[gtk+] Add a --version option to gtk3-demo

[Matthias Clasen <matthiasc src gnome org>]

commit ac95470c0196feec1f2353425460d676a669a896
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Sep 11 11:04:40 2016 -0400

    Add a --version option to gtk3-demo
    
    This was missing, for no good reason.

 demos/gtk-demo/main.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/main.c b/demos/gtk-demo/main.c
index 923030f..616c33f 100644
--- a/demos/gtk-demo/main.c
+++ b/demos/gtk-demo/main.c
@@ -1144,6 +1144,33 @@ out:
   return 0;
 }
 
+static void
+print_version (void)
+{
+  g_print ("gtk3-demo %d.%d.%d\n",
+           gtk_get_major_version (),
+           gtk_get_minor_version (),
+           gtk_get_micro_version ());
+}
+
+static int
+local_options (GApplication *app,
+               GVariantDict *options,
+               gpointer      data)
+{
+  gboolean version = FALSE;
+
+  g_variant_dict_lookup (options, "version", "b", &version);
+
+  if (version)
+    {
+      print_version ();
+      return 0;
+    }
+
+  return -1;
+}
+
 int
 main (int argc, char **argv)
 {
@@ -1169,6 +1196,7 @@ main (int argc, char **argv)
                                    app_entries, G_N_ELEMENTS (app_entries),
                                    app);
 
+  g_application_add_main_option (G_APPLICATION (app), "version", 0, 0, G_OPTION_ARG_NONE, "Show program 
version", NULL);
   g_application_add_main_option (G_APPLICATION (app), "run", 0, 0, G_OPTION_ARG_STRING, "Run an example", 
"EXAMPLE");
   g_application_add_main_option (G_APPLICATION (app), "list", 0, 0, G_OPTION_ARG_NONE, "List examples", 
NULL);
   g_application_add_main_option (G_APPLICATION (app), "autoquit", 0, 0, G_OPTION_ARG_NONE, "Quit after a 
delay", NULL);
@@ -1176,6 +1204,7 @@ main (int argc, char **argv)
   g_signal_connect (app, "startup", G_CALLBACK (startup), NULL);
   g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
   g_signal_connect (app, "command-line", G_CALLBACK (command_line), NULL);
+  g_signal_connect (app, "handle-local-options", G_CALLBACK (local_options), NULL);
 
   g_application_run (G_APPLICATION (app), argc, argv);