added_method_metaprogramming.rb

module Magic
  def self.included(base)
    base.extend ClassMethods
  end  
  module ClassMethods
    def method_added(name)
      puts "instance method '#{name}' added"
    end  

    def singleton_method_added(name)
      puts "class method '#{name}' added"
    end
  end  
end

class Foo
  include Magic

  def bla  
  end

  def blubb
  end

  def self.foobar
  end
end