Some exercism and kata

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  object Colors {

    abstract class ColorSource {
      //generate colors from string once
      lazy val into: List[Color] = {
        val hx = hexes()
        println(hx)
        hx.map(Color.decode)
      }
      def hexes(): List[String]
      def random: Color = into(r.nextInt(into.length))
    }

    class Pastel extends ColorSource {
      def hexes(): List[String] = {
        import scala.sys.process._
        val result = (Seq("pastel", "random","-s",  "vivid") #| Seq("pastel", "format", "hex")).!!
        result.split("\n").toList
      }
    }

    class Gradient(from: String="ffffcc", to: String="fd8d3c", n: Int = 5) extends ColorSource {
      def hexes(): List[String] = {
        import scala.sys.process._
        val cmd = Seq("pastel", "gradient", "--colorspace", "HSL", from, to, "-n", n.toString) #| Seq("pastel", "format", "hex")
        println(cmd)
        val result = cmd.!!
        result.split("\n").toList
      }
    }

    class Fixed(cols: List[String]) extends ColorSource {
      def hexes(): List[String] = cols              
    }

    def pastel: ColorSource = new Pastel
    def gradient(from: String, to: String, n: Int) = new Gradient(from, to, n)
    def fixed(cols: List[String]) = new Fixed(cols)
	
	/** ... */
}