GNU bug report logs - #14531
24.3.50; `log-view-file-prev' doesn't move to the beginning of the log buffer

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

From: Xue Fuqiao <xfq.free <at> gmail.com>
To: bug-gnu-emacs <bug-gnu-emacs <at> gnu.org>
Subject: 24.3.50; `log-view-file-prev' doesn't move to the beginning of the
	log buffer
Date: Sun, 2 Jun 2013 10:53:34 +0800

In (info "(emacs) VC Change Log"):
  `P'
     Move to the log of the previous file, if showing logs for a
     multi-file VC fileset.  Otherwise, just move to the beginning of
     the log.  A numeric prefix argument is a repeat count.

I tried visiting a random Emacs Lisp file (calc.el) in the bzr repo, and
then execute `vc-print-log'.  It isn't a multi-file fileset, but
pressing `P' does not move to the beginning of the log buffer.  Instead,
an error message "No previous file" occurs.



In GNU Emacs 24.3.50.1 (x86_64-apple-darwin12.3.0, NS apple-appkit-1187.37)
 of 2013-06-01 on xfq.local
Bzr revision: 112804 eggert <at> cs.ucla.edu-20130601005434-8ksmtpg0tgseqsmf
Windowing system distributor `Apple', version 10.3.1187
Configured using:
 `configure --with-ns --enable-gtk-deprecation-warnings
 --enable-checking'

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  text-scale-mode: t
  which-function-mode: t
  electric-pair-mode: t
  delete-selection-mode: t
  auto-image-file-mode: t
  display-time-mode: t
  ido-everywhere: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  show-paren-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  savehist-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-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
  abbrev-mode: t

Recent input:
C-x b <return> C-x v l C-x 4 b <return> C-x r b <return>
C-x o SPC SPC SPC SPC M-v M-v M-v M-v SPC SPC SPC SPC
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC
M-< C-x o <down> <up> <down> <down> <down> C-x o p
p n n n p p C-x o <C-down> <C-down> C-l C-x o P n n
P P P C-h k P C-x o <tab> <return> <help-echo> <help-echo>
C-x k <return> <down-mouse-1> <mouse-1> C-x b <return>
C-x o n n n n n n n n n n n n n n P P P P P P P P P
P C-h k P <help-echo> <down-mouse-2> <mouse-1> M-<
C-v C-v C-v C-x C-x C-g C-v C-v C-v C-v C-v C-v C-v
C-v C-v C-v C-v C-x k <return> C-x b <return> C-x o
C-h k p C-x o <tab> <return> <right> C-h f <return>
<help-echo> <down-mouse-2> <mouse-1> M-< C-v C-x k
<return> C-x b <return> C-x b i n <return> <help-echo>
C-x b g m C-g C-x o C-x b i n C-g C-x C-f C-g C-x b
e m o <return> C-p C-p C-a <tab> C-n C-n C-a <C-return>
l o g - v i e w . e l C-x b <return> M-x r e - e m
- b u <tab> C-g M-! e m C-g M-! e m a c s SPC - Q C-g
C-x o C-n C-n M-x - <backspace> r e - e m - b u <tab>
<return> C-g C-x b C-g C-x 4 b v c <return> C-h k P
C-x o M-f M-f M-f M-f M-f M-b C-SPC M-f M-f M-f M-f
M-w C-x b <return> M-x r e - e m - b u <tab> <retu
rn>

Recent messages:
Type "q" in help window to restore its previous buffer.
mouse-2, RET: find function's definition
uncompressing log-view.el.gz...done

uncompressing easy-mmode.el.gz...done
Mark set
Quit [8 times]
Type "q" in help window to restore its previous buffer.
Mark set
delete-backward-char: Text is read-only

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help-fns elp info org-install hideshow midnight dired-x easymenu dired
bytecomp byte-compile cconv vc vc-dispatcher cl-lib package time-date
tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
register page menu-bar rfn-eshadow timer select scroll-bar mouse
jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
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overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process ns multi-tty
emacs)


--
Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/

Message #8 received at 14531 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Xue Fuqiao <xfq.free <at> gmail.com>
Cc: 14531 <at> debbugs.gnu.org
Subject: Re: bug#14531: 24.3.50;
	`log-view-file-prev' doesn't move to the beginning of the log buffer
Date: Mon, 03 Jun 2013 21:12:01 -0400

Xue Fuqiao wrote:

> I tried visiting a random Emacs Lisp file (calc.el) in the bzr repo, and
> then execute `vc-print-log'.  It isn't a multi-file fileset, but
> pressing `P' does not move to the beginning of the log buffer.  Instead,
> an error message "No previous file" occurs.

I think this is

http://debbugs.gnu.org/9409

Message #13 received at 14531 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Xue Fuqiao <xfq.free <at> gmail.com>
Cc: 9409 <at> debbugs.gnu.org, 14531 <at> debbugs.gnu.org
Subject: Re: bug#14531: 24.3.50; `log-view-file-prev' doesn't move to the
 beginning of the log buffer
Date: Fri, 25 Sep 2020 13:01:43 +0200

Xue Fuqiao <xfq.free <at> gmail.com> writes:

> In (info "(emacs) VC Change Log"):
>   `P'
>      Move to the log of the previous file, if showing logs for a
>      multi-file VC fileset.  Otherwise, just move to the beginning of
>      the log.  A numeric prefix argument is a repeat count.
>
> I tried visiting a random Emacs Lisp file (calc.el) in the bzr repo, and
> then execute `vc-print-log'.  It isn't a multi-file fileset, but
> pressing `P' does not move to the beginning of the log buffer.  Instead,
> an error message "No previous file" occurs.

