Timing and Logging from REPL

REPL power mode.scala

:power
def using[A <: {def close(): Unit}, B](param: A)(f: A => B): B =
try { f(param) } finally { param.close() }
def appendToFile(fileName:String, textData:String) =
  using (new java.io.FileWriter(fileName, true)){
    fileWriter => using (new java.io.PrintWriter(fileWriter)) {
      printWriter => printWriter.println(textData)
    }
  }
def timedAndLogged[T](body: => T): T = {
       val start = System.nanoTime
       try {
          val result = body
          appendToFile("/tmp/repl.log",result.toString)
          result
          }
       finally println(" "+(System.nanoTime - start) + " nanos elapsed. ")
       }
:wrap timedAndLogged