Easier would be just uing pg_dump -s >schema.sql to get all schema objects so you could check them into subversion. If you want only specific objects, pg_dump -l >listofobjects, then edit this list as you like and use pg_dump -L listofobjects >someobjects.sql
The -l and -L options are not recognized on my server 8.3.I can use -t to iterate thru each table, but I don't see a way to do one function at a time.