Data structure independent plotting

PlotInput.scala

import scalaz.effect.IO

trait Source[F[_], A] {
  def iterator(s: F[A]): Iterator[A]
}

object Source {
  implicit def listSource[A]: Source[List, A] = (s: List[A]) => s.toIterator
  implicit def streamSource[A]: Source[Stream, A] = (s: Stream[A]) => s.toIterator
}

def plot[F[_], A](input: F[A])
                 (implicit ev: Source[F, A]): IO[Unit] = IO[Unit] {
  // do the actual plotting here
  ev.iterator(input).foreach(println)
}

plot(List(1,2,3)).unsafePerformIO()
plot(Stream(4, 5, 6, 7)).unsafePerformIO()