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def ruby_exe(code, opts = {})
  body = code
  working_dir = opts[:dir] || "."
  Dir.chdir(working_dir) do
    if code and not File.exists?(code)
      if opts[:escape]
        code = "'#{code}'"
      else
        code = code.inspect
      end
      body = "-e #{code}"
    end
    cmd = [opts[:env_opts], RUBY_EXE, ENV['RUBY_FLAGS'], opts[:options], body, opts[:args]]
    `#{cmd.compact.join(' ')}`
  end
end