# what: the parser stops at the subcommand again, so flags after it are dropped
# why:  DU-H1 as it shipped: `dotup install --unattended` ran a FULL ATTENDED install and said nothing, which is how invasive packages reached a machine that had asked for the safe defaults
# kills: install --unattended refuses invasive too
# run:  unit
<<<OLD
CMD=
endopts=0
n=$#; i=0
while [ "$i" -lt "$n" ]; do
	i=$((i + 1)); a=$1; shift
	if [ "$endopts" -eq 0 ]; then
		case $a in
		--)           endopts=1; continue ;;
		--unattended) UNATTENDED=1; ASSUME_YES=1; continue ;;
		--print|-n)   DRYRUN=1; continue ;;
		--yes|-y)     ASSUME_YES=1; continue ;;
		-h|--help)    usage; exit 0 ;;
		-?*)          err "unknown flag: $a"; usage; exit 2 ;;
		esac
	fi
	# The first bare word is the subcommand; every later one is an operand,
	# rotated to the back of "$@" so the dispatch below reads them in the order
	# they were typed with the flags taken out from between them.
	if [ -z "$CMD" ]; then CMD=$a; else set -- "$@" "$a"; fi
done

# What each subcommand accepts. -1 is "as many as you like". An unknown
# subcommand, or one word more than a subcommand can use, is the same class of
# mistake as an unknown flag and gets the same answer: say so, and stop.
# This list and the dispatch below must name the same commands.
amin=0; amax=0
case ${CMD:-run} in
run|pick|install|private|render|expand-all|plan|preflight|fzf-path) ;;
toggle|toggle-shown|expand) amax=-1 ;;
preset|explain|resolve) amax=1 ;;
vercmp)                 amin=2; amax=2 ;;
*) err "unknown command: $CMD"; usage; exit 2 ;;
esac
[ "$#" -ge "$amin" ] || { err "${CMD:-run} needs $amin argument(s), got $#"; usage; exit 2; }
[ "$amax" -lt 0 ] || [ "$#" -le "$amax" ] || {
	err "${CMD:-run} takes at most $amax argument(s), got $#:$(printf ' %s' "$@")"
	usage; exit 2; }
<<<NEW
CMD=
while [ $# -gt 0 ]; do
	case $1 in
	--unattended) UNATTENDED=1; ASSUME_YES=1 ;;
	--print|-n)   DRYRUN=1 ;;
	--yes|-y)     ASSUME_YES=1 ;;
	-h|--help)    usage; exit 0 ;;
	--*)          err "unknown flag: $1"; usage; exit 2 ;;
	*)            CMD=$1; shift; break ;;
	esac
	shift
done
<<<END