SBT 0.10 dynamic scalac options

sbt-dynamic-scalac-options.scala

object StandardBuild {
  lazy val standardSettings: Seq[Project.Setting[_]] =
    Defaults.defaultSettings ++ compilerSettings

  lazy val scalacBaseOptions = SettingKey[Seq[String]]("scalac-base-options", "Options for the Scala Compiler in all modes")
  lazy val scalacSnapshotOptions = SettingKey[Seq[String]]("scalac-snapshot-options", "Options for the Scala Compiler in Development Mode")
  lazy val scalacReleaseOptions = SettingKey[Seq[String]]("scalac-release-options", "Options for the Scala Compiler in Release Build")

  lazy val compilerSettings: Seq[Project.Setting[_]] = Seq(
    scalacSnapshotOptions := Seq("-Xcheckinit"),
    scalacReleaseOptions := Seq(),
    scalacBaseOptions := Seq("-deprecation", "-unchecked"),
    scalacOptions <++= (version, scalacBaseOptions, scalacSnapshotOptions, scalacReleaseOptions).map {
      (v: String, baseOptions: Seq[String], snapOptions: Seq[String], releaseOptions: Seq[String]) =>
        baseOptions ++ (if (isSnapshot(v)) snapOptions else releaseOptions)
    }
  )

  private def isSnapshot(version: String) = version.trim.endsWith("-SNAPSHOT")
}

sbt-inspect.log

> inspect scalac-options
[info] Task
[info] Description:
[info] 	Options for the Scala compiler.
[info] Provided by:
[info] 	{file:/E:/code/payoff/}payoff/*:scalac-options
[info] Dependencies:
[info] 	{file:/E:/code/payoff/}payoff/*:version
[info] 	{file:/E:/code/payoff/}payoff/*:scalac-base-options
[info] 	{file:/E:/code/payoff/}payoff/*:scalac-snapshot-options
[info] 	{file:/E:/code/payoff/}payoff/*:scalac-release-options
[info] Delegates:
[info] 	{file:/E:/code/payoff/}payoff/*:scalac-options
[info] 	{file:/E:/code/payoff/}/*:scalac-options
[info] 	*/*:scalac-options
[info] Related:
[info] 	{file:/E:/code/payoff/}payoff/scalac-options
[info] 	*/*:scalac-options
[info] 	{file:/E:/code/payoff/}payoff/test:scalac-options