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From: Richard Lawrence <richard.lawrence@uni-tuebingen.de>
To: Tim Cross <theophilusx@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: [PATCH] Fix org-comment-line-break-function (was: Is M-j broken for you in Org on Emacs 27 and 28?)
Date: Tue, 30 Nov 2021 18:03:42 +0100	[thread overview]
Message-ID: <87o861o9sh.fsf@aquinas.i-did-not-set--mail-host-address--so-tickle-me> (raw)
In-Reply-To: <87czmijtrp.fsf@gmail.com>

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Hi Tim and all,

Thanks for sticking with me here...

Tim Cross <theophilusx@gmail.com> writes:

> I just checked this when running emacs -Q and get the following
>
> comment-line-break-function is a variable defined in ‘simple.el’.
>
> Its value is ‘org-comment-line-break-function’
>
> and fill-prefix is
>
> fill-prefix is a variable defined in ‘simple.el’.
>
> Its value is nil

OK, those are the values I have too...

> and I don't get any error with M-j and cannot reproduce the issue you
> are encountering. .

Do you see an error if you explicitly call

(insert-before-markers-and-inherit nil)

?

Because that is what org-comment-line-break-function does when
fill-prefix is nil. That is the source of the error on all the versions
where I have reproduced it. If you don't see the error then, it would
indicate to me that something in your setup is suppressing it.

> Looking at the git log, I can only find these messages relating to
> default-indent-new-line
> ...
> which indicates the function was added in 2007 by RMS and made the
> default for M-j in 2019. 

Right, which is why I don't see it with M-j in Emacs 26, presumably.
Emacs 26.1, the version installed on my Debian system, was released May
28, 2018.

> my suspicion is that your org version is too old for the current Emacs
> versions... The other possibility is that you have a broken "mixed"
> installation of org.

I'm aware of the difficulties of a mixed installation and have been
careful to avoid them. I run Org from git, usually a recent pull of the
bugfix branch, which I load via use-package from my init file. But I
have also tested it with the built-in Org for various versions of Emacs
with emacs -Q. I do not have Org installed via ELPA.

Just to be extra, super sure, I built Emacs this afternoon from a
checkout of the repo, and the error is *still* there, with the same
cause. In that build, with emacs -Q, I have:

(org-version)
"9.5"

(emacs-version)
"GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5, cairo version 1.16.0)
 of 2021-11-30"

At this point I've replicated the bug on my machine in four different
builds of Emacs (version 26.1 from Debian, 27.2 and "emacs-next" from
Guix, and version 29.0.50 I built myself from source) with several
versions of Org (the built-in ones in these Emacsen and a recent build
of the bugfix branch). It is robustly reproducible for me, and the cause
is clear: default-indent-new-line calls org-comment-line-break-function,
which calls

(insert-before-markers-and-inherit nil)

which is a type error. I'm looking for help figuring out what the right
fix is. I attach a patch for the simplest fix I can think of; please let
me know if something else would be better.

-- 
Best,
Richard


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diff --git a/lisp/org.el b/lisp/org.el
index 1a1375461..fdeec0d67 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -19695,7 +19695,8 @@ non-nil."
   (save-excursion (forward-char -1) (delete-horizontal-space))
   (delete-horizontal-space)
   (indent-to-left-margin)
-  (insert-before-markers-and-inherit fill-prefix))
+  (when fill-prefix
+    (insert-before-markers-and-inherit fill-prefix)))
 
 
 ;;; Fixed Width Areas

  reply	other threads:[~2021-11-30 17:06 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-28 10:26 Is M-j broken for you in Org on Emacs 27 and 28? Richard Lawrence
2021-11-28 14:37 ` Greg Minshall
2021-11-28 14:45 ` Colin Baxter 😺
2021-11-28 20:17   ` Richard Lawrence
2021-11-29  1:18     ` Tim Cross
2021-11-29  8:09       ` Richard Lawrence
2021-11-29 13:35         ` Tim Cross
2021-11-29 15:49           ` Richard Lawrence
2021-11-29 14:31         ` Colin Baxter 😺
2021-11-30  1:10         ` Tim Cross
2021-11-30 17:03           ` Richard Lawrence [this message]
2021-11-30 20:18             ` [PATCH] Fix org-comment-line-break-function Marco Wahl
2021-11-30 22:06               ` Tim Cross
2021-12-01  8:36                 ` Marco Wahl
2021-11-30 22:08               ` Kaushal Modi
2021-11-30 23:15                 ` Tim Cross
2021-11-30 23:53                   ` Kaushal Modi
2021-12-01  1:44                   ` Kaushal Modi
2021-12-01  6:17                     ` Tim Cross
2021-12-01  8:16                       ` Richard Lawrence
2021-12-01 13:02                     ` Nicolas Goaziou
2021-12-04 22:23                     ` Tim Cross
2021-12-05  3:36                       ` Kaushal Modi
2021-12-05  9:14                         ` Nicolas Goaziou
2021-12-06 13:17                         ` Richard Lawrence
2021-12-06 13:51                           ` Kaushal Modi
2021-12-11 15:47                             ` Nicolas Goaziou
2021-11-30 17:16           ` Is M-j broken for you in Org on Emacs 27 and 28? Morgan Willcock
2021-11-29  8:22       ` Richard Lawrence

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