Automatically save upon exiting application

writeas/AppDelegate.swift

@@ -23,7 +23,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
     }
 
     func applicationWillTerminate(_ aNotification: Notification) {
-        // Insert code here to tear down your application
+        vc?.saveDocument()
     }
     
     func applicationDidBecomeActive(_ notification: Notification) {