I've been thinking about this a little bit and came up with the following
All plugin, that are going to be registered in API, will need a version number
or preferably two. A major and a minor version number. The major number will
only be incremented when a backward incompatible change is made. Method plugins
should be able to inherit version number from their parent object.
We should make it possible for plugins to define dependencies on other plugins.
This will be probably implemented as a list of tuples containing the plugin name
and a major version number. I was thinking about extracting the dependencies
automatically, but there doesn't seem to be an easy way to do this "from inside
the code". We could have an automated tool, that would validate plugins, checks
versions and fill in the dependencies... but that might be overkill.
Dependencies will be checked when API is finalizing.
Version number can be also used when registering plugins. Newer version will
automatically override older ones. This will also enable us, to make new
versions of plugins, that only extend a previous version. For example:
PLUGIN_VERSION = (1, 0)
class user_show(user_show): # this is legal even in the same file in python!
PLUGIN_VERSION = (1, 1)
# do something new here
api.register(user_show) # new version will override old one
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