feature: simple implementation for generating commit message by OpenAI (#456)

src/Views/AIAssistant.axaml.cs

@@ -0,0 +1,61 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Threading;
+
+namespace SourceGit.Views
+{
+    public partial class AIAssistant : ChromelessWindow
+    {
+        public AIAssistant()
+        {
+            _cancel = new CancellationTokenSource();
+            InitializeComponent();
+            ProgressMessage.Text = "Generating commit message... Please wait!";
+        }
+
+        public void GenerateCommitMessage()
+        {
+            if (DataContext is ViewModels.WorkingCopy vm)
+            {
+                Task.Run(() =>
+                {
+                    var message = new Commands.GenerateCommitMessage(vm.RepoPath, vm.Staged, _cancel.Token, SetDescription).Result();
+                    if (_cancel.IsCancellationRequested)
+                        return;
+
+                    Dispatcher.UIThread.Invoke(() =>
+                    {
+                        if (DataContext is ViewModels.WorkingCopy wc)
+                            wc.CommitMessage = message;
+
+                        Close();
+                    });
+                }, _cancel.Token);
+            }
+        }
+
+        protected override void OnClosing(WindowClosingEventArgs e)
+        {
+            base.OnClosing(e);
+            _cancel.Cancel();
+        }
+
+        private void BeginMoveWindow(object _, PointerPressedEventArgs e)
+        {
+            BeginMoveDrag(e);
+        }
+
+        private void SetDescription(string message)
+        {
+            Dispatcher.UIThread.Invoke(() =>
+            {
+                ProgressMessage.Text = message;
+            });
+        }
+
+        private CancellationTokenSource _cancel;
+    }
+}