[Grok-dev] Re: Autoincluding ZCML for package dependencies

Tres Seaver tseaver at palladion.com
Tue Jan 22 11:56:58 EST 2008

Hash: SHA1

Martijn Faassen wrote:
> Hey Ethan,
> Ethan Jucovy wrote:
>> My colleague Robert Marianski and I are at the Snow Sprint and we've
>> been having a lot of fun looking at Grok.  We've been working with
>> Martijn for the past couple of days on a package to automatically
>> include ZCML for a project's required dependencies (by looking at
>> `install_requires`) to eliminate the need for redundant "<include
>> package='...'>"s.  I've just written a blog post about this code and
>> our work on it which I thought some of you might be interested in
>> (here: http://www.openplans.org/projects/opencore/blog/2008/01/21/automatic-inclusion-of-zcml/
>> ).  
> For people following along, we hope to land this feature in Grok at some 
> point (post-sprint, probably, but perhaps pre-1.0?). This feature will 
> allow people to just add dependencies to their setup.py without having 
> to worry managing includes of ZCML. This should make reuse of existing 
> components a bit easier -- it's one less thing to forget --, and that's 
> good, right?

Right up to the point that it is hell (like Zope2's DWIM),  Can we do
this by adding a setuptools plugin / entry point handler which at least
requires an explicit gesture in the setup.py?  We wouldn't be repeating
ourselves (by requiring an <include/> tag in the ZCML), but it would be
explicit.  E.g.:

 from setuptools import setup
 setup(# ...

If the plugin is installed, it would look for the keyword in the
arguments to setup, and do the Right THing.  Or perhaps it could be
signalled via an import:

    import megrok.majyk
 except ImportError:
    pass # extension not installed, user must manually configure ZCML

Or setup.py could declare a convention for entry points which signalled
that dependencies were to be automagically configured:

          'grok.zcml_majyk': '*',

The last would likely be handled by registering a subscriber for
application startup, which would then use pkg_reousces to query the
named entry points and find the dependencies.

- --
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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