On Wed, Apr 6, 2011 at 6:58 AM, York Zhao <gtdplatform@gmail.com> wrote:

Never mind, just registered a new user and I can edit the page now. I've corrected a typing mistake in the bug "bn works, but bp doesn’t".
By the way, I'm very new to emacs and lisp and couldn't find in the source code where the ex command ":bn" is being handled. Could anybody here give me some idea?

Hey York,

The ex commands are stored in an association list (which is a key-value like data structure composed by a list of cells).

"bn" is an abbreviation for bnext. Run this:

(assoc "bnext" ex-token-alist)

;; ("bnext" "next")

So it's an alias... resolve again:

(assoc "next" ex-token-alist)

;; ("next" (ex-next ex-cycle-other-window))

So when you run the command "bn", ex expands to "bnext", then "next", and finally evaluates the code (ex-next ex-cycle-other-window)

Tim