From: Hauke Rehfeld <hauke@haukerehfeld.de>
To: 46374@debbugs.gnu.org
Subject: bug#46374: Regression: erronous calls to PRED switch major-mode of unrelated modified buffers
Date: Sat, 28 Aug 2021 18:25:23 +0200 [thread overview]
Message-ID: <87r1ecilqn.fsf@haukerehfeld.de> (raw)
In-Reply-To: <878s7z4ihk.fsf@gmail.com>
Hmmm, I'm pretty sure the changes to `save-some-buffers` here
regarding the predicate indirection caused a regression and/or
very unexpected behavior that causes bugs in previously working
code.
Consider
`(save-some-buffers t (lambda () (derived-mode-p 'org-mode)))'
called from an org-mode buffer. It runs through the part of
`save-some-buffers' that is trying to resolve the PRED
indirection:
https://github.com/emacs-mirror/emacs/blob/692da8c6a82f8de376a2eec9304773b3e85205f3/lisp/files.el#L5792
``` emacs-lisp
;; Allow `pred' to be a function that returns a predicate
;; with lexical bindings in its original environment
(bug#46374).
(let ((pred-fun (and (functionp pred) (funcall pred))))
(when (functionp pred-fun)
(setq pred pred-fun)))
```
which evaluates the predicate to check if it returns a function --
which `(derived-mode-p)' does, as it simply returns the major-mode
symbol on success! In this case, it would be `#'org-mode'. So then
`org-mode' is called on any unsaved buffers as a PREDICATE,
switching those buffers to org-mode.
Compare this usage in org-mode, org.el:15357:
``` emacs-lisp
(defun org-save-all-org-buffers ()
"Save all Org buffers without user confirmation."
(interactive)
(message "Saving all Org buffers...")
(save-some-buffers t (lambda () (derived-mode-p 'org-mode)))
(when (featurep 'org-id) (org-id-locations-save))
(message "Saving all Org buffers... done"))
```
next prev parent reply other threads:[~2021-08-28 16:25 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-07 22:32 bug#46374: 28.0.50; Ask me to save buffers only if they are under callers dir Tino Calancha
2021-02-08 15:07 ` Eli Zaretskii
2021-02-08 15:47 ` Stefan Monnier
2021-02-09 17:50 ` Juri Linkov
2021-03-07 20:34 ` Tino Calancha
2021-03-07 21:08 ` Juri Linkov
[not found] ` <1952f2d9-51b6-a4ba-6c9e-98594222f017@gmail.com>
2021-03-08 17:28 ` Juri Linkov
2021-03-14 12:17 ` Tino Calancha
2021-03-15 17:10 ` Juri Linkov
2021-03-16 17:49 ` Juri Linkov
2021-03-16 22:54 ` Stefan Monnier
2021-03-16 23:37 ` bug#46374: [External] : " Drew Adams
2021-03-17 17:12 ` Juri Linkov
2021-03-17 17:10 ` Juri Linkov
2021-03-21 17:59 ` Tino Calancha
2021-03-21 20:10 ` Juri Linkov
2021-04-18 14:27 ` Tino Calancha
2021-04-24 22:13 ` Juri Linkov
2021-04-28 19:31 ` Tino Calancha
2021-04-28 19:51 ` Juri Linkov
2021-04-28 20:35 ` Tino Calancha
2021-04-29 9:17 ` Eli Zaretskii
2021-05-18 17:46 ` Tino Calancha
2021-04-29 16:04 ` Juri Linkov
[not found] ` <82abe5b9-7d42-b05d-26a5-fd63e1f59e3a@gmail.com>
2021-08-13 7:11 ` Juri Linkov
[not found] ` <3c7dc42a-e484-8068-d28d-49677f0b4a7@gmail.com>
2021-08-13 16:08 ` Juri Linkov
2021-04-29 9:16 ` Eli Zaretskii
2021-05-18 18:04 ` Tino Calancha
2021-05-18 18:23 ` Eli Zaretskii
2021-05-18 18:47 ` Tino Calancha
2021-08-28 16:25 ` Hauke Rehfeld [this message]
2021-08-29 16:38 ` bug#46374: Regression: erronous calls to PRED switch major-mode of unrelated modified buffers Juri Linkov
2021-08-30 7:28 ` Juri Linkov
2021-08-30 11:43 ` Hauke Rehfeld
2021-08-30 16:04 ` Hauke Rehfeld
2021-08-31 7:02 ` Juri Linkov
2021-09-05 10:09 ` bug#46374: 28.0.50; Ask me to save buffers only if they are under callers dir Tino Calancha
2021-09-05 16:21 ` Juri Linkov
2021-10-10 17:38 ` Juri Linkov
[not found] ` <jwv5yqwrgru.fsf-monnier+emacs@gnu.org>
2022-01-06 19:09 ` bug#46374: Regression: erronous calls to PRED switch major-mode of unrelated modified buffers Juri Linkov
2022-01-06 20:17 ` Eli Zaretskii
2022-01-06 20:28 ` Juri Linkov
2022-01-07 14:45 ` Eli Zaretskii
2022-01-10 3:18 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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