gistfile1.txt

trait Prepare {
  val id: PrepareId
}
case class Preparing(id: PrepareId) extends Prepare
case class Prepared(id: PrepareId, paths: Seq[Path]) extends Prepare

object Prepare {
  def pathStrings(prepare: Prepare): Seq[String] = prepare match {
    case Preparing(_) => Seq.empty[String]
    case Prepared(_, paths) => paths.map(_.toAbsolutePath.toString)
  }

  implicit class PrepareOps(val prepare: Prepare) {
    def pathStrings: Seq[String] = Prepare.pathStrings(prepare)
  }
}

repositoryService.prepared(id).pathString