# File lib/org-ruby/output_buffer.rb, line 138
    def do_custom_markup
      if File.exists? @options[:markup_file]
        load_custom_markup
        if @custom_blocktags.empty?
          no_valid_markup_found
        else
          set_custom_markup
        end
      else
        no_custom_markup_file_exists
      end
    end