GNU bug report logs - #21921
New function comment-line also comments first line after region

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 21921 in the body.
You can then email your comments to 21921 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

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

From: Clément Pit--Claudel <clement.pitclaudel <at> live.com>
To: bug-gnu-emacs <at> gnu.org
Subject: New function comment-line also comments first line after region
Date: Sat, 14 Nov 2015 13:24:23 -0500

[Message part 1 (text/plain, inline)]

Hi all,

The new comment-line feature is very convenient, but I find its operation slightly confusing wrt the "comment out region" feature.

Its documentation says:

  If region is active, comment lines in active region instead.

However, it seems that it also comments out the line just after the end
of the region.

For example, given the following text

abc
def
ghi

Placing the cursor before `a', then pressing C-SPC C-n C-n, causes two
lines to be marked: (> is highlighting, | is point)

>abc
>def
|ghi

Yet pressing C-x C-; (comment-region) comments out all three lines.

Similarly, again starting from 

abc
def
ghi

placing the point before `g' and pressing C-SPC C-p C-p causes two lines
to be marked:

>|abc
>def
ghi

Yet pressing C-x C-; comments out all three lines. I find this second example especially confusing.

Is this behaviour only surprising to me?

Cheers,
Clément.

In GNU Emacs 25.1.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2015-11-14
Repository revision: 02bf89f857e04b8023ce03eadcfa87c82918e957
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Linux Mint 17.2 Rafaela

Configured using:
 'configure --with-x-toolkit=gtk3'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_TIME: en_DK.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-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
  transient-mark-mode: t

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

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message dired format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr
mail-utils time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 80441 7581)
 (symbols 48 19255 0)
 (miscs 40 38 110)
 (strings 32 12779 4612)
 (string-bytes 1 365820)
 (vectors 16 10757)
 (vector-slots 8 419611 2876)
 (floats 8 143 70)
 (intervals 56 194 0)
 (buffers 976 11)
 (heap 1024 25940 1037))

[signature.asc (application/pgp-signature, attachment)]

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

From: Rasmus <rasmus <at> gmx.us>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#21921: New function comment-line also comments first line
 after region
Date: Sun, 15 Nov 2015 12:45:02 +0100

Hi Clément,

Thanks for details report.

Clément Pit--Claudel <clement.pitclaudel <at> live.com> writes:

> Its documentation says:
>
>   If region is active, comment lines in active region instead.
>
> However, it seems that it also comments out the line just after the end
> of the region.
>
> For example, given the following text
>
> abc
> def
> ghi
>
> Placing the cursor before `a', then pressing C-SPC C-n C-n, causes two
> lines to be marked: (> is highlighting, | is point)
>
>>abc
>>def
> |ghi
>
> Yet pressing C-x C-; (comment-region) comments out all three lines.

Because the end of region is at point.  Try to run this:

        (list (point)  (region-beginning) (region-end))

Also, from the docstring,

      Unlike ‘comment-dwim’, this always comments whole lines.

You'd get what you'd expect if you run comment-dwim (M-;)

> Similarly, again starting from 
>
> abc
> def
> ghi
>
> placing the point before `g' and pressing C-SPC C-p C-p causes two lines
> to be marked:

Again, in fact the region start at 'g'.  Check e.g. with C-x C-x.  But
it's not obvious from the face.

>>|abc
>>def
> ghi
>
> Yet pressing C-x C-; comments out all three lines. I find this second example especially confusing.
>
> Is this behaviour only surprising to me?

Perhaps the confusion is caused by region not being displayed at column
zero.

The behavior is correct IMO.

For your particular examples, comment-dwim does what you want, it seems.

Hope it helps,
Rasmus

-- 
Spil noget med Slayer!