I'm not sure what that command is meant to do, even after reading the
documentation and reading the code (and even reading the code doesn't
help that much, because these are easy-mmode-define-navigation
incantation).

It searches for the prev instance of:

log-view-file-re
"^\\(?:Working file: \\(?1:.+\\)\\|\\(?:SCCS/s\\.\\|Changes to \\)\\(?1:.+\\):\\)
"

in the *vc-change-log* buffer?  But ... there's nothing like that in a
git buffer?

So `P'/`N' always fails for me.  Is this just code that has bitrotted,
or is the use case just not...  explained well?

This bug was merged with:

Eduard Wiebe <usenet <at> pusto.de> writes:

> it bothers me that in some situation i cannot reach the head information
> of the `vc-print-log' via `log-view-msg-prev'.
>
> I fixed the issue by following simple patch.

[...]

> -                (error "No previous %s" ,name)))
> +                (goto-char (point-min))
> +		(error "No previous %s" ,name)))

I don't understand what's meant by "the head information", but the
`n'/`p' commands in *vc-change-log* buffers seems to work well for me?

Test case:

C-x C-f calc.el
C-x v l
n
p
p

So these seem to be different bugs and the second bug has been fixed in
the intervening years?

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

Message #16 received at 14531 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Xue Fuqiao <xfq.free <at> gmail.com>
Cc: 9409 <at> debbugs.gnu.org, Dmitry Gutov <dgutov <at> yandex.ru>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>, 14531 <at> debbugs.gnu.org
Subject: Re: bug#14531: 24.3.50; `log-view-file-prev' doesn't move to the
 beginning of the log buffer
Date: Thu, 05 May 2022 14:28:00 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

>> In (info "(emacs) VC Change Log"):
>>   `P'
>>      Move to the log of the previous file, if showing logs for a
>>      multi-file VC fileset.  Otherwise, just move to the beginning of
>>      the log.  A numeric prefix argument is a repeat count.
>>
>> I tried visiting a random Emacs Lisp file (calc.el) in the bzr repo, and
>> then execute `vc-print-log'.  It isn't a multi-file fileset, but
>> pressing `P' does not move to the beginning of the log buffer.  Instead,
>> an error message "No previous file" occurs.
>
> I'm not sure what that command is meant to do, even after reading the
> documentation and reading the code (and even reading the code doesn't
> help that much, because these are easy-mmode-define-navigation
> incantation).
>
> It searches for the prev instance of:
>
> log-view-file-re
> "^\\(?:Working file: \\(?1:.+\\)\\|\\(?:SCCS/s\\.\\|Changes to
> \\)\\(?1:.+\\):\\)
> "
>
> in the *vc-change-log* buffer?  But ... there's nothing like that in a
> git buffer?
>
> So `P'/`N' always fails for me.  Is this just code that has bitrotted,
> or is the use case just not...  explained well?

Perhaps these commands are CVS/RCS/SCCS-specific, and shouldn't be
enabled in general?  Because they're pretty confusing as is, and should
(at the very least) explain better what they're attempting to do.

I've added Stefan and Dmitry to the CCs; perhaps they have some insights
here.

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

Message #21 received at 14531 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Xue Fuqiao <xfq.free <at> gmail.com>, 9409 <at> debbugs.gnu.org,
 Dmitry Gutov <dgutov <at> yandex.ru>, 14531 <at> debbugs.gnu.org
Subject: Re: bug#14531: 24.3.50; `log-view-file-prev' doesn't move to the
 beginning of the log buffer
Date: Thu, 05 May 2022 15:58:34 -0400

Lars Ingebrigtsen [2022-05-05 14:28:00] wrote:
>>> In (info "(emacs) VC Change Log"):
>>>   `P'
>>>      Move to the log of the previous file, if showing logs for a
>>>      multi-file VC fileset.  Otherwise, just move to the beginning of
>>>      the log.  A numeric prefix argument is a repeat count.
[...]
> Perhaps these commands are CVS/RCS/SCCS-specific,

Indeed, I think this command doesn't make much sense in current VCSs.
It made sense for CVS where `cvs log <dir>` would give the logs of every
file in <dir>, one after the other.


        Stefan

Message #24 received at 14531 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Xue Fuqiao <xfq.free <at> gmail.com>, 9409 <at> debbugs.gnu.org,
 Dmitry Gutov <dgutov <at> yandex.ru>, 14531 <at> debbugs.gnu.org
Subject: Re: bug#14531: 24.3.50; `log-view-file-prev' doesn't move to the
 beginning of the log buffer
Date: Fri, 06 May 2022 13:45:49 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> Indeed, I think this command doesn't make much sense in current VCSs.
> It made sense for CVS where `cvs log <dir>` would give the logs of every
> file in <dir>, one after the other.

Right.  So I've now made new tiny derived log-view modes for these VCs,
and removed the bindings in the general log-view map in Emacs 29.

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

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