path: root/modules/menu/menu.module

<?php
// $Id$

/**
 * @file
 * Allows administrators to customize the site navigation menu.
 */

/**
 * Implementation of hook_help().
 */
function menu_help($section) {
  switch ($section) {
    case 'admin/help#menu':
      $output = t('<p>Menus are a collection of links (menu items) used to navigate a website. The menu module provides an interface to control and customize the powerful menu system that comes with Drupal. Menus are primarily displayed as a hierarchical list of links using Drupal\'s highly flexible <a href="@admin-block">blocks</a> feature. Each menu automatically creates a block of the same name. By default, new menu items are placed inside a built-in menu labelled %navigation, but administrators can also create custom menus.</p>
<p>Drupal themes generally provide out-of-the-box support for two menus commonly labelled %primary-links and %secondary-links. These are sets of links which are usually displayed in the header or footer of each page (depending on the currently active theme). Any menu can be designated as the primary or secondary links menu via the <a href="@menu-settings">menu settings page</a>.</p>
Menu administration tabs:
<ul>
  <li>On the administer menu page, administrators can "edit" to change the title, description, parent or weight of a menu item. Under the "operations" column, click on "enable/disable" to toggle a menu item on or off. Only menu items which are enabled are displayed in the corresponding menu block. Note that the default menu items generated by the menu module cannot be deleted, only disabled.</li>
  <li>Use the "add menu" tab to submit a title for a new custom menu. Once submitted, the menu will appear in a list toward the bottom of the administer menu page underneath the main navigation menu. Under the menu name there will be links to edit or delete the menu, and a link to add new items to the menu.</li>
  <li>Use the "add menu item" tab to create new links in either the navigation or a custom menu (such as a primary/secondary links menu). Select the parent item to place the new link within an existing menu structure. For top level menu items, choose the name of the menu in which the link is to be added.</li>
</ul>', array('%navigation' => 'Navigation', '%primary-links' => 'primary links', '%secondary-links' => 'secondary links', '@admin-block' => url('admin/build/block'), '@menu-settings' => url('admin/build/menu/settings')));
      $output .= '<p>'. t('For more information please read the configuration and customization handbook <a href="@menu">Menu page</a>.', array('@menu' => 'http://drupal.org/handbook/modules/menu/')) .'</p>';
      return $output;
    case 'admin/build/menu':
      return '<p>'. t('Menus are a collection of links (menu items) used to navigate a website. The list(s) below display the currently available menus along with their menu items. Select an operation from the list to manage each menu or menu item.', array('@admin-settings-menus' => url('admin/build/menu/settings'), '@admin-block' => url('admin/build/block'))) .'</p>';
    case 'admin/build/menu/menu/add':
      return '<p>'. t('Enter the name for your new menu. Remember to enable the newly created block in the <a href="@blocks">blocks administration page</a>.', array('@blocks' => url('admin/build/block'))) .'</p>';
    case 'admin/build/menu/item/add':
      return '<p>'. t('Enter the title, path, position and the weight for your new menu item.') .'</p>';
  }
}

/**
 * Implementation of hook_perm().
 */
function menu_perm() {
  return array('administer menu');
}

