last option for scala scripts

optLast.scala

import annotation.tailrec

def optLast[A](opts: String*)(convert: String => Option[A])(implicit args: List[String]): Option[A] = {
  val longOpts = opts filter { _ startsWith "--" }
  val longOptsRE = longOpts.mkString("^(","|",")=(.+)").r

  @tailrec def optLastInternal(current: Option[A], args: List[String]): Option[A] = args match {
    case Nil =>
      current

    case opt :: arg :: tail if opts contains opt =>
      optLastInternal(convert(arg), tail)

    case longOptsRE(_, arg) :: tail =>
      optLastInternal(convert(arg), tail)

    case _ :: tail =>
      optLastInternal(current, tail)
  }

  optLastInternal(None, args)
}

// example

implicit val arguments = args.toList

val projectArg: Option[String] = optLast("-p", "--project") {
  arg => Some(arg)
}