import sbt._
	import Keys._
	import Scope.ThisScope

object Sxr
{
	val sxrConf = config("sxr") hide
	val sxr = TaskKey[File]("sxr")
	val sourceDirectories = TaskKey[Seq[File]]("sxr-source-directories")

	lazy val settings: Seq[Setting[_]] = inTask(sxr)(inSxrSettings) ++ baseSettings

	def baseSettings = Seq(
		libraryDependencies += "org.scala-sbt.sxr" % "sxr_2.10" % "0.3.0" % sxrConf.name
	)
	def inSxrSettings = Seq(
		managedClasspath := update.value.matching( configurationFilter(sxrConf.name) ).classpath,
		scalacOptions += "-P:sxr:base-directory:" + sourceDirectories.value.absString,
		scalacOptions += "-Xplugin:" + managedClasspath.value.files.filter(_.getName.contains("sxr")).absString,
		scalacOptions += "-Ystop-after:sxr",
		target := target.in(taskGlobal).value / "browse",
		sxr in taskGlobal <<= sxrTask
	)
	def taskGlobal = ThisScope.copy(task = Global)
	def sxrTask = (sources, target, scalacOptions, classpathOptions, scalaInstance, fullClasspath, streams) map { (srcs, out, opts, cpOpts, si, cp, s) =>
		val cache = s.cacheDirectory
		val outputDir = out.getParentFile / (out.getName + ".sxr")
		val f = FileFunction.cached(cache / "sxr", FilesInfo.hash) { in =>
			s.log.info("Generating sxr output in " + outputDir.getAbsolutePath + "...")
			IO.delete(out)
			IO.createDirectory(out)
			val comp = new compiler.RawCompiler(si, cpOpts, s.log)
			comp(in.toSeq.sorted, cp.files, out, opts)
			Set(outputDir)
		}
		f(srcs.toSet)
		outputDir
	}
}