class Sprockets::Manifest

def save
  if @rename_filename
    logger.info "Renaming #{@filename} to #{@rename_filename}"
    FileUtils.mv(@filename, @rename_filename)
    @filename = @rename_filename
    @rename_filename = nil
  end
  data = json_encode(@data)
  FileUtils.mkdir_p File.dirname(@filename)
  PathUtils.atomic_write(@filename) do |f|
    f.write(data)
  end
end