/**
 * Implementation of hook_menu().
 */
function menu_menu() {
  $items['admin/build/menu'] = array(
    'title' => t('Menus'),
    'description' => t("Control your site's navigation menu, primary links and secondary links. as well as rename and reorganize menu items."),
    'page callback' => 'menu_overview',
    'access callback' => 'user_access',
    'access arguments' => array('administer menu'),
  );
  $items['admin/build/menu/list'] = array(
    'title' => t('List'),
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
  );
  $items['admin/build/menu/item/disable'] = array(
    'title' => t('Disable menu item'),
    'page callback' => 'menu_flip_item',
    'page arguments' => array('0'),
    'type' => MENU_CALLBACK,
  );
  $items['admin/build/menu/item/enable'] = array(
    'title' => t('Enable menu item'),
    'page callback' => 'menu_flip_item',
    'page arguments' => array('1'),
    'type' => MENU_CALLBACK,
  );
  $items['admin/build/menu/item/add'] = array(
    'title' => t('Add menu item'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('menu_edit_item_form', 'add'),
    'parent' => 'admin/build/menu',
    'type' => MENU_LOCAL_TASK);
  $items['admin/build/menu/item/edit'] = array(
    'title' => t('Edit menu item'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('menu_edit_item_form', 'edit'),
    'type' => MENU_CALLBACK);
  $items['admin/build/menu/item/reset'] = array(
    'title' => t('Reset menu item'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('menu_reset_item'),
    'type' => MENU_CALLBACK);
  $items['admin/build/menu/item/delete'] = array(
    'title' => t('Delete menu item'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('menu_item_delete_form'),
    'type' => MENU_CALLBACK);
  $result = db_query('SELECT * FROM {menu_custom} WHERE admin = 1');
  while ($item = db_fetch_array($result)) {
    $item['_custom_item'] = TRUE;
    $item['_external'] = menu_path_is_external($item['path']);
    $items[$item['path']] = $item;
  }

  return $items;
/*
    $items[] = array('path' => 'admin/build/menu/menu/add',
      'title' => t('Add menu'),
      'callback' => 'drupal_get_form',
      'callback arguments' => array('menu_edit_menu_form', 'add'),
      'access' => user_access('administer menu'),
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/build/menu/menu/edit',
      'title' => t('Edit menu'),
      'callback' => 'drupal_get_form',
      'callback arguments' => array('menu_edit_menu_form', 'edit'),
      'access' => user_access('administer menu'),
      'type' => MENU_CALLBACK);
    $items[] = array('path' => 'admin/build/menu/menu/delete',
      'title' => t('Delete menu'),
      'callback' => 'drupal_get_form',
      'callback arguments' => array('menu_item_delete_form'),
      'access' => user_access('administer menu'),
      'type' => MENU_CALLBACK);

    $items[] = array('path' => 'admin/build/menu/settings',
      'title' => t('Settings'),
      'callback' => 'drupal_get_form',
      'callback arguments' => array('menu_configure'),
      'type' => MENU_LOCAL_TASK,
      'weight' => 5,
    );
*/
}

/**
 * Implementation of hook_menu_alter.
 */
function menu_menu_alter(&$menu, $phase) {
  switch ($phase) {
    case MENU_ALTER_MODULE_DEFINED:
      foreach ($menu as $path => $item) {
        if (isset($item['_custom_item']) && $item['_custom_item'] && !$item['_external']) {
          list($ancestors, $placeholders) = menu_get_ancestors(explode('/', $path, 6));
          // Remove the item itself, custom items need to inherit from an existing item.
          array_shift($ancestors);
          array_shift($placeholders);
          $inherit_item = db_fetch_object(db_query_range('SELECT * FROM {menu} WHERE path IN ('. implode (',', $placeholders) .') ORDER BY fit DESC', $ancestors, 0, 1));
          drupal_set_message(var_export($inherit_item, TRUE));
          $menu[$path]['access callback'] = $inherit_item->access_callback;
          $menu[$path]['access arguments'] = unserialize($inherit_item->access_arguments);
          $menu[$path]['page callback'] = $inherit_item->page_callback;
          $menu[$path]['page arguments'] = unserialize($inherit_item->page_arguments);
        }
      }
      break;
    case MENU_ALTER_PREPROCESSED:
      $result = db_query('SELECT * FROM {menu_custom} me WHERE admin = 0');
      while ($item = db_fetch_array($result)) {
        $menu[$item['path']] = $item + $menu[$item['path']];
      }
      break;
  }
}

