On Mar 05, 2013, at 07:51 PM, Tom Browder wrote:

...

Yes, these are called "list styles". See the IStyle interface in src/mailman/interfaces/styles.py for the API and src/mailman/styles/default.py for the two built-in styles, both essentially legacy styles.

Ah, that's where it is! (And I assume ALL "attributes" are defined there.) But to my non-Python eyes I see only one actually defined.

There are two classes in default.py, LegacyDefaultStyle and LegacyAnnounceOnly, both of which have @implementer(IStyle) decorators. This is the way you declare that a class implements a particular interface, and it's how Mailman auto-discovers available styles.

But there is where we could add some other mailman-defined styles, correct?

Probably not. However, if we wanted to package some new "out-of-the-box" styles, we'd probably create a new module in that directory and add new classes there that declare they implement the IStyle.

But MM3 is designed to be extensible, so your own styles don't need to be in this package directory. As long as they are on Python's sys.path, and defined in your own mailman.cfg file, Mailman should be able to find them and allow them to be used.

Cheers, -Barry