require 'tmpdir'
class Dir
  #a handy method to create a tmpdir, which cleans up after itself.
  # Dir.mktmp do |dir|
  #   puts "i'm doing neat stuff"
  # end
  #
  #Even if your block throws an exception, the temp directory will be deleted.
  def self.mktmp(prefix="tmpdir", &block)
    dirname = File.join(Dir.tmpdir, "%s.%s"%[prefix, Time.now.strftime("%s")])
    FileUtils.mkdir_p dirname
    begin
      yield dirname
    ensure
      FileUtils.rm_rf dirname
    end
    dirname
  end
end