function register_widgets()
 {
     foreach ($this->widget_groups as $key => $widget_group_settings) {
         if (!WPHF::element('id', $widget_group_settings)) {
             $widget_group_settings['id'] = WPHF::dash($key);
         }
         $this->widget_groups[$key] = new MY_Theme_Widget_Group($widget_group_settings);
     }
     $widgets = WPHF::directory_map(self::$widgets_path, FALSE, array('php'));
     // non-recursive
     foreach ($widgets as $key => $widget_file) {
         $widget_path = WPHF::d_path(array(self::$widgets_path, $widget_file));
         // class.name-sub-sub.php -> MY_Name_Sub_Sub_Widget
         $widget_class = WPHF::underscore(preg_replace('/^(?:(?:class|abstract|functions)[-_.])?/i', 'MY_', basename($widget_file, '.php')), FALSE, FALSE, TRUE);
         // lower, path, camel
         $widgets[$key] = $widget_class;
         require $widget_path;
     }
     foreach ($widgets as $widget_class) {
         // do not instantiate 'abstract' classes
         if (preg_match('/_Base$/', $widget_class) == 0) {
             register_widget($widget_class);
         }
     }
 }