bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Maxim Cournoyer]

Hi,

After updating from Emacs 27 to Emacs 28 via GNU Guix, I noticed the
following change in behavior while attempting to indent a blob of text
in a Guix package definition (Scheme source):

;; Emacs 27
    (description "IBus-Anthy is an engine for the input bus \"IBus\").  It
adds the Anthy Japanese language input method to IBus.  Because most graphical
applications allow text input via IBus, installing this package will enable
Japanese language input in most graphical applications.")

;; Emacs 28
    (description "IBus-Anthy is an engine for the input bus \"IBus\").  It adds the Anthy
Japanese language input method to IBus.  Because most graphical applications
allow text input via IBus, installing this package will enable Japanese
language input in most graphical applications.")

I traced it down to commit 9bf367e1848:

    Improve filling of Emacs Lisp doc strings
    
    * lisp/emacs-lisp/lisp-mode.el (lisp-fill-paragraph): When filling
    a Lisp string, try to avoid filling bits that follow it
    (bug#28937).

Simply commenting out the newly added block, evaluating the defun and
running it on my example reverts to the previous correct behavior.

Thanks,

Maxim

---

In GNU Emacs 28.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101002
System Description: Guix System

Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash
 SHELL=/gnu/store/4y5m9lb8k3qkb1y9m02sw9w9a6hacd16-bash-minimal-5.1.8/bin/bash
 --prefix=/gnu/store/q6x17s6zcgv52sdz3gh69b7g0d9712z8-emacs-28.1
 --enable-fast-install --with-modules --with-cairo
 --disable-build-details'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER
PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM
GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: /home/maxim/.guix-profile/share/emacs/site-lisp:/gnu/store/q6x17s6zcgv52sdz3gh69b7g0d9712z8-emacs-28.1/share/emacs/28.1/lisp
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Debbugs

Minor modes in effect:
  TeX-PDF-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  pyvenv-mode: t
  shell-dirtrack-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  emms-mode-line-mode: t
  emms-playing-time-display-mode: t
  emms-playing-time-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  counsel-mode: t
  ivy-mode: t
  global-so-long-mode: t
  recentf-mode: t
  global-company-mode: t
  company-mode: t
  electric-pair-mode: t
  savehist-mode: t
  winner-mode: t
  display-time-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
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bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Lars Ingebrigtsen]

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> ;; Emacs 28
>     (description "IBus-Anthy is an engine for the input bus \"IBus\").  It adds the Anthy
> Japanese language input method to IBus.  Because most graphical applications
> allow text input via IBus, installing this package will enable Japanese
> language input in most graphical applications.")

[...]

> Simply commenting out the newly added block, evaluating the defun and
> running it on my example reverts to the previous correct behavior.

I'm not sure the previous behaviour was any more correct.  It's now
filling that string as if it, well, is a string, so that if you insert
it somewhere, the lines have similar lengths.  The previous behaviour
was to fill "what you see in the buffer", which is wrong in most
contexts.

So I don't know.  Anybody have an opinion?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Eli Zaretskii]

> Cc: 56197@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Sat, 25 Jun 2022 13:53:44 +0200
> 
> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
> 
> > ;; Emacs 28
> >     (description "IBus-Anthy is an engine for the input bus \"IBus\").  It adds the Anthy
> > Japanese language input method to IBus.  Because most graphical applications
> > allow text input via IBus, installing this package will enable Japanese
> > language input in most graphical applications.")
> 
> [...]
> 
> > Simply commenting out the newly added block, evaluating the defun and
> > running it on my example reverts to the previous correct behavior.
> 
> I'm not sure the previous behaviour was any more correct.  It's now
> filling that string as if it, well, is a string, so that if you insert
> it somewhere, the lines have similar lengths.  The previous behaviour
> was to fill "what you see in the buffer", which is wrong in most
> contexts.
> 
> So I don't know.  Anybody have an opinion?

I actually don't understand what kind of "Lisp code" is the above
snippet.  It doesn't look to me as valid Lisp code.  So there's no
criteria for judging the correctness here, it seems.

