TODO: build a key=value parameter processing library similar to python's for shell scripts

sample.sh

# base on this args processing model

 for a in "$@"; do
     case $a in
         --path | -P)
             shift 1
             EMACS="$1"
             shift 1
             ;;
         --toolbars | -B)
             shift 1
             TOOLBARS=1
             ;;
         --load-packages)
             shift 1
             LOAD_PACKAGES="$1"
             shift 1
             ;;
         -h)
             usage
             exit 1
             ;;
     esac
 done