cli.rb

  def cli(argv)
    old_stdout, old_stderr, old_argv = $stdout, $stderr, ARGV.dup
    os, es = StringIO.new, StringIO.new
    begin
      $stdout, $stderr = os, es
      ARGV.replace(argv.split)
      load(BIN_P)
      return [0, os.string, es.string]
    rescue Exception => boom # The binary uses exit(), we use that to preserve the output code
      return [boom.status, os.string, es.string] if boom.is_a?(SystemExit)
      raise boom
    ensure
      ARGV.replace(old_argv)
      $stdout, $stderr = old_stdout, old_stderr
    end
  end