function notify() {
    local title
    local message
    local subtitle
    local sound
    local command
    local rc

    command=()

    while [[ "${#}" -gt 0 ]]; do
        case "${1}" in
            -t|--title)
                title="${2}"
                shift
                ;;
            -s|--subtitle)
                subtitle="${2}"
                shift
                ;;
            -m|--message)
                message="${2}"
                shift
                ;;
            -S|--sound)
                if [[ -z "${2:-}" || "${2}" == '-*' ]]; then
                    sound='1'
                else
                    sound="${2}"
                    shift
                fi
                ;;
            --)
                shift
                command=("${@}")
                break
                ;;
            *)
                command=("${@}")
                break
                ;;
        esac

        shift
    done

    if [[ "${#command[@]}" -gt 0 ]]; then
        "${command[@]}"
        rc="${?}"
    fi

    if [[ -z "${title}" && "${#command[@]}" -gt 0 ]]; then
        title="${command[*]}"
    fi

    if [[ -z "${message}" && "${#command[@]}" -gt 0 ]]; then
        message="exit ${rc}"
    fi

    if [[ -z "${message}" ]]; then
        echo 'error: missing message' 1>&2
        return 1
    fi

    if [[ -z "${title}" ]]; then
        title="${0}"
    fi

    script='display notification "'"${message}"'"'

    if [[ -n "${title}" || -n "${subtitle}" || -n "${sound}" ]]; then
        script+=' with'
    fi

    if [[ -n "${title}" ]]; then
        script+=' title "'"${title}"'"'
    fi

    if [[ -n "${subtitle}" ]]; then
        script+=' subtitle "'"${subtitle}"'"'
    fi

    if [[ -n "${sound}" ]]; then
        script+=' sound name "'"${sound}"'"'
    fi

    osascript -e "${script}"

    return "${rc}"
}

# vim: ft=bash