From: "Lennart Borgman (gmail)" <lennart.borgman@gmail.com>
To: Emacs Devel <emacs-devel@gnu.org>
Subject: Re: Feature request: A way to get a traceback to a buffer or a string
Date: Tue, 11 Dec 2007 11:12:46 +0100 [thread overview]
Message-ID: <475E629E.4040302@gmail.com> (raw)
In-Reply-To: <475DE033.6060403@gmail.com>
Lennart Borgman (gmail) wrote:
> In some situations you may know that a function call will cause an
> error. You may then want to get a traceback from this particular call,
> without user intervention. I have attached a macro that can give this. I
> would find it practical if this were included in Emacs.
>
> (defmacro mumamo-get-backtrace (bodyform)
> "Evaluate BODYFORM, return backtrace as a string.
> If there is an error in BODYFORM then return the backtrace as a
> string, otherwise return nil."
> `(let ((debugger (lambda (&rest debugger-args)
> (setq debugger-ret (with-output-to-string
> (backtrace)))))
> (debug-on-error t)
> (debug-on-signal t)
> (debugger-ret nil))
> (condition-case err
> (progn
> ,bodyform
> nil)
> (error
> (let* ((errmsg (error-message-string err))
> (debugger-lines (split-string debugger-ret "\n"))
> (dbg-ret (mapconcat 'identity (nthcdr 6 debugger-lines)
> "\n")))
> (concat errmsg "\n" dbg-ret))))))
The code above does not give a backtrace always, but I think this will:
(defmacro mumamo-get-backtrace-if-error (bodyform)
"Evaluate BODYFORM, return a list with error message and backtrace.
If there is an error in BODYFORM then return a list with the
error message and the backtrace as a string. Otherwise return
nil."
`(let* ((debugger
(lambda (&rest debugger-args)
(let ((debugger-ret (with-output-to-string (backtrace))))
;; I believe we must put the result in a buffer,
;; otherwise `condition-case' might erase it:
(with-current-buffer (get-buffer-create "TEMP GET
BACKTRACE")
(erase-buffer)
(insert debugger-ret)))))
(debug-on-error t)
(debug-on-signal t))
(condition-case err
(progn
,bodyform
nil)
(error
(let* ((errmsg (error-message-string err))
(dbg1-ret
(with-current-buffer
(get-buffer "TEMP GET BACKTRACE") (buffer-string)))
;; Remove lines from this routine:
(debugger-lines (split-string dbg1-ret "\n"))
(dbg-ret (mapconcat 'identity (nthcdr 6 debugger-lines)
"\n"))
)
(list errmsg (concat errmsg "\n" dbg-ret)))))))
next prev parent reply other threads:[~2007-12-11 10:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-11 0:56 Feature request: A way to get a traceback to a buffer or a string Lennart Borgman (gmail)
2007-12-11 10:12 ` Lennart Borgman (gmail) [this message]
2007-12-11 19:01 ` Richard Stallman
2007-12-12 1:24 ` Lennart Borgman (gmail)
2007-12-12 12:53 ` Johan Bockgård
2007-12-12 15:21 ` Stefan Monnier
2007-12-12 16:52 ` Lennart Borgman (gmail)
2007-12-12 22:52 ` Richard Stallman
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