actions: add a get_action! macro

src/lib.rs

@@ -43,3 +43,24 @@ macro_rules! stateful_action {
         $actions_group.add_action(&simple_action);
     };
 }
+
+
+#[macro_export]
+macro_rules! get_action {
+    ($actions:expr, @$name:ident) => {{
+        let $name = $actions
+            .lookup_action(stringify!($name))
+            .expect(&format!("Could not find action \"{}\"", stringify!($name)))
+            .downcast::<gio::SimpleAction>()
+            .unwrap();
+        $name
+    }};
+
+    ($actions:expr, $name:ident) => {
+        let $name: gio::SimpleAction = $actions
+            .lookup_action(stringify!($name))
+            .expect(&format!("Could not find action \"{}\"", stringify!($name)))
+            .downcast::<gio::SimpleAction>()
+            .unwrap();
+    };
+}