From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2005-12-03T01:47:32+09:00
Subject: Re: Dynamic Modules

Daniel Schierbeck wrote:
> Daniel Schierbeck wrote:
>> Trans wrote:
>>> I would like to discuss the merits/non-merits and the best approach to
>>> implementation of "dynamic modules" --modules that take parameters at
>>> the time of include, thus altering their behavior per include. The
>>> common denominator here is the altered interface of #include:
>>>
>>>   include AModule, :opt1 => :val1, :opt2 => :val2
>>>
>>> Here's a simple example based on the implementation I (and friends) put
>>> together
>>>
>>>    module Mixin
>>>
>>>      dynamic_feature do |options|
>>>
>>>          define_method :hello do
>>>            puts "Hello from #{options[:name]}"
>>>          end
>>>
>>>      end
>>>
>>>    end
>>>
>>>    class MyClass
>>>      include Mixin, :name => 'Ruby'
>>>    end
>>>
>>>    m = MyClass.new
>>>    m.hello -> 'Hello from Ruby'
>>>
>>>    class MyClass2
>>>      include Mixin, :name => 'Tom'
>>>    end
>>>
>>>    m = MyClass2.new
>>>    m.hello -> 'Hello from Tom'
>>>
>>> T.
>>>
>>
>> I'd rather see this:
>>
>>   class Module
>>     def include(mod, *args, &block)
>>       mod.send :append_features, self
>>       if mod.respond_to? :included
>>         mod.included(self, *args, &block)
>>       end
>>     end
>>   end
>>
>>   module Chewable
>>     def self.included(klass, *args)
>>       puts "Included in #{klass} with the following args:"
>>       args.each { |arg| puts " * #{arg.inspect}" }
>>     end
>>   end
>>
>>   class Klass
>>     include Chewable "foo", "bar", "baz"
>>   end
>>
>>
>> Cheers,
>> Daniel
> 
> That should of course be `include Chewable, "foo"...'

Current implementation:

   class Module
     def include(mod, *args, &block)
       mod.send :append_features, self
       if mod.respond_to? :included
         mod.included(self, *args, &block)
       end
     end
   end

   class Class
     def is(*mods)
       mods.each { |mod| include mod }
     end
   end


   class Klass
     is Chewable, Digestible
     include MyModule, "foo", "bar", "baz"
   end