repl.scala

import java.io.{File, FileWriter}

/*
usage:
=====

:power           // switch power mode on
:load repl.scala // load this file
ReplHistory.save // save history
*/

object ReplHistory {

  def historyToString = repl.history.grep("").init.filter(!_.startsWith(":")).mkString("\n")

  def save(file: String) {
    val f = 
      if (file != null) new File(file)
      else Stream.iterate(0)(_ + 1).map(i => new File("repl-"+i+".scala")).filter(!_.exists).head
    val fw = new FileWriter(f)
    fw.write(historyToString)
    fw.close
    println("repl history saved to file "+f)
  }

  def save: Unit = save(null)
  def print = println(historyToString)

}