R: debugging code from emacs using ess-tracebug?

Question

I want to use interactive debugging of R code in emacs, and found about ess-tracebug, but can't get it to work. I did the following:

1. Installed ess-tracebug
2. Started execution of an R script with ESS Cc Cn
3. Set up a breakpoint, now if I try to do Mc c , says "Debugging is not active"

Here is what I added to my ~/.emacs file:

(load "/home/user/ess/ess-5.13/lisp/ess-site")
(ess-toggle-underscore nil)
(add-to-list 'load-path "/home/user/emacs/")
(require 'ess-tracebug)
(add-hook 'ess-post-run-hook 'ess-tracebug t)
(define-key ess-mode-map "\M-]" 'next-error)
(define-key ess-mode-map "\M-[" 'previous-error)
(define-key inferior-ess-mode-map "\M-]" 'next-error-no-select)
(define-key inferior-ess-mode-map "\M-[" 'previous-error-no-select)

Any suggestions?

Answer 1

I assume you are running R in an Emacs buffer and you have your script in another buffer. In order to debug with ess-tracebug you must type Mx ess-tracebug to start the actual tracebug session.

This should do the job.