class RSpec::Core::Formatters::Loader

def add(formatter_to_use, *paths)
  formatter_class = find_formatter(formatter_to_use)
  args = paths.map { |p| p.respond_to?(:puts) ? p : file_at(p) }
  formatter = formatter_class.new(*args)
  if @setup
    @reporter.register_listener formatter, *RSpec::Core::Reporter::NOTIFICATIONS
  end
  @formatters << formatter unless duplicate_formatter_exists?(formatter)
  formatter
end