
     func refreshAll() async {
+        await refreshAll(trigger: .manual)
+    }
+
+    func refreshForSidebarAppearIfNeeded() async {
+        await refreshAll(trigger: .sidebarAppear)
+    }
+
+    private func refreshAll(trigger: RefreshAllTrigger) async {
+        if trigger == .sidebarAppear, shouldSkipSidebarAppearRefresh() {
+            return
+        }
+
+        let shouldScheduleRerun = shouldScheduleRefreshRerun(for: trigger)
         if let existing = refreshAllTask {
-            refreshAllNeedsRerun = true
+            let observedGeneration = refreshAllTaskGeneration
+            if shouldScheduleRerun {
+                refreshAllNeedsRerun = true
+            }
             await existing.value
-            if refreshAllNeedsRerun {
-                refreshAllNeedsRerun = false
-                await refreshAll()
+
+            // Existing task may be complete but still stored here until its creator resumes.
+            if refreshAllTaskGeneration == observedGeneration {
+                refreshAllTask = nil
+            }
+
+            if shouldScheduleRerun, refreshAllNeedsRerun, refreshAllTask == nil {
+                await startRefreshAllTask()
             }
             return
         }
 
+        await startRefreshAllTask()
+    }
+
+    private func startRefreshAllTask() async {
+        guard refreshAllTask == nil else { return }
+
+        refreshAllTaskGeneration &+= 1
+        let generation = refreshAllTaskGeneration
         let task = Task { [weak self] in
             guard let self else { return }
             await self.refreshAllBatchedLoop()
         }
         refreshAllTask = task
         await task.value
-        refreshAllTask = nil
+
+        if refreshAllTaskGeneration == generation {
+            refreshAllTask = nil
+        }
     }
 
     private struct RefreshListResult {
@@ -573,10 +617,27 @@ final class WorktrunkStore: ObservableObject {
             await refreshAllBatchedOnce()
         } while refreshAllNeedsRerun
         await MainActor.run {
+            lastRefreshAllCompletedAt = Date()
             isRefreshing = false
         }
     }
 
+    private func shouldSkipSidebarAppearRefresh() -> Bool {
+        if refreshAllTask != nil {
+            return false
+        }
+        return Date().timeIntervalSince(lastRefreshAllCompletedAt) < sidebarAppearRefreshInterval
+    }
+
+    private func shouldScheduleRefreshRerun(for trigger: RefreshAllTrigger) -> Bool {
+        switch trigger {
+        case .sidebarAppear:
+            return false
+        case .repositoryAdded, .worktrunkInstalled, .manual:
+            return true
+        }
+    }
+
     private func refreshAllBatchedOnce() async {
         let repoSnapshot = await MainActor.run { repositories }
         let previousByRepoID = await MainActor.run {
@@ -593,7 +654,12 @@ final class WorktrunkStore: ObservableObject {
         results.reserveCapacity(repoSnapshot.count)
 
         await withTaskGroup(of: RefreshListResult.self) { group in
-            for repo in repoSnapshot {
+            var nextRepoIndex = 0
+
+            func enqueueNextRepo() {
+                guard nextRepoIndex < repoSnapshot.count else { return }
+                let repo = repoSnapshot[nextRepoIndex]
+                nextRepoIndex += 1
                 let previous = previousByRepoID[repo.id] ?? (hadExisting: false, paths: Set<String>())
                 group.addTask { [self] in
                     do {
@@ -620,8 +686,13 @@ final class WorktrunkStore: ObservableObject {
                 }
             }
 
-            for await result in group {
+            for _ in 0..<min(repoListRefreshConcurrency, repoSnapshot.count) {
+                enqueueNextRepo()
+            }
+
+            while let result = await group.next() {
                 results.append(result)
+                enqueueNextRepo()
             }
         }
 
@@ -674,8 +745,9 @@ final class WorktrunkStore: ObservableObject {
             repositories.flatMap { worktreesByRepositoryID[$0.id] ?? [] }
         }
 
-        await refreshGitTracking(for: allWorktrees, removing: allPreviousPaths)
-        await refreshSessions()
+        async let trackingRefresh: Void = refreshGitTracking(for: allWorktrees, removing: allPreviousPaths)
+        async let sessionsRefresh: Void = refreshSessions()
+        _ = await (trackingRefresh, sessionsRefresh)
     }
 
     private func decodeWorktrees(repoID: UUID, data: Data) throws -> [Worktree] {
@@ -814,7 +886,7 @@ final class WorktrunkStore: ObservableObject {
                 errorMessage = nil
                 needsWorktrunkInstall = false
             }
-            await refreshAll()
+            await refreshAll(trigger: .worktrunkInstalled)
             return true
         } catch {
             await MainActor.run {
@@ -997,17 +1069,27 @@ final class WorktrunkStore: ObservableObject {
         var results: [String: GitTracking] = [:]
 
         await withTaskGroup(of: (String, GitTracking?).self) { group in
-            for worktree in worktrees {
+            var nextWorktreeIndex = 0
+
+            func enqueueNextWorktree() {
+                guard nextWorktreeIndex < worktrees.count else { return }
+                let worktree = worktrees[nextWorktreeIndex]
+                nextWorktreeIndex += 1
                 group.addTask { [self] in
                     let tracking = try? await getGitTracking(worktreePath: worktree.path)
                     return (worktree.path, tracking)
                 }
             }
 
-            for await (path, tracking) in group {
+            for _ in 0..<min(gitTrackingRefreshConcurrency, worktrees.count) {
+                enqueueNextWorktree()
+            }
+
+            while let (path, tracking) = await group.next() {
                 if let tracking {
                     results[path] = tracking
                 }
+                enqueueNextWorktree()
             }
         }
 
@@ -1033,6 +1115,9 @@ final class WorktrunkStore: ObservableObject {
         let output = try await runGitStatus(worktreePath: worktreePath)
         if output.isEmpty { return nil }
         var parsed = parseGitStatusOutput(output)
+        if parsed.tracking.totalChangesCount == 0 {
+            return parsed.tracking
+        }
 
         let (unstagedAdds, unstagedDeletes) = (try? await runGitNumstat(
             worktreePath: worktreePath,