From: Trans <transfire@...>
Date: 2006-08-29T13:55:04+09:00
Subject: Re: Partial append_features?


Ola Bini wrote:
> Hi,
>
> I'm looking for a way to copy methods from a Module, or specify more
> directly which methods get included in a class. More or less, I would
> like to be able to do something like this:
>
> module Foo
>    def do_one_thing
>    end
>    def do_second
>    end
>    def do_third
>    end
> end
>
> class Bar
>    append_from Foo, :do_second, :do_third
> end
>
> or
> module Baz
>    append_from Foo, :do_second, :do_third
> end
>
> and I would have a module Baz which could be included, without having
> do_one_thing included.
>
> Is this possible in Ruby right now? My first approach was to get the
> UnboundMethod instance_method from the Module, but I couldn't find a way
> to attach these to an unrelated class since UnboundMethod must have a
> is_a?-relationship with the binding object.

Try Facets' module/integrate.rb  Here's the doc:

# Using integrate is just like using include except the
# module included is a reconstruction of the one given
# altered via commands in the block.
#
# Convenient commands available are: #rename, #redef,
# #remove, #nodef and #wrap. But any module method
# can be used.
#
#   module W
#     def q ; "q" ; end
#     def y ; "y" ; end
#   end
#
#   class X
#     integrate W do
#       nodef :y
#     end
#   end
#
#   x = X.new
#   x.q  #=> "q"
#   x.y  #=> missing method error
#
# This is like #revisal, but #revisal only
# returns the reconstructred module. It does not
# include it.

http://facets.rubyforge.org

T.