Splits a string into lines so that the number characters in a line is less than or equal to a specified length. Individual words will only be split if the word itself has more characters than can fit on a line.

split.rb

def split string, length
	split = Array.new
	if string.length > length #if the string needs to be split
		string_words = string.split(" ")
		line = ""
		string_words.each do |x|
			if x.length > length #if the word needs to be split
				#add the start of the word onto the first line (even if it has already started)
				while line.length < length
					line += x[0]
					x = x[1..-1]
				end
				split << line
				#split the rest of the word up onto new lines
				split_word = x.scan(%r[.{1,#{length}}])
				split_word[0..-2].each do |word|
					split << word
				end
				line = split_word.last+" "
			elsif (line + x).length > length-1 #if the word would fit alone on its own line
				split << line.chomp
				line = x + " "
			else #if the word can be added to this line
				line += x + " "
			end
		end
		split << line
	else #if the string doesn't need to be split
		split = [string]
	end
	#give back the split line
	return split
end