[Render Jinja2 template from terminal] Renders a given Jinja2 template and saves it as a new file. #python #jinja2

render_jinja2.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This script renders a given Jinja2 template and saves it as a new file.
#
# Simon Schürg

import argparse
import os
from pathlib import Path
from jinja2 import Environment, FileSystemLoader

def setupArgparse():
    parser = argparse.ArgumentParