GNU bug report logs - #24291
25.1; display-time-world seems to ignore zoneinfo-style-world-list when display-time-mode is t

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

From: nljlistbox2 <at> gmail.com (N. Jackson)
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1;
 display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Tue, 23 Aug 2016 08:50:53 -0300

The command display-time-world seems to be ignoring the
zoneinfo-style-world-list variable; instead, the time for the default
list of cities is displayed.

Setting zoneinfo-style-world-list in `emacs -Q' works as expected, so I
bisected my init file and it seems that the problem is "caused" by
setting display-time-mode to show the clock in the mode line.

This recipe shows the problem from `emacs -Q'

0. emacs -Q

1. Enter the following elisp in *scratch*:

  (custom-set-variables
   '(display-time-mode t)
   '(zoneinfo-style-world-list
     (quote
      (("Etc/UTC" "Universal Time")
       ("AST4ADT" "Atlantic Time")
       ("EST5EDT" "Eastern Time")
       ("Europe/London" "London")
       ("Asia/Tokyo" "Tokyo")))))

2. `C-x C-e' (eval-last-sexp) to run it

3. `M-x display-time-world'

Observed result:

  Seattle   Tuesday 23 August 04:22 PDT
  New York  Tuesday 23 August 07:22 EDT
  London    Tuesday 23 August 12:22 BST
  Paris     Tuesday 23 August 13:22 CEST
  Bangalore Tuesday 23 August 16:52 IST
  Tokyo     Tuesday 23 August 20:22 JST

Expected result:

  Universal Time Tuesday 23 August 11:24 UTC
  Atlantic Time  Tuesday 23 August 08:24 ADT
  Eastern Time   Tuesday 23 August 07:24 EDT
  London         Tuesday 23 August 12:24 BST
  Tokyo          Tuesday 23 August 20:24 JST


If the recipe above is modified to remove the line that sets
display-time-mode, the output is as expected.

I'm more than slightly confused by what I'm observing here. I don't
believe it was more than a couple of months ago that I set z-s-w-l for
the first time. It worked perfectly then even though I always have d-t-m
on (because the mode line clock is the one I use to know what time it is
during the day). But now I'm seeing the reported problem in versions of
the Emacs 25 pre-release going back for months, and indeed, in Emacs
24.5.


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


Features:
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tramp-loaddefs trampver ucs-normalize json map sh-script smie executable
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tex dbus xml tex-mode shell flyspell ispell sage sage-load rx
emms-bookmarks emms-cue emms-mode-line-icon emms-browser sort
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bbdb-loaddefs finder-inf tex-site info package epg-config seq byte-opt
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Memory information:
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Message #8 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: nljlistbox2 <at> gmail.com (N. Jackson)
Cc: 24291 <at> debbugs.gnu.org
Subject: Re: bug#24291: 25.1;
 display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Tue, 23 Aug 2016 17:43:29 +0300

> From: nljlistbox2 <at> gmail.com (N. Jackson)
> Date: Tue, 23 Aug 2016 08:50:53 -0300
> 
> 0. emacs -Q
> 
> 1. Enter the following elisp in *scratch*:
> 
>   (custom-set-variables
>    '(display-time-mode t)
>    '(zoneinfo-style-world-list
>      (quote
>       (("Etc/UTC" "Universal Time")
>        ("AST4ADT" "Atlantic Time")
>        ("EST5EDT" "Eastern Time")
>        ("Europe/London" "London")
>        ("Asia/Tokyo" "Tokyo")))))
> 
> 2. `C-x C-e' (eval-last-sexp) to run it
> 
> 3. `M-x display-time-world'
> 
> Observed result:
> 
>   Seattle   Tuesday 23 August 04:22 PDT
>   New York  Tuesday 23 August 07:22 EDT
>   London    Tuesday 23 August 12:22 BST
>   Paris     Tuesday 23 August 13:22 CEST
>   Bangalore Tuesday 23 August 16:52 IST
>   Tokyo     Tuesday 23 August 20:22 JST
> 
> Expected result:
> 
>   Universal Time Tuesday 23 August 11:24 UTC
>   Atlantic Time  Tuesday 23 August 08:24 ADT
>   Eastern Time   Tuesday 23 August 07:24 EDT
>   London         Tuesday 23 August 12:24 BST
>   Tokyo          Tuesday 23 August 20:24 JST

You need to set zoneinfo-style-world-list before time.el is loaded.

Message #11 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: nljlistbox2 <at> gmail.com (N. Jackson)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24291 <at> debbugs.gnu.org
Subject: Re: bug#24291: 25.1;
 display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Tue, 23 Aug 2016 16:39:21 -0300

At 17:43 +0300 on Tuesday 2016-08-23, Eli Zaretskii wrote:

>> From: nljlistbox2 <at> gmail.com (N. Jackson)
>> Date: Tue, 23 Aug 2016 08:50:53 -0300
>> 
>> 0. emacs -Q
>> 
>> 1. Enter the following elisp in *scratch*:
>> 
>>   (custom-set-variables
>>    '(display-time-mode t)
>>    '(zoneinfo-style-world-list
>>      (quote
>>       (("Etc/UTC" "Universal Time")
>>        ("AST4ADT" "Atlantic Time")
>>        ("EST5EDT" "Eastern Time")
>>        ("Europe/London" "London")
>>        ("Asia/Tokyo" "Tokyo")))))
>> 
>> 2. `C-x C-e' (eval-last-sexp) to run it
>> 
>> 3. `M-x display-time-world'
>> 
>> Observed result:
>> 
>>   Seattle   Tuesday 23 August 04:22 PDT
>>   New York  Tuesday 23 August 07:22 EDT
>>   London    Tuesday 23 August 12:22 BST
>>   Paris     Tuesday 23 August 13:22 CEST
>>   Bangalore Tuesday 23 August 16:52 IST
>>   Tokyo     Tuesday 23 August 20:22 JST
>> 
>> Expected result:
>> 
>>   Universal Time Tuesday 23 August 11:24 UTC
>>   Atlantic Time  Tuesday 23 August 08:24 ADT
>>   Eastern Time   Tuesday 23 August 07:24 EDT
>>   London         Tuesday 23 August 12:24 BST
>>   Tokyo          Tuesday 23 August 20:24 JST
>
> You need to set zoneinfo-style-world-list before time.el is loaded.

I see. Then maybe showing he problem from `emacs -Q' requires a more
carefully-crafted example.

But this doesn't work when I run Emacs normally, and in that case I'm
not doing anything unusual. I don't know when time.el is loaded with
respect to when my init file is run. But even if I comment out my entire
init file except for this snippet, this problem occurs.

I can't change the order because Customize puts its variables in
alphabetical order.

N.

Message #14 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: nljlistbox2 <at> gmail.com (N. Jackson)
Cc: 24291 <at> debbugs.gnu.org
Subject: Re: bug#24291: 25.1;
 display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Wed, 24 Aug 2016 05:38:27 +0300

> From: nljlistbox2 <at> gmail.com (N. Jackson)
> Cc: 24291 <at> debbugs.gnu.org
> Date: Tue, 23 Aug 2016 16:39:21 -0300
> 
> I can't change the order because Customize puts its variables in
> alphabetical order.

You can use setq instead.

Message #17 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: "N. Jackson" <nljlistbox2 <at> gmail.com>, 24291 <at> debbugs.gnu.org
Subject: Re: bug#24291: 25.1;
 display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Wed, 24 Aug 2016 01:40:02 -0400

Sounds like zoneinfo-style-world-list needs a :set function to update
any existing display.

Message #20 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: nljlistbox2 <at> gmail.com (N. Jackson)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24291 <at> debbugs.gnu.org
Subject: Re: bug#24291: 25.1;
 display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Wed, 24 Aug 2016 18:03:03 -0300

At 05:38 +0300 on Wednesday 2016-08-24, Eli Zaretskii wrote:

>> From: nljlistbox2 <at> gmail.com (N. Jackson)
>> Cc: 24291 <at> debbugs.gnu.org
>> Date: Tue, 23 Aug 2016 16:39:21 -0300
>> 
>> I can't change the order because Customize puts its variables in
>> alphabetical order.
>
> You can use setq instead.

