#!/bin/sh
set -eu

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

help() {
	cat <<-'EOF'

		Options:
		  -h, --help    show this message


		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

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

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


while true; do
	STATUS=0
	"$@" || STATUS=$?
	printf 'Exitted with code %s.\n' "$STATUS" >&2
done