On macOS when running Emacs in a terminal, the ns-system-appearance
variable is defined, but set to nil. We now cater for that, and simply
default to loading the dark theme.
Emacs will now change theme automatically on macOS when system
appearance is changed between light/dark. And also sets the appropriate
theme on startup too.
Instead of manually just setting faces after loading a doom-themes
theme, let's use a custom override theme which we apply right after
applying any doom-themes theme.
The override theme uses various doom-color helpers, so the colors it
uses will be based on the most recently applied doom-themes theme.
Change style back to a plain vertical line, but slightly narrower than
last time which I ended up not liking, while also aligning it to the
right hand side of the left fringe, so there's a gap between the window
border and the diff-hl status line. Also tweak the colors a bit.
I feel this works better, and keeps things nice and clean.
Due to changes to use-package's :custom option, my abuse of it to set
custom variables no longer works and yields errors.
Instead correctly set custom variables with defvar.
And also improve zoom-window color selection by adding a doom-themes
override for zoom-window, removing the hard-coded modeline background
color which was used before.
I've been using doom-themes' doom-vibrant for long enough now that I'm
certain I won't be moving away from it anytime soon. So let's simplify
and strip away all other theme setup stuff.
