class RDoc::Markup::ToRdoc

def wrap text
  return unless text && !text.empty?
  text_len = @width - @indent
  text_len = 20 if text_len < 20
  re = /^(.{0,#{text_len}})[ \n]/
  next_prefix = ' ' * @indent
  prefix = @prefix || next_prefix
  @prefix = nil
  @res << prefix
  while text.length > text_len
    if text =~ re then
      @res << $1
      text.slice!(0, $&.length)
    else
      @res << text.slice!(0, text_len)
    end
    @res << "\n" << next_prefix
  end
  if text.empty? then
    @res.pop
    @res.pop
  else
    @res << text
    @res << "\n"
  end
end