[RFC] Plugin property API

[Robert Collins]

On Fri, 2009-07-17 at 12:47 +0200, Jelmer Vernooij wrote:
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> Robert proposed some interfaces for defining the properties of Bazaar
> plugins a while ago, as documented in doc/developers/plugin-api.txt.
> 
> I'm considering using this sort of information to automate the
> updating of the dependencies in the Debian Bazaar packages, and as
> such I plan to submit patches to add this information to the plugins
> that are part of the Debian archive at the moment.

That would be nice;).

> With the current infrastructure the minimum and maximum version of bzr
> that is supported will have to be specified in two places: __init__.py
> (a range of API versions that's supported) and setup.py (a mimimum and
> maximum bzrlib version). Since this information is updated regularly
> (pretty much every bzr version) I'd like to specify it only once, in
> setup.py.

setup.py is often not present in an installed plugin. By often, I mean
'I haven't seen one yet'. It is present in the special case of a 'bzr
branch to install', but not in install-via-packages plugins. And as
Aaron says a plugin is not required to be a directory, and when its not
there is no room for setup.py

If you want to make sure that the information is in one place, I suggest
placing it in e.g. version.py, and import that from setup, and the
specific plugins __init__.py.
...
> Also, would it perhaps make sense to merge the plugin-info into bzr
> core, maybe as hidden command for now ?

I'm neither for nor against doing that. I'd like to see it used,
expanded, and the hypothetical plugin db built though - and I think that
is possibly best done as a plugin.

-Rob
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