GNU bug report logs - #60340
29.0.60; force-mode-line-update does not update tab line

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

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.60; force-mode-line-update does not update tab line
Date: Mon, 26 Dec 2022 11:40:33 -0500

(defun random-name (_buffer &optional _buffers)
  (format "tab %d" (random 1000)))
(setq tab-line-tab-name-function #'random-name)
(tab-line-mode)

Then, eval:

(force-mode-line-update)

Every time that evals, I believe you should see the tab name update, but
it does not. This makes it impossible to change tab names without
changing buffer names as far as I can tell. There is likely something
I'm missing, but per the docs, I believe force-mode-line-update should
update tab lines. Passing `t' as ALL does not work either.


In GNU Emacs 29.0.60 (build 1, aarch64-apple-darwin22.2.0, NS
 appkit-2299.30 Version 13.1 (Build 22C65)) of 2022-12-22 built on
 Aarons-Laptop.local
Windowing system distributor 'Apple', version 10.3.2299
System Description:  macOS 13.1

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/opt/homebrew/share/emacs/site-lisp
 --infodir=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.60/share/info/emacs
 --prefix=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.60 --with-xml2
 --with-gnutls --with-native-compilation --without-compress-install
 --without-dbus --without-imagemagick --with-modules --with-rsvg
 --with-ns --disable-ns-self-contained 'CFLAGS=-Os -w -pipe
 -mmacosx-version-min=13
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk
 -DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT'
 'CPPFLAGS=-I/opt/homebrew/opt/zlib/include
 -I/opt/homebrew/opt/jpeg/include -I/opt/homebrew/opt/icu4c/include
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 -F/opt/homebrew/Frameworks
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 'LDFLAGS=-L/opt/homebrew/opt/zlib/lib -L/opt/homebrew/opt/jpeg/lib
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 -L/opt/homebrew/opt/readline/lib -L/opt/homebrew/lib
 -F/opt/homebrew/Frameworks -Wl,-headerpad_max_install_names
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk''

Configured features:
ACL GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB

Important settings:
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Major mode: ELisp/d

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  line-number-mode: t
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Memory information:
((conses 16 2120385 652982)
 (symbols 48 75538 984)
 (strings 32 311435 127711)
 (string-bytes 1 11301184)
 (vectors 16 171316)
 (vector-slots 8 3912332 1413547)
 (floats 8 1441 5909)
 (intervals 56 123901 862)
 (buffers 984 69))

Message #8 received at 60340 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 60340 <at> debbugs.gnu.org
Subject: Re: bug#60340: 29.0.60;
 force-mode-line-update does not update tab line
Date: Mon, 26 Dec 2022 19:04:33 +0200

> From: Aaron Jensen <aaronjensen <at> gmail.com>
> Date: Mon, 26 Dec 2022 11:40:33 -0500
> 
> 
> (defun random-name (_buffer &optional _buffers)
>   (format "tab %d" (random 1000)))
> (setq tab-line-tab-name-function #'random-name)
> (tab-line-mode)
> 
> Then, eval:
> 
> (force-mode-line-update)
> 
> Every time that evals, I believe you should see the tab name update, but
> it does not. This makes it impossible to change tab names without
> changing buffer names as far as I can tell. There is likely something
> I'm missing, but per the docs, I believe force-mode-line-update should
> update tab lines. Passing `t' as ALL does not work either.

force-mode-line-update updates what's displayed on the line, but it
doesn't recompute tab-line-format.  And that is what you want to do:
you customize tab-line-tab-name-function, which affects
tab-line-format.

IOW, if your format has %d, and %d formats some number which changes
with time, then you can expect that force-mode-line-update will cause
a different string be displayed instead of %d.  But you _cannot_
expect that the format string which includes %d will be recalculated
just because you called force-mode-line-update.

If you want the displayed values to change when the line is
redisplayed, you need to use :eval or somesuch.

Message #11 received at 60340 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 60340 <at> debbugs.gnu.org
Subject: Re: bug#60340: 29.0.60; force-mode-line-update does not update tab
 line
Date: Mon, 26 Dec 2022 19:34:04 +0200

> (defun random-name (_buffer &optional _buffers)
>   (format "tab %d" (random 1000)))
> (setq tab-line-tab-name-function #'random-name)
> (tab-line-mode)
>
> Then, eval:
>
> (force-mode-line-update)
>
> Every time that evals, I believe you should see the tab name update, but
> it does not. This makes it impossible to change tab names without
> changing buffer names as far as I can tell. There is likely something
> I'm missing, but per the docs, I believe force-mode-line-update should
> update tab lines. Passing `t' as ALL does not work either.

