String#word_wrap for Ruby

usage.rb

text = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam"
puts text.word_wrap(40)

# Lorem ipsum dolor sit amet, consetetur
# sadipscing elitr, sed diam nonumy eirmod
# tempor invidunt ut labore et dolore
# magna aliquyam

word_wrap.rb

class String
  def word_wrap n
    words = self.split ' '
    str = words.shift
    words.each do |word|
      connection = (str.size - str.rindex("\n").to_i + word.size > n) ? "\n" : " "
      str += connection + word
    end
    str
  end
end