enhance: secure exit

src/App.axaml.cs

@@ -122,7 +122,7 @@ namespace SourceGit
             Check4Update(true);
         });
 
-        public static readonly SimpleCommand QuitCommand = new SimpleCommand(Quit);
+        public static readonly SimpleCommand QuitCommand = new SimpleCommand(() => Quit(0));
 
         public static void RaiseException(string context, string message)
         {
@@ -315,12 +315,16 @@ namespace SourceGit
             return null;
         }
 
-        public static void Quit()
+        public static void Quit(int exitCode)
         {
             if (Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
             {
                 desktop.MainWindow?.Close();
-                desktop.Shutdown();
+                desktop.Shutdown(exitCode);
+            }
+            else
+            {
+                Environment.Exit(exitCode);
             }
         }
 
@@ -485,9 +489,10 @@ namespace SourceGit
 
             var file = args[1];
             if (!File.Exists(file))
-                Environment.Exit(-1);
+                desktop.Shutdown(-1);
+            else
+                desktop.MainWindow = new Views.StandaloneCommitMessageEditor(file);
 
-            desktop.MainWindow = new Views.StandaloneCommitMessageEditor(file);
             return true;
         }
 

src/ViewModels/Launcher.cs

@@ -153,7 +153,7 @@ namespace SourceGit.ViewModels
                 }
                 else
                 {
-                    App.Quit();
+                    App.Quit(0);
                 }
 
                 return;

src/Views/Askpass.axaml.cs

@@ -50,13 +50,13 @@ namespace SourceGit.Views
         private void CloseWindow(object _1, RoutedEventArgs _2)
         {
             Console.Out.WriteLine("No passphrase entered.");
-            Environment.Exit(-1);
+            App.Quit(-1);
         }
 
         private void EnterPassword(object _1, RoutedEventArgs _2)
         {
             Console.Out.Write($"{Passphrase}\n");
-            Environment.Exit(0);
+            App.Quit(0);
         }
     }
 }

src/Views/StandaloneCommitMessageEditor.axaml.cs

@@ -1,4 +1,3 @@
-using System;
 using System.IO;
 
 using Avalonia.Input;
@@ -41,13 +40,13 @@ namespace SourceGit.Views
 
         private void CloseWindow(object _1, RoutedEventArgs _2)
         {
-            Environment.Exit(-1);
+            App.Quit(-1);
         }
 
         private void SaveAndClose(object _1, RoutedEventArgs _2)
         {
             File.WriteAllText(_file, Editor.Text);
-            Environment.Exit(0);
+            App.Quit(0);
         }
 
         private readonly string _file;