gistfile1.php

/**
 * A generic autocomplete page callback for any plugin system tied to a plugin
 * ui plugin.
 */
function system_plugin_autocomplete($plugin_id, $string = '') {
  $matches = array();
  $ui = system_plugin_manager('plugin_ui')->getDefinition($plugin_id);
  $manager = new $ui['manager']();
  if ($string) {
    $plugins = $manager->getDefinitions();
    $titles = array();
    foreach($plugins as $plugin_id => $plugin) {
      $titles[$plugin_id] = $plugin[$ui['title_attribute']];
    }
    $matches = preg_grep("/\b". $string . "/i", $titles);
  }

  return new JsonResponse($matches);
}