AdminController.php

<?php

namespace Drupal\system\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Extension\ModuleExtensionList;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Controller for admin section.
 */
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;
    }

}