render_template

#!/bin/bash

## This is a simple templating script based and bash/sed.
#  Each templates should start with #!/sbin/render_template <dest>.
#  The rendered will be save at <dest>.
#  The values are provided via environment variables just like normal shell script.
#  Those names in double curly braces will be replaced with corresponding value while the likes of $name, $path will left untouched.
#  This rule is for escaping $host, $scheme in nginx config files.
#  As the templates can be used as normal script, it is better to be placed in your my_init.d file or the like.
#
#  MIT LICENSE by Wen Li Copyright 2015

function print_usage {
  echo "Usage: $(basename $0) [-e <env.sh>] <dst> <template>"
}

echo "$@"

if [ $# -lt 1 ]; then
  print_usage
  exit 1
fi

# Ensure the dir is available
mkdir -p $(dirname "$file")

_cmd__asdf="echo -e \"$(cat $template | sed -e 's/\$\(\w\+\)/\\$\1/' -e 's/{{\(\w\+\)}}/${\1}/' | tail -n+2 )\" > $file "

if [ -f "${env_script:-}" ]; then
  source "${env_script}"
fi

# Processing the template and generate the file to the given path
eval "echo -e \"$(cat $2 | sed -e 's/\$\(\w\+\)/\\$\1/g' -e 's/{{\(\w\+\)}}/${\1}/g' | tail -n+2 )\" > $1 "