bug#24282: 25.1; Better search overwrapping behaviour for `,' in Info?

bug#24282: 25.1; Better search overwrapping behaviour for `,' in Info?

[N. Jackson]

When doing an index search of an Info manual using `i', the `,' command
(which cycles through the matches) silently overwraps the search past
the starting point.

Often when I'm searching, I'll have a vague feeling I've seen the same
node several times before I realise that my search has overwrapped and
that I'm just going around in circles.

[The start of the overwrapping is not as easy to spot as it might be
because the matches seem to be ordered randomly and the same node can
legitimately occur more than once. (Are they ordered by relevance
perhaps?)]

I think it would be better (perhaps as an option) if the `,' command
provided an indication when the search overwraps / would overwrap.
Perhaps it could just print an error message instead of overwrapping.
(I'm thinking of isearch's behaviour, when a search would wrap.) A
message something like:

  No more matches, use `,' to continue from start of list.


By the way, I notice that the documentation for Info-index-next is hard
to read -- especially the two consecutive commas in the second paragraph
-- because it seems to be missing some punctuation. The output from
`C-h f Info-index-next RET' begins:

  , runs the command Info-index-next (found in Info-mode-map), which is
  an interactive compiled Lisp function in `info.el'.

  It is bound to ,, <menu-bar> <Info> <Index> <Next Matching Item>.

Shouldn't this say:

  `,' runs the command Info-index-next (found in Info-mode-map), which
  is an interactive compiled Lisp function in `info.el'.

  It is bound to `,', <menu-bar> <Info> <Index> <Next Matching Item>.

Or, better yet:

  `,' runs the command Info-index-next (found in Info-mode-map), which
  is an interactive compiled Lisp function in `info.el'.

  It is bound to `,' and <menu-bar> <Info> <Index> <Next Matching Item>.


In GNU Emacs 25.1.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-07-24 built on moondust
Windowing system distributor 'Fedora Project', version 11.0.11803000
System Description:	Fedora release 23 (Twenty Three)

Configured using:
 'configure --prefix=/home/nlj/local/ --enable-checking=yes,glyphs
 --enable-check-lisp-object-type 'CFLAGS=-O2 -g3 -gdwarf-4''

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

Important settings:
  value of $LC_MONETARY: en_DK.utf8
  value of $LC_NUMERIC: en_DK.utf8
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Help

Minor modes in effect:
  semantic-minor-modes-format: ((:eval (if (or semantic-highlight-edits-mode semantic-show-unmatched-syntax-mode)  S)))
  diff-auto-refine-mode: t
  TeX-PDF-mode: t
  shell-dirtrack-mode: t
  pdf-occur-global-minor-mode: t
  recentf-mode: t
  show-paren-mode: t
  savehist-mode: t
  save-place-mode: t
  electric-pair-mode: t
  display-time-mode: t
  display-battery-mode: t
  desktop-save-mode: t
  delete-selection-mode: t
  cua-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  temp-buffer-resize-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
Found `set-mark-command-repeat-pop' in Variable Index.  (6 total; use `,' for next)
Type "q" in help window to restore its previous buffer.
Found `repeating a command' in Concept Index.  (6 total; use `,' for next)

ESC C-M-x C-b is undefined
Quit
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help
Auto-saving...done
<mouse-7> is undefined

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bug#24282: 25.1; Better search overwrapping behaviour for `,' in Info?

[Eli Zaretskii]

> From: nljlistbox2@gmail.com (N. Jackson)
> Date: Sun, 21 Aug 2016 16:57:31 -0300
> 
> When doing an index search of an Info manual using `i', the `,' command
> (which cycles through the matches) silently overwraps the search past
> the starting point.
> 
> Often when I'm searching, I'll have a vague feeling I've seen the same
> node several times before I realise that my search has overwrapped and
> that I'm just going around in circles.
> 
> [The start of the overwrapping is not as easy to spot as it might be
> because the matches seem to be ordered randomly and the same node can
> legitimately occur more than once. (Are they ordered by relevance
> perhaps?)]
> 
> I think it would be better (perhaps as an option) if the `,' command
> provided an indication when the search overwraps / would overwrap.
> Perhaps it could just print an error message instead of overwrapping.
> (I'm thinking of isearch's behaviour, when a search would wrap.) A
> message something like:
> 
>   No more matches, use `,' to continue from start of list.

This is what the stand-alone Info reader does, except that it also
beeps, as when the user makes a mistake.  Frankly, I was always
annoyed that Emacs doesn't behave that way, so I'd welcome an option
to make it behave like the stand-alone reader.

Thanks.

bug#24282: 25.1; Better search overwrapping behaviour for `,' in Info?

[Eli Zaretskii]

> From: nljlistbox2@gmail.com (N. Jackson)
> Date: Sun, 21 Aug 2016 16:57:31 -0300
> 
> By the way, I notice that the documentation for Info-index-next is hard
> to read -- especially the two consecutive commas in the second paragraph
> -- because it seems to be missing some punctuation. The output from
> `C-h f Info-index-next RET' begins:
> 
>   , runs the command Info-index-next (found in Info-mode-map), which is
>   an interactive compiled Lisp function in `info.el'.
> 
>   It is bound to ,, <menu-bar> <Info> <Index> <Next Matching Item>.
> 
> Shouldn't this say:
> 
>   `,' runs the command Info-index-next (found in Info-mode-map), which
>   is an interactive compiled Lisp function in `info.el'.
> 
>   It is bound to `,', <menu-bar> <Info> <Index> <Next Matching Item>.

No, we don't quote key sequences in the *Help* buffers.  We never did,
AFAIR.  Compare with "C-h k C-x C-s", for example.

bug#24282: 25.1; Better search overwrapping behaviour for `,' in Info?

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> This is what the stand-alone Info reader does, except that it also
> beeps, as when the user makes a mistake.  Frankly, I was always
> annoyed that Emacs doesn't behave that way, so I'd welcome an option
> to make it behave like the stand-alone reader.

I've now added this to Emacs 28 -- and defaulted it to "on" (via the
Info-warn-on-index-alternatives-wrap user option) because I think it's
probably what most new users would want.

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

bug#24282: 25.1; Better search overwrapping behaviour for `,' in Info?

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: nljlistbox2@gmail.com (N. Jackson),  24282@debbugs.gnu.org
> Date: Tue, 06 Jul 2021 18:57:52 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > This is what the stand-alone Info reader does, except that it also
> > beeps, as when the user makes a mistake.  Frankly, I was always
> > annoyed that Emacs doesn't behave that way, so I'd welcome an option
> > to make it behave like the stand-alone reader.
> 
> I've now added this to Emacs 28 -- and defaulted it to "on" (via the
> Info-warn-on-index-alternatives-wrap user option) because I think it's
> probably what most new users would want.

Thanks.  I will certainly want that.