How to parse arguments passed to a shell script

parse-args.sh

parse_args() {
    while [[ $# -gt 0 ]]; do
        case $1 in
            -b|--branch) branch="$2" ;;
            -t|--tag) tag="$2" ;;
            --timeout) timeout="$2" ;;
            *) break ;;
        esac
        shift 2
    done
    rest=("$@")
}

parse_args "$@"