Hi Keith,

the following package on SqueakMap does quite a bit of automatic code
generation and transformation. It uses the model of the refactoring
browser to compose multiple methods into one and to allow pattern
matching on arguments and receiver of the method. Have a look at the
source code:

Functional Pattern Matching
http://map.squeak.org/package/3772b420-ba02-4fbd-ae30-8eadfc323b7b

Hope this helps,
Lukas

-- 
Lukas Renggli
http://www.lukas-renggli.ch