/**
 * Menu callback which displays every menu element accessible to the current
 * user and the relevant operations.
 */
function menu_overview() {
  $header = array(t('Menu item'), t('Expanded'), array('data' => t('Operations'), 'colspan' => '3'));
  $result = db_query('SELECT m.*, me.disabled FROM {menu} m LEFT JOIN {menu_custom} me ON m.path = me.path WHERE visible = 1 OR (disabled = 1 AND admin = 0) ORDER BY mleft');
  $map = arg();
  $rows = array();
  while ($item = db_fetch_object($result)) {
    _menu_translate($item, $map, MENU_RENDER_LINK);
    if (!$item->access) {
      continue;
    }
    $title = str_repeat('&nbsp;&nbsp;', $item->depth - 1) . ($item->depth > 1 ? '-&nbsp;' : '');
    $title .= l($item->title, $item->path, (array)$item);
    // Populate the operations field.
    $operations = array();
    // Set the edit column.
    $operations[] = array('data' => l(t('edit'), 'admin/build/menu/item/edit/'. $item->mid));
    if ($item->disabled) {
      $title .= ' ('. t('disabled') .')';
      $class = 'menu-disabled';
      $operations[] = array('data' => l(t('enable'), 'admin/build/menu/item/enable/'. $item->mid));
    }
    else {
      $class = 'menu-enabled';
      $operations[] = array('data' => l(t('disable'), 'admin/build/menu/item/disable/'. $item->mid));
    }
    // Set the reset column.
    if ($item->type & MENU_CREATED_BY_ADMIN) {
      $operations[] = array('data' => l(t('delete'), 'admin/build/menu/item/delete/'. $item->mid));
    }
    else if ($item->type & MENU_MODIFIED_BY_ADMIN) {
      $operations[] = array('data' => l(t('reset'), 'admin/build/menu/item/reset/'. $item->mid));
    }
    else {
      $operations[] = array('data' => '');
    }
    $row = array(
      array('data' => $title, 'class' => $class),
      array('data' => ($item->has_children ? (($item->type & MENU_EXPANDED) ? t('Yes') : t('No')) : ''), 'class' => $class),
    );
    foreach ($operations as $operation) {
      $operation['class'] = $class;
      $row[] = $operation;
    }
    $rows[] = $row;
  }
  return theme('table', $header, $rows);
}

/**
 * Menu callback; enable/disable a menu item.
 *
 * @param $visible
 *   0 to remove from the menu tree. 1 to make the item and its children
 *   reappear in menu tree.
 * @param $mid
 *    mid of the menu item.
 * @param $path
 *    Optional. Path of the menu item. Only considered if mid is NULL.
 */
function menu_flip_item($visible, $mid, $path = NULL) {
  if (isset($mid)) {
    $item = menu_get_item_by_mid($mid);
  }
  elseif (isset($path)) {
    $item = menu_get_item($path);
  }
  if (isset($item) && $item->access) {
    $result = db_query('SELECT child.*, parent.path AS parent_path FROM {menu} child INNER JOIN {menu} parent ON child.pid = parent.mid WHERE %d <= child.mleft AND child.mright <= %d', $item->mleft, $item->mright);
    while ($item = db_fetch_object($result)) {
      $update_result = db_query("UPDATE {menu_custom} SET disabled = %d WHERE path = '%s'", !$visible, $item->path);
      if (!db_affected_rows($update_result)) {
        db_query("INSERT INTO {menu_custom} (parent, path, title, description, weight, type, admin, disabled) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d, %d)", $item->parent_path, $item->path, $item->title, $item->description, 0, $item->type, 0, !$visible);
      }
    }
    menu_rebuild();
    if (isset($mid)) {
      drupal_set_message($visible ? t('The menu item has been enabled.') : t('The menu item has been disabled.'));
      drupal_goto('admin/build/menu');
    }
  }
}

