GNU bug report logs - #52235
29.0.50; Suggestion: refactor time.el into a more general 'clock' framework

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From: Arthur Miller <arthur.miller <at> live.com>
To: 52235 <at> debbugs.gnu.org
Subject: bug#52235: 29.0.50; Suggestion: refactor time.el into a more general 'clock' framework
Date: Thu, 02 Dec 2021 00:08:37 +0100

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

Last few days I have being playing with a clock just to test the transparency,
and what I have noticed is that I don't see some framework to work with clock
time. For tests I have used timer + 60s to get per minut update, but that is of
course skew time.

Emacs has a better "clock" framework in form of 'display-time-mode', but it is
explicitly coupled to mode-line updates. So any application that would like to
per-use it, will also trigger mode-line re-display, regardless if user have
'display-time-mode' on or not.

My idea to per-use it is to simply run 'update-hooks' on clock beat, so any
application can register a hook that will be called on a "clock beat". While it
is maybe not so super-synchronized with system clock, it still gives impression
of clocks in Emacs be synchronized.

Changes look bigger than they are, but I have made some let-bound variables
global, so I can use them as precalculated variables instead of calculating them
in the application code. I am not sure if it is correct. but it's just a test.

Allaround naming is bad, but I tried to be completely backward compatible, so I
had to preserve the old hook/var/mode names.

Example usage is in attached emvac-vision-clock.el, with attached screenshot of
it running.

I haven't thought of how/when to kill timer and internal minor mode properly; I
guess when hooks variable could be tested for nil, but I haven't done it yet.

[time.el.patch (text/x-patch, attachment)]

[emacs-vision-clock.el (text/plain, attachment)]

[clock-on-refactored-time.el.png (image/png, attachment)]

[Message part 5 (text/plain, inline)]

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.17.4)
 of 2021-11-28 built on pascal
Repository revision: f5498a608fe85b66a4068a5ccf88c9b3d3b88f98
Repository branch: private
Windowing system distributor 'The X.Org Foundation', version 11.0.12101001
System Description: Arch Linux

Configured using:
 'configure --with-native-compilation 'CFLAGS=-O2 -mtune=native -march=native''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE
XIM XPM GTK3 ZLIB

Important settings:
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Major mode: Text

Minor modes in effect:
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  helm-mode: t
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  column-number-mode: t
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  auto-fill-function: do-auto-fill
  transient-mark-mode: t
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Load-path shadows:
/home/arthur/repos/emacs/lisp/transient hides /home/arthur/.emacs.d/elpa/transient-20210723.1601/transient
/home/arthur/.emacs.d/elpa/lispy-20210914.1209/elpa hides /home/arthur/.emacs.d/elpa/ivy-20210930.1450/elpa
/home/arthur/repos/emacs/lisp/emacs-lisp/helper hides /home/arthur/.emacs.d/elpa/helper-0.5/helper
/home/arthur/.emacs.d/lisp/helm-git-branch hides /home/arthur/.emacs.d/elpa/helm-git-branch-0.1/helm-git-branch
/home/arthur/.emacs.d/elpa/elisp-refs-20211009.1531/elisp-refs hides /home/arthur/.emacs.d/elpa/elisp-refs-1.4/elisp-refs
/home/arthur/.emacs.d/elpa/elisp-refs-20211009.1531/elisp-refs-autoloads hides /home/arthur/.emacs.d/elpa/elisp-refs-1.4/elisp-refs-autoloads
/home/arthur/.emacs.d/elpa/elisp-refs-20211009.1531/elisp-refs-pkg hides /home/arthur/.emacs.d/elpa/elisp-refs-1.4/elisp-refs-pkg
/home/arthur/.emacs.d/lisp/company-cmake hides /home/arthur/.emacs.d/elpa/company-20211002.1732/company-cmake

Features:
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Memory information:
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 (symbols 48 42638 423)
 (strings 32 149107 107480)
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