Allow older applications to use dark mode in Mac OS X 10.14 (some may start crashing)

allow_dark_mode.sh

#!/bin/sh

if [ $# != 2 ]; then
	echo "Usage: $0 path/to/application.app [on|off|default]" >&2
	exit 1
fi

app="$1"
cmd="$2"

set -e

plist_path="${app}/Contents/Info.plist"
bundle_id="$(defaults read "${plist_path}" CFBundleIdentifier)" 

# Documentation on the property we're using here:
# https://developer.apple.com/documentation/appkit/nsappearancecustomization/choosing_a_specific_appearance_for_your_app

case "${cmd}" in
	on)
		defaults write "${bundle_id}" NSRequiresAquaSystemAppearance 0
		;;
	off)
		defaults write "${bundle_id}" NSRequiresAquaSystemAppearance 1
		;;
	default)
		defaults delete "${bundle_id}" NSRequiresAquaSystemAppearance
		;;
	*)
		echo "Unknown command: ${cmd}" >&2
		exit 1
esac