adornable

https://github.com/kjleitz/adornable

Adornable provides the ability to cleanly decorate methods in Ruby. You can make and use your own decorators, and you can also use some of the built-in ones that the gem provides. _Decorating_ methods is as simple as slapping a `decorate :some_decorator` above your method definition. _Defining_ decorators can be as simple as defining a method that yields to a block, or as complex as manipulating the decorated method's receiver and arguments, and/or changing the functionality of the decorator based on custom options supplied to it when initially applying the decorator.