GNU bug report logs - #2889
ibuffer: sorting by KEY + secondary key (buffer name)

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Jari Aalto <jari.aalto <at> cante.net>
To: Emacs bug BTS <submit <at> debbugs.gnu.org>
Subject: ibuffer: sorting by KEY + secondary key (buffer name)
Date: Sat, 04 Apr 2009 19:07:58 +0300

Severity: wishlist


M-x ibuffer
C-h m

Sorting commands:

  ',' - Rotate between the various sorting modes.
  's i' - Reverse the current sorting order.
  's a' - Sort the buffers lexicographically.
  's f' - Sort the buffers by the file name.
  's v' - Sort the buffers by last viewing time.
  's s' - Sort the buffers by size.
  's m' - Sort the buffers by major mode.

SUGGESTION

The commands currently sort by the KEY only.

But it would be helpful if the sorting were done by secondary KEY too;
the buffer name.

Instead of current behavior:

  s m

				 Current Key
  ...                            |
  % emacs-lisp-my-s...       428 Dired by name
  % exam                    1699 Dired by name
  % all                     2524 Dired by name
  % new                      404 Dired by name
  % examples                 929 Dired by name
  % string                   292 Dired by name
  % fstream                  224 Dired by name
  % other                   2908 Dired by name
  % class                    470 Dired by name
  % argv                     281 Dired by name
  % struct                   223 Dired by name
  ..

The sencondary key would be used to determine the order. The result
being:

    Secondary key
    |
  % all                     2524 Dired by name
  % argv                     281 Dired by name
  % class                    470 Dired by name
  % emacs-lisp-my-s...       428 Dired by name
  % exam                    1699 Dired by name
  % examples                 929 Dired by name
  % fstream                  224 Dired by name
  % new                      404 Dired by name
  % other                   2908 Dired by name
  % string                   292 Dired by name
  % struct                   223 Dired by name

Message #8 received at 2889 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Jari Aalto <jari.aalto <at> cante.net>
Cc: 2889 <at> debbugs.gnu.org
Subject: Re: bug#2889: ibuffer: sorting by KEY + secondary key (buffer name)
Date: Mon, 30 Sep 2019 10:09:44 +0200

Jari Aalto <jari.aalto <at> cante.net> writes:

> M-x ibuffer
> C-h m
>
> Sorting commands:
>
>   ',' - Rotate between the various sorting modes.
>   's i' - Reverse the current sorting order.
>   's a' - Sort the buffers lexicographically.
>   's f' - Sort the buffers by the file name.
>   's v' - Sort the buffers by last viewing time.
>   's s' - Sort the buffers by size.
>   's m' - Sort the buffers by major mode.
>
> SUGGESTION
>
> The commands currently sort by the KEY only.
>
> But it would be helpful if the sorting were done by secondary KEY too;
> the buffer name.

(I'm going through old bug reports that unfortunately didn't get any
response at the time.)

I think that would be surprising behaviour.  Currently the sorting
commands are "stable": That is, if you first reverse-sort by buffer
name, and then by size, all the buffers with identical size are then
reversed-sort by buffer name.

The proposed change would make that feature go missing, so I don't think
this would be a good change, and I'm closing this bug report.

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

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