Scala Drop to REPL (like debug break..)

drop-to-repl-2.9.RC1.scala

/**
 * Originally authored by Jason. Updated by me (Andy) to work in Scala 2.9 RC1
 *
 * @author Jason Zaugg (aka retronym), Andy Scott
 */
object InterpreterUtil {
  import scala.tools.nsc.interpreter._
  import scala.tools.nsc.interpreter.Results._
  import scala.tools.nsc.Settings

  def createREPL(args: NamedParam*): ILoop = {
    val intLoop = new ILoop
    intLoop.settings = {
      val s = new Settings(println)
      s.embeddedDefaults(getClass.getClassLoader)
      s.classpath.value = System.getProperty("java.class.path")
      s
    }

    intLoop.createInterpreter
    intLoop.in = InteractiveReader()
    intLoop.intp.initialize

    // rebind exit so people don't accidentally call System.exit by way of predef
    intLoop.intp.beQuietDuring {
      intLoop.intp.interpret("""def exit = println("Type :quit to resume program execution.")""")
      for (p <- args) {
        intLoop.intp.bind(p) match {
          case Results.Error =>
          case _ => println(p.toString)
        }
      }
    }

    intLoop
  }
}