# File lib/chef/knife/core/generic_presenter.rb, line 90
        def parse_format_option
          case config[:format]
          when "summary", /^s/, nil
            :summary
          when "text", /^t/
            :text
          when "json", /^j/
            :json
          when "yaml", /^y/
            :yaml
          when "pp", /^p/
            :pp
          else
            raise ArgumentError, "Unknown output format #{config[:format]}"
          end
        end