thismux() {
	dir="$(pwd)"
	# Search upwards for `.run/thismux.sock`
	while [ "$dir" != "/" ]; do
		if [ -d "$dir/.run" ]; then
			tmux -S "$dir/.run/thismux.sock" "$@"
			return
		fi
		dir="$(dirname "$dir")"
	done
	echo "No .run found in any parent directory."
	return 1
}