Method declaration with decoration in Ruby

decoration.rb

module MethodDetector
  def option_stack
    @option_stack ||= []
  end

  def method_added(method_name)
    unless option_stack.empty?
      option = option_stack.pop
      puts "You added the option '#{option}' to the method: #{method_name}"
    end

    super
  end

  def add_option(option_name)
    option_stack << option_name
  end
end

class Vehicle
  extend MethodDetector

  add_option :logging
  def to_s

  end

  add_option :async
  def acquire

  end
end