From: Trans <transfire@...>
Date: 2006-12-12T08:07:09+09:00
Subject: Re: bending ruby space


ara.t.howard@noaa.gov wrote:
> 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"]

ah. yes i know this pattern. though i prefer #class_extension myself.
still not quite what i'm after but your sample helped jog my brain in
the right direction --thanks.  i *think* this does it:

  module CompressUtils
    module_function
    ...
  end

  module FileUtils
    include CompressUtils
    module_function *(CompressUtils.private_instance_methods &
CompressUtils.methods(false))
  end

that seem about right?

t.