(function ($) {

"use strict";

/**
 * Select the language code of an imported file based on its filename.
 *
 * This only works if the file name ends with "LANGCODE.po".
 */
Drupal.behaviors.importLanguageCodeSelector = {
  attach: function (context, settings) {
    var $form = $('#locale-translate-import-form').once('autodetect-lang');
    if ($form.length) {
      var $langcode = $form.find('.langcode-input');
      $form.find('.file-import-input')
        .on('change', function () {
          var matches = $(this).val().match(/\.([\-\w]+)\.po/);
          if (matches && $langcode.find('option[value="' + matches[1] + '"]').length) {
            $langcode.val(matches[1]);
          }
        });
    }
  }
};

})(jQuery);