split1.scala

   val Gap1 = '-'
    def splitSimplePass1(seq: List[Char], gap: Char): List[List[Char]] = {
      def isMatch(inGapped: Boolean, c: Char)  = {
        if (inGapped) 
          c == gap
        else
          c != gap
      }
      val isGap = (seq(0) == gap)
      val s = seq.takeWhile{ isMatch(isGap,_) }
      val tail = seq.takeRight(seq.length - s.length)
      tail match {
        case Nil => s :: Nil
        case _   => s :: splitSimplePass1(tail, gap)
      }
    }