Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/help/src/Controller/HelpController.php

@@ -0,0 +1,154 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\help\Controller\HelpController.
+ */
+
+namespace Drupal\help\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Drupal\Component\Utility\SafeMarkup;
+
+/**
+ * Controller routines for help routes.
+ */
+class HelpController extends ControllerBase {
+
+  /**
+   * The current route match.
+   *
+   * @var \Drupal\Core\Routing\RouteMatchInterface
+   */
+  protected $routeMatch;
+
+  /**
+   * Creates a new HelpController.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The current route match.
+   */
+  public function __construct(RouteMatchInterface $route_match) {
+    $this->routeMatch = $route_match;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('current_route_match')
+    );
+  }
+
+  /**
+   * Prints a page listing a glossary of Drupal terminology.
+   *
+   * @return string
+   *   An HTML string representing the contents of help page.
+   */
+  public function helpMain() {
+    $output = array(
+      '#markup' => '<h2>' . $this->t('Help topics') . '</h2><p>' . $this->t('Help is available on the following items:') . '</p>',
+      'links' => $this->helpLinksAsList(),
+    );
+    return $output;
+  }
+
+  /**
+   * Provides a formatted list of available help topics.
+   *
+   * @return string
+   *   A string containing the formatted list.
+   */
+  protected function helpLinksAsList() {
+    $modules = array();
+    foreach ($this->moduleHandler()->getImplementations('help') as $module) {
+      $modules[$module] = $this->moduleHandler->getName($module);
+    }
+    asort($modules);
+
+    // Output pretty four-column list.
+    $count = count($modules);
+    $break = ceil($count / 4);
+    $column = array(
+      '#type' => 'container',
+      'links' => array('#theme' => 'item_list'),
+      '#attributes' => array('class' => array('layout-column', 'quarter')),
+    );
+    $output = array(
+      '#prefix' => '<div class="clearfix">',
+      '#suffix' => '</div>',
+      0 => $column,
+    );
+
+    $i = 0;
+    $current_column = 0;
+    foreach ($modules as $module => $name) {
+      $output[$current_column]['links']['#items'][] = $this->l($name, new Url('help.page', array('name' => $module)));
+      if (($i + 1) % $break == 0 && ($i + 1) != $count) {
+        $current_column++;
+        $output[$current_column] = $column;
+      }
+      $i++;
+    }
+
+    return $output;
+  }
+
+  /**
+   * Prints a page listing general help for a module.
+   *
+   * @param string $name
+   *   A module name to display a help page for.
+   *
+   * @return array
+   *   A render array as expected by drupal_render().
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   */
+  public function helpPage($name) {
+    $build = array();
+    if ($this->moduleHandler()->implementsHook($name, 'help')) {
+      $module_name =  $this->moduleHandler()->getName($name);
+      $build['#title'] = SafeMarkup::checkPlain($module_name);
+
+      $temp = $this->moduleHandler()->invoke($name, 'help', array("help.page.$name", $this->routeMatch));
+      if (empty($temp)) {
+        $build['top']['#markup'] = $this->t('No help is available for module %module.', array('%module' => $module_name));
+      }
+      else {
+        $build['top']['#markup'] = $temp;
+      }
+
+      // Only print list of administration pages if the module in question has
+      // any such pages associated to it.
+      $admin_tasks = system_get_module_admin_tasks($name, system_get_info('module', $name));
+      if (!empty($admin_tasks)) {
+        $links = array();
+        foreach ($admin_tasks as $task) {
+          $link['url'] = $task['url'];
+          $link['title'] = $task['title'];
+          $links[] = $link;
+        }
+        $build['links'] = array(
+          '#theme' => 'links__help',
+          '#heading' => array(
+            'level' => 'h3',
+            'text' => $this->t('@module administration pages', array('@module' => $module_name)),
+          ),
+          '#links' => $links,
+        );
+      }
+      return $build;
+    }
+    else {
+      throw new NotFoundHttpException();
+    }
+  }
+
+}