def show!
      notify_init(app_name) or raise "notify_init failed"
      raw_ptr = notify_notification_new(summary, body, icon_path, nil)
      @notification = ::FFI::AutoPointer.new(raw_ptr, method(:g_object_unref))
      show
    end
def show!
      notify_init(app_name) or raise "notify_init failed"
      raw_ptr = notify_notification_new(summary, body, icon_path, nil)
      @notification = ::FFI::AutoPointer.new(raw_ptr, method(:g_object_unref))
      show
    end
Shows a new notification.

 @see Libnotify.show