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import sbt._
import Keys._
object Transform
{
lazy val transformResources = TaskKey[Seq[File]]("transform-resources")
lazy val inputResourceDirectories = SettingKey[Seq[File]]("input-resource-directories")
lazy val inputResourceDirectory = SettingKey[File]("input-resource-directory")
lazy val inputResources = TaskKey[Seq[File]]("input-resources")
lazy val resourceProperties = TaskKey[Map[String,String]]("resource-properties")
// to be replace by 0.10.1's fileMappings
lazy val fileMappings = TaskKey[Seq[(File,File)]]("file-mappings")
def configSettings = Seq(
inputResourceDirectory <<= sourceDirectory / "input_resources",
inputResourceDirectories <<= Seq(inputResourceDirectory).join,
inputResources <<= inputResourceDirectories.map(dirs => (dirs ** (-DirectoryFilter)).get ),
resourceProperties <<= defineProperties,
fileMappings in transformResources <<= transformMappings,
transformResources <<= (fileMappings in transformResources, resourceProperties) map { (rs, props) =>
rs map { case (in, out) => transform(in, out, props) }
},
resourceGenerators <+= transformResources
)
def transformMappings = (inputResources, inputResourceDirectories, resourceManaged) map { (rs, rdirs, rm) =>
(rs --- rdirs) x (rebase(rdirs, rm)|flat(rm)) toSeq
}
def defineProperties =
(organization, version, scalaVersion, Status.isSnapshot) map { (org, v, sv, isSnapshot) =>
Map("org" -> org, "sbt.version" -> v, "scala.version" -> sv, "repositories" -> repositories(isSnapshot).mkString(IO.Newline))
}
def transform(in: File, out: File, map: Map[String, String]): File =
{
def get(key: String): String = map.getOrElse(key, error("No value defined for key '" + key + "'"))
val newString = Property.replaceAllIn(IO.read(in), mtch => get(mtch.group(1)) )
if(Some(newString) != read(out))
IO.write(out, newString)
out
}
def read(file: File): Option[String] = try { Some(IO.read(file)) } catch { case _: java.io.IOException => None }
lazy val Property = """\$\{\{([\w.-]+)\}\}""".r
def repositories(isSnapshot: Boolean) = Releases :: (if(isSnapshot) Snapshots :: Nil else Nil)
lazy val Releases = typesafeRepository("releases")
lazy val Snapshots = typesafeRepository("snapshots")
def typesafeRepository(status: String) =
""" typesafe-ivy-%s: http://repo.typesafe.com/typesafe/ivy-%<s/, [organization]/[module]/[revision]/[type]s/[artifact](-[classifier]).[ext]""" format status
}
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