LPath

LPath.scala

case class LPath(root: Boolean, folders: Vector[String], file: Option[String]) {
  def fromRoot: LPath = LPath(true, folders, file)

  def withFile(file: String): LPath = LPath(root, folders, Some(file))

  def withFolder(f: String) = LPath(root, folders ++ Vector(f), file)

  def withFolders(fs: List[String]) = LPath(root, folders ++ fs.toVector, file)

  override def toString: String = s"${if (root) "/" else ""}${if (folders.length > 0) folders.mkString("/") + "/" else ""}${file.getOrElse("")}"

  def ++(other: LPath): LPath = join(other)

  def join(other: LPath): LPath = {
    other match {
      case LPath(false, _, _) if file.isEmpty => LPath(root, folders ++ other.folders, other.file)
      case _ =>
        if (other.root)
          throw new Exception("Cannot append with a path containing root.")
        else
          throw new Exception("Cannot append to a path with file.")
    }
  }
}

object LPath {
  def apply(): LPath = LPath(false, Vector.empty, None)
}