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> I actually don't understand what kind of "Lisp code" is the above
> snippet.  It doesn't look to me as valid Lisp code.  So there's no
> criteria for judging the correctness here, it seems.

It's just (foo "... very long multiline string").  I was also confused,
because the string looked very odd -- it has a ) inside the string, but
no (, but that's not really relevant.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> It's just (foo "... very long multiline string").  I was also confused,
> because the string looked very odd -- it has a ) inside the string, but
> no (, but that's not really relevant.

Oh, hang on -- there definitely is a bug here.  Here's a better test case:

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very long line This is a very long line This is a very long line.
And another long line.")

`M-q' in the first line does nothing, and it should.  I'll have a look.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> `M-q' in the first line does nothing, and it should.  I'll have a look.

I've now fixed that, but the question still remains -- should

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very long line This")

be filled as

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very
long line This")

(i.e., fill the string using fill-column, or

(foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a
very long line This is a very long line This is a very long line This")

(i.e., fill the text as is in the buffer).

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Stefan Kangas]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> I've now fixed that, but the question still remains -- should
>
> (foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very long line This")
>
> be filled as
>
> (foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a very long line This is a very long line This is a very
> long line This")
>
> (i.e., fill the string using fill-column, or
>
> (foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot-foo-bar-zot "This is a
> very long line This is a very long line This is a very long line This")
>
> (i.e., fill the text as is in the buffer).

The former sounds more useful, IMO.  I don't want to mess up my strings
just to have pretty source code; I can make such adjustments manually
when I need to.

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Lars Ingebrigtsen]

Stefan Kangas <stefan@marxist.se> writes:

> The former sounds more useful, IMO.  I don't want to mess up my strings
> just to have pretty source code; I can make such adjustments manually
> when I need to.

So the votes are in, and I guess we'll keep the current behaviour in
Emacs 29, and I'm therefore closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> So the votes are in, and I guess we'll keep the current behaviour in
> Emacs 29, and I'm therefore closing this bug report.

Or -- perhaps it should be backported to Emacs 28 -- but not right now,
since the release is impending.  So I'll keep this open until after
Emacs 28.2, I think.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Stefan Kangas]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
>> So the votes are in, and I guess we'll keep the current behaviour in
>> Emacs 29, and I'm therefore closing this bug report.
>
> Or -- perhaps it should be backported to Emacs 28 -- but not right now,
> since the release is impending.  So I'll keep this open until after
> Emacs 28.2, I think.

Emacs 28 was released on 2022-04-04, so I'm closing this bug now.

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Maxim Cournoyer]

Hi Stefan,

Stefan Kangas <stefankangas@gmail.com> writes:

> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
>> Lars Ingebrigtsen <larsi@gnus.org> writes:
>>
>>> So the votes are in, and I guess we'll keep the current behaviour in
>>> Emacs 29, and I'm therefore closing this bug report.
>>
>> Or -- perhaps it should be backported to Emacs 28 -- but not right now,
>> since the release is impending.  So I'll keep this open until after
>> Emacs 28.2, I think.
>
> Emacs 28 was released on 2022-04-04, so I'm closing this bug now.

The issue says "regressed in", not "affects only", for what it's worth.
The regression/change in behavior still applies to the current release
of Emacs.

-- 
Thanks,
Maxim

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Eli Zaretskii]

> From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
> Cc: Lars Ingebrigtsen <larsi@gnus.org>,  Eli Zaretskii <eliz@gnu.org>,
>   56197-done@debbugs.gnu.org
> Date: Sat, 28 Dec 2024 14:52:52 +0900
> 
> Hi Stefan,
> 
> Stefan Kangas <stefankangas@gmail.com> writes:
> 
> > Lars Ingebrigtsen <larsi@gnus.org> writes:
> >
> >> Lars Ingebrigtsen <larsi@gnus.org> writes:
> >>
> >>> So the votes are in, and I guess we'll keep the current behaviour in
> >>> Emacs 29, and I'm therefore closing this bug report.
> >>
> >> Or -- perhaps it should be backported to Emacs 28 -- but not right now,
> >> since the release is impending.  So I'll keep this open until after
> >> Emacs 28.2, I think.
> >
> > Emacs 28 was released on 2022-04-04, so I'm closing this bug now.
> 
> The issue says "regressed in", not "affects only", for what it's worth.
> The regression/change in behavior still applies to the current release
> of Emacs.

