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

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

[Xue Fuqiao]

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@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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Features:
(shadow sort mail-extr emacsbug sendmail misearch multi-isearch log-view
pcvs-util whitespace diff-mode shell vc-annotate face-remap jka-compr
bookmark add-log vc-bzr checkdoc thingatpt org-element vc-git flyspell
ispell org-rmail org-mhe org-irc org-info org-gnus org-docview
org-bibtex bibtex org-bbdb org-w3m org org-macro org-footnote
org-pcomplete pcomplete org-list org-faces org-entities noutline outline
org-version ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table
ob-keys ob-exp ob-comint ob-core ob-eval org-compat org-macs
org-loaddefs find-func uniquify tsdh-dark-theme which-func imenu avoid
electric delsel image-file cus-start cus-load view mule-util cal-china
lunar solar cal-dst cal-bahai cal-islam cal-hebrew holidays hol-loaddefs
diary-lib diary-loaddefs cal-menu calendar cal-loaddefs time ielm pp
comint ansi-color ring server gnus-util message cl-macs gv format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mailabbrev mail-utils
gmm-utils mailheader ido keyfreq easy-mmode paren yasnippet byte-opt
warnings advice edmacro kmacro help-mode cl nadvice savehist eldoc
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
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Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/

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

[Glenn Morris]

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

bug#9409: bug#14531: 24.3.50; `log-view-file-prev' doesn't move to the beginning of the log buffer

[Lars Ingebrigtsen]

Xue Fuqiao <xfq.free@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@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

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

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@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

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

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

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

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

[Lars Ingebrigtsen]

Stefan Monnier <monnier@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