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 $extension_list_module
     *   The module extension list.
     */
    public function __construct(ModuleExtensionList $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() {
        $extensions = array_intersect_key($this->moduleExtensionList
            ->getList(), $this->moduleHandler()
            ->getModuleList());
        uasort($extensions, [
            ModuleExtensionList::class,
            'sortByName',
        ]);
        $menu_items = [];
        foreach ($extensions as $module => $extension) {
            // Only display a section if there are any available tasks.
            if ($admin_tasks = system_get_module_admin_tasks($module, $extension->info)) {
                // Sort links by title.
                uasort($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;
                }
                $menu_items[$extension->info['name']] = [
                    $extension->info['description'],
                    $admin_tasks,
                ];
            }
        }
        $output = [
            '#theme' => 'system_admin_index',
            '#menu_items' => $menu_items,
        ];
        return $output;
    }

}