Syntactic sugar for common idiom

[George Moschovitis]

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.

 

[Joel VanderWerf]

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

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'