SMS break messages | Twilio

message_break.rb

MAX_LINE_LENGTH = 80

# Gets long string as input
# Retruns array of splitted strings with (1/3)

def split_msg(message)
  length = message.length

  return [message] if length < MAX_LINE_LENGTH

  new_message = []
  temp_start = temp_end = 0

  length.times do |index|
    if message[index].eql?(' ')
      temp_end = index
    elsif index - temp_start >= MAX_LINE_LENGTH
      temp_end += 1
      new_message << message[temp_start, (temp_end - temp_start)]
      temp_start = temp_end
    end

    if index == length - 1
      new_message << message[temp_start, index - temp_start + 1]
    end
  end

  new_message.each.with_index(1) do |s, index|
    s << " " if !s[-1].eql?(' ')
    s << "(#{index}/#{new_message.length})" if s[-1].eql?(' ')
  end

  new_message
end

message = "Instead of routing texts through cell towers, your app sends messages  via helllo to the phones of nearby users, passing each message along from one phone to the next until it reaches the intended recipient"
puts split_msg(message)