Bash options parser

0optParser.sh

# this script can be SOURCED by any other script to get options in local variables
# SCRIPTOPTx and OPTARGx (if x designated as `x:` to request an argument)
# i.e. from parent script:
#    declare -A SCRIPTOPTS=( \
#       [s]="Save to backup loaction" \
#       [n:]="Copy resulting dtb to NFS boot folder, at designated location" \
#       ) 
#    `source ./0optParser.sh "$@"`

function printHelp {
    echo $1
    echo "Available options:"
    for K in "${!SCRIPTOPTS[@]}"; do 
        echo "   $(echo $K | sed 's/://g') - ${SCRIPTOPTS[$K]}"
    done
    exit -1
}

if [ ! ${SCRIPTOPTS[h]+_} ]; then SCRIPTOPTS[h]="Print help"; fi

# assign any opt .i.e. x defined above and provided in command line to variable i.e. SCRIPTOPTx
while getopts ":$(echo ${!SCRIPTOPTS[@]} | sed 's/ //g')" opt; do
    if [ "$opt" == "?" ]; then
        printHelp "Invalid option: -$OPTARG"
    elif [ "$opt" == ":" ]; then
        printHelp "Option -$OPTARG requires an argument."
    else
        if [ $OPTARG ]; then
            eval "OPTARG${opt}=$OPTARG"
            echo "Option ${opt} selected: ${SCRIPTOPTS[${opt}:]}"
        else
            echo "Option ${opt} selected: ${SCRIPTOPTS[$opt]}"
        fi
        eval "SCRIPTOPT${opt}=y"
    fi
done
if [ $SCRIPTOPTh ]; then printHelp; fi