We don't agree it's a regression, as shown in the discussion of this
bug.

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Maxim Cournoyer]

Hello Eli,

Eli Zaretskii <eliz@gnu.org> writes:

[...]

>> > Emacs 28 was released on 2022-04-04, so I'm closing this bug now.
>> 
>> The issue says "regressed in", not "affects only", for what it's worth.
>> The regression/change in behavior still applies to the current release
>> of Emacs.
>
> We don't agree it's a regression, as shown in the discussion of this
> bug.

We can call it 'change in behavior'; I agree in most cases the new
behavior is probably good.  I don't see us being in disagreement; I
think Felix and I are pointing that the change has impacted negatively
at least one use case, and we're exploring ideas for a better solution
to that than pasting the previous copy in a project's .dir-locals.el
file (I'll explain in your other question why I see this as suboptimal).

-- 
Thanks,
Maxim

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Stefan Kangas]

reopen 56197
thanks

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Hi Stefan,
>
> Stefan Kangas <stefankangas@gmail.com> writes:
>
>> Emacs 28 was released on 2022-04-04, so I'm closing this bug now.
>
> The issue says "regressed in", not "affects only", for what it's worth.
> The regression/change in behavior still applies to the current release
> of Emacs.

Sorry for misunderstanding.  I'm reopening the bug with this message.

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Maxim Cournoyer]

On June 30, 2022 5:32:08 AM EDT, Lars Ingebrigtsen <larsi@gnus.org> wrote:
>Stefan Kangas <stefan@marxist.se> writes:
>
>> The former sounds more useful, IMO.  I don't want to mess up my strings
>> just to have pretty source code; I can make such adjustments manually
>> when I need to.
>
>So the votes are in, and I guess we'll keep the current behaviour in
>Emacs 29, and I'm therefore closing this bug report.
>

Just to make sure, this means the paragraph filling behavior seen in the examples I shared would be unchanged, and different from that in Emacs 27 and earlier, correct?

To me, the previous behavior was useful; is there a way to configure Emacs to behave that way with Emacs 28?

Thank you!

Maxim
Hi,

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Lars Ingebrigtsen]

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Just to make sure, this means the paragraph filling behavior seen in
> the examples I shared would be unchanged, and different from that in
> Emacs 27 and earlier, correct?

Yup.

> To me, the previous behavior was useful; is there a way to configure
> Emacs to behave that way with Emacs 28?

I guess you can set fill-paragraph-function to a function that does what
you want?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Felix Lechner via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hi everyone,

> fill the string using fill-column, or [...] fill the text as is in the
> buffer

> It's now filling that string as if it, well, is a string, so that if
> you insert it somewhere, the lines have similar lengths.  The previous
> behaviour was to fill "what you see in the buffer"

> The former sounds more useful, IMO.  I don't want to mess up my strings
> just to have pretty source code

Filling strings in code would be useful, but isn't that a separate,
don't-break-my-strings feature?

Historically, the point of text justification is to make text fit on a
screen.  For example, the documentation for fill-region refers to
columns, which are features of buffers:

    Column beyond which automatic line-wrapping should happen.

Auto-fill-mode is consistent:

    inserting a space at a column beyond current-fill-column
    automatically breaks the line

In a grand sweep, the manual explains what needs to fit where:

    “Filling” text means breaking it up into lines that fit a specified
    width.

Section 26.6.2 ("Explicit Fill Commands") is even more, well, explicit:

    The command ‘M-q’ (‘fill-paragraph’) “fills” the current paragraph.
    It redistributes the line breaks within the paragraph, and deletes
    any excess space and tab characters occurring within the paragraph,
    in such a way that the lines end up fitting within a certain maximum
    width.