/**
 * Present the menu item editing form.
 */
function menu_edit_item_form($type, $mid = 0) {
  if ($type == 'edit') {
    if (!($item = menu_get_item_by_mid($mid))) {
      drupal_not_found();
      return;
    }
  }
  else {
    // This is an add form.
    // The mid argument (if set) will be the default pid to use.
    $item = (object)array('mid' => 0, 'pid' => $mid ? $mid : 0, 'weight' => 0, 'type' => MENU_CUSTOM_ITEM, 'title' => '', 'description' => '', 'path' => '');
  }

  $form['title'] = array('#type' => 'textfield',
    '#title' => t('Title'),
    '#default_value' => $item->title,
    '#description' => t('The name of the menu item.'),
    '#required' => TRUE,
  );
  $form['description'] = array(
    '#type' => 'textfield',
    '#title' => t('Description'),
    '#default_value' => $item->description,
    '#description' => t('The description displayed when hovering over a menu item.'),
  );

  if ($item->type & MENU_CREATED_BY_ADMIN) {
    $form['path'] = array(
      '#type' => 'textfield',
      '#title' => t('Path'),
      '#default_value' => $item->path,
      '#description' => t('The path this menu item links to. This can be an internal Drupal path such as %add-node or an external URL such as %drupal. Enter %front to link to the front page.', array('%front' => '<front>', '%add-node' => 'node/add', '%drupal' => 'http://drupal.org')),
      '#required' => TRUE,
    );
  }
  else {
    $form['_path'] = array(
      '#type' => 'item',
      '#title' => t('Path'),
      '#description' => l($item->path, $item->link_path, (array)$item),
    );
  }
  $form['original_path'] = array('#type' => 'value', '#value' => $item->path);

  $form['expanded'] = array(
    '#type' => 'checkbox',
    '#title' => t('Expanded'),
    '#default_value' => $item->type & MENU_EXPANDED ? 1 : 0,
    '#description' => t('If selected and this menu item has children, the menu will always appear expanded.'),
  );

  // Generate a list of possible parents (not including this item or descendants).
  $options = menu_parent_options($item->mid);
  $form['pid'] = array(
    '#type' => 'select',
    '#title' => t('Parent item'),
    '#default_value' => $item->pid,
    '#options' => $options,
  );
  $form['weight'] = array(
    '#type' => 'weight',
    '#title' => t('Weight'),
    '#default_value' => isset($item->weight) ? $item->weight : 0,
    '#description' => t('Optional. In the menu, the heavier items will sink and the lighter items will be positioned nearer the top.'),
  );

  // Always enable menu items (but not menus) when editing them.
  if (!($item->type & MENU_IS_ROOT)) {
    $item->type |= MENU_VISIBLE_IN_TREE | MENU_VISIBLE_IN_BREADCRUMB;
  }

  $form['type'] = array('#type' => 'value', '#value' => $item->type);
  $form['submit'] = array('#type' => 'submit', '#value' => t('Submit'));

  return $form;
}

function menu_edit_item_form_validate($form_id, $form_values) {
  if (isset($form_values['path'])) {
    $path = $form_values['path'];
    // Skip external links.
    $colonpos = strpos($path, ':');
    if ($colonpos !== FALSE && !preg_match('![/?#]!', substr($path, 0, $colonpos))) {
      return;
    }
    $item = menu_get_item($path);
    if (!$item || !$item->access) {
      form_set_error('path', t('This path is either invalid or you do not have access to it'));
    }
    elseif ($path != $form_values['original_path'] && $item->path == $path) {
      form_set_error('path', t('There is already a menu item pointing to this path.'));
    }
  }
}
/**
 * Process menu and menu item add/edit form submissions.
 */
function menu_edit_item_form_submit($form_id, $form_values) {
  menu_edit_item_save($form_values);
  return 'admin/build/menu';
}

