#!/bin/bash
# Demo of using getopts to pass array as argument to bash script
# Copyright (C) 2023 - F-Hauri.ch
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.

usage() {
    cat <<-EoUsage
	Usage: $0 [-a arg] [-aarg] [-A Fld=val] [-I Fld=int] ...
	    [-A field+=Value]    # Will concatenate value to field,
	    [-I field+=Integer]  # Will add integer to field.
EoUsage
}
die() { echo >&2 "ERROR ${@}";exit 1;}
isIntOrDie() { case ${1#[-+]} in ''|*[!0-9]*) die "'$1' in not integer";;esac;}
parseAArg(){
    local fld=${OPTARG%%=*} val integer=0
    [[ $1 == -i ]] && integer=1 && shift
    local -n aarray=$1
    [[ -z $fld ]] && { # Field name begin by =
	fld=${OPTARG#=}
	fld==${fld%%=*}
    }
    (( ${#fld} > 1 )) && fld=${fld%+} # If field name is not [+]
    (( ${#fld} < 1 )) && return 1;
    val=${OPTARG#$fld}
    case $val in
	+=* )
	    ((integer)) && isIntOrDie "${val#+=}"
	    aarray["$fld"]+="${val#+=}";;
	=*|'' )
	    ((integer)) && isIntOrDie "${val#=}"
	    aarray["$fld"]="${val#=}";;
	* ) echo PARSING ERROR; declare -p OPTARG fld val;;
    esac
}
Array=()
declare -A AArray='()'
declare -Ai iAArray='()'
while getopts "ha:A:I:" opt; do
    case $opt in
        h ) usage; exit ;;
        a ) Array+=("$OPTARG") ;;
	A ) parseAArg AArray ;;
	I ) parseAArg iAArray ;;
        ... ) : Some other flags if needed;;
        * ) echo Wrong argument.;exit 1 ;;
    esac
done
shift $((OPTIND-1))

printf 'You now have four arrays: $@ (%d), $%s (%d) , $%s (%d) and $%s (%d)\n' \
       $# Array ${#Array[@]} AArray ${#AArray[@]} iAArray ${#iAArray[@]}
echo "${*@A}"
declare -p {,{,i}A}Array