How text shows on a screen is clearly a central feature.  The manual
continues:

    The maximum line width for filling is specified by the buffer-local
    variable ‘fill-column’.  The default value (*note Locals::) is 70.
    The easiest way to set ‘fill-column’ in the current buffer is to use
    the command ‘C-x f’ (‘set-fill-column’).  [...]  Note that, by its
    very nature, ‘fill-column’ is measured in column units; the actual
    position of that column on a graphical display depends on the font
    being used.  In particular, using variable-pitch fonts will cause
    the ‘fill-column’ occupy different horizontal positions on display
    in different lines.

In my view, the string interpretation calls for a different, though
related feature.

Maybe there could be (setq fill-strings-instead-of-text t) ?  Thanks!

Kind regards
Felix

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Eli Zaretskii]

> From: Felix Lechner <felix.lechner@lease-up.com>
> Cc: Maxim Cournoyer <maxim.cournoyer@gmail.com>, Stefan Kangas
>  <stefankangas@gmail.com>, Eli Zaretskii <eliz@gnu.org>, Lars Ingebrigtsen
>  <larsi@gnus.org>
> Date: Wed, 25 Dec 2024 12:15:44 -0800
> 
> > fill the string using fill-column, or [...] fill the text as is in the
> > buffer
> 
> > It's now filling that string as if it, well, is a string, so that if
> > you insert it somewhere, the lines have similar lengths.  The previous
> > behaviour was to fill "what you see in the buffer"
> 
> > The former sounds more useful, IMO.  I don't want to mess up my strings
> > just to have pretty source code
> 
> Filling strings in code would be useful, but isn't that a separate,
> don't-break-my-strings feature?

Not necessarily.  I frequently fill stuff in my code, and don't want
to use a separate command if the region I fill includes strings (or
comments, or something other that needs special filling behavior).

> Historically, the point of text justification is to make text fit on a
> screen.  For example, the documentation for fill-region refers to
> columns, which are features of buffers:
> 
>     Column beyond which automatic line-wrapping should happen.
> 
> Auto-fill-mode is consistent:
> 
>     inserting a space at a column beyond current-fill-column
>     automatically breaks the line
> 
> In a grand sweep, the manual explains what needs to fit where:
> 
>     “Filling” text means breaking it up into lines that fit a specified
>     width.
> 
> Section 26.6.2 ("Explicit Fill Commands") is even more, well, explicit:
> 
>     The command ‘M-q’ (‘fill-paragraph’) “fills” the current paragraph.
>     It redistributes the line breaks within the paragraph, and deletes
>     any excess space and tab characters occurring within the paragraph,
>     in such a way that the lines end up fitting within a certain maximum
>     width.
> 
> How text shows on a screen is clearly a central feature.  The manual
> continues:
> 
>     The maximum line width for filling is specified by the buffer-local
>     variable ‘fill-column’.  The default value (*note Locals::) is 70.
>     The easiest way to set ‘fill-column’ in the current buffer is to use
>     the command ‘C-x f’ (‘set-fill-column’).  [...]  Note that, by its
>     very nature, ‘fill-column’ is measured in column units; the actual
>     position of that column on a graphical display depends on the font
>     being used.  In particular, using variable-pitch fonts will cause
>     the ‘fill-column’ occupy different horizontal positions on display
>     in different lines.
> 
> In my view, the string interpretation calls for a different, though
> related feature.

You are quoting text which talks about the _default_ filling.  The
default filling is tailored to "uniform" text, i.e. really to Text
mode and its descendants.

However, Emacs lets major modes customize filling as appropriate for
the mode, by defining mode-specific filling functions.  Which is what
happens in this case: lisp-mode.el defines a fill-paragraph function
that is specific to Lisp modes.  It is completely legitimate for such
mode-specific functions to special-case strings inside code and do
something special about that.

So I don't see how what we do now is against the spirit of filling.

(Btw, I think it's high time we closed that bug, since Emacs 28.2 was
released long ago.)

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Maxim Cournoyer]

Hello,

Eli Zaretskii <eliz@gnu.org> writes:

[...]

