Club Drupal

  public function option_definition() {

    $options = parent::option_definition();

    $options['extension_detect_tar'] = array('default' => FALSE, 'bool' => TRUE);

    return $options;

  }

  public function options_form(&$form, &$form_state) {

    parent::options_form($form, $form_state);

    $form['extension_detect_tar'] = array(

      '#type' => 'checkbox',

      '#title' => t('Detect if tar is part of the extension'),

      '#description' => t("See if the previous extension is '.tar' and if so, add that, so we see 'tar.gz' or 'tar.bz2' instead of just 'gz'."),

      '#default_value' => $this->options['extension_detect_tar'],

    );

  }

    if (!$this->options['extension_detect_tar']) {

      if (preg_match('/\.([^\.]+)$/', $value, $match)) {

        return $this->sanitize_value($match[1]);

      }

    }

    else {

      $file_parts = explode('.', basename($value));

      // If there is an extension.

      if (count($file_parts) > 1) {

        $extension = array_pop($file_parts);

        $last_part_in_name = array_pop($file_parts);

        if ($last_part_in_name === 'tar') {

          $extension = 'tar.' . $extension;

        }

        return $this->sanitize_value($extension);

      }