Club Drupal

<?php

/**

 * @file

 * Stub file for "book_navigation" theme hook [pre]process functions.

 */

/**

 * Pre-processes variables for the "book_navigation" theme hook.

 *

 * See template for list of available variables.

 *

 * @see book-navigation.tpl.php

 *

 * @ingroup theme_preprocess

 */

function bootstrap_preprocess_book_navigation(&$variables) {

  $variables['tree'] = _bootstrap_book_children($variables['book_link']);

}

/**

 * Formats the menu links for the child pages of the current page.

 *

 * @param array $book_link

 *   A fully loaded menu link that is part of the book hierarchy.

 *

 * @return string

 *   HTML for the links to the child pages of the current page.

 */

function _bootstrap_book_children($book_link) {

  // Rebuild entire menu tree for the book.

  $tree = menu_build_tree($book_link['menu_name']);

  $tree = menu_tree_output($tree);

  // Fix the theme hook suggestions.

  _bootstrap_book_fix_theme_hooks($book_link['nid'], $tree);

  // Return the rendered output.

  return drupal_render($tree);

}

/**

 * Helper function to fix theme hooks in book TOC menus.

 *

 * @param int $bid

 *   The book identification number.

 * @param array $element

 *   The element to iterate over, passed by reference.

 * @param int $level

 *   Used internally to determine the current level of the menu.

 */

function _bootstrap_book_fix_theme_hooks($bid, array &$element, $level = 0) {

  $hook = $level === 0 ? $bid : 'sub_menu__' . $bid;

  $element['#theme_wrappers'] = array('menu_tree__book_toc__' . $hook);

  foreach (element_children($element) as $child) {

    $element[$child]['#theme'] = 'menu_link__book_toc__' . $hook;

    // Iterate through all child menu items as well.

    if (!empty($element[$child]['#below'])) {

      _bootstrap_book_fix_theme_hooks($bid, $element[$child]['#below'], ($level + 1));

    }

  }

}