From: Freeman Pascal <pascal@...>
Date: 2001-03-16T15:26:41+09:00
Subject: [ruby-talk:12717] RE:  Accessing caller of include or extend...

Hello again,

Using the info that Guy Decoux sent me about Module.append_features
I was able to answer both my original questions.  Here are the 
answers for any other Ruby newbies out there.

Q: When creating a module for inclusion by a class, is there
   a way to initialize module instance variables being added to the 
   including class?

A: Yes, simply provide an initialize() method in your module and 
   set your instance variables as you would in any class.  Also,
   be sure to call super in your initialize() method in both your
   class doing the including and the module you are including.

Q: Is there a way to determine within the module definition at 
   run-time who the including class is (i.e. who called "include")?

A: Yes - overriding the included modules append_features() method
   will allow you to determine the including class.

   [Credit to Guy Decoux who's code I lifted from his reply]

   #!/usr/bin/ruby
   module A
      def A.append_features(klass)
         puts "class #{klass}"
         super
      end
   end

   class B
      include A
   end
   pigeon% b.rb
   class B

-Freeman