gistfile1.rb

# Line size can be calculated with system stty command (it works on linux/unix 
# and windows):
#
#   `stty size`.split.last.to_i
#
def line_break(text, line_size, delim="\n")
  words, result, sum = text.split, [], 0
  words.each do |word|
    result << delim and sum=0 if (sum+word.size) > line_size
    result << word+" "
    sum += word.size+1
  end
  result.join
end