[libnotify/wip/notify-error-code] notify-send: Give failing exit code if showing notification fails

[Ray Strode <halfline src gnome org>]

commit 771bbb5b850e0abe404f58feab38215aee2d8a41
Author: Ray Strode <rstrode redhat com>
Date:   Tue May 12 10:12:26 2020 -0400

    notify-send: Give failing exit code if showing notification fails
    
    Right now notify-send will quietly return a successful exit status
    even if showing the notification fails.
    
    This commit changes the behavior to instead fail on failure.
    
    https://gitlab.gnome.org/GNOME/libnotify/-/merge_requests/13

 tools/notify-send.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)
---
diff --git a/tools/notify-send.c b/tools/notify-send.c
index 67e0b03..589fe90 100644
--- a/tools/notify-send.c
+++ b/tools/notify-send.c
@@ -132,7 +132,7 @@ main (int argc, char *argv[])
         static char       **n_text = NULL;
         static char       **hints = NULL;
         static gboolean     do_version = FALSE;
-        static gboolean     hint_error = FALSE;
+        static gboolean     hint_error = FALSE, show_error = FALSE;
         static glong        expire_timeout = NOTIFY_EXPIRES_DEFAULT;
         GOptionContext     *opt_ctx;
         NotifyNotification *notify;
@@ -274,12 +274,19 @@ main (int argc, char *argv[])
                 }
         }
 
-        if (!hint_error)
-                notify_notification_show (notify, NULL);
+        if (!hint_error) {
+                retval = notify_notification_show (notify, &error);
+
+                if (!retval) {
+                        fprintf (stderr, "%s\n", error->message);
+                        g_error_free (error);
+                        show_error = TRUE;
+                }
+        }
 
         g_object_unref (G_OBJECT (notify));
 
         notify_uninit ();
 
-        exit (hint_error);
+        exit (hint_error || show_error);
 }