# File lib/guard/rspec/runner.rb, line 62
      def parsed_or_default_formatter
        @parsed_or_default_formatter ||= begin
          # Use RSpec's parser to parse formatters
          formatters = ::RSpec::Core::ConfigurationOptions.new([]).parse_options()[:formatters]
          # Use a default formatter if none exists.
          # RSpec's parser returns an array in the format [[formatter, output], ...], so match their format
          formatters = [['progress']] if formatters.nil? || formatters.empty?
          # Construct a matching command line option, including output target
          formatters.map { |formatter| "-f #{formatter.join ' -o '}" }.join ' '
        end
      end