>> Filling strings in code would be useful, but isn't that a separate,
>> don't-break-my-strings feature?
>
> Not necessarily.  I frequently fill stuff in my code, and don't want
> to use a separate command if the region I fill includes strings (or
> comments, or something other that needs special filling behavior).

I agree that having a single way to 'fill text/code/whatever' is nice.

[...]

> You are quoting text which talks about the _default_ filling.  The
> default filling is tailored to "uniform" text, i.e. really to Text
> mode and its descendants.
>
> However, Emacs lets major modes customize filling as appropriate for
> the mode, by defining mode-specific filling functions.  Which is what
> happens in this case: lisp-mode.el defines a fill-paragraph function
> that is specific to Lisp modes.  It is completely legitimate for such
> mode-specific functions to special-case strings inside code and do
> something special about that.
>
> So I don't see how what we do now is against the spirit of filling.

Maybe it doesn't in general, but in the case of Guix packages, it's
strikingly odd compared to the past behavior which was respecting the
fill-column in a long multi-line string (refer to the original issue I
had detailed in this thread for an example).

> (Btw, I think it's high time we closed that bug, since Emacs 28.2 was
> released long ago.)

It's a change of behavior introduced in version 28 that apparently
doesn't make unanimity (though perhaps noticed mostly by Guix
developers, where the use of the multi-line strings for package
descriptions makes this issue very visible and annoying); the GNU Guix
project has been carrying this in its .dir-locals.el file, which simply
reverts to the old behavior before commit 9bf367e1848:

--8<---------------cut here---------------start------------->8---
   ;; Emacs 28 changed the behavior of 'lisp-fill-paragraph', which causes the
   ;; first line of package descriptions to extrude past 'fill-column', and
   ;; somehow that is deemed more correct upstream (see:
   ;; https://issues.guix.gnu.org/56197).
   (eval . (progn
             (require 'lisp-mode)
             (defun emacs27-lisp-fill-paragraph (&optional justify)
               (interactive "P")
               (or (fill-comment-paragraph justify)
                   (let ((paragraph-start
                          (concat paragraph-start
                                  "\\|\\s-*\\([(;\"]\\|\\s-:\\|`(\\|#'(\\)"))
                         (paragraph-separate
                          (concat paragraph-separate "\\|\\s-*\".*[,\\.]$"))
                         (fill-column (if (and (integerp emacs-lisp-docstring-fill-column)
                                               (derived-mode-p 'emacs-lisp-mode))
                                          emacs-lisp-docstring-fill-column
                                        fill-column)))
                     (fill-paragraph justify))
                   ;; Never return nil.
                   t))
             (setq-local fill-paragraph-function #'emacs27-lisp-fill-paragraph)))
--8<---------------cut here---------------end--------------->8---

I can't say it feels very satisfactory; a switch like one imagined by
Felix could be a step in the right direction; it'd be at least more
concise in the project .dir-locals.  Would a patch implementing that be
welcome?

Happy New Year,

-- 
Maxim

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Eli Zaretskii]

> From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
> Cc: Felix Lechner <felix.lechner@lease-up.com>,  56197@debbugs.gnu.org,
>   stefankangas@gmail.com,  larsi@gnus.org
> Date: Sat, 28 Dec 2024 14:26:32 +0900
> 
> I can't say it feels very satisfactory; a switch like one imagined by
> Felix could be a step in the right direction; it'd be at least more
> concise in the project .dir-locals.  Would a patch implementing that be
> welcome?

I don't see how a user option to control this could be useful, since
the preferred behavior is not only buffer-local, but also specific to
certain syntactic constructs.  But I won't object to having such an
option.

I also don't see what's wrong with the solution of having a special
function in .dir-locals.el.  We don't pretend that the default Emacs
behavior should necessarily fit all the use cases, and provide ample
opportunities for customizing Emacs behavior for that reason.
Defining a custom fill-paragraph function is a perfectly valid
solution, not very different from having a user option for the same
purpose.  So I'm not sure I understand why you prefer adding an
option, when the Guix project has already solved the problem in a
perfectly legitimate and clean way.

