class AdminController

class AdminController extends ControllerBase {
  
  /**
   * The module extension list.
   *
   * @var \Drupal\Core\Extension\ModuleExtensionList
   */
  protected $moduleExtensionList;
  
  /**
   * AdminController constructor.
   *
   * @param \Drupal\Core\Extension\ModuleExtensionList|null $extension_list_module
   *   The module extension list. This is left optional for BC reasons, but the
   *   optional usage is deprecated and will become required in Drupal 9.0.0.
   */
  public function __construct(ModuleExtensionList $extension_list_module = NULL) {
    if ($extension_list_module === NULL) {
      @trigger_error('Calling AdminController::__construct() with the $module_extension_list argument is supported in drupal:8.8.0 and will be required before drupal:9.0.0. See https://www.drupal.org/node/2709919.', E_USER_DEPRECATED);
      $extension_list_module = \Drupal::service('extension.list.module');
    }
    $this->moduleExtensionList = $extension_list_module;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('extension.list.module'));
  }
  
  /**
   * Prints a listing of admin tasks, organized by module.
   *
   * @return array
   *   A render array containing the listing.
   */
  public function index() {
    $module_info = $this->moduleExtensionList
      ->getAllInstalledInfo();
    foreach ($module_info as $module => $info) {
      $module_info[$module] = new \stdClass();
      $module_info[$module]->info = $info;
    }
    uasort($module_info, 'system_sort_modules_by_info_name');
    $menu_items = [];
    foreach ($module_info as $module => $info) {
      // Only display a section if there are any available tasks.
      if ($admin_tasks = system_get_module_admin_tasks($module, $info->info)) {
        // Sort links by title.
        uasort($admin_tasks, [
          '\\Drupal\\Component\\Utility\\SortArray',
          'sortByTitleElement',
        ]);
        // Move 'Configure permissions' links to the bottom of each section.
        $permission_key = "user.admin_permissions.{$module}";
        if (isset($admin_tasks[$permission_key])) {
          $permission_task = $admin_tasks[$permission_key];
          unset($admin_tasks[$permission_key]);
          $admin_tasks[$permission_key] = $permission_task;
        }
        $menu_items[$info->info['name']] = [
          $info->info['description'],
          $admin_tasks,
        ];
      }
    }
    $output = [
      '#theme' => 'system_admin_index',
      '#menu_items' => $menu_items,
    ];
    return $output;
  }

}