#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  forever [-q] COMMAND...
		  forever -h
	EOF
}

help() {
	cat <<-'EOF'


		Options:
		  -q            quiet mode, don't print exit code messages
		  -h, --help    show this message

		  COMMAND       shell command to be wrapped


		Run COMMAND forever.


		Examples:

		  Print 123 forever:

		    $ forever echo 123
	EOF
}


for flag in "$@"; do
	case "$flag" in
		(--)
			break
			;;
		(--help)
			usage
			help
			exit
			;;
		(*)
			;;
	esac
done

QUIET=false
while getopts 'qh' flag; do
	case "$flag" in
		(q)
			QUIET=true
			;;
		(h)
			usage
			help
			exit
			;;
		(*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))

eval "$(assert-arg -- "${1:-}" 'COMMAND')"


while true; do
	STATUS=0
	"$@" || STATUS=$?
	if [ "$QUIET" = false ]; then
		printf 'Exitted with code %s.\n' "$STATUS" >&2
	fi
done