bug#62229: 29.0.60; It's no longer possible to customize the xref ring size

bug#62229: 29.0.60; It's no longer possible to customize the xref ring size

[Spencer Baugh]

Emacs 28 had the function xref-set-marker-ring-length and the
customizable variable xref-marker-ring-length which allowed growing
the amount of history kept by xref.

This feature has been lost in Emacs 29; that variable has been
obsoleted with no replacement.

It's not clear, looking at the change, whether this is because the
size is now infinite or not.  The same commit that obsoleted that
variable added the similar tags-location-ring-length.  However that
variable has no docstring, no customize hooks, and setting it has no
effect unless tags-reset-tags-tables is called.

At the very least, all this should be documented better, and the
obsoleting of this function and variable should be mentioned in NEWS.
If the history is indeed infinite now, that should be mentioned in
NEWS as well.


In GNU Emacs 29.0.60 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.15.12, Xaw scroll bars) of 2023-03-13 built on
 igm-qws-u22796a
Repository revision: e759905d2e0828eac4c8164b09113b40f6899656
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: CentOS Linux 7 (Core)

Configured using:
 'configure --with-x-toolkit=lucid --with-modules
 --with-gif=ifavailable'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP
SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2
XPM LUCID ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Messages

Minor modes in effect:
  which-function-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  windmove-mode: t
  savehist-mode: t
  save-place-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-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
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

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/home/sbaugh/.local/src/emacs29/lisp/org/ox-publish hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ox-publish
/home/sbaugh/.local/src/emacs29/lisp/org/org-pcomplete hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/org-pcomplete
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/home/sbaugh/.local/src/emacs29/lisp/org/org-tempo hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/org-tempo
/home/sbaugh/.local/src/emacs29/lisp/org/org-macro hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/org-macro
/home/sbaugh/.local/src/emacs29/lisp/org/org-timer hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/org-timer
/home/sbaugh/.local/src/emacs29/lisp/org/ob-forth hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ob-forth
/home/sbaugh/.local/src/emacs29/lisp/org/ob-comint hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ob-comint
/home/sbaugh/.local/src/emacs29/lisp/org/ox-man hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ox-man
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/home/sbaugh/.local/src/emacs29/lisp/org/org hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/org
/home/sbaugh/.local/src/emacs29/lisp/org/ob-table hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ob-table
/home/sbaugh/.local/src/emacs29/lisp/org/ob-clojure hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ob-clojure
/home/sbaugh/.local/src/emacs29/lisp/org/ol-eshell hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ol-eshell
/home/sbaugh/.local/src/emacs29/lisp/org/ob-dot hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ob-dot
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/home/sbaugh/.local/src/emacs29/lisp/org/ob-lilypond hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ob-lilypond
/home/sbaugh/.local/src/emacs29/lisp/org/ob-groovy hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/ob-groovy
/home/sbaugh/.local/src/emacs29/lisp/org/org-feed hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/org-feed
/home/sbaugh/.local/src/emacs29/lisp/org/org-table hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/lisp/org-table
/home/sbaugh/.local/src/emacs29/lisp/org/ox-koma-letter hides /j/office/app/emacs/prod/.sink-2023-03-08_21-28-38.208139/jane-elisp/elisp/contrib/org/contrib/lisp/ox-koma-letter
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bug#62229: 29.0.60; It's no longer possible to customize the xref ring size

[Dmitry Gutov]

Hi!

On 17/03/2023 00:11, Spencer Baugh wrote:
> 
> Emacs 28 had the function xref-set-marker-ring-length and the
> customizable variable xref-marker-ring-length which allowed growing
> the amount of history kept by xref.
> 
> This feature has been lost in Emacs 29; that variable has been
> obsoleted with no replacement.
> 
> It's not clear, looking at the change, whether this is because the
> size is now infinite or not.  The same commit that obsoleted that
> variable added the similar tags-location-ring-length.  However that
> variable has no docstring, no customize hooks, and setting it has no
> effect unless tags-reset-tags-tables is called.
> 
> At the very least, all this should be documented better, and the
> obsoleting of this function and variable should be mentioned in NEWS.
> If the history is indeed infinite now, that should be mentioned in
> NEWS as well.

It is indeed infinite now, and limiting it would require additional effort.

Would you like to propose a patch for NEWS? I.e. describe it the way you 
prefer it had been described.

bug#62229: 29.0.60; It's no longer possible to customize the xref ring size

[Eli Zaretskii]

> From: Spencer Baugh <sbaugh@janestreet.com>
> Date: Thu, 16 Mar 2023 18:11:06 -0400
> 
> 
> Emacs 28 had the function xref-set-marker-ring-length and the
> customizable variable xref-marker-ring-length which allowed growing
> the amount of history kept by xref.
> 
> This feature has been lost in Emacs 29; that variable has been
> obsoleted with no replacement.
> 
> It's not clear, looking at the change, whether this is because the
> size is now infinite or not.  The same commit that obsoleted that
> variable added the similar tags-location-ring-length.  However that
> variable has no docstring, no customize hooks, and setting it has no
> effect unless tags-reset-tags-tables is called.
> 
> At the very least, all this should be documented better, and the
> obsoleting of this function and variable should be mentioned in NEWS.
> If the history is indeed infinite now, that should be mentioned in
> NEWS as well.

Indeed, that change paid very little attention to documenting the
important aspects of adding Xref history and using it instead of a
limited-size ring.  We should do better.

I've now attempted to add the missing documentation; please take a
look at the latest emacs-29 branch.

bug#62229: 29.0.60; It's no longer possible to customize the xref ring size

[Spencer Baugh]

[-- Attachment #1: Type: text/plain, Size: 1364 bytes --]

On Fri, Mar 17, 2023, 04:17 Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Spencer Baugh <sbaugh@janestreet.com>
> > Date: Thu, 16 Mar 2023 18:11:06 -0400
> >
> >
> > Emacs 28 had the function xref-set-marker-ring-length and the
> > customizable variable xref-marker-ring-length which allowed growing
> > the amount of history kept by xref.
> >
> > This feature has been lost in Emacs 29; that variable has been
> > obsoleted with no replacement.
> >
> > It's not clear, looking at the change, whether this is because the
> > size is now infinite or not.  The same commit that obsoleted that
> > variable added the similar tags-location-ring-length.  However that
> > variable has no docstring, no customize hooks, and setting it has no
> > effect unless tags-reset-tags-tables is called.
> >
> > At the very least, all this should be documented better, and the
> > obsoleting of this function and variable should be mentioned in NEWS.
> > If the history is indeed infinite now, that should be mentioned in
> > NEWS as well.
>
> Indeed, that change paid very little attention to documenting the
> important aspects of adding Xref history and using it instead of a
> limited-size ring.  We should do better.
>
> I've now attempted to add the missing documentation; please take a
> look at the latest emacs-29 branch.
>

Yes, looks great! Covers all my concerns!

>

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bug#62229: 29.0.60; It's no longer possible to customize the xref ring size

[Eli Zaretskii]

> From: Spencer Baugh <sbaugh@janestreet.com>
> Date: Fri, 17 Mar 2023 08:02:22 -0400
> Cc: 62229@debbugs.gnu.org
> 
> Yes, looks great! Covers all my concerns!

Thanks, so I'm closing this bug report.