Re: Debug on error and Emacs client

[Lennart Borgman (gmail)]

Juanma Barranquero wrote:
> On 5/16/07, Lennart Borgman (gmail) <address@hidden> wrote:
>
> > Sorry, I was using -n too, forgot that. With -n you do not see the error
> > anywhere.
>
> That's what I would expect. You're saying to emacsclient to no expect
> any answer, after all.
>
> You can always do:
>
>  emacsclient -n -e "(condition-case nil (my-bad-fun) (error
> (raise-frame) (backtrace)))"
>
> or something like that if you want to see errors in the server.


Would it not be easier if you get a normal backtrace if debug-on-error 
is t? Something like this can be used in server.el, server-process-filter:

             (if eval
                 (let* (errorp
                        (v
                         (if debug-on-error
                             (eval (car (read-from-string arg)))
                           (condition-case errobj
                               (eval (car (read-from-string arg)))
                             (error (setq errorp t) errobj)))))
                   (when v
                     (with-temp-buffer
                       (let ((standard-output (current-buffer)))
                         (when errorp (princ "error: "))
                         (pp v)
                         (ignore-errors
                           (process-send-region proc (point-min) 
(point-max)))
                         ))))

I have just added the (if debug-on-error ...) here. Maybe there should 
be another, server specific variable too so that one can have 
debug-on-error t without getting a backtrace for this case.