function HelpTopicPluginManager::getDiscovery

Overrides DefaultPluginManager::getDiscovery

File

core/modules/help/src/HelpTopicPluginManager.php, line 109

Class

HelpTopicPluginManager

Provides the default help_topic manager.

Namespace

Code

protected function getDiscovery() {
  if (!isset($this->discovery)) {
    $module_directories = $this->moduleHandler
      ->getModuleDirectories();
    $all_directories = array_merge([
      'core' => $this->root . '/core',
    ], $module_directories, $this->themeHandler
      ->getThemeDirectories());
    // Search for Twig help topics in subdirectory help_topics, under
    // modules/profiles, themes, and the core directory.
    $all_directories = array_map(function ($dir) {
      return [
        $dir . '/help_topics',
      ];
    }, $all_directories);
    $discovery = new HelpTopicDiscovery($all_directories);
    // Also allow modules/profiles to extend help topic discovery to their
    // own plugins and derivers, in my_module.help_topics.yml files.
    $discovery = new YamlDiscoveryDecorator($discovery, 'help_topics', $module_directories);
    $discovery = new ContainerDerivativeDiscoveryDecorator($discovery);
    $this->discovery = $discovery;
  }
  return $this->discovery;
}