[ruby-core:31699] [Feature #3688] redef keyword for method redefinition in Ruby 2.0

Feature #3688: redef keyword for method redefinition in Ruby 2.0
http://redmine.ruby-lang.org/issues/show/3688

Author: Suraj Kurapati
Status: Open, Priority: Normal
Category: core, Target version: 2.0

Hello,

I saw Matz's Euroko 2010 keynote[1] where he mentioned adding the
ability to redefine methods gracefully in Ruby 2.0.  I mean, more
gracefully than this:

  class Hash
    # save the original method
    alias __original_initialize__ initialize

    # redefine the method
    def initialize(*args, &block)
      # do something extra ...

      # call the original method
      __original_initialize__(*args, &block)

      # do something more ...
    end
  end

I suggest adding a "redef" keyword to Ruby 2.0 for this purpose:

  class Hash
    # redefine the method
    redef initialize(*args, &block)
      # do something extra ...

      # call the original method
      super

      # do something more ...
    end
  end

The "redef" keyword should also have a twin "redefine_method" 
method for use in block-based metaprogramming:

  class Hash
    # redefine the method
    redefine_method :initialize do |*args, &block|
      # do something extra ...

      # call the original method
      super

      # do something more ...
    end
  end

Thanks for your consideration.

[1]: http://euruko2010.heroku.com/Matz-


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