workbench_tabs.module

<?php
/**
 * @file
 * Drupal hooks.
 */

/**
 * Implements hook_theme().
 */
function workbench_tabs_theme() {
  return [
    'workbench_tabs' => [
      'render element' => 'element',
    ],
    'workbench_tabs_menu_local_task' => [
      'render element' => 'element',
    ],
    'workbench_tabs_menu_local_tasks' => [
      'variables' => ['primary' => NULL, 'secondary' => NULL],
    ],
    'workbench_tabs_status_messages' => [
      'variables' => ['status_headings' => [], 'message_list' => NULL],
    ],
  ];
}

/**
 * Preprocess variables for the workbench_tabs_menu_local_task template.
 *
 * Wraps the core menu_local_task preprocess function.
 *
 * @ingroup themeable
 */
function template_preprocess_workbench_tabs_menu_local_task(&$variables) {
  template_preprocess_menu_local_task($variables);
}

/**
 * Preprocess variables for the workbench tabs template.
 *
 * @ingroup themeable
 */
function template_preprocess_workbench_tabs(&$variables) {
  $element = $variables['element'];

  $variables['messages'] = Drupal::service('renderer')->render($element['messages']);
  $variables['tabs'] = Drupal::service('renderer')->render($element['tabs']);

  $variables['has_messages'] = !empty($variables['messages']);
  $variables['has_tabs'] = !empty($element['tabs']['#primary']);
}

/**
 * Implements hook_page_top().
 */
function workbench_tabs_page_top(array &$page_top) {
  $account = \Drupal::currentUser();

  $page_top['workbench_tabs'] = [
    '#theme' => 'workbench_tabs',
    '#access' => $account->hasPermission('use workbench_tabs'),
  ];

  $page_top['workbench_tabs']['messages'] = [
    '#type' => 'workbench_tabs_status_messages',
    '#cache' => [
      'contexts' => [
        'url.path',
        'user.roles',
      ],
    ],
  ];

  $page_top['workbench_tabs']['tabs'] = [
    '#type' => 'workbench_tabs_local_tasks',
  ];
}