Hi Eli,

I'm not clear what you're telling me here.

If you're saying that there is a workaround available to me, then thank
you. Yes, indeed setq works.

If you are saying that there is no problem because the user can use
setq instead of using Customize, then I think I disagree. To me it
doesn't make sense for Emacs to have a variable that is "Customizable"
if using Customize to set it doesn't work reliably.

N.

Message #23 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: nljlistbox2 <at> gmail.com (N. Jackson)
Cc: 24291 <at> debbugs.gnu.org
Subject: Re: bug#24291: 25.1;
 display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Thu, 25 Aug 2016 05:40:31 +0300

> From: nljlistbox2 <at> gmail.com (N. Jackson)
> Cc: 24291 <at> debbugs.gnu.org
> Date: Wed, 24 Aug 2016 18:03:03 -0300
> 
> At 05:38 +0300 on Wednesday 2016-08-24, Eli Zaretskii wrote:
> 
> >> From: nljlistbox2 <at> gmail.com (N. Jackson)
> >> Cc: 24291 <at> debbugs.gnu.org
> >> Date: Tue, 23 Aug 2016 16:39:21 -0300
> >> 
> >> I can't change the order because Customize puts its variables in
> >> alphabetical order.
> >
> > You can use setq instead.
> 
> Hi Eli,
> 
> I'm not clear what you're telling me here.
> 
> If you're saying that there is a workaround available to me, then thank
> you. Yes, indeed setq works.
> 
> If you are saying that there is no problem because the user can use
> setq instead of using Customize, then I think I disagree. To me it
> doesn't make sense for Emacs to have a variable that is "Customizable"
> if using Customize to set it doesn't work reliably.

Knowing me and my attitude towards Emacs, what do you think I'm
saying?

Message #26 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: "N. Jackson" <nljlistbox2 <at> gmail.com>
Cc: 24291 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Mon, 2 Oct 2017 00:10:09 -0700

[Message part 1 (text/plain, inline)]

This seems to be a clear bug in time.el, as a customizable variable's initial 
value should not depend on that of another customizable variable. Proposed patch 
attached.

[0001-Fix-customization-of-zoneinfo-style-world-list.patch (text/x-patch, attachment)]

Message #31 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: nljlistbox2 <at> gmail.com, 24291 <at> debbugs.gnu.org
Subject: Re: display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Mon, 02 Oct 2017 19:00:56 +0300

> Cc: 24291 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> Date: Mon, 2 Oct 2017 00:10:09 -0700
> 
> This seems to be a clear bug in time.el, as a customizable variable's initial 
> value should not depend on that of another customizable variable. Proposed patch 
> attached.

LGTM, thanks.

Message #36 received at 24291-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: nljlistbox2 <at> gmail.com, 24291-done <at> debbugs.gnu.org
Subject: Re: display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Mon, 2 Oct 2017 09:08:01 -0700

OK, I installed it on emacs-26 and am closing the bug.

Message #39 received at 24291 <at> debbugs.gnu.org (full text, mbox):

From: nljlistbox2 <at> gmail.com (N. Jackson)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 24291 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: display-time-world seems to ignore zoneinfo-style-world-list when
 display-time-mode is t
Date: Mon, 02 Oct 2017 13:00:55 -0400

Hello Paul,

At 00:10 -0700 on Monday 2017-10-02, Paul Eggert wrote:
>
> This seems to be a clear bug in time.el, as a customizable
> variable's initial value should not depend on that of another
> customizable variable. Proposed patch attached.

I have just tested your proposed patch, and it fixes the problem
here.

(I'm on a recent version of the emacs-26 branch:

In GNU Emacs 26.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.17)
 of 2017-10-02 built on moondust.localdomain
Repository revision: 8b2ab5014b2c1641bb62efa63b9ee54b4c056b5a
Windowing system distributor 'Fedora Project', version 11.0.11903000
System Description:	Fedora release 25 (Twenty Five)

.)

Thank you.

N.

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