/**
  * Load shortcodes already provided by this plugin.
  */
 protected function loadShortcodes()
 {
     $iterator = new \FilesystemIterator(__DIR__ . '/Shortcodes');
     foreach ($iterator as $fileinfo) {
         $name = $fileinfo->getBasename('.php');
         // Load shortcodes in directory "Shortcodes"
         $class = __NAMESPACE__ . "\\Shortcodes\\{$name}";
         $defaults = $this->config->get('plugins.shortcodes.shortcodes.' . strtolower($name), []);
         if (empty($defaults) || $defaults['enabled']) {
             $options = isset($defaults['options']) ? $defaults['options'] : [];
             $shortcode = new $class($options);
             $this->register($shortcode);
         }
     }
     // Fire event
     self::getGrav()->fireEvent('onShortcodesInitialized', new Event(['shortcodes' => $this]));
     $this->shortcodes = $this->twig->getShortcodes();
     return array_keys($this->shortcodes);
 }