build.sbt

val scalatest = "org.scalatest" %% "scalatest" % "3.1.1" % "test"
val junit = "junit" % "junit" % "4.12" % "test"
val scalameterCore = "com.storm-enroute" %% "scalameter-core" % "0.19" % "test"
val scalameter = "com.storm-enroute" %% "scalameter" % "0.19" % "test"

lazy val commonSettings = Seq(
  organization := "com.github.guillaumedd",
  version := "0.1.3",
  scalaVersion := "2.13.1",
  crossScalaVersions := Seq("2.11.12", "2.12.11", "2.13.1")
)

lazy val root = (project in file(".")).
  settings(commonSettings: _*).
  settings(
    name := "gstlib",
    libraryDependencies += scalatest,
    libraryDependencies += junit,
    libraryDependencies += scalameterCore,
    libraryDependencies += scalameter
  )

scalacOptions ++= {
  Seq("-deprecation", "-Ywarn-unused", "-Ywarn-dead-code") ++
    (CrossVersion.partialVersion(scalaVersion.value) match {
      case Some((2, n)) if n >= 12 => Seq("-opt:l:inline", "-opt-inline-from:**", "-Ywarn-unused:imports")
      case _ => Seq("-optimize", "-Ywarn-unused-import")
    })
}

unmanagedSourceDirectories in Compile ++= {
  (unmanagedSourceDirectories in Compile).value.map { dir =>
    CrossVersion.partialVersion(scalaVersion.value) match {
      case Some((2, n)) if n >= 13 => file(dir.getPath ++ "-2.13+")
      case _ => file(dir.getPath ++ "-2.13-")
    }
  }
}