SBT task to create a distributable zip file

gistfile1.scala

trait DistributableProject extends BasicScalaProject with MavenStyleScalaPaths {
  // staging is currently done to make ensure the paths of the files within the resulting zip end up in the correct directory structure
  def stagingDir = (outputPath ##) / (normalizedName + "-" + version)

  def distributionZipName = normalizedName + "-dist-" + version + ".zip"

  def distributionOutputPath = outputPath / distributionZipName

  def libTargetDirectoryName = "lib"

  def libPaths = Path.lazyPathFinder {
    runClasspath.get.toList.filter(sbt.ClasspathUtilities.isArchive)
  } +++ mainDependencies.scalaJars

  // to ensure `libPaths` does not include source and doc jars
  override def classpathFilter = super.classpathFilter -- "*-sources.jar" -- "*-javadoc.jar"

  def nativeDirectoryName = "native"

  def nativeTargetDirectoryName = "native"

  def nativePaths = (info.projectPath ##) / nativeDirectoryName ** "*.dll"

  def mainJarPath = (outputPath ##) / defaultJarName

  def allPaths = mainJarPath +++ nativePaths +++ (stagingDir / libTargetDirectoryName ***)

  override def manifestClassPath = {
    val manifestString = libPaths.get.map {
      libTargetDirectoryName + File.separator + _.name
    }
    log.info("manifestString: " + manifestString)
    Some(manifestString.mkString(" "))
  }

  lazy val dist = distAction

  def distAction = task {
    FileUtilities.clean(distributionOutputPath, log)

    // staging
    log.debug("Included libs:" + libPaths.toString)
    FileUtilities.copyFlat(libPaths.get, stagingDir / libTargetDirectoryName, log)
    log.debug("Included native libs:" + nativePaths.toString)
    FileUtilities.copy(nativePaths.get, stagingDir / nativeTargetDirectoryName, true, false, log)
    log.debug("Included main jar:" + mainJarPath.toString)
    FileUtilities.copy(mainJarPath.get, stagingDir, true, false, log)

    log.debug("Creating output file:" + stagingDir.toString)
    FileUtilities.zip(stagingDir.get, distributionOutputPath, true, log)

    // cleanup
    FileUtilities.clean(stagingDir, log)

    None
  } dependsOn (test, `package`) describedAs ("Creates a distributable archive.")

}