#!/bin/bash

getopt --test > /dev/null
if [[ $? -ne 4 ]]; then
    echo "I’m sorry, `getopt --test` failed in this environment."
    exit 1
fi

OPTIONS=dfo:v
LONGOPTIONS=debug,force,output:,verbose

# -temporarily store output to be able to check for errors
# -e.g. use “--options” parameter by name to activate quoting/enhanced mode
# -pass arguments only via   -- "$@"   to separate them correctly
PARSED=$(getopt --options=$OPTIONS --longoptions=$LONGOPTIONS --name "$0" -- "$@")
if [[ $? -ne 0 ]]; then
    # e.g. $? == 1
    #  then getopt has complained about wrong arguments to stdout
    exit 2
fi
# read getopt’s output this way to handle the quoting right:
eval set -- "$PARSED"

# now enjoy the options in order and nicely split until we see --
while true; do
    case "$1" in
        -d|--debug)
            d=y
            shift
            ;;
        -f|--force)
            f=y
            shift
            ;;
        -v|--verbose)
            v=y
            shift
            ;;
        -o|--output)
            outFile="$2"
            shift 2
            ;;
        --)
            shift
            break
            ;;
        *)
            echo "Programming error"
            exit 3
            ;;
    esac
done

# handle non-option arguments
if [[ $# -ne 1 ]]; then
    echo "$0: A single input file is required."
    exit 4
fi

echo "verbose: $v, force: $f, debug: $d, in: $1, out: $outFile"