argv-export.sh

#!/bin/bash

#
# Export variables based on getopt long options
# Example usage: sample.sh
#

# parse options
LONG_OPTIONS=$(IFS=, echo "${ARGV_EXPORT_OPTIONS[@]}")
GETOPT="getopt"
[[ ! -z $ARGV_QUIET ]] && GETOPT="$GETOPT -q"
ARGV=$($GETOPT -o "" -l "$LONG_OPTIONS" -n 'options' -- "$@")
eval set -- "$ARGV"

# declare argv options as variable under prefix
while true; do
  case "$1" in
    -- )
      shift
      break
    ;;
    --* )
      # current option name without --
      CURRENT=${1:2}

      # proper variable name
      VARNAME=${CURRENT^^}    # uppercase
      VARNAME=${VARNAME//-/_}  # - to _
      VARNAME=${ARGV_EXPORT_PREFIX}${VARNAME}

      # check if option is a key=value or boolean
      case "${ARGV_EXPORT_OPTIONS[@]}" in
        # key=value
        *"${CURRENT}:"* )
          if [ ! -z "$VARNAME" ]; then
            REF="${VARNAME}[@]"
            declare -a "$VARNAME"='(${!REF} $2)'
          else
            export ${VARNAME}=$2
          fi
          shift
        ;;
        # boolean
        *"${CURRENT}"* )
          export ${VARNAME}=1
        ;;
      esac
    ;;
    * )
      break
  esac
  shift
done

sample.sh

#!/bin/bash

# ./sample.sh --username foo --password bar --option-flag --list abc --list def --list geh

MY_OPTIONS=(
  "username:"
  "password:"
  "option-flag"
  "list:"
)

ARGV_EXPORT_OPTIONS=${MY_OPTIONS[@]} \
ARGV_EXPORT_PREFIX="MY_" \
. argv-export.sh $@

echo "username: $MY_USERNAME"
echo "password: $MY_PASSWORD"
echo "option-flag: $MY_OPTION_FLAG"
for i in ${MY_LIST[@]}; do
  echo "item: $i"
done