gistfile1.scala

def time(f: => Unit) = {
  val t1 = System.currentTimeMillis
  f
  ((System.currentTimeMillis - t1)/1000.0)
}

def write(values: Array[(String, Int)], file: String) {
  val writer = new PrintWriter(new FileWriter(file))
  try {
    for ((x, y) <- values) {
      writer.println(x + "\t" + y)
    }
  } finally {
    writer.close()
  }
}

def processNewsgroups(rootDir: File): Unit = {
  val counts = Map.empty[String, Int]
  val pattern = """\W+""".r
   for (dir <- rootDir.listFiles if dir.isDirectory;
       file <- dir.listFiles;
       line <- Source.fromFile(file)(Codec.ISO8859).getLines();
       word <- pattern.split(line.toLowerCase)) {
    counts(word) = counts.getOrElse(word, 0) + 1
  }

  val array = counts.toArray
  write(array.sortWith { _._2 > _._2 }, "counts-descreasing-scala.txt")
  write(array.sortWith { _._1 < _._1 }, "counts-alphabetical-scala.txt")
}