Basic emergency save on tool crashes

UndertaleModTool/MainWindow.xaml.cs

@@ -752,17 +752,25 @@ public async Task<bool> DoOpenDialog()
             }
             return false;
         }
-        public async Task<bool> DoSaveDialog(bool suppressDebug = false)
+        public async Task<bool> DoSaveDialog(bool suppressDebug = false, bool isEmergency = false)
         {
+            if (isEmergency && (Data is null || FilePath is null || Data.UnsupportedBytecodeVersion))
+            {
+                return false;
+            }
             SaveFileDialog dlg = new SaveFileDialog();
 
             dlg.DefaultExt = "win";
             dlg.Filter = "GameMaker data files (.win, .unx, .ios, .droid, audiogroup*.dat)|*.win;*.unx;*.ios;*.droid;audiogroup*.dat|All files|*";
             dlg.FileName = FilePath;
+            if (isEmergency)
+            {
+                dlg.Title = "Emergency-save the current file (separate file recommended):";
+            }
 
             if (dlg.ShowDialog(this) == true)
             {
-                await SaveFile(dlg.FileName, suppressDebug);
+                await SaveFile(dlg.FileName, suppressDebug, isEmergency);
                 return true;
             }
             return false;
@@ -1129,7 +1137,7 @@ private async Task LoadFile(string filename, bool preventClose = false, bool onl
             GC.Collect();
         }
 
-        private async Task SaveFile(string filename, bool suppressDebug = false)
+        private async Task SaveFile(string filename, bool suppressDebug = false, bool isEmergency = false)
         {
             if (Data == null || Data.UnsupportedBytecodeVersion)
                 return;
@@ -1273,8 +1281,9 @@ private async Task SaveFile(string filename, bool suppressDebug = false)
                     else
                     {
                         // It failed, but since we made a temp file for saving, no data was overwritten or destroyed (hopefully)
-                        // We need to delete the temp file though (if it exists).
-                        if (File.Exists(filename + "temp"))
+                        // We need to delete the temp file though (if it exists),
+                        // except for emergency saves for possible data recovery.
+                        if (!isEmergency && File.Exists(filename + "temp"))
                             File.Delete(filename + "temp");
                         // No profile system changes, since the save failed, like a save was never attempted.
                     }
@@ -1293,7 +1302,9 @@ private async Task SaveFile(string filename, bool suppressDebug = false)
 
                 Dispatcher.Invoke(() =>
                 {
-                    dialog.Hide();
+                    dialog.Hide();
+                    if (isEmergency && SaveSucceeded)
+                        this.ShowMessage("Emergency save successful.");
                 });
             });
             dialog.ShowDialog();
@@ -1630,7 +1641,7 @@ private async void CommandBox_PreviewKeyDown(object sender, KeyEventArgs e)
                     result = await CSharpScript.EvaluateAsync(CommandBox.Text, scriptOptions, this, typeof(IScriptInterface));
                 }
                 catch (CompilationErrorException exc)
-                {
+                {
                     result = exc.Message;
                     Debug.WriteLine(exc);
                 }

UndertaleModTool/Program.cs

@@ -40,6 +40,9 @@
             {
                 File.WriteAllText(Path.Combine(GetExecutableDirectory(), "crash.txt"), e.ToString());
                 MessageBox.Show(e.ToString());
+                if (Application.Current.MainWindow is MainWindow mw) {
+                    mw.DoSaveDialog(false, true);
+                }
             }
         }
         private static void GlobalUnhandledExceptionHandler(object sender, UnhandledExceptionEventArgs e)