private def transformDirectory()

in project/Protobuf.scala [139:168]
30 lines of code
7 McCabe index (conditional complexity)

  private def transformDirectory(
      sourceDir: File,
      targetDir: File,
      transformable: File => Boolean,
      transform: (File, File) => Unit,
      cache: File,
      log: Logger): File = {
    val runTransform = FileFunction.cached(CacheStoreFactory(cache), FilesInfo.hash, FilesInfo.exists) {
      (in: ChangeReport[File], out: ChangeReport[File]) =>
        val map = Path.rebase(sourceDir, targetDir)
        if (in.removed.nonEmpty || in.modified.nonEmpty) {
          log.info("Preprocessing directory %s...".format(sourceDir))
          for (source <- in.removed; target <- map(source)) {
            IO.delete(target)
          }
          val updated = for (source <- in.modified; target <- map(source)) yield {
            if (source.isFile) {
              if (transformable(source)) transform(source, target)
              else IO.copyFile(source, target)
            }
            target
          }
          log.info("Directory preprocessed: " + targetDir)
          updated
        } else Set.empty
    }
    val sources = sourceDir.allPaths.get.toSet
    runTransform(sources)
    targetDir
  }