Emacs hook when attempting to write a read-only buffer

Question

I'm looking to have a hook that triggers when a buffer marked read-only is attempted to be written. It's more of a convenience than necessary, I'm aware of Cx Cq which is currently where the function triggers (a Perforce p4-edit command), but it seems cleaner to do this when I begin to type (Much like the Visual Studio P4 plugin I believe).

Any help much appreciated as I've ran out of ideas.

Thanks, Jon.

Answer 1

This is an error which you can catch:

http://www.gnu.org/software/emacs/elisp/html_node/Handling-Errors.html