scala nl2br with scalatags

nl2br.scala

import scalatags.Text.all._

object nl2br {
  def apply(s: String): Modifier = {
    val lines = s.replaceAllLiterally("\r\n", "\n").replaceAllLiterally("\r", "\n").split('\n')

    lines.foldLeft(None: Option[Modifier]) { case (step, line) =>
      Some(step.fold[Modifier](line)(previous => Vector[Modifier](previous, br, line)))
    }.getOrElse("")
  }
}