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Maxim Cournoyer]

Hello,

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
>> Cc: Felix Lechner <felix.lechner@lease-up.com>,  56197@debbugs.gnu.org,
>>   stefankangas@gmail.com,  larsi@gnus.org
>> Date: Sat, 28 Dec 2024 14:26:32 +0900
>>
>> I can't say it feels very satisfactory; a switch like one imagined by
>> Felix could be a step in the right direction; it'd be at least more
>> concise in the project .dir-locals.  Would a patch implementing that be
>> welcome?
>
> I don't see how a user option to control this could be useful, since
> the preferred behavior is not only buffer-local, but also specific to
> certain syntactic constructs.  But I won't object to having such an
> option.

Having the behavior defined per-project or even globally (reverting to
the the pre-Emacs 28 behavior) via a simple option seems like it'd
simplify things, and make them discoverable.

> I also don't see what's wrong with the solution of having a special
> function in .dir-locals.el.  We don't pretend that the default Emacs
> behavior should necessarily fit all the use cases, and provide ample
> opportunities for customizing Emacs behavior for that reason.
> Defining a custom fill-paragraph function is a perfectly valid
> solution, not very different from having a user option for the same
> purpose.  So I'm not sure I understand why you prefer adding an
> option, when the Guix project has already solved the problem in a
> perfectly legitimate and clean way.

For one, having to put that largish piece of evaluated code in the
.dir-locals.el of the project means each new developer is prompted to
trust it, and it makes it more intimidating/pollutes their user conf
file (being added to the 'safe-local-variable-values' value).

It's also not discoverable; a customizable option would help in this
regard.

-- 
Thanks,
Maxim

bug#56197: 28.1; lisp-fill-paragraph result regressed with Emacs 28

[Maxim Cournoyer]

Hello,

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>
>> ;; Emacs 28
>>     (description "IBus-Anthy is an engine for the input bus \"IBus\").  It adds the Anthy
>> Japanese language input method to IBus.  Because most graphical applications
>> allow text input via IBus, installing this package will enable Japanese
>> language input in most graphical applications.")
>
> [...]
>
>> Simply commenting out the newly added block, evaluating the defun and
>> running it on my example reverts to the previous correct behavior.
>
> I'm not sure the previous behaviour was any more correct.  It's now
> filling that string as if it, well, is a string, so that if you insert
> it somewhere, the lines have similar lengths.  The previous behaviour
> was to fill "what you see in the buffer", which is wrong in most
> contexts.
>
> So I don't know.  Anybody have an opinion?

Apologies if my previous example lacked too much context and confused
more than helped.  Here's another example, where I just experienced the
problem after revamping the GNU Guix 'font-abattis-cantarrel' package
definition:

--8<---------------cut here---------------start------------->8---
(define-public font-abattis-cantarell
  (package
    (name "font-abattis-cantarell")
    (version "0.303")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://gitlab.gnome.org/GNOME/cantarell-fonts")
             (commit (string-append "v" version))))
       (file-name (git-file-name name version))
       (sha256
        (base32
         "1d1ay0fdqchk0wa5yqxis2c98imvzsbbd2kjv0x8sk4fm419847b"))))
    (build-system meson-build-system)
    (arguments
     (list #:configure-flags #~(list "-Dbuildstatics=true")))
    (native-inputs
     (list gettext-minimal
           psautohint
           python
           python-cffsubr
           python-fontmath
           python-statmake
           python-ufo2ft))
    (home-page "https://wiki.gnome.org/Projects/CantarellFonts")
    (synopsis "Cantarell sans-serif typeface")
    (description "The Cantarell font family is a contemporary Humanist sans-serif designed for
on-screen reading.  It is used by GNOME@tie{}3.  This package contains both
the non-variable as well as the variable versions of the font.")
    (license license:silofl1.1)))
--8<---------------cut here---------------end--------------->8---
    
This is a Scheme sexp extracted from the (gnu packages fonts) Guile
module.  Hitting `lisp-fill-paragraph' (M-q) causes the above
indentation, where the first line of the description extends past the
`fill-column' value.

I hope that helps,

Thanks!

Maxim