[R] Get a list of installed commands

[Data Monkey]

I'm pretty new to R, but have experience with other languages, both OO and scripting.

I'm trying to add support for R to my text editor of choice and to do this I need a list of installed commands I can markup with XML.
I'd then simply feed in the marked up list into my text editor's library and I'm off.

I've done this in Stata before using the following command:
getcmds using "~/Desktop/StataCommands.txt"

Does anyone know of a way to do this in R?

Any pointers much appreciated.

Thanks!