GNU logs - #50840, boring messages


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It sounds like none of the comment styles in 'comment-styles' can
produce the style of C code comments that we use in Emacs, i.e.

    /* This is the first line of a multi-line comment.
       This is the final line of a multi-line comment.  */

And I don't see anything in the CC Mode manual to augment that,
either.

Is this true?  If so, a feature request: add a style to support that.
If such a style already exists, please clarify the documentation so that
users could understand which style does that.

And one more nit: Can the 'comment-end' inserted after the end of a
comment please keep _two_ spaces after the period that ends the last
line of a comment?  Or at least heed the setting of
'sentence-end-double-space'?

Thanks.

In GNU Emacs 28.0.50 (build 1891, i686-pc-mingw32)
 of 2021-09-27 built on HOME-C4E4A596F7
Repository revision: d45b3e03c96813e10f8de3c375a5310c01623dab
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 5.1.2600
System Description: Microsoft Windows XP Service Pack 3 (v5.1.0.2600)

Configured using:
 'configure -C --prefix=/d/usr --with-wide-int --with-modules
 --enable-checking=yes,glyphs 'CFLAGS=-O0 -gdwarf-4 -g3''

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY
W32NOTIFY PDUMPER PNG RSVG SOUND THREADS TIFF TOOLKIT_SCROLL_BARS XPM
ZLIB

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1255

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-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
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote threads w32notify w32 lcms2 multi-tty
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Memory information:
((conses 16 56764 6239)
 (symbols 48 7798 1)
 (strings 16 21663 2718)
 (string-bytes 1 633064)
 (vectors 16 13627)
 (vector-slots 8 179704 10721)
 (floats 8 23 53)
 (intervals 40 265 116)
 (buffers 888 10))




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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Eli Zaretskii <eliz@HIDDEN>
Subject: bug#50840: Acknowledgement (28.0.50; Support GNU style of
 multiline comments in C source code)
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severity 50840 wishlist
quit




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Hello, Eli.

On Mon, Sep 27, 2021 at 10:56:17 +0300, Eli Zaretskii wrote:

> It sounds like none of the comment styles in 'comment-styles' can
> produce the style of C code comments that we use in Emacs, i.e.

>     /* This is the first line of a multi-line comment.
>        This is the final line of a multi-line comment.  */

> And I don't see anything in the CC Mode manual to augment that,
> either.

On pressing M-; in gnu style in C Mode, you get

    /*  */

, with two spaces between the asterisks.

With an existing comment, and point in the middle of the comment:

   /* foobar barfoo */
            ^
	  point

, on pressing CR, you get

  /* foobar
     barfoo */

If auto-fill-mode is enabled, and one types past fill-column, the new
comment line produced by auto-fill is indented to the desired column.

Thus far, this produces Emacs style C comments.

#########################################################################

However, if point is at the end of the first line of a comment and CR is
pressed:

   /* foobar foobar foobar foobar */
                                 ^
			       point

,  you get

   /* foobar foobar foobar foobar
   */
   ^
 point

..  This seems reasonable for a commenting style that ends with */ alone
on the last line.  But it is inconvenient for the second/subsequent line
of an Emacs style comment.  Is this what you mean by "none of the
comment styles ... produce the ... comments that we use in Emacs"?

If so, we could enhance auto-fill-mode to refill when a space is typed
immediately before a comment closer.  But that somehow doesn't feel
quite right.

Ideally, we want some sort of electric indentation immediately on typing
any character before a comment closer alone on a line:

  /* foobar
  */
  ^
point

, on typing an f should go to

  /* foobar
     f*/

, or possibly even to

  /* foobar
     f */

..  I would be in favour of implementing this as a new feature, but
strictly restricted to the exact scenario above, namely:
(i) point is directly at the comment closer.
(ii) point is in the same column as the comment opener above.
This should minimise irritation to people typing in spaces to draw
pictures in comments, e.g. with |, \, -, /, and suchlike.

This should probably be coded inside lisp/newcomment.el, somehow.  Maybe
we could introduce a new component into the elements of comment-styles
meaning "re-indent bare comment-ender line on typing a self-insert
character".


> Is this true?  If so, a feature request: add a style to support that.
> If such a style already exists, please clarify the documentation so that
> users could understand which style does that.

> And one more nit: Can the 'comment-end' inserted after the end of a
> comment please keep _two_ spaces after the period that ends the last
> line of a comment?  Or at least heed the setting of
> 'sentence-end-double-space'?

