# File lib/sprockets/manifest.rb, line 110
    def compile(*args)
      unless environment
        raise Error, "manifest requires environment for compilation"
      end

      paths = environment.each_logical_path(*args).to_a +
        args.flatten.select { |fn| Pathname.new(fn).absolute? if fn.is_a?(String)}

      paths.each do |path|
        if asset = find_asset(path)
          files[asset.digest_path] = {
            'logical_path' => asset.logical_path,
            'mtime'        => asset.mtime.iso8601,
            'size'         => asset.bytesize,
            'digest'       => asset.digest
          }
          assets[asset.logical_path] = asset.digest_path

          target = File.join(dir, asset.digest_path)

          if File.exist?(target)
            logger.debug "Skipping #{target}, already exists"
          else
            logger.info "Writing #{target}"
            asset.write_to target
          end

          save
          asset
        end
      end
    end