flags.sh

#!/bin/bash
declare -A variables2=()
declare prev_var=''

showHelp()
{
    echo "Basic help"
    echo "----------"
    for i in "${!setupVars[@]}"; do
        echo "${i}"
    done

    echo "--help|-h show this help"
}

for i in "$@"; do
    parameter=$(echo ${i} | grep -E '^\-{1,2}[a-zA-Z0-9]+$')
    if [[ ${parameter} == "--help" || ${parameter} == "-h" ]]; then
        showHelp
        exit 0
    elif [[ ${parameter} != "" && ${setupVars[$i]} ]]; then
        variables2[$i]=""
        prev_var=${i}
        declare ${setupVars[$i]}=""
    elif [[ ${parameter} != "" ]]; then
        echo ${parameter} is not available and will be ignored.
    elif [[ ${prev_var} == "" ]]; then
        echo "${parameter} $i cannot be set to variable and will be ignored (you can use it as \$1)."
    else
        variables2[$prev_var]="${variables2[$prev_var]} ${i}"
        declare ${setupVars[${prev_var}]}="${variables2[$prev_var]}"
    fi
done

usage.sh

#!/bin/bash

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )";

declare -A setupVars=()

setupVars["--src"]="sources"
setupVars["--fix"]="fix"

source ${SCRIPT_DIR}/../bin/scripts/includes/flags.sh

echo sources: ${sources}
echo fix: ${fix}