Are we talking about C-c C-c (aka M-x comment-region) here?  This
command currently inserts comment-end (in C Mode, " */") at the end of
each line being commented, which will leave a single space between what
was the last "." on the line and the "*/".

We could surely check for an end of sentence character at EOL here, and
if we've got one, check that at least two spaces are left.  This again
would be something for lisp/newcomment.el.

> Thanks.

> In GNU Emacs 28.0.50 (build 1891, i686-pc-mingw32)
>  of 2021-09-27 built on HOME-C4E4A596F7
> Repository revision: d45b3e03c96813e10f8de3c375a5310c01623dab
> Repository branch: master
> Windowing system distributor 'Microsoft Corp.', version 5.1.2600
> System Description: Microsoft Windows XP Service Pack 3 (v5.1.0.2600)

> Configured using:
>  'configure -C --prefix=/d/usr --with-wide-int --with-modules
>  --enable-checking=yes,glyphs 'CFLAGS=-O0 -gdwarf-4 -g3''

> Configured features:
> ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY
> W32NOTIFY PDUMPER PNG RSVG SOUND THREADS TIFF TOOLKIT_SCROLL_BARS XPM
> ZLIB

[ .... ]

-- 
Alan Mackenzie (Nuremberg, Germany).




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> Date: Mon, 27 Sep 2021 18:35:50 +0000
> Cc: 50840 <at> debbugs.gnu.org, Stefan Monnier <monnier@HIDDEN>,
>   acm@HIDDEN
> From: Alan Mackenzie <acm@HIDDEN>
> 
> > Is this true?  If so, a feature request: add a style to support that.
> > If such a style already exists, please clarify the documentation so that
> > users could understand which style does that.
> 
> > And one more nit: Can the 'comment-end' inserted after the end of a
> > comment please keep _two_ spaces after the period that ends the last
> > line of a comment?  Or at least heed the setting of
> > 'sentence-end-double-space'?
> 
> Are we talking about C-c C-c (aka M-x comment-region) here?

Yes, my use case, and the context in which I filed the bug report, was
"C-c C-c".  Not only for the 2 spaces issue, but also for the comment
style.

> This command currently inserts comment-end (in C Mode, " */") at the
> end of each line being commented, which will leave a single space
> between what was the last "." on the line and the "*/".
> 
> We could surely check for an end of sentence character at EOL here, and
> if we've got one, check that at least two spaces are left.  This again
> would be something for lisp/newcomment.el.

Probably.  That''s why Stefan was CC'ed as well.




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Hello, Eli.

On Mon, Sep 27, 2021 at 21:51:45 +0300, Eli Zaretskii wrote:
> > Date: Mon, 27 Sep 2021 18:35:50 +0000
> > Cc: 50840 <at> debbugs.gnu.org, Stefan Monnier <monnier@HIDDEN>,
> >   acm@HIDDEN
> > From: Alan Mackenzie <acm@HIDDEN>

> > > Is this true?  If so, a feature request: add a style to support that.
> > > If such a style already exists, please clarify the documentation so that
> > > users could understand which style does that.

> > > And one more nit: Can the 'comment-end' inserted after the end of a
> > > comment please keep _two_ spaces after the period that ends the last
> > > line of a comment?  Or at least heed the setting of
> > > 'sentence-end-double-space'?

> > Are we talking about C-c C-c (aka M-x comment-region) here?

> Yes, my use case, and the context in which I filed the bug report, was
> "C-c C-c".  Not only for the 2 spaces issue, but also for the comment
> style.

> > This command currently inserts comment-end (in C Mode, " */") at the
> > end of each line being commented, which will leave a single space
> > between what was the last "." on the line and the "*/".

> > We could surely check for an end of sentence character at EOL here, and
> > if we've got one, check that at least two spaces are left.  This again
> > would be something for lisp/newcomment.el.

> Probably.  That''s why Stefan was CC'ed as well.

