From: Matthias Pfeifer <pfemat@web.de>
To: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Function behaves differently when debugged
Date: Tue, 15 May 2018 00:34:53 +0200 [thread overview]
Message-ID: <CAPzsW6iqppdn513JStGMftjp2=bokvOuSCyzhX=sq-0Ouppv3g@mail.gmail.com> (raw)
Hi everybody,
I have this function
(defun mp-ibuffer-show-file-path ()
(interactive)
(let ((buf (ibuffer-current-buffer))
(lsoutput nil))
(if (not (null buf))
(when (file-exists-p (buffer-file-name buf))
(with-temp-buffer
(let* ((filename (buffer-file-name buf))
(file-directory (file-name-directory filename))
(just-filename (file-name-nondirectory filename)))
(setq lsoutput file-directory))))
(setq lsoutput "Buffer is not backed by a file"))
(message lsoutput)))
I bind it to some key in ibuffer-mode. it should print the path to a
buffer's file. When point is on a line of a buffer that is not backed by a
file (eg *Messages*) then i get this output:
wrong type argument: strinp, nil
However when I instantiated my defun for debugging and do the same again I
get
"Buffer is not backed by a file"
The second behavior is actually what i had expected when i was writing the
function. The first behavior is a bit unexpected. Also I do not understand
why my function behaves differently when my defun is debugged and when it
run without debugging.
Thanks for your help.
Matthias
next reply other threads:[~2018-05-14 22:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-14 22:34 Matthias Pfeifer [this message]
[not found] <mailman.3.1526337298.20804.help-gnu-emacs@gnu.org>
2018-05-15 14:48 ` Function behaves differently when debugged Ralf Fassel
2018-05-21 21:34 ` Robert L.
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