Syntactic sugar for common idiom

ruby-talk
1

Hello everyone,

the following idiom is very useful:

module MyModule
  def self.append_features(base)
    super; base.extend(ClassMethods)
  end

  module ClassMethods

    def a_class_method
      puts 'class'
    end
  end
end

class MyClass
  include MyModule
end

MyClass.a_class_method # => 'class'

I think it would be a good idea to have some form of syntactic sugar
for this idiom in Ruby 1.9/2.0

Any ideas ?

-g.

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2

George Moschovitis wrote:

Hello everyone,

the following idiom is very useful:

module MyModule
    def self.append_features(base)
        super; base.extend(ClassMethods)
    end

    module ClassMethods

        def a_class_method
            puts 'class'
        end
    end
end

class MyClass
    include MyModule
end

MyClass.a_class_method # => 'class'

I think it would be a good idea to have some form of syntactic sugar
for this idiom in Ruby 1.9/2.0

Any ideas ?

Don't wait :slight_smile:

class Module
private
   def when_included_provide_class_methods(&bl)
     unless @__class_methods_module
       @__class_methods_module = Module.new

       def self.append_features(base)
         super
         base.extend(@__class_methods_module)
       end
     end

     @__class_methods_module.class_eval(&bl)
   end
end

module MyModule
   when_included_provide_class_methods {
     def a_class_method
         puts 'class'
     end
   }
end

class MyClass
   include MyModule
end

MyClass.a_class_method # => 'class'