GNU bug report logs - #46379
28.0.50; regression in lm-commentary, take two

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Package: emacs;

Reported by: Matt Armstrong <matt <at> rfc20.org>

Date: Mon, 8 Feb 2021 09:25:03 UTC

Severity: normal

Tags: confirmed, fixed, patch

Merged with 46364

Found in version 28.0.50

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#46379; Package emacs. (Mon, 08 Feb 2021 09:25:03 GMT) Full text and rfc822 format available.

Acknowledgement sent to Matt Armstrong <matt <at> rfc20.org>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Mon, 08 Feb 2021 09:25:03 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Matt Armstrong <matt <at> rfc20.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; regression in lm-commentary, take two
Date: Sun, 07 Feb 2021 16:03:54 -0800
This is a re-send of Bug#46364, which ended up closed by mutual
agreement without a clear description of the problem.

The issue is a behavior change in `lm-commentary' that probably deserves
some consideration, because it seems suboptimal in this example. The
behavior change is most likely caused by commit
963a9ffd66cb29f0370e9a4b854dddda242c54a6.

Prior to that commit, and in Emacs 27.1, the function returns the file's
commentary as an verbatim substring of the elisp source, including the
elisp comment characters, commentary headline, etc. E.g. a string like
this (I'll quote the string for email sanity):

> ";;; Commentary:
> ;;
> ;; This package extends and configures `dired' with features found in
> ;; almost all 'file managers', and also some unique features:
> ;;
> ;;   * Resilient dedicated dual-pane frame.
> ;;     * similar look to 'midnight commander'.
> ;;     * intelligent recovery of manually altered frame configuration
> ;;     * exit diredc/dired cleanly and totally
[...]

After that commit, the function returns a "sanitized" version of the
same content, such as:

> "
> This package extends and configures `dired' with features found in
> almost all 'file managers', and also some unique features:
> 
> * Resilient dedicated dual-pane frame.
> * similar look to 'midnight commander'.
> * intelligent recovery of manually altered frame configuration
> * exit diredc/dired cleanly and totally
[...]

The original Bug#46364 merely said the function "does not correctly
indent sub-headings." From the above, we can see this. Perhaps a clearer
way to say this would be that `lm-commentary' now seems to strip all
leading whitespace from every line, as a "sanitization" step, and this
has the unsatisfying side effect of ruining any indentation formatting
in the original commentary.

We need not go farther than Emacs' own lisp/align.el to see a similar
problem.

In Emacs 27, (lm-commentary "align.el") returns:

> ";;; Commentary:
> 
> ;; This mode allows you to align regions in a context-sensitive fashion.
> ;; The classic use is to align assignments:
> ;;
> ;;    int a = 1;
> ;;    short foo = 2;
> ;;    double blah = 4;
> ;;
> ;; becomes
> ;;
> ;;    int    a    = 1;
> ;;    short  foo  = 2;
> ;;    double blah = 4;
> 
> "

And in Emacs 28 (mainline):

> "This mode allows you to align regions in a context-sensitive fashion.
> The classic use is to align assignments:
> 
> int a = 1;
> short foo = 2;
> double blah = 4;
> 
> becomes
> 
> int    a    = 1;
> short  foo  = 2;
> double blah = 4;"

Perhaps this should be re-thought?

Note that Bug#46364 also mentioned MELPA, which is relevant only because
in some cases MELPA code calls `lm-commentary' to form user-facing
description of a package.



In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin20.2.0, NS appkit-2022.20 Version 11.1 (Build 20C69))
 of 2021-02-05 built on matts-mbp-2016.lan
Repository revision: 0484879d3b0f81222bacbc3c9655d1cfcdb5d321
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.1

Configured features:
ACL GMP GNUTLS JPEG LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER PNG THREADS
TIFF TOOLKIT_SCROLL_BARS ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
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  electric-pair-mode: t
  auto-insert-mode: t
  display-time-mode: t
  show-paren-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  icomplete-mode: t
  magit-auto-revert-mode: t
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  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
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  which-key-mode: t
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  auto-compression-mode: t
  temp-buffer-resize-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

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Memory information:
((conses 16 724471 37341)
 (symbols 48 55018 42)
 (strings 32 239918 4858)
 (string-bytes 1 7129508)
 (vectors 16 84926)
 (vector-slots 8 932975 39107)
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Merged 46364 46379. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Mon, 08 Feb 2021 09:38:02 GMT) Full text and rfc822 format available.

Added tag(s) patch. Request was from Matt Armstrong <matt <at> rfc20.org> to control <at> debbugs.gnu.org. (Mon, 08 Feb 2021 19:08:02 GMT) Full text and rfc822 format available.

Added tag(s) fixed. Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Tue, 09 Feb 2021 08:12:02 GMT) Full text and rfc822 format available.

bug marked as fixed in version 28.1, send any further explanations to 46364 <at> debbugs.gnu.org and "Basil L. Contovounesios" <contovob <at> tcd.ie> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Tue, 09 Feb 2021 08:12:02 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Tue, 09 Mar 2021 12:24:08 GMT) Full text and rfc822 format available.

This bug report was last modified 3 years and 19 days ago.

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