lazy val root = (project in file("."))
  .settings(
    libraryDependencies += ("net.liftweb" % "lift-webkit" % "1.0").intransitive(),
    libraryDependencies += ("org.scalacheck" % "scalacheck" % "1.5").intransitive(),
    autoScalaLibrary := false,
    managedScalaInstance := false,
    transitiveClassifiers := Seq("sources"),
    TaskKey[Unit]("checkSources") := (updateClassifiers map checkSources).value,
    TaskKey[Unit]("checkBinaries") := (update map checkBinaries).value,
  )

def getSources(report: UpdateReport)  = report.matching(artifactFilter(`classifier` = "sources") )
def checkSources(report: UpdateReport): Unit =
  {
    val srcs = getSources(report)
    if(srcs.isEmpty)
      sys.error(s"No sources retrieved\n\n$report")
    else if(srcs.size != 2)
      sys.error("Incorrect sources retrieved:\n\t" + srcs.mkString("\n\t"))
    else
      ()
  }

def checkBinaries(report: UpdateReport): Unit =
  {
    val srcs = getSources(report)
    if(srcs.nonEmpty) sys.error("Sources retrieved:\n\t" + srcs.mkString("\n\t"))
    else ()
  }
