popsu-d7/sites/all/modules/pathauto/pathauto.js

(function ($) {

Drupal.behaviors.pathFieldsetSummaries = {
  attach: function (context) {
    $('fieldset.path-form', context).drupalSetSummary(function (context) {
      var path = $('.form-item-path-alias input', context).val();
      var automatic = $('.form-item-path-pathauto input', context).attr('checked');

      if (automatic) {
        return Drupal.t('Automatic alias');
      }
      else if (path) {
        return Drupal.t('Alias: @alias', { '@alias': path });
      }
      else {
        return Drupal.t('No alias');
      }
    });
  }
};

})(jQuery);