/**
 * Return a list of menu items that are valid possible parents for the
 * given menu item. The list excludes the given item and its children.
 *
 * @param $mid
 *   The menu item id for which to generate a list of parents.
 *   If $mid == 0 then the complete tree is returned.
 * @param $pid
 *   The menu item id of the menu item at which to start the tree.
 *   If $pid > 0 then this item will be included in the tree.
 * @param $depth
 *   The current depth in the tree - used when recursing to indent the tree.
 * @return
 *   An array of menu titles keyed on the mid.
 */
function menu_parent_options($mid, $pid = 0, $depth = 0) {
  $options = array(0 => t('Root'));
  // Exclude $mid and its children from the list unless $mid is 0.
  if ($mid && $mid == $pid) {
    return $options;
  }
  $sql = 'SELECT m.*, me.disabled FROM {menu} m LEFT JOIN {menu_custom} me ON m.path = me.path WHERE (m.visible = 1 OR (me.disabled = 1 AND me.admin = 0))';
  if (!$mid) {
    $params = array();
  }
  elseif ($item = menu_get_item_by_mid($mid)) {
    $sql .=' AND (mleft < %d OR %d < mright)';
    $params = array($item->mleft, $item->mright);
  }
  else {
    return $options;
  }
  if ($parent_item = menu_get_item_by_mid($pid)) {
    $sql .= ' AND %d <= mleft AND %d <= mright';
    $params[] = $parent_item->mleft;
    $params[] = $parent_item->mright;
  }
  $sql .= ' ORDER BY mleft';
  $result = db_query($sql, $params);
  $map = arg();

  while ($item = db_fetch_object($result)) {
    _menu_translate($item, $map, MENU_RENDER_LINK);
    $title = str_repeat('--', $item->depth) .' '. $item->title;
    if ($item->disabled) {
      $title .= ' ('. t('disabled') .')';
    }
    $options[$item->mid] = $title;
  }
  return $options;
}

/**
 * Save changes to a menu item into the database.
 *
 * @return mid
 */
function menu_edit_item_save($edit) {
  if (isset($edit['expanded'])) {
    if ($edit['expanded']) {
      $edit['type'] |= MENU_EXPANDED;
    }
    else {
      $edit['type'] &= ~MENU_EXPANDED;
    }
  }

  $edit['type'] = $edit['type'] | MENU_MODIFIED_BY_ADMIN;

  $parent = $edit['pid'] ? db_result(db_query('SELECT path FROM {menu} WHERE mid = %d', $edit['pid'])) : '';
  $t_args = array('%title' => $edit['title']);
  if (!empty($edit['original_path']) && db_num_rows(db_query("SELECT * FROM {menu_custom} WHERE path='%s'", $edit['original_path']))) {
    db_query("UPDATE {menu_custom} SET parent = '%s', title = '%s', description = '%s', weight = %d, type = %d, path = '%s' WHERE path = '%s'", $parent, $edit['title'], $edit['description'], $edit['weight'], $edit['type'], isset($edit['path']) ? $edit['path'] : $edit['original_path'], $edit['original_path']);
  }
  else {
    db_query("INSERT INTO {menu_custom} (parent, path, title, description, weight, type, admin) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d)", $parent, isset($edit['path']) ? $edit['path'] : $edit['original_path'], $edit['title'], $edit['description'], $edit['weight'], $edit['type'], isset($edit['path']));
  }
  watchdog('menu', t('Saved menu item %title.', $t_args), WATCHDOG_NOTICE, l(t('view'), 'admin/build/menu'));
  drupal_set_message(t('The menu item %title has been saved.', $t_args));
  menu_rebuild();
}

/**
 * Remove the menu item.
 */
function menu_node_form_delete($node) {
  menu_delete_item(array('path' => 'node/'. $node->nid));
}

