cforge-2.0.x-dev/src/Plugin/migrate/process/MailFooter.php

<?php

/**
 * @file
 */
namespace Drupal\cforge\Plugin\migrate\process;

/**
 * convert the d7 footer tokens to d8 tokens.
 *
 * @MigrateProcessPlugin(
 *   id = "d7_cforge_mail_footer"
 * )
 * @deprecated
 */
class MailFooter extends ProcessPluginBase {

  /**
   * {@inheritdoc}
   *
   * Division settings is a string with key|value pairs on each line
   */
  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
    return str_replace('@site', '[site:name]', $value);
  }

}