enhance: only refresh submodules when it is needed (#1344)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Models/IRepository.cs

@@ -2,6 +2,8 @@
 {
     public interface IRepository
     {
+        bool MayHaveSubmodules();
+
         void RefreshBranches();
         void RefreshWorktrees();
         void RefreshTags();

src/Models/Remote.cs

@@ -50,7 +50,7 @@ public static bool IsValidURL(string url)
                     return true;
             }
 
-            return url.StartsWith("file://", StringComparison.Ordinal) || 
+            return url.StartsWith("file://", StringComparison.Ordinal) ||
                 url.StartsWith("./", StringComparison.Ordinal) ||
                 url.StartsWith("../", StringComparison.Ordinal) ||
                 Directory.Exists(url);

src/Models/Watcher.cs

@@ -107,18 +107,22 @@ private void Tick(object sender)
             {
                 _updateBranch = 0;
                 _updateWC = 0;
-                _updateSubmodules = 0;
 
                 if (_updateTags > 0)
                 {
                     _updateTags = 0;
                     Task.Run(_repo.RefreshTags);
                 }
 
+                if (_updateSubmodules > 0 || _repo.MayHaveSubmodules())
+                {
+                    _updateSubmodules = 0;
+                    Task.Run(_repo.RefreshSubmodules);
+                }
+
                 Task.Run(_repo.RefreshBranches);
                 Task.Run(_repo.RefreshCommits);
                 Task.Run(_repo.RefreshWorkingCopyChanges);
-                Task.Run(_repo.RefreshSubmodules);
                 Task.Run(_repo.RefreshWorktrees);
             }
 
@@ -150,12 +154,13 @@ private void Tick(object sender)
 
         private void OnRepositoryChanged(object o, FileSystemEventArgs e)
         {
-            if (string.IsNullOrEmpty(e.Name) || e.Name.EndsWith(".lock", StringComparison.Ordinal))
+            if (string.IsNullOrEmpty(e.Name))
                 return;
 
             var name = e.Name.Replace("\\", "/");
-
-            if (name.Contains("fsmonitor--daemon/", StringComparison.Ordinal))
+            if (name.Contains("fsmonitor--daemon/", StringComparison.Ordinal) ||
+                name.EndsWith(".lock", StringComparison.Ordinal) ||
+                name.StartsWith("lfs/", StringComparison.Ordinal))
                 return;
 
             if (name.StartsWith("modules", StringComparison.Ordinal))
@@ -170,8 +175,8 @@ private void OnRepositoryChanged(object o, FileSystemEventArgs e)
             else if (name.Equals("MERGE_HEAD", StringComparison.Ordinal) ||
                 name.Equals("AUTO_MERGE", StringComparison.Ordinal))
             {
-                _updateSubmodules = DateTime.Now.AddSeconds(1).ToFileTime();
-                _updateWC = DateTime.Now.AddSeconds(1).ToFileTime();
+                if (_repo.MayHaveSubmodules())
+                    _updateSubmodules = DateTime.Now.AddSeconds(1).ToFileTime();
             }
             else if (name.StartsWith("refs/tags", StringComparison.Ordinal))
             {
@@ -201,13 +206,12 @@ private void OnWorkingCopyChanged(object o, FileSystemEventArgs e)
                 return;
 
             var name = e.Name.Replace("\\", "/");
-
             if (name.Equals(".git", StringComparison.Ordinal) ||
                 name.StartsWith(".git/", StringComparison.Ordinal) ||
                 name.EndsWith("/.git", StringComparison.Ordinal))
                 return;
 
-            if (name.StartsWith(".vs/", StringComparison.Ordinal) && name.EndsWith("/.suo", StringComparison.Ordinal))
+            if (name.StartsWith(".vs/", StringComparison.Ordinal))
                 return;
 
             if (name.Equals(".gitmodules", StringComparison.Ordinal))

src/ViewModels/Repository.cs

@@ -1093,6 +1093,13 @@ public void Bisect(string subcmd)
             });
         }
 
+        public bool MayHaveSubmodules()
+        {
+            var modulesFile = Path.Combine(_fullpath, ".gitmodules");
+            var info = new FileInfo(modulesFile);
+            return info.Exists && info.Length > 20;
+        }
+
         public void RefreshBranches()
         {
             var branches = new Commands.QueryBranches(_fullpath).Result(out var localBranchesCount);
@@ -1196,13 +1203,54 @@ public void RefreshCommits()
 
         public void RefreshSubmodules()
         {
+            if (!MayHaveSubmodules())
+            {
+                if (_submodules.Count > 0)
+                {
+                    Dispatcher.UIThread.Invoke(() =>
+                    {
+                        Submodules = [];
+                        VisibleSubmodules = BuildVisibleSubmodules();
+                    });
+                }
+
+                return;
+            }
+
             var submodules = new Commands.QuerySubmodules(_fullpath).Result();
             _watcher?.SetSubmodules(submodules);
 
             Dispatcher.UIThread.Invoke(() =>
             {
-                Submodules = submodules;
-                VisibleSubmodules = BuildVisibleSubmodules();
+                bool hasChanged = _submodules.Count != submodules.Count;
+                if (!hasChanged)
+                {
+                    var old = new Dictionary<string, Models.Submodule>();
+                    foreach (var module in _submodules)
+                        old.Add(module.Path, module);
+
+                    foreach (var module in submodules)
+                    {
+                        if (!old.TryGetValue(module.Path, out var exist))
+                        {
+                            hasChanged = true;
+                            break;
+                        }
+
+                        hasChanged = !exist.SHA.Equals(module.SHA, StringComparison.Ordinal) ||
+                            !exist.URL.Equals(module.URL, StringComparison.Ordinal) ||
+                            exist.Status != module.Status;
+
+                        if (hasChanged)
+                            break;
+                    }
+                }
+
+                if (hasChanged)
+                {
+                    Submodules = submodules;
+                    VisibleSubmodules = BuildVisibleSubmodules();
+                }
             });
         }