[libnotify] notify-send: Check for notification server actions capability support

[Marco Trevisan <marcotrevi src gnome org>]

commit 12d4b906233bed616d54535051e2263716285fac
Author: Ben Blain <mail servc eu>
Date:   Tue Mar 9 15:44:46 2021 +0000

    notify-send: Check for notification server actions capability support

 tools/notify-send.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)
---
diff --git a/tools/notify-send.c b/tools/notify-send.c
index bf31894..7fd9efe 100644
--- a/tools/notify-send.c
+++ b/tools/notify-send.c
@@ -313,11 +313,27 @@ main (int argc, char *argv[])
         }
 
         if (actions != NULL) {
+                GList *server_caps = notify_get_server_caps ();
                 gint i = 0;
                 char *action = NULL;
                 gchar **spl = NULL;
+                gboolean have_actions;
+
+                have_actions =
+                        !!g_list_find_custom (server_caps,
+                                              "actions",
+                                              (GCompareFunc) g_ascii_strcasecmp);
+                g_list_foreach (server_caps, (GFunc) g_free, NULL);
+                g_list_free (server_caps);
+
+                if (!have_actions) {
+                        g_printerr (N_("Actions are not supported by this "
+                                       "notifications server. "
+                                       "Displaying non-interactively.\n"));
+                        show_error = TRUE;
+                }
 
-                while ((action = actions[i++])) {
+                while (have_actions && (action = actions[i++])) {
                         gchar *name;
                         const gchar *label;