How to do DRY?

[tohagan]

I've noticed that most flavours of couchapp tools include a feature avoid code duplication.

The CouchDb guide shows that the original python couchapp used macros:

• http://guide.couchdb.org/draft/show.html#json
• http://guide.couchdb.org/draft/show.html#code

Does your tool support this or some other DRY mechanism ?