Does it help to override the cache key with something like this?

(defun tab-line-cache-key-default (_tabs)
  (list (random 1000)))

Message #14 received at 60340 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 60340-done <at> debbugs.gnu.org, 60340 <at> debbugs.gnu.org
Subject: Re: bug#60340: 29.0.60;
 force-mode-line-update does not update tab line
Date: Mon, 26 Dec 2022 12:55:11 -0500

On Mon, Dec 26, 2022 at 12:04 PM Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> > From: Aaron Jensen <aaronjensen <at> gmail.com>
> > Date: Mon, 26 Dec 2022 11:40:33 -0500
> >
> >
> > (defun random-name (_buffer &optional _buffers)
> >   (format "tab %d" (random 1000)))
> > (setq tab-line-tab-name-function #'random-name)
> > (tab-line-mode)
> >
> > Then, eval:
> >
> > (force-mode-line-update)
> >
> > Every time that evals, I believe you should see the tab name update, but
> > it does not. This makes it impossible to change tab names without
> > changing buffer names as far as I can tell. There is likely something
> > I'm missing, but per the docs, I believe force-mode-line-update should
> > update tab lines. Passing `t' as ALL does not work either.
>
> force-mode-line-update updates what's displayed on the line, but it
> doesn't recompute tab-line-format.  And that is what you want to do:
> you customize tab-line-tab-name-function, which affects
> tab-line-format.
>
> IOW, if your format has %d, and %d formats some number which changes
> with time, then you can expect that force-mode-line-update will cause
> a different string be displayed instead of %d.  But you _cannot_
> expect that the format string which includes %d will be recalculated
> just because you called force-mode-line-update.
>
> If you want the displayed values to change when the line is
> redisplayed, you need to use :eval or somesuch.

It uses :eval out of the box. The problem was the cache as Juri pointed out.


On Mon, Dec 26, 2022 at 12:35 PM Juri Linkov <juri <at> linkov.net> wrote:
>
>
> (defun tab-line-cache-key-default (_tabs)
>   (list (random 1000)))

Thank you for the pointer! I can do this and it works great:

(set-window-parameter nil 'tab-line-cache nil)
(force-mode-line-update)

Message #22 received at 60340 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 60340 <at> debbugs.gnu.org
Subject: Re: bug#60340: 29.0.60; force-mode-line-update does not update tab
 line
Date: Wed, 28 Dec 2022 19:49:20 +0200

>> (defun tab-line-cache-key-default (_tabs)
>>   (list (random 1000)))
>
> Thank you for the pointer! I can do this and it works great:
>
> (set-window-parameter nil 'tab-line-cache nil)
> (force-mode-line-update)

Maybe this call is straightforward enough not to warrant a new special
function to clear the cache.  Anyway, your complex use case prompted
the need to allow more flexibility in tab-line-cache-key-function
that now I improved as well.

Message #25 received at 60340 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: Juri Linkov <juri <at> linkov.net>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 60340 <at> debbugs.gnu.org
Subject: Re: bug#60340: 29.0.60;
 force-mode-line-update does not update tab line
Date: Thu, 29 Dec 2022 17:46:07 -0500

On Wed, Dec 28, 2022 at 12:50 PM Juri Linkov <juri <at> linkov.net> wrote:
>
> >> (defun tab-line-cache-key-default (_tabs)
> >>   (list (random 1000)))
> >
> > Thank you for the pointer! I can do this and it works great:
> >
> > (set-window-parameter nil 'tab-line-cache nil)
> > (force-mode-line-update)
>
> Maybe this call is straightforward enough not to warrant a new special
> function to clear the cache.  Anyway, your complex use case prompted
> the need to allow more flexibility in tab-line-cache-key-function
> that now I improved as well.

A function may be useful just for discoverability purposes. At the
very least, it may make sense to add additional documentation to
`tab-line-tab-name-function` that its result is effectively cached.

Thanks,

Aaron

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