Added support for dotenv files

Optimized code

renderTemplate.py

@@ -4,23 +4,27 @@ import json
 import os
 import socket
 import sys
+
+import dotenv
 import toml
 import yaml
-from jinja2 import Environment, Template, TemplateError, pass_eval_context
+from jinja2 import Environment, TemplateError
 import argparse
 
-
 argsparser = argparse.ArgumentParser(description='Jinja Template Helper')
 
 infilegroup = argsparser.add_mutually_exclusive_group(required=False)
 infilegroup.add_argument('--yaml', dest='yaml_file', type=str, required=False,
-                        help='YAML file path')
+                         help='YAML file path')
 infilegroup.add_argument('--json', dest='json_file', type=str, required=False,
-                        help='JSON file path')
+                         help='JSON file path')
 infilegroup.add_argument('--toml', dest='toml_file', type=str, required=False,
-                        help='TOML file path')
+                         help='TOML file path')
 infilegroup.add_argument('--ini', dest='ini_file', type=str, required=False,
-                        help='INI fil path')
+                         help='INI fil path')
+
+argsparser.add_argument('--env', dest='env_file', type=bool, required=False, default=False,
+                        help='Load .env file from current directory')
 
 argsparser.add_argument('--output', default='/dev/stdout',
                         help='Output File')
@@ -40,6 +44,7 @@ jenv = Environment(autoescape=True,
                    keep_trailing_newline=True,
                    optimized=True)
 
+
 # Jinja Filters
 # -------------
 def filter_env(name, defvalue=""):
@@ -116,7 +121,7 @@ def load_json_file(filename):
             try:
                 return json.load(instream)
             except json.JSONDecodeError as exc:
-                print_error("JSON error: [", exc.lineno ,"," ,exc.colno, "]", exc.msg)
+                print_error("JSON error: [", exc.lineno, ",", exc.colno, "]", exc.msg)
     else:
         print_error("ERROR:", filename, "- File not found")
 
@@ -144,6 +149,7 @@ def render_template(template, outfile, variables=None):
     except TemplateError as exc:
         print_error("Rendering Error:", exc.message)
 
+
 if __name__ == '__main__':
     # Read command line arguments
     args = argsparser.parse_args()
@@ -153,6 +159,8 @@ if __name__ == '__main__':
 
     # If template was found
     if tpl:
+        if args.env_file:
+            dotenv.load_dotenv(dotenv.find_dotenv(raise_error_if_not_found=False))
         # Load content from file, if present
         if args.yaml_file:
             content = load_yaml_file(args.yaml_file)

requirements.txt

@@ -1,3 +1,4 @@
 toml>=0.10.2
 PyYAML>=5.4.1
 Jinja2>=3.0.1
+python-dotenv>=0.18.0