class Rack::Directory

def list_directory(path_info, path, script_name)
  url_head = (script_name.split('/') + path_info.split('/')).map do |part|
    Utils.escape_path part
  end
  # Globbing not safe as path could contain glob metacharacters
  body = DirectoryBody.new(@root, path, ->(basename) do
    stat = stat(::File.join(path, basename))
    next unless stat
    url = ::File.join(*url_head + [Utils.escape_path(basename)])
    mtime = stat.mtime.httpdate
    if stat.directory?
      type = 'directory'
      size = '-'
      url << '/'
      if basename == '..'
        basename = 'Parent Directory'
      else
        basename << '/'
      end
    else
      type = Mime.mime_type(::File.extname(basename))
      size = filesize_format(stat.size)
    end
    [ url, basename, size, type, mtime ]
  end)
  [ 200, { CONTENT_TYPE => 'text/html; charset=utf-8' }, body ]
end