shell: Let panels have their own commandline flags

Add a class method to CcPanel to get a GOptionGroup which will be added
to the main commandline parser. This gives panels the chance to have
commandline "--flags" in addition to the already available parameters.

This changes changes the way parameters are passed to panels: the first
entry in the GVariant array is always the a{sv} dictionary of
commandline flags, followed by the remaining free-form arguments.

https://bugzilla.gnome.org/show_bug.cgi?id=696054

panels/keyboard/cc-keyboard-panel.c

@@ -91,17 +91,19 @@ cc_keyboard_panel_set_property (GObject      *object,
       page = section = NULL;
       switch (g_variant_n_children (parameters))
         {
-          case 2:
-            g_variant_get_child (parameters, 1, "v", &v);
+          case 3:
+            g_variant_get_child (parameters, 2, "v", &v);
             section = g_variant_get_string (v, NULL);
             g_variant_unref (v);
             /* fall-through */
-          case 1:
-            g_variant_get_child (parameters, 0, "v", &v);
+          case 2:
+            g_variant_get_child (parameters, 1, "v", &v);
             page = g_variant_get_string (v, NULL);
             g_variant_unref (v);
             cc_keyboard_panel_set_page (panel, page, section);
             /* fall-through */
+          case 1:
+            /* No flags expected, fall-through */
           case 0:
             break;
           default:

panels/network/cc-network-panel.c

@@ -173,7 +173,8 @@ variant_av_to_string_array (GVariant *array)
         count = g_variant_iter_init (&iter, array);
         strv = g_ptr_array_sized_new (count + 1);
         while (g_variant_iter_next (&iter, "v", &v)) {
-                g_ptr_array_add (strv, (gpointer *)g_variant_get_string (v, NULL));
+                if (g_variant_is_of_type (v, G_VARIANT_TYPE_STRING))
+                        g_ptr_array_add (strv, (gpointer *)g_variant_get_string (v, NULL));
                 g_variant_unref (v);
         }
         g_ptr_array_add (strv, NULL); /* NULL-terminate the strv data array */

panels/online-accounts/cc-online-accounts-panel.c

@@ -108,12 +108,12 @@ cc_goa_panel_set_property (GObject *object,
           const gchar *first_arg = NULL;
 
           parameters = g_value_get_variant (value);
-          if (parameters == NULL)
+          if (parameters == NULL || g_variant_n_children (parameters) == 0)
             return;
 
-          if (g_variant_n_children (parameters) > 0)
+          if (g_variant_n_children (parameters) > 1)
             {
-                g_variant_get_child (parameters, 0, "v", &v);
+                g_variant_get_child (parameters, 1, "v", &v);
                 if (g_variant_is_of_type (v, G_VARIANT_TYPE_STRING))
                   first_arg = g_variant_get_string (v, NULL);
                 else

panels/sound/cc-sound-panel.c

@@ -56,9 +56,10 @@ cc_sound_panel_set_property (GObject      *object,
                 GVariant *parameters;
 
                 parameters = g_value_get_variant (value);
-                if (parameters && g_variant_n_children (parameters) > 0) {
+                if (parameters && g_variant_n_children (parameters) > 1) {
                         GVariant *v;
-                        g_variant_get_child (parameters, 0, "v", &v);
+                        /* Skip the first child, we don't expect any flag */
+                        g_variant_get_child (parameters, 1, "v", &v);
                         gvc_mixer_dialog_set_page (self->dialog, g_variant_get_string (v, NULL));
                         g_variant_unref (v);
                 }

shell/cc-application.c

@@ -105,18 +105,22 @@ cc_application_command_line (GApplication *application,
   int retval = 0;
   GOptionContext *context;
   GError *error = NULL;
+  GVariantBuilder *flags_builder;
 
   verbose = FALSE;
   show_overview = FALSE;
   show_help = FALSE;
   start_panels = NULL;
 
+  flags_builder = g_variant_builder_new (G_VARIANT_TYPE_VARDICT);
+
   argv = g_application_command_line_get_arguments (command_line, &argc);
 
   context = g_option_context_new (N_("- Settings"));
   g_option_context_add_main_entries (context, all_options, GETTEXT_PACKAGE);
   g_option_context_set_translation_domain(context, GETTEXT_PACKAGE);
   g_option_context_add_group (context, gtk_get_option_group (TRUE));
+  cc_panel_loader_add_option_groups (context, flags_builder);
   g_option_context_set_help_enabled (context, FALSE);
 
   if (g_option_context_parse (context, &argc, &argv, &error) == FALSE)
@@ -192,6 +196,8 @@ cc_application_command_line (GApplication *application,
         g_debug ("No extra argument");
 
       builder = g_variant_builder_new (G_VARIANT_TYPE ("av"));
+      g_variant_builder_add (builder, "v", g_variant_builder_end (flags_builder));
+
       for (i = 1; start_panels[i] != NULL; i++)
         g_variant_builder_add (builder, "v", g_variant_new_string (start_panels[i]));
       parameters = g_variant_builder_end (builder);

shell/cc-panel-loader.c

@@ -215,4 +215,21 @@ cc_panel_loader_load_by_name (CcShell     *shell,
                        NULL);
 }
 
+void
+cc_panel_loader_add_option_groups (GOptionContext  *context,
+                                   GVariantBuilder *builder)
+{
+  int i;
+
+  for (i = 0; i < G_N_ELEMENTS (all_panels); i++)
+    {
+      GType (*get_type) (void);
+      get_type = all_panels[i].get_type;
+      GOptionGroup *group = cc_panel_get_option_group (get_type(), builder);
+      if (group == NULL)
+        continue;
+      g_option_context_add_group (context, group);
+    }
+}
+
 #endif /* CC_PANEL_LOADER_NO_GTYPES */

shell/cc-panel-loader.h

@@ -30,6 +30,8 @@ G_BEGIN_DECLS
 
 void     cc_panel_loader_fill_model     (CcShellModel  *model);
 GList   *cc_panel_loader_get_panels     (void);
+void     cc_panel_loader_add_option_groups (GOptionContext  *context,
+                                            GVariantBuilder *builder);
 CcPanel *cc_panel_loader_load_by_name   (CcShell       *shell,
                                          const char    *name,
                                          GVariant      *parameters);

shell/cc-panel.c

@@ -259,3 +259,15 @@ cc_panel_get_help_uri (CcPanel *panel)
 
   return NULL;
 }
+
+GOptionGroup *
+cc_panel_get_option_group (GType            panel_type,
+                           GVariantBuilder *builder)
+{
+  GOptionGroup *options = NULL;
+  CcPanelClass *class = CC_PANEL_CLASS (g_type_class_ref (panel_type));
+  if (class->get_option_group != NULL)
+    options = class->get_option_group (builder);
+  g_type_class_unref (class);
+  return options;
+}

shell/cc-panel.h

@@ -75,12 +75,16 @@ struct _CcPanelClass
   /*< private >*/
   GtkBinClass parent_class;
 
+  GOptionGroup * (* get_option_group) (GVariantBuilder *builder);
   GPermission * (* get_permission) (CcPanel *panel);
   const char  * (* get_help_uri)   (CcPanel *panel);
 };
 
 GType        cc_panel_get_type         (void);
 
+GOptionGroup *cc_panel_get_option_group (GType            panel_type,
+                                         GVariantBuilder *builder);
+
 CcShell*     cc_panel_get_shell        (CcPanel     *panel);
 
 GPermission *cc_panel_get_permission   (CcPanel     *panel);