file walk

gistfile1.scala

  def list(path: String): Future[Seq[File]] = {
    val files = new java.io.File(path).listFiles.filter(a => !a.isHidden())
    Future.value(files.toSeq)

  }

  def walk(path: String): Future[Seq[File]] = {
    list(path) flatMap { entries =>
      val children: Seq[Future[Seq[File]]] = entries map { entry => {
          if (entry.isDirectory)
	    walk(entry.getPath())          
          else 
	    Future.value(Seq(entry))          
        }
      }
      
      // Future.collect(children) flatMap (_.flatten) //compile error!

      val a : Future[Seq[Seq[File]]] = Future.collect(children)
      
      val b = a.map(_.flatten)
      
      b

    }
  }