class Sprockets::Base

def each_logical_path(*args, &block)
  return to_enum(__method__, *args) unless block_given?
  filters = args.flatten
  files = {}
  each_file do |filename|
    if logical_path = logical_path_for_filename(filename, filters)
      unless files[logical_path]
        if block.arity == 2
          yield logical_path, filename.to_s
        else
          yield logical_path
        end
      end
      files[logical_path] = true
    end
  end
  nil
end