[Zope3-dev] Splitting package configuration

[Bernd Dorn]

On 23.05.2007, at 14:04, Stephan Richter wrote:

> Hi everyone,
>
> I built my first Zope 3 instance with buildout yesterday. After I  
> got an
> initial version working, I found it pretty lame to use  
> "zope.app.zcmlfiles".
> With "zope.app.zcmlfiles" I had 100 eggs without it 84 eggs (this  
> is somewhat
> project-specific.)
>
> However, I had to add several unneeded dependencies, because the
> main "configure.zcml" of a package usually also includes the
> browser "configure.zcml". For example, I have a dependency
> on "zope.app.form", just because "zope.app.securitypolicy" (and other
> packages) create old-style forms.
>
> In fact, I do not even use anything declared in  
> "IDefaultBrowserLayer", so any
> browser "configure.zcml" is totally overhead for in this case. In  
> fact,
> anyone creating a new skin from scratch will want to avoid the same  
> overhead.
>

+1 on the zcml splitting

note that the eggs still will have the same dependencies in setup.py,  
so the packages will be installed.


> I think the solution can be very simple and be effectively backward- 
> compatible
> for most cases:
>
> 1. Do not include the browser "configure.zcml" files in the
> main "configure.zcml" of that package.
>
> 2.
> (a) If the package has a SETUP.cfg and "package-configure.zcml",  
> then add the
> browser "configure.zcml" include to that "package-configure.zcml".
>
> (b) If the package is currently loaded via "zope.app.zcmlfiles"'s
> "configure.zcml", then we will add the browser "configure.zcml" there.
>
> This solution would not be fully backward-compatible with people  
> including
> package "configure.zcml" files manually. I think this is okay,  
> since people
> often do not even want the browser stuff.
>
> A fully backward solution would be to put all the generic package
> configuration in a new ZCML file and combine them both in  
> "configure.zcml".
> However, I find that solution very undesirable, so I hope noone  
> will like it
> either. :-)
>
> I would like to get this change started as soon as possible to make  
> it work
> for Zope 3.4. If noone objects, I will start with this in a few days.
>
> Regards,
> Stephan
> -- 
> Stephan Richter
> CBU Physics & Chemistry (B.S.) / Tufts Physics (Ph.D. student)
> Web2k - Web Software Design, Development and Training
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