#!/usr/bin/env bash
# Parse both short and long options using getopt

    usage() {
        printf 'Usage: %s [-v] [-o FILE] [--verbose] [--output FILE] INPUT\n' "$0"
    }

    verbose=false
    output_file=''
    positional=()

    # getopt with both short and long options
    parse_args() {
        getopt -o vo: --long verbose,output: -n "$0" -- "$@"
    }

    # Validate and parse
    if ! parsed=$(parse_args "$@"); then
        usage >&2
        exit 2
    fi

    # Set positional parameters from parsed output
    eval set -- "$parsed"

    while [ $# -gt 0 ]; do
        case $1 in
            -v|--verbose)
                verbose=true
                shift
                ;;
            -o|--output)
                output_file=$2
                shift 2
                ;;
            --output=*)
                output_file=${1#*=}
                shift
                ;;
            --)
                shift
                positional+=("$@")
                break
                ;;
            *)
                positional+=("$1")
                shift
                ;;
        esac
    done

    if [ ${#positional[@]} -ne 1 ]; then
        usage >&2
        exit 2
    fi

    input_file=${positional[0]}

    if [ "$verbose" = "true" ]; then
        printf 'Input: %s\n' "$input_file"
        printf 'Output: %s\n' "${output_file:-stdout}"
    fi