OK.  Here's a provisional patch to lisp/newcomment.el that tries to fix
the two spaces at the end of a sentence issue.  I haven't got anywhere
with the main bug, yet.



diff --git a/lisp/newcomment.el b/lisp/newcomment.el
index b458f0356d..8865613383 100644
--- a/lisp/newcomment.el
+++ b/lisp/newcomment.el
@@ -1162,7 +1162,8 @@ comment-region-internal
       (unless (or ce-sanitized (eolp)) (insert "\n") (indent-according-to-mode))
       (comment-with-narrowing beg end
 	(let ((min-indent (point-max))
-	      (max-indent 0))
+	      (max-indent 0)
+              ceeee extra-spaces eos-col)
 	  (goto-char (point-min))
 	  ;; Quote any nested comment marker
 	  (comment-quote-nested comment-start comment-end nil)
@@ -1174,6 +1175,25 @@ comment-region-internal
 		(unless (looking-at "[ \t]*$")
 		  (setq min-indent (min min-indent (current-indentation))))
 		(end-of-line)
+                ;; Do we need extra spaces at an end of sentence?
+                (setq ceeee (if (eobp) ce cce))
+                (setq extra-spaces
+                      (and ceeee
+                           (save-excursion
+                             (skip-chars-backward "  \t")
+                             (setq eos-col (current-column))
+                             (or (bolp) (backward-char))
+                             (looking-at (sentence-end)))
+                           (max (- (if sentence-end-double-space 2 1)
+                                   (- (current-column) eos-col)
+                                   (if ceeee
+                                       (progn
+                                         (string-match "^[  \t]*" ceeee)
+                                         (match-end 0)) ; # spaces in ce/cce.
+                                     0))
+                                0)))
+                (when (and extra-spaces (> extra-spaces 0))
+                  (move-to-column (+ (current-column) extra-spaces) t))
 		(setq max-indent (max max-indent (current-column)))
 		(not (or (eobp) (progn (forward-line) nil)))))
 

-- 
Alan Mackenzie (Nuremberg, Germany).




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> OK.  Here's a provisional patch to lisp/newcomment.el that tries to fix
> the two spaces at the end of a sentence issue.  I haven't got anywhere
> with the main bug, yet.

Thanks, Alan.  This looks good.
Only one request: could you put the bulk of the new code into a separate function?
I'll see about the "main bug" ASAP,


        Stefan





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Hello, Stefan.

On Wed, Sep 29, 2021 at 08:08:43 -0400, Stefan Monnier wrote:
> > OK.  Here's a provisional patch to lisp/newcomment.el that tries to fix
> > the two spaces at the end of a sentence issue.  I haven't got anywhere
> > with the main bug, yet.

> Thanks, Alan.  This looks good.
> Only one request: could you put the bulk of the new code into a separate function?
> I'll see about the "main bug" ASAP,

How about the patch below?  It's not perfect - the move-to-column might
insert a tab at EOL, which will then be the Wrong Thing after the
function inserts the comment opener at the left margin.  Or something
like that.  Maybe we should bind indent-tabs-mode to nil around  the
move-to-column.

I'll leave the "main bug" to you, then.



diff --git a/lisp/newcomment.el b/lisp/newcomment.el
index b458f0356d..5e8691890d 100644
--- a/lisp/newcomment.el
+++ b/lisp/newcomment.el
@@ -1124,6 +1124,27 @@ comment-add
       (* comment-add 1)
     (1- (prefix-numeric-value arg))))
 
+(defun comment--sentence-spaces (c-end)
+  "Add spaces at EOL in a comment if needed for an end of sentence.
+C-END, a string, is the comment ender for the current line.  When
+called, point must be at the end of the line, and will be left
+at the possibly changed EOL at the end of this function."
+  (let (extra-spaces eos-col)
+    (setq extra-spaces
+          (and (save-excursion
+                 (skip-chars-backward "  \t")
+                 (setq eos-col (current-column))
+                 (or (bolp) (backward-char))
+                 (looking-at (sentence-end)))
+               (max (- (if sentence-end-double-space 2 1)
+                       (- (current-column) eos-col)
+                       (progn
+                         (string-match "^[  \t]*" c-end)
+                         (match-end 0))) ; # spaces in ce/cce.
+                    0)))
+  (when (and extra-spaces (> extra-spaces 0))
+    (move-to-column (+ (current-column) extra-spaces) t))))
+
 (defun comment-region-internal (beg end cs ce
                                 &optional ccs cce block lines indent)
   "Comment region BEG .. END.
@@ -1174,6 +1195,8 @@ comment-region-internal
 		(unless (looking-at "[ \t]*$")
 		  (setq min-indent (min min-indent (current-indentation))))
 		(end-of-line)
+                (let ((c-end (if (eobp) ce cce)))
+                  (if c-end (comment--sentence-spaces c-end)))
 		(setq max-indent (max max-indent (current-column)))
 		(not (or (eobp) (progn (forward-line) nil)))))



>         Stefan

-- 
Alan Mackenzie (Nuremberg, Germany).





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