Send a notification at the end of the run (fix #554)

src/main.rs

@@ -381,7 +381,15 @@ fn run() -> Result<()> {
         }
     }
 
-    if post_command_failed || runner.report().data().iter().any(|(_, result)| result.failed()) {
+    let failed = post_command_failed || runner.report().data().iter().any(|(_, result)| result.failed());
+    terminal::notify_desktop(
+        format!(
+            "Topgrade finished {}",
+            if failed { "with errors" } else { "sucessfully" }
+        ),
+        None,
+    );
+    if failed {
         Err(StepFailed.into())
     } else {
         Ok(())

src/terminal.rs

@@ -296,3 +296,7 @@ pub fn set_desktop_notifications(desktop_notifications: bool) {
 pub fn prompt_yesno(question: &str) -> Result<bool, io::Error> {
     TERMINAL.lock().unwrap().prompt_yesno(question)
 }
+
+pub fn notify_desktop<P: AsRef<str>>(message: P, timeout: Option<Duration>) {
+    TERMINAL.lock().unwrap().notify_desktop(message, timeout)
+}