taking advantage of lazy evaluation and functional methodology to handle user interaction.

gistfile1.scala

import scala.io.Source

def getUserInputWhere(inputHint: ()=>Unit, cond: String=>Boolean) = {
	Stream.continually[String]( {
		inputHint()
		readLine()
	}).find( l => l == null || cond(l)).get
}

getUserInputWhere(
	() => println( "Please input something more than 5 characters"),
	l => l.length > 5) 
	match {
		case null => println("User cancelled input")
		case s:String => println("User enterred: " + s)
	}