gistfile1.scala

def load2(id1: String, id2: String) = Action {
    try {
        val dir = if (id1 == null) "" else id1.replaceAllLiterally("-", "_") + "."
        val file = id2.replaceAllLiterally("-", "_")

        val c = Class.forName("views.html.slides." + dir + file)
        val m = c.getMethod("render")
        Ok(m.invoke(null).asInstanceOf[Html])
    } catch {
        case e =>
            Ok(views.html.error.notfound())
    }
}