#!/usr/bin/env bash

#-------------------------------------------------------------------------------
# Example 6 for Bash Tips show 21: a poor way to make a configuration file
#-------------------------------------------------------------------------------

#
# Example configuration file using 'export'
#
CFG1='bash21_ex6_1.cfg'
if [[ ! -e $CFG1 ]]; then
    echo "Unable to find $CFG1"
    exit 1
fi

#
# Alternative configuration file using 'declare', converted from the other one
#
CFG2='bash21_ex6_2.cfg'

#
# Strip out all of the 'export' commands with 'sed' in a process substitution,
# turning the lines into simple variable declarations. Use 'source' to obey
# all of the resulting commands
#
source <(sed 's/^export //' $CFG1)

#
# Scan the (simple) variables beginning with '_CFG_' and convert them into
# a portable form by saving the output of 'declare -p'
#
declare -p "${!_CFG_@}" > $CFG2

#
# Now next time we can 'source' this file instead when we want the variables
#
cat $CFG2

exit