Fuzzy indentation in Clojure

[Raynes]

If you write a function, it looks like this:

(defn foo [x]
  (+ x x))

However, Clojure has macros, so defn isn't special at all. People define their own def functions all the time. An example is the popular web framework, Compojure:

(defroutes foo
  (GET "/" [] "Hello!"))

But codemirror tries to indent the above like so:

(defroutes foo
           (GET "/" [] "Hello World!"))

To solve this problem, the various editors for Clojure implement a rule where anything starting with def and with are indented in the same way as a defn form is indented. The Emacs mode and Vim plugin both do this. In Emacs, it is on by default (which I think is correct as this is the widely accepted convention) and it is optional in Vim.

It'd be great to have this in codemirror too. If it is on by default, even better.