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Re: Debug on error and Emacs client

From: Lennart Borgman (gmail)
Subject: Re: Debug on error and Emacs client
Date: Wed, 16 May 2007 13:43:48 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20070326 Thunderbird/ Mnenhy/

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

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
                         (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
                       (let ((standard-output (current-buffer)))
                         (when errorp (princ "error: "))
                         (pp v)
(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.

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