Re: Detecting changes between dark and light mode on Mac OS

[chad <yandros@gmail.com>]

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The conversations that I recall from around 5-10 years ago draw a fuzzy
line around this topic (which seems appropriate). On the one hand, Emacs
(GNU, the FSF, etc.) don't want to encourage people to use non-free systems
by making Emacs "better" on those systems, and on the other hand, there's a
recognition that the "baseline system support" for various OS's varies,
including across the free/non-free boundary. Combine that with the reality
that volunteer software is built by developers scratching itches, and
sometimes the non-free support will drift ahead for a bit.

For macos specifically, there's been an additional wrinkle in GNUstep,
although that seems (from a fairly far remove, admittedly) to have become
more and more vestigial over time.

All that said: there is support inside emacs for switching between light
and dark modes, at least inside the (included) modus vivendi/operandi pair
of themes. This includes the ability to set up modus so that it is
configured for both light and dark modes, has a very simple switch between
the two, and has a way to automate the switch (based on a timer and/or DBUS
message, IIRC). In practical terms, I believe that it should be ok to
develop this support for macos now as a "baseline system support" feature
that is either present or very nearly present on Emacs regardless of
platform. In fact, it would be best if the macos support for recognizing
the system-level switch and hook into whatever modus uses.

Hope that helps,
~Chad

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