templater.sh

#!/bin/bash
# 
#Copyright 2017 webmak10@gmail.com
#
#Permission is hereby granted, free of charge, to any person obtaining a copy of 
#this software and associated documentation files (the "Software"), to deal in 
#the Software without restriction, including without limitation the rights to 
#use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
#of the Software, and to permit persons to whom the Software is furnished to do 
#so, subject to the following conditions:
#
#The above copyright notice and this permission notice shall be included in all 
#copies or substantial portions of the Software.
#
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
#THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
#IN THE SOFTWARE.

function print_template {
    local context=$1;
    local -n template_vars=$2;
    local v
    for template_var in "${template_vars[@]}"
    do
        context="${context//\$\{$template_var\}/${!template_var}}"
    done;
    echo "$context";
}