bug#50849: 28.0.50; Proposal for Emacs daemon to signal when being busy

[Jean Louis]

This is wish for the feature or proposal for Emacs daemon to somehow
signal to `emacsclient' to be busy.

We know that if there is no daemon there is environment variable to
spawn some editor instead, which could be like `emacs -Q' or even `vim'

If however, the Emacs daemon spawned by `emacs --bg-daemon' is busy for
example playing video or doing some other process, then `emacsclient'
cannot know about it and is waiting in background.

It would be good to provide some kind of a signal that main Emacs
process is busy so that `emacsclient' can know about it and for example
spawn the alternative editor in that situation. This feature could be
then enabled through customization or variable.




In GNU Emacs 28.0.50 (build 7, x86_64-pc-linux-gnu, X toolkit, cairo version 
1.17.4, Xaw3d scroll bars)
 of 2021-09-21 built on protected.rcdrun.com
Repository revision: f23c5c3e445385031d46ee56b89fcda1774a2108
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Parabola GNU/Linux-libre

Configured using:
 'configure --with-x-toolkit=lucid'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11
XAW3D XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util rmail
rmail-loaddefs auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map text-property-search time-date
subr-x seq byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
iso-transl tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 54696 7081)
 (symbols 48 7163 3)
 (strings 32 20184 2198)
 (string-bytes 1 644302)
 (vectors 16 14728)
 (vector-slots 8 192430 11692)
 (floats 8 23 45)
 (intervals 56 267 0)
 (buffers 992 12))

-- 
Thanks,
Jean Louis

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