Message #11 received at 21921 <at> debbugs.gnu.org (full text, mbox):

From: Artur Malabarba <bruce.connor.am <at> gmail.com>
To: Rasmus <rasmus <at> gmx.us>
Cc: 21921 <at> debbugs.gnu.org
Subject: Re: bug#21921: New function comment-line also comments first line
 after region
Date: Mon, 16 Nov 2015 09:02:12 +0000

[Message part 1 (text/plain, inline)]

On 15 Nov 2015 11:45 am, "Rasmus" <rasmus <at> gmx.us> wrote:
> >
> > Yet pressing C-x C-; comments out all three lines. I find this second
example especially confusing.
> >
> > Is this behaviour only surprising to me?
>
> Perhaps the confusion is caused by region not being displayed at column
> zero.
>
> The behavior is correct IMO.
>
> For your particular examples, comment-dwim does what you want, it seems.
>
> Hope it helps,
> Rasmus

Indeed. When I was deciding how comment-line should work on a region, I
specifically chose to not make it identical to comment-dwim.

Maybe it should still treat the "region ends at a newline" case specially.
Some emacs commands do that already.
Not sure though, since that would be slightly redundant with comment-dwim.

[Message part 2 (text/html, inline)]

Message #14 received at 21921 <at> debbugs.gnu.org (full text, mbox):

From: Rasmus <rasmus <at> gmx.us>
To: bruce.connor.am <at> gmail.com
Cc: 21921 <at> debbugs.gnu.org
Subject: Re: bug#21921: New function comment-line also comments first line
 after region
Date: Mon, 16 Nov 2015 18:59:49 +0100

Artur Malabarba <bruce.connor.am <at> gmail.com> writes:

> Indeed. When I was deciding how comment-line should work on a region, I
> specifically chose to not make it identical to comment-dwim.
>
> Maybe it should still treat the "region ends at a newline" case specially.
> Some emacs commands do that already.
> Not sure though, since that would be slightly redundant with comment-dwim.

It's already in comment-dwim.  On my layout, comment-dwim is easier to
reach anyway.  I’m indifferent on the behavior of comment-line in this
edge case.  Both would make sense.

Rasmus

-- 
This is the kind of tedious nonsense up with which I will not put

Message #17 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andreas Röhler <andreas.roehler <at> easy-emacs.de>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#21921: New function comment-line also comments first line
 after	region
Date: Tue, 17 Nov 2015 21:47:51 +0100

 On 16.11.2015 18:59, Rasmus wrote:
> Artur Malabarba<bruce.connor.am <at> gmail.com>  writes:
>
>> Indeed. When I was deciding how comment-line should work on a region, I
>> specifically chose to not make it identical to comment-dwim.
>>
>> Maybe it should still treat the "region ends at a newline" case specially.
>> Some emacs commands do that already.
>> Not sure though, since that would be slightly redundant with comment-dwim.
> It's already in comment-dwim.  On my layout, comment-dwim is easier to
> reach anyway.  I’m indifferent on the behavior of comment-line in this
> edge case.  Both would make sense.
>
> Rasmus
>

Being in favor to keep it as implemented. Congrats BTW. Use this feature 
for years personally, glad to see it built-in now.
IMO it's most useful as line-oriented command. Moving one line down, 
being ready for repeat.

Cheers,

Andreas

Message #20 received at 21921 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: 21921 <at> debbugs.gnu.org
Subject: Re: bug#21921: New function comment-line also comments first line
 after region
Date: Sun, 04 Jun 2017 09:24:42 -0400

tags 21921 notabug wontfix
close 21921
quit

Rasmus <rasmus <at> gmx.us> writes:

> Perhaps the confusion is caused by region not being displayed at column
> zero.
>
> The behavior is correct IMO.
>

Artur Malabarba <bruce.connor.am <at> gmail.com> writes:

> Indeed. When I was deciding how comment-line should work on a region, I specifically chose to not make it identical to comment-dwim. 
>
> Maybe it should still treat the "region ends at a newline" case specially. Some emacs commands do that already.
> Not sure though, since that would be slightly redundant with comment-dwim. 

Andreas Röhler <andreas.roehler <at> easy-emacs.de> writes:

> Being in favor to keep it as implemented. Congrats BTW. Use this
> feature for years personally, glad to see it built-in now.
> IMO it's most useful as line-oriented command. Moving one line down,
> being ready for repeat.


I think we've decided it's okay as is, closing.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.