GNU bug report logs - #54128
27.2; c-paragraph-* variables not sufficiently documented

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

From: John Hagerman <John.Hagerman <at> synopsys.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 27.2; c-paragraph-* variables not sufficiently documented
Date: Wed, 23 Feb 2022 16:01:59 +0000

[Sent manually because sending from Emacs didn't work.]


Save this as file "comment.c" (*.c as C-mode is important):
---8<---
// \details
// I want the previous line to be untouched by c-fill-paragraph.
--->8---

Dribble file:
comment.c<return><escape>q<escape>:(setq c-paragraph-separate "$\\|// \\\\[a-z]+$")<return><escape>:(c-setup-paragraph-variables)<return><escape>q

Summary of actions:
+ Read comment.c; C-mode is entered.
+ Move down one line and do c-fill-paragraph: the two lines are merged
+ Undo to revert to original two lines
+ Set c-paragraph-separate and update the C-mode variables
+ Do c-fill-paragraph again; this time the two lines are not merged

There is nothing wrong with these actions!  The bug is only about the
c-paragraph-* variable documentation.

The Bug:
The documentation for c-paragraph-separate and c-paragraph-start should
describe the fact that they must begin with "$\\|" to work properly.

Details:
// Upon entering C-mode, the value of c-paragraph-separate is "$".
//
// \details
// I want the previous line to be untouched by c-fill-paragraph.
// With c-paragraph-separate being "$", that line will be included
// in a paragraph fill.  So: I want lines matching "^// \\\\[a-z]+$"
// to stand alone.  I will modify c-paragraph-separate to get this.
//
// As always, fill-paragraph regexps do not start with "^".  After a
// fair amount of work I found that custom c-paragraph-separate (and
// c-paragraph-start) must begin with "$\\|" to work properly.  So I
// do this:
// (setq c-paragraph-separate "$\\|// \\\\[a-z]+$")
// (c-setup-paragraph-variables)
//
// This bug report is about the fact that c-paragraph-separate and
// c-paragraph-start must begin with "$\\|".  Ideally that would be
// fixed.  But at the least this fact should be described in the
// variables' documentation.


In GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.12)
 of 2021-06-11 built on depbldcs73
Windowing system distributor 'TigerVNC', version 11.0.11400000
System Description: CentOS Linux 7 (Core)

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

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Message #8 received at 54128 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: John Hagerman <John.Hagerman <at> synopsys.com>
Cc: 54128 <at> debbugs.gnu.org, Alan Mackenzie <acm <at> muc.de>
Subject: Re: bug#54128: 27.2; c-paragraph-* variables not sufficiently
 documented
Date: Wed, 23 Feb 2022 21:04:19 +0100

John Hagerman <John.Hagerman <at> synopsys.com> writes:

> The Bug:
> The documentation for c-paragraph-separate and c-paragraph-start should
> describe the fact that they must begin with "$\\|" to work properly.

Alan added to the CCs; perhaps he has some comments.

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

Message #11 received at 54128 <at> debbugs.gnu.org (full text, mbox):

From: Alan Mackenzie <acm <at> muc.de>
To: John Hagerman <John.Hagerman <at> synopsys.com>,
 Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 54128 <at> debbugs.gnu.org, acm <at> muc.de
Subject: Re: bug#54128: 27.2; c-paragraph-* variables not sufficiently
 documented
Date: Sat, 26 Feb 2022 16:59:45 +0000

Hello, John and Lars.

On Wed, Feb 23, 2022 at 16:01:59 +0000, John Hagerman wrote:
> [Sent manually because sending from Emacs didn't work.]


> Save this as file "comment.c" (*.c as C-mode is important):
> ---8<---
> // \details
> // I want the previous line to be untouched by c-fill-paragraph.
> --->8---

> Dribble file:
> comment.c<return><escape>q<escape>:(setq c-paragraph-separate "$\\|// \\\\[a-z]+$")<return><escape>:(c-setup-paragraph-variables)<return><escape>q

> Summary of actions:
> + Read comment.c; C-mode is entered.
> + Move down one line and do c-fill-paragraph: the two lines are merged
> + Undo to revert to original two lines
> + Set c-paragraph-separate and update the C-mode variables
> + Do c-fill-paragraph again; this time the two lines are not merged

> There is nothing wrong with these actions!  The bug is only about the
> c-paragraph-* variable documentation.

> The Bug:
> The documentation for c-paragraph-separate and c-paragraph-start should
> describe the fact that they must begin with "$\\|" to work properly.

Forgive me, it is nearly 20 years since I constructed these variables;
why is the "$\\|" necessary?  What happened when you tried to construct
a regular expression without it?

> Details:
> // Upon entering C-mode, the value of c-paragraph-separate is "$".
> //
> // \details
> // I want the previous line to be untouched by c-fill-paragraph.
> // With c-paragraph-separate being "$", that line will be included
> // in a paragraph fill.  So: I want lines matching "^// \\\\[a-z]+$"
> // to stand alone.  I will modify c-paragraph-separate to get this.
> //
> // As always, fill-paragraph regexps do not start with "^".  After a
> // fair amount of work I found that custom c-paragraph-separate (and
> // c-paragraph-start) must begin with "$\\|" to work properly.  So I
> // do this:
> // (setq c-paragraph-separate "$\\|// \\\\[a-z]+$")
> // (c-setup-paragraph-variables)
> //
> // This bug report is about the fact that c-paragraph-separate and
> // c-paragraph-start must begin with "$\\|".  Ideally that would be
> // fixed.  But at the least this fact should be described in the
> // variables' documentation.


> In GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.12)
>  of 2021-06-11 built on depbldcs73
> Windowing system distributor 'TigerVNC', version 11.0.11400000
> System Description: CentOS Linux 7 (Core)

-- 
Alan Mackenzie (Nuremberg, Germany).

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