function book_helper_preprocess_book_navigation in Book helper 6

Same name and namespace in other branches

1. 7 book_helper.module \book_helper_preprocess_book_navigation()

Override; Process variables for book-navigation.tpl.php.

File

./book_helper.module, line 287

Improves Drupal's core book module's functionality.

Code

function book_helper_preprocess_book_navigation(&$variables) {
  $navigation_options = variable_get('book_helper_navigation_options', array(
    'tree',
    'prev',
    'next',
    'up',
  ));

  // Below code is copied from template_preprocess_book_navigation();
  $book_link = $variables['book_link'];

  // Provide extra variables for themers. Not needed by default.
  $variables['book_id'] = $book_link['bid'];
  $variables['book_title'] = check_plain($book_link['link_title']);
  $variables['book_url'] = 'node/' . $book_link['bid'];
  $variables['current_depth'] = $book_link['depth'];
  $variables['tree'] = '';
  if ($book_link['mlid']) {
    if (in_array('tree', $navigation_options)) {
      $variables['tree'] = book_children($book_link);
    }
    if (in_array('prev', $navigation_options) && ($prev = book_prev($book_link))) {
      $prev_href = url($prev['href']);
      drupal_add_link(array(
        'rel' => 'prev',
        'href' => $prev_href,
      ));
      $variables['prev_url'] = $prev_href;
      $variables['prev_title'] = check_plain($prev['title']);
    }
    if (in_array('up', $navigation_options) && $book_link['plid'] && ($parent = book_link_load($book_link['plid']))) {
      $parent_href = url($parent['href']);
      drupal_add_link(array(
        'rel' => 'up',
        'href' => $parent_href,
      ));
      $variables['parent_url'] = $parent_href;
      $variables['parent_title'] = check_plain($parent['title']);
    }
    if (in_array('next', $navigation_options) && ($next = book_next($book_link))) {
      $next_href = url($next['href']);
      drupal_add_link(array(
        'rel' => 'next',
        'href' => $next_href,
      ));
      $variables['next_url'] = $next_href;
      $variables['next_title'] = check_plain($next['title']);
    }
  }
  $variables['has_links'] = FALSE;

  // Link variables to filter for values and set state of the flag variable.
  $links = array(
    'prev_url',
    'prev_title',
    'parent_url',
    'parent_title',
    'next_url',
    'next_title',
  );
  foreach ($links as $link) {
    if (isset($variables[$link])) {

      // Flag when there is a value.
      $variables['has_links'] = TRUE;
    }
    else {

      // Set empty to prevent notices.
      $variables[$link] = '';
    }
  }
}