SBT: MaxPermSize or MaxMetaspaceSize according to the current Java version

gistfile1.scala

javaOptions in (Test, test) := {
  val versionParse = """(\d+)\.(\d+)""".r
  val permOrMetaspace = 
    sys.props ("java.specification.version") match {
      case versionParse (maj, min) =>
        val major = maj.toInt
        val minor = min.toInt
        if (major > 1 || major == 1 && minor >= 8) "Metaspace" else "Perm"
      case _ =>
        sys.error ("Unable to determine Java version")
    }
  Seq("-Xmx256m", s"-XX:Max${permOrMetaspace}Size=128M")
}