findInParents.scala

@annotation.tailrec
def findFileInParents(name: String, dir: File = file(".")): Option[File] = {
  lazy val parent = Option(dir.getAbsoluteFile.getParentFile)
  val f = dir / name
  if (!f.exists) {
    println(s"no $f. checking parent")
    if (parent.isDefined) findFile(name, parent.get)
    else None
  } else Some(f)
}