wrap

# File lib/rdoc/ri/ri_formatter.rb, line 305
    def wrap(txt,  prefix=@indent, linelen=@width)
      return unless txt && !txt.empty?

      txt = add_attributes_to(txt)
      next_prefix = prefix.tr("^ ", " ")
      linelen -= prefix.size

      line = []

      until txt.empty?
        word = txt.next_word
        if word.size + line.size > linelen
          write_attribute_text(prefix, line)
          prefix = next_prefix
          line = []
        end
        line.concat(word)
      end

      write_attribute_text(prefix, line) if line.length > 0
    end