From: ara.t.howard@...
Date: 2006-12-12T05:18:46+09:00
Subject: Re: bending ruby space

On Tue, 12 Dec 2006, Trans wrote:

> Exactly. Here let me give an actual example to help explain:
>
>  module CompressUtils
>    module_function
>    def tar_gz( folder, to_file=nil )
>      # ...
>    end
>  end
>
> I need CompressUtils to stay as is so as to work on it's own as a
> function module. But in one case I was thinking of doing:
>
>  module FileUtils
>    include_extend_or_whatever CompressUtils
>  end
>
> With the desired effect being is as if I had originially done:
>
>  module FileUtils
>    module_function
>    def tar_gz( folder, to_file=nil )
>      # ...
>    end
>  end
>
> t.

ah.  i use this alot, it's concise and extremely powerful:


   harp:~ > cat a.rb
   module CompressUtils
     module Methods
       def tar_gz folder, to_file=nil
         p [ folder, to_file ]
       end
     end
     module ClassMethods
       include Methods
     end
     module InstanceMethods
       include Methods
     end
     def self.included other
       other.module_eval{
         include InstanceMethods if defined? InstanceMethods
         extend ClassMethods if defined? ClassMethods
         def self.included other
           other.module_eval{
             include InstanceMethods if defined? InstanceMethods
             extend ClassMethods if defined? ClassMethods
           }
         end
       }
     end
   end

   module FileUtils
     include CompressUtils
   end

   FileUtils.tar_gz '/', 'a.tgz'

   include FileUtils
   tar_gz '/', 'a.tgz'
   self.class.tar_gz '/', 'a.tgz'


   harp:~ > ruby a.rb
   ["/", "a.tgz"]
   ["/", "a.tgz"]
   ["/", "a.tgz"]


-a
-- 
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if you want to be happy, practice compassion.  -- the dalai lama