class Gem::Indexer

def update_index
  make_temp_directories
  specs_mtime = File.stat(@dest_specs_index).mtime
  newest_mtime = Time.at 0
  updated_gems = gem_file_list.select do |gem|
    gem_mtime = File.stat(gem).mtime
    newest_mtime = gem_mtime if gem_mtime > newest_mtime
    gem_mtime >= specs_mtime
  end
  if updated_gems.empty? then
    say 'No new gems'
    terminate_interaction 0
  end
  specs = map_gems_to_specs updated_gems
  prerelease, released = specs.partition { |s| s.version.prerelease? }
  files = build_marshal_gemspecs specs
  Gem.time 'Updated indexes' do
    update_specs_index released, @dest_specs_index, @specs_index
    update_specs_index released, @dest_latest_specs_index, @latest_specs_index
    update_specs_index(prerelease,
                       @dest_prerelease_specs_index,
                       @prerelease_specs_index)
  end
  compress_indices
  verbose = Gem.configuration.really_verbose
  say "Updating production dir #{@dest_directory}" if verbose
  files << @specs_index
  files << "#{@specs_index}.gz"
  files << @latest_specs_index
  files << "#{@latest_specs_index}.gz"
  files << @prerelease_specs_index
  files << "#{@prerelease_specs_index}.gz"
  files = files.map do |path|
    path.sub(/^#{Regexp.escape @directory}\/?/, '') # HACK?
  end
  files.each do |file|
    src_name = File.join @directory, file
    dst_name = File.join @dest_directory, file # REFACTOR: duped above
    FileUtils.mv src_name, dst_name, :verbose => verbose,
                 :force => true
    File.utime newest_mtime, newest_mtime, dst_name
  end
end