test.scala

def paginate(min: Int, max: Int, selected: Int): String = {
  require(selected <= max, "selected can't be bigger than max")
  require(selected >= min, "selected can't be less than max")
  require(max >= min, "max can't be bigger than min")
  
  val winMax = Math.min(Math.max(min + 9, selected + 4), max)
  val winMin = Math.max(Math.min(max - 8, selected - 5), min)
  
  val prev = if (selected > min) "< " else ""
  val next = if (selected < max) " >" else ""
  
  val pages = (winMin to winMax).map { 
    case `selected` => "*" + selected + "*"
    case x => x.toString 
  }.mkString(" " )
  
  prev + pages + next
}