insult2.scala

#!/usr/bin/env scala

import scala.collection.immutable.IndexedSeq
import scala.io.StdIn

val version = "Scala Insult Generator v0.1"

val cmdArg = if(args.length > 0) Some(args(0).toUpperCase) else None

val result = cmdArg match {
  case Some("-H") => "Usage: ./insult.scala [INSULT WORD]"
  case Some("-V") => version
  case Some(insult) => getInsult(insult)
  case None => getInsult(askUserForInsult)
}

println(result)

def askUserForInsult =
  StdIn.readLine("Please enter your insult word: ")

def spaced(str: IndexedSeq[Char]) = str.mkString(" ")

def getInsult(insult: IndexedSeq[Char]) = {
  val alphabets = 'A' to 'Z'
  val heading = alphabets filterNot (insult contains(_))

  s"""
    | ${spaced(heading)}
    |
    | "You must be wondering what happened to the rest of the letters"
    |
    |
    |
    | "They are written below"
    |
    |
    |
    |
    |
    |
    |
    | .
    | .
    | .
    |
    |
    | ${spaced(insult)}
    |
    | [$version]
  """.stripMargin
}