Re: night-mode?

[Jean Louis <bugs@gnu.support>]

* Eli Zaretskii <eliz@gnu.org> [2020-11-22 18:17]:
> > From: Juri Linkov <juri@linkov.net>
> > Date: Sun, 22 Nov 2020 10:40:19 +0200
> > Cc: emacs-devel@gnu.org
> > 
> > diff --git a/lisp/startup.el b/lisp/startup.el
> > index 9f67dfde12..71d640701b 100644
> > --- a/lisp/startup.el
> > +++ b/lisp/startup.el
> > @@ -834,6 +834,7 @@ tty-handle-args
> >                                 argval)))
> >                       default-frame-alist))
> >  	      ((member argi '("-r" "-rv" "-reverse"))
> > +	       (setq night-mode t)
> >  	       (push '(reverse . t)
> >                       default-frame-alist))
> >  	      ((equal argi "-color")
> 
> I don't see why we should consider -rv be the sign of "night".  Many
> people use dark backgrounds for reasons that have nothing to do with
> the time of day, and -rv is not such a sign, either.

Dark backgrounds are useful rather when it is dark around the
user such as for those behind thick curtains or in garages without
good lightning installations. This also includes wooden cabins that
are dark inside but have solar powerered batteries to run computers.

From that context maybe `night-mode' wants to call itself `dark-mode'
as it is useful in the darkness where brightness hurt eyes.

> I think we should ask users who'd want to have a special theme for the
> night and that routinely use the dark-background colors what would
> they like to see by night.  It isn't enough just to invert the colors,
> IMO.

There are those who have bright lights during the night and do not
sleep due to long sessions of thinking and programming but who do not
turn off the lights, and in that case those light backgrounds are
quite pleasing.

In other words day is not necessarily lighted and night is not
necessarily dark.