#!/bin/sh

usage() {
	printf "Usage: %s [-t TIMEOUT] [-c COMMAND]\n\n" "$0"
	printf "TIMEOUT and COMMAND can be set as env vars.\n"
}

on_interrupt() {
	print "Process aborted!\n"

	exit 130
}

create_script() {
	printf "#!/bin/sh\n%s\n" "$1" > "$2"
	chmod +x "$SCRIPT_FILE"
}

run_script() {
	"$SCRIPT_FILE" >/dev/null 2>&1 &

	printf "%d" $!
}

stop_delete_script() {
	kill -9 $1
	rm -f "$2"
}

check_pid() {
	PID=$1
	LOOP=$2

	for i in $(seq 1 $LOOP); do
		test -d "/proc/$PID/" && sleep 1 || STATUS=0
	done

	kill -9 $PID

	printf "%d" ${STATUS:-1}
}

main() {
	while getopts "ht:c:" option; do
		case "${option}" in
			h) usage; exit 0;;
			t) TIMEOUT="$OPTARG";;
			c) COMMAND="$OPTARG";;
			*) usage; exit 1;;
		esac
	done

	TIMEOUT="${TIMEOUT:-10}"

	if [ -z "$COMMAND" ]; then
		printf "Command is required!\n"
		exit 1
	fi

	SCRIPT_FILE="$(mktemp)"

	create_script "$COMMAND" "$SCRIPT_FILE"

	SCRIPT_PID=$(run_script "$SCRIPT_FILE")
	EXIT_STATUS=$(check_pid "$SCRIPT_PID" "$TIMEOUT")

	stop_delete_script $PID "$SCRIPT_FILE"

	exit $EXIT_STATUS
}

trap on_interrupt INT

main "$@"