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Fri Jul 30 23:04:19 CEST 2010 · http://mail.python.org/pipermail/python-dev/2010-July/102569.html

At 04:37 PM 7/30/2010 +0200, Tarek Ziadé wrote:
>On Fri, Jul 30, 2010 at 4:04 PM, Barry Warsaw <barry at python.org> wrote:
>..
> > * Registration - How do third party plugins declare themselves to 
> exist, and
> >  be enabled?  Part of this seems to me to include interface declarations
> >  too.  Is installation of the plugin enough to register it?  How 
> do end users
> >  enable and disable plugins that me be registered on their system?  How do
> >  plugins describe themselves (provide short and log descriptions, declare
> >  options, hook into command line interfaces, etc.)?
> >
> > * Installation - How are plugins installed on the system?  Do they have to
> >  appear in a special directory on the file system?  Do they need special
> >  setup.py magic to write extra files?  Do they need to live in a 
> pre-defined
> >  namespace?
>
>FWIW We are thinking about adding in distutils2 a system quite similar
>to the entry points
>setuptools has, but with extra abilities for the end user :
>
>- activate / deactivate plugins without having to remove the project
>that added them
>- configure globally if plugins are implicitely activated or not --
>and maybe allow the distutils2 installer to ask the user
>   when a plugin is detected if he wants it activate or not
>- provide a tool to browse them

Note, by the way, that none of these are mutually exclusive to the 
entry point mechanism; it is simply up to an application developer to 
decide which of those features he/she wishes to provide.  A library 
that provides common implementations of such features on top of entry 
points would be a good idea.

pkg_resources already supplies one such tool, btw: the 
"find_plugins()" API for locating projects in one or more "plugin 
directories" that *could* be added to sys.path to provide plugins for 
an application.  It's then up to the application to filter this list 
further (e.g. via its own configuration).

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[Python-Dev] proto-pep: plugin proposal (for unittest)