<?php
/**
 * @file
 * menu_html.module
 */

/**
 * Implements hook_form_node_alter().
 */
function menu_html_form_node_form_alter(&$form, $form_state, $form_id) {
  if (!isset($form['menu']) || !user_access('administer menu')) {
    return;
  }

  $item = isset($form['menu']['link']['options']['#value']['html']) ? TRUE : FALSE;
  if ($item) {
    $form['menu']['link_title']['#maxlength'] = 255;
  }

  $form['menu']['link']['menu_html'] = array(
    '#type' => 'checkbox',
    '#title' => t('Allow html'),
    // "html" is "1" or unset.
    '#default_value' => $item ? 1 : 0,
    '#description' => t('If you want to add html tags to the title of a menu, enable this. This should only be accessible to trusted users.'),
  );
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function menu_html_form_menu_edit_item_alter(&$form, $form_state, $form_id) {
  $form['link_title']['#maxlength'] = 255;
  $form['menu_html'] = array(
    '#type' => 'checkbox',
    '#title' => t('Allow html'),
    '#default_value' => array_key_exists('html', $form['options']['#value']) ? $form['options']['#value']['html'] : 0,
    '#description' => t('If you want to add html tags to the title of a menu, enable this. This should only be accessible to trusted users.'),
  );
}

/**
 * Implements hook_menu_link_alter().
 */
function menu_html_menu_link_alter(&$item) {
  if (isset($item['menu_html']) && $item['menu_html']) {
    $item['options']['html'] = $item['menu_html'];
  }
  elseif (isset($item['menu_html']) && $item['menu_html'] == 0) {
    unset($item['options']['html']);
  }
}