Smart way to truncate string strings in ruby based on number of chars. It enforces the maxium size, so you don't get validation errors

truncate.rb

module StringTruncate
    def string_truncate(string, max_size, terminator="...")
      size = 0
      words = []
      string.split.each do |word|
        size += word.size
        words << word
        break if size >= max_size
        size += 1
      end

      return words.join(" ") if size <= max_size

      plus_terminator_size = size + terminator.size
      return words.push(terminator).join(" ") if plus_terminator_size <= max_size

      while plus_terminator_size > max_size
        last_word = words.pop
        plus_terminator_size -= last_word.size + 1
      end

      words.join(" ") + terminator
    end
  end