/**
 * Menu callback; handle the adding/editing of a new menu.
 */
function menu_edit_menu_form($type, $mid = 0) {
  if ($type == 'edit') {
    if (!$item = menu_get_item_by_mid($mid)) {
      drupal_not_found();
      return;
    }
  }
  else {
    $item = array('mid' => 0, 'pid' => 0, 'path' => '', 'weight' => 0, 'type' => MENU_CUSTOM_MENU);
  }
  $form['title'] = array('#type' => 'textfield',
    '#title' => t('Title'),
    '#default_value' => $item['title'],
    '#description' => t('The name of the menu.'),
    '#required' => TRUE,
  );
  $form['mid'] = array('#type' => 'value', '#value' => $item['mid']);
  $form['pid'] = array('#type' => 'value', '#value' => $item['pid']);
  $form['path'] = array('#type' => 'value', '#value' => $item['path']);
  $form['weight'] = array('#type' => 'value', '#value' => $item['weight']);
  $form['type'] = array('#type' => 'value', '#value' => $item['type']);
  $form['submit'] = array('#type' => 'submit', '#value' => t('Submit'));
  // Reuse the submit function of menu_edit_item_form.
  $form['#submit']['menu_edit_item_form_submit'] = array();
  $form['#validate']['menu_edit_item_form_validate'] = array();
  $form['#theme'] = 'menu_edit_item_form';

  return $form;
}

/**
 * Menu callback; delete a single custom item.
 */
function menu_item_delete_form($mid) {
  if (!($menu = db_fetch_object(db_query('SELECT type, path, title FROM {menu} WHERE mid = %d', $mid)))) {
    drupal_not_found();
    return;
  }

  $form['path'] = array('#type' => 'value', '#value' => $menu->path);
  $form['type'] = array('#type' => 'value', '#value' => $menu->type);
  $form['title'] = array('#type' => 'value', '#value' => $menu->title);

  if ($menu->type & MENU_IS_ROOT) {
    $message = t('Are you sure you want to delete the menu %item?', array('%item' => $menu->title));
  }
  else {
    $message = t('Are you sure you want to delete the custom menu item %item?', array('%item' => $menu->title));
  }

  return confirm_form($form, $message, 'admin/build/menu', t('This action cannot be undone.'), t('Delete'));
}

/**
 * Process menu delete form submissions.
 */
function menu_item_delete_form_submit($form_id, $form_values) {
  menu_delete_item($form_values['path']);

  $t_args = array('%title' => $form_values['title']);
  if ($form_values['type'] & MENU_IS_ROOT) {
    drupal_set_message(t('The menu %title has been deleted.', $t_args));
    watchdog('menu', t('Deleted menu %title.', $t_args), WATCHDOG_NOTICE);
  }
  else {
    drupal_set_message(t('The menu item %title has been deleted.', $t_args));
    watchdog('menu', t('Deleted menu item %title.', $t_args), WATCHDOG_NOTICE);
  }

  return 'admin/build/menu';
}

/**
 * Menu callback; reset a single modified item.
 */
function menu_reset_item($mid) {
  if (isset($mid) && $item = db_fetch_object(db_query('SELECT path, title FROM {menu} WHERE mid = %d', $mid))) {
    $form['mid'] = array('#type' => 'value', '#value' => $item->path);
    return confirm_form($form, t('Are you sure you want to reset the item %item to its default values?', array('%item' => $item->title)), 'admin/build/menu', t('Any customizations will be lost. This action cannot be undone.'), t('Reset'));
  }
  else {
    drupal_not_found();
  }
}

/**
 * Process menu reset item form submissions.
 */
function menu_reset_item_submit($form_id, $form_values) {
  menu_delete_item($form_values['mid']);
  drupal_set_message(t('The menu item was reset to its default settings.'));

  return 'admin/build/menu';
}

/**
 * Delete a menu item from the database. If $item['mid'] is specified, then
 * this is used to find the existing item; otherwise, $item['path'] is used.
 *
 * @param $item
 *   The path to the menu item to be deleted.
 */
function menu_delete_item($path) {
  db_query("DELETE FROM {menu_custom} WHERE path = '%s'", $path);
  menu_rebuild();
}

// Conversion ends here.

