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<?php
/**
 * @file custom_taxonomy_menu_block
 *
 * @description
 * Add the menu items of main-menu to the taxonomy menu block called main-menu
 **/

define('TMB_MAIN_MENU_VID', 2);

/**
 * Implements hook_taxonomy_menu_block_alter().
 *
 * Alters the taxonomy menu block data.
 **/
function custom_taxonomy_menu_block_taxonomy_menu_block_alter(&$tree, $config) {
  // Alter the output of only a single specific taxonomy menu block.
  if($config['vid'] == TMB_MAIN_MENU_VID && $config['delta'] == 1) {

    // Get the build info from the main menu.
    $main_menu_build = _menu_build_tree('main-menu');

    // Check access for the current user to each item in the tree.
    menu_tree_check_access($main_menu_build['tree'], $main_menu_build['node_links']);

    // If the active page is a node, get the object for setting the active trail.
    $obj = new stdClass();
    if(arg(0) == 'node') {
      $obj = menu_get_object();
    }

    // Get the language object
    global $language;

    // Transform the menu items into tmb menu items.
    foreach ($main_menu_build['tree'] as $menu_item) {
      // For multilingual menu's, check the menu item's language
      if(isset($menu_item['link']['language'])) {
        if($menu_item['link']['language'] == $language->language) {
          custom_taxonomy_menu_block_tmb_transform_menu_item($menu_item, $tree, $main_menu_build, 0, $config['depth'], $obj);
        }
      }
      else {
        custom_taxonomy_menu_block_tmb_transform_menu_item($menu_item, $tree, $main_menu_build, 0, $config['depth'], $obj);
      }
    }
  }
}

/**
 * Transform a regular menu item to a tmb menu item.
 **/
function custom_taxonomy_menu_block_tmb_transform_menu_item($menu_item, &$tree, $main_menu_build, $depth = 0, $max_depth = 8, $obj) {
  // Set the menu item's parent
  $parents = array(0);
  if (isset($main_menu_build['node_links'][$menu_item['link']['plid']])) {
    $parents[0] = $main_menu_build['node_links'][$menu_item['link']['plid']];
  }

  // Set the active trail
  $active_trail = 0;
  // If the active item is a node, check if this menu item matches it.
  if (isset($obj->nid)) {
    if ($menu_item['link']['link_path'] == 'node/' . $obj->nid) {
      // Setting the active trail to 2 gives the list item the class active.
      $active_trail = 2;

      // If the item has a parent, add the active-trail class
      if($parents[0] <> 0) {
        custom_taxonomy_menu_block_tbm_active_trail($main_menu_build['node_links'][$menu_item['link']['plid']], $tree);
      }
    }
  }

  // Create the new tmb menu item
  $tree['main_menu_mlid_'.$menu_item['link']['mlid']] = array(
    'name' => $menu_item['link']['link_title'],
    'path' => drupal_get_path_alias($menu_item['link']['link_path']),
    'depth' => $depth++,
    'parents' => $parents,
    'active_trail' => $active_trail,
  );

  // Create the deeper levels if the maximum depth is not reached.
  if(!empty($menu_item['below']) && $depth < $max_depth) {
    foreach ($menu_item['below'] as $child_menu_item) {
      custom_taxonomy_menu_block_tmb_transform_menu_item($child_menu_item, $tree, $main_menu_build, $depth, $max_depth, $obj);
    }
  }
}

/**
 * Set the parents active trail.
 **/
function custom_taxonomy_menu_block_tbm_active_trail($parent, &$tree) {
  // Setting active trail to 1 gives the list class the class active-trail.
  $tree[$parent]['active_trail'] = 1;

  // Prevent the top level from going deeper
  if($tree[$parent]['parents'][0] <> 0) {
    custom_taxonomy_menu_block_tbm_active_trail($tree[$parent]['parents'][0], $tree);
  }
}

name = Custom taxonomy menu block
description = Alter taxonomy menu blocks
core = 7.x

package = the AIM

version = 7.x-1.0