classFileCount.sbt

import sjsonnew.BasicJsonProtocol._
import sbinary.DefaultProtocol._

val classFileCount = TaskKey[Int]("classFileCount")

Seq(Compile, Test).map { scope =>
  scope / classFileCount := {
    val s = streams.value.log
    val dir = (scope / classDirectory).value
    val current = (dir ** "*.class").get().size
    val id = thisProject.value.id
    val currentCount = s"[$id] current $current"
    (scope / classFileCount).previous match {
      case Some(previous) =>
        s.info(s"$currentCount, previous $previous, diff ${current - previous}")
      case None =>
        s.info(currentCount)
    }
    current
  }
}