/**
 * Implementation of hook_block().
 */
function _menu_block($op = 'list', $delta = 0) {
  if ($op == 'list') {
    $blocks = array();
    $root_menus = menu_get_root_menus();
    foreach ($root_menus as $mid => $title) {
      // Default "Navigation" block is handled by user.module.
      if ($mid != 1) {
        $blocks[$mid]['info'] = $title;
      }
    }
    return $blocks;
  }
  else if ($op == 'view') {
    $item = menu_get_item($delta);
    $data['subject'] = check_plain($item['title']);
    $data['content'] = theme('menu_tree', $delta);
    return $data;
  }
}

/**
 * Implementation of hook_nodeapi().
 */
function _menu_nodeapi(&$node, $op) {

  if (user_access('administer menu')) {
    switch ($op) {
      case 'insert':
      case 'update':
        if ($node->menu['delete']) {
          menu_node_form_delete($node);
          menu_rebuild();
        }
        elseif ($node->menu['title']) {
          $node->menu['path'] = ($node->menu['path']) ? $node->menu['path'] : "node/$node->nid";
          menu_edit_item_save($node->menu);
          menu_rebuild();
        }
        break;

      case 'delete':
        menu_node_form_delete($node);
        menu_rebuild();
        break;
    }
  }
}

/**
 * Implementation of hook_form_alter().
 * Add menu item fields to the node form.
 */
function _menu_form_alter(&$form, $form_id) {
  if (isset($form['type']) && $form['type']['#value'] .'_node_form' == $form_id) {
    $item = array();
    if ($form['nid']['#value'] > 0) {
      $item = db_fetch_array(db_query("SELECT * FROM {menu} WHERE path = 'node/%d'", $form['nid']['#value']));
      if (isset($form['#post']['menu']) && is_array($form['#post']['menu'])) {
        $item = !is_array($item) ? $form['#post']['menu'] : (($form['#post']['op'] == t('Preview')) ? array_merge($item, $form['#post']['menu']) : array_merge($form['#post']['menu'], $item));
      }
    }

    $form['menu'] = array('#type' => 'fieldset',
      '#title' => t('Menu settings'),
      '#access' => user_access('administer menu'),
      '#collapsible' => TRUE,
      '#collapsed' => empty($item['title']),
      '#tree' => TRUE,
      '#weight' => 30,
    );

    $form['menu']['title'] = array('#type' => 'textfield',
      '#title' => t('Title'),
      '#default_value' => $item['title'],
      '#description' => t('The name to display for this menu link.'),
    );

    $form['menu']['description'] = array('#type' => 'textfield',
      '#title' => t('Description'),
      '#default_value' => $item['description'],
      '#description' => t('The description displayed when hovering over a menu item.'),
    );

    // Generate a list of possible parents.
    $options = menu_parent_options($item['mid'], variable_get('menu_parent_items', 0));

    $form['menu']['pid'] = array('#type' => 'select',
      '#title' => t('Parent item'),
      '#default_value' => $item['pid'],
      '#options' => $options,
    );

    $form['menu']['path'] = array('#type' => 'hidden',
      '#value' => $item['path'],
    );

    $form['menu']['weight'] = array('#type' => 'weight',
      '#title' => t('Weight'),
      '#default_value' => $item['weight'],
      '#delta' => 10,
      '#description' => t('Optional. In the menu, the heavier items will sink and the lighter items will be positioned nearer the top.'),
    );

    $form['menu']['mid'] = array('#type' => 'hidden',
      '#value' => $item['mid'] ? $item['mid'] : 0,
    );

    $form['menu']['type'] = array('#type' => 'hidden',
      '#value' => $item['type'] ? $item['type'] : MENU_CUSTOM_ITEM,
    );

    if ($item['mid'] > 0) {
      $form['menu']['delete'] = array('#type' => 'checkbox',
        '#title' => t('Check to delete this menu item.'),
        '#default_value' => $item['delete'],
      );

      $form['menu']['advanced'] = array('#type' => 'item',
        '#value' => t('You may also <a href="@edit">edit the advanced settings</a> for this menu item.', array('@edit' => url("admin/build/menu/item/edit/{$item['mid']}"))),
      );
    }
  }
}

/**
 * Menu callback; presents menu configuration options.
 */
function menu_configure() {
  $root_menus = menu_get_root_menus();

  $primary_options = $root_menus;
  $primary_options[0] = t('No primary links');

  $form['settings_links'] = array('#type' => 'fieldset',
    '#title' => t('Primary and secondary links settings'),
  );

  $form['settings_links']['intro'] = array('#type' => 'item',
    '#value' => t('Primary and secondary links provide a navigational menu system which usually (depending on your theme) appears at the top-right of the browser window. The links displayed can be generated either from a custom list created via the <a href="@menu">menu administration</a> page or from a built-in list of menu items such as the navigation menu links.', array('@menu' => url('admin/build/menu'))),
  );

  $form['settings_links']['menu_primary_menu'] = array('#type' => 'select',
    '#title' => t('Menu containing primary links'),
    '#default_value' => variable_get('menu_primary_menu', 0),
    '#options' => $primary_options,
  );

  $secondary_options = $root_menus;
  $secondary_options[0] = t('No secondary links');

  $form['settings_links']['menu_secondary_menu'] = array('#type' => 'select',
    '#title' => t('Menu containing secondary links'),
    '#default_value' => variable_get('menu_secondary_menu', 0),
    '#options' => $secondary_options,
    '#description' => t('If you select the same menu as primary links then secondary links will display the appropriate second level of your navigation hierarchy.'),
  );

  $form['settings_authoring'] = array('#type' => 'fieldset',
    '#title' => t('Content authoring form settings'),
  );

  $form['settings_authoring']['intro'] = array('#type' => 'item',
    '#value' => t('The menu module allows on-the-fly creation of menu links in the content authoring forms. The following option limits the menus in which a new link may be added. E.g., this can be used to force new menu items to be created in the primary links menu or to hide admin menu items.'),
  );

  $authoring_options = $root_menus;
  $authoring_options[0] = t('Show all menus');

  $form['settings_authoring']['menu_parent_items'] = array('#type' => 'select',
    '#title' => t('Restrict parent items to'),
    '#default_value' => variable_get('menu_parent_items', 0),
    '#options' => $authoring_options,
    '#description' => t('Choose the menu to be made available in the content authoring form. Only this menu item and its children will be shown.'),
   );

  return system_settings_form($form);
}

/**
 * Present the menu tree, rendered along with links to edit menu items.
 */
function _menu_overview_tree() {
  $menu = menu_get_menu();
  $root_menus = menu_get_root_menus();
  $header = array(t('Menu item'), t('Expanded'), array('data' => t('Operations'), 'colspan' => '3'));
  $output = '';

  // We reverse the root menu to show user created menus first.
  foreach (array_reverse($root_menus, true) as $mid => $title) {
    $operations = array();
    if ($menu['items'][$mid]['type'] & MENU_MODIFIABLE_BY_ADMIN) {
      $operations[] = l(t('Edit'), 'admin/build/menu/menu/edit/'. $mid);
    }
    if ($menu['items'][$mid]['type'] & MENU_CREATED_BY_ADMIN) {
      $operations[] = l(t('Delete'), 'admin/build/menu/menu/delete/'. $mid);
    }
    $operations[] = l(t('Add item'), 'admin/build/menu/item/add/'. $mid);
    $table = theme('item_list', $operations);

    $rows = menu_overview_tree_rows($mid);
    $table .= theme('table', $header, $rows ? $rows : array(array(array('data' => t('No menu items defined.'), 'colspan' => 5))));

    $output .= theme('box', check_plain($title), $table);
  }
  return $output;
}