class RDoc::RDoc

def setup_output_dir(dir, force)
  flag_file = output_flag_file dir
  last = {}
  if File.exist? dir then
    error "#{dir} exists and is not a directory" unless File.directory? dir
    begin
      open flag_file do |io|
        unless force then
          Time.parse io.gets
          io.each do |line|
            file, time = line.split "\t", 2
            time = Time.parse(time) rescue next
            last[file] = time
          end
        end
      end
    rescue SystemCallError, TypeError
      error <<-ERROR
rectory #{dir} already exists, but it looks like it isn't an RDoc directory.
cause RDoc doesn't want to risk destroying any of your existing files,
u'll need to specify a different output directory name (using the --op <dir>
tion)
      ERROR
    end
  else
    FileUtils.mkdir_p dir
  end
  last
end