feature: warn when creating commit on a detached HEAD (#1462)

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

Author: love-linger

src/Resources/Locales/en_US.axaml

@@ -793,6 +793,7 @@
   <x:String x:Key="Text.WorkingCopy.CommitTip" xml:space="preserve">Trigger click event</x:String>
   <x:String x:Key="Text.WorkingCopy.CommitToEdit" xml:space="preserve">Commit (Edit)</x:String>
   <x:String x:Key="Text.WorkingCopy.CommitWithAutoStage" xml:space="preserve">Stage all changes and commit</x:String>
+  <x:String x:Key="Text.WorkingCopy.ConfirmCommitWithDetachedHead">You are creating commit on a detached HEAD. Do you want to continue?</x:String>
   <x:String x:Key="Text.WorkingCopy.ConfirmCommitWithFilter">You have staged {0} file(s) but only {1} file(s) displayed ({2} files are filtered out). Do you want to continue?</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts" xml:space="preserve">CONFLICTS DETECTED</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts.OpenExternalMergeTool" xml:space="preserve">OPEN EXTERNAL MERGETOOL</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -797,6 +797,7 @@
   <x:String x:Key="Text.WorkingCopy.CommitTip" xml:space="preserve">触发点击事件</x:String>
   <x:String x:Key="Text.WorkingCopy.CommitToEdit" xml:space="preserve">提交（修改原始提交）</x:String>
   <x:String x:Key="Text.WorkingCopy.CommitWithAutoStage" xml:space="preserve">自动暂存所有变更并提交</x:String>
+  <x:String x:Key="Text.WorkingCopy.ConfirmCommitWithDetachedHead">您正在向一个游离的 HEAD 提交变更，是否继续提交？</x:String>
   <x:String x:Key="Text.WorkingCopy.ConfirmCommitWithFilter" xml:space="preserve">当前有 {0} 个文件在暂存区中，但仅显示了 {1} 个文件（{2} 个文件被过滤掉了），是否继续提交？</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts" xml:space="preserve">检测到冲突</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts.OpenExternalMergeTool" xml:space="preserve">打开合并工具</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -797,6 +797,7 @@
   <x:String x:Key="Text.WorkingCopy.CommitTip" xml:space="preserve">觸發點擊事件</x:String>
   <x:String x:Key="Text.WorkingCopy.CommitToEdit" xml:space="preserve">提交 (修改原始提交)</x:String>
   <x:String x:Key="Text.WorkingCopy.CommitWithAutoStage" xml:space="preserve">自動暫存全部變更並提交</x:String>
+  <x:String x:Key="Text.WorkingCopy.ConfirmCommitWithDetachedHead">您正在向一个分離狀態的 HEAD 提交變更，您確定要繼續提交嗎?</x:String>
   <x:String x:Key="Text.WorkingCopy.ConfirmCommitWithFilter" xml:space="preserve">您已暫存 {0} 個檔案，但只顯示 {1} 個檔案 ({2} 個檔案被篩選器隱藏)。您確定要繼續提交嗎?</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts" xml:space="preserve">偵測到衝突</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts.OpenExternalMergeTool" xml:space="preserve">使用外部合併工具開啟</x:String>

src/ViewModels/WorkingCopy.cs

@@ -261,7 +261,6 @@ public void SetData(List<Models.Change> changes)
             }
 
             _cached = changes;
-            _count = _cached.Count;
 
             var lastSelectedUnstaged = new HashSet<string>();
             var lastSelectedStaged = new HashSet<string>();
@@ -1782,7 +1781,7 @@ private void SetDetail(Models.Change change, bool isUnstaged)
                 DetailContext = new DiffContext(_repo.FullPath, new Models.DiffOption(change, isUnstaged), _detailContext as DiffContext);
         }
 
-        private void DoCommit(bool autoStage, bool autoPush, bool allowEmpty = false, bool confirmWithFilter = false)
+        private void DoCommit(bool autoStage, bool autoPush, CommitCheckPassed checkPassed = CommitCheckPassed.None)
         {
             if (string.IsNullOrWhiteSpace(_commitMessage))
                 return;
@@ -1793,18 +1792,25 @@ private void DoCommit(bool autoStage, bool autoPush, bool allowEmpty = false, bo
                 return;
             }
 
-            if (!string.IsNullOrEmpty(_filter) && _staged.Count > _visibleStaged.Count && !confirmWithFilter)
+            if (_repo.CurrentBranch is { IsDetachedHead: true } && checkPassed < CommitCheckPassed.DetachedHead)
             {
-                var confirmMessage = App.Text("WorkingCopy.ConfirmCommitWithFilter", _staged.Count, _visibleStaged.Count, _staged.Count - _visibleStaged.Count);
-                App.ShowWindow(new ConfirmCommit(confirmMessage, () => DoCommit(autoStage, autoPush, allowEmpty, true)), true);
+                var msg = App.Text("WorkingCopy.ConfirmCommitWithDetachedHead");
+                App.ShowWindow(new ConfirmCommit(msg, () => DoCommit(autoStage, autoPush, CommitCheckPassed.DetachedHead)), true);
                 return;
             }
 
-            if (!_useAmend && !allowEmpty)
+            if (!string.IsNullOrEmpty(_filter) && _staged.Count > _visibleStaged.Count && checkPassed < CommitCheckPassed.Filter)
             {
-                if ((autoStage && _count == 0) || (!autoStage && _staged.Count == 0))
+                var msg = App.Text("WorkingCopy.ConfirmCommitWithFilter", _staged.Count, _visibleStaged.Count, _staged.Count - _visibleStaged.Count);
+                App.ShowWindow(new ConfirmCommit(msg, () => DoCommit(autoStage, autoPush, CommitCheckPassed.Filter)), true);
+                return;
+            }
+
+            if (checkPassed < CommitCheckPassed.FileCount && !_useAmend)
+            {
+                if ((!autoStage && _staged.Count == 0) || (autoStage && _cached.Count == 0))
                 {
-                    App.ShowWindow(new ConfirmEmptyCommit(_count > 0, stageAll => DoCommit(stageAll, autoPush, true, confirmWithFilter)), true);
+                    App.ShowWindow(new ConfirmEmptyCommit(_cached.Count > 0, stageAll => DoCommit(stageAll, autoPush, CommitCheckPassed.FileCount)), true);
                     return;
                 }
             }
@@ -1871,6 +1877,14 @@ private bool IsChanged(List<Models.Change> old, List<Models.Change> cur)
             return false;
         }
 
+        private enum CommitCheckPassed
+        {
+            None = 0,
+            DetachedHead,
+            Filter,
+            FileCount,
+        }
+
         private Repository _repo = null;
         private bool _isLoadingData = false;
         private bool _isStaging = false;
@@ -1886,7 +1900,6 @@ private bool IsChanged(List<Models.Change> old, List<Models.Change> cur)
         private List<Models.Change> _visibleStaged = [];
         private List<Models.Change> _selectedUnstaged = [];
         private List<Models.Change> _selectedStaged = [];
-        private int _count = 0;
         private object _detailContext = null;
         private string _filter = string.Empty;
         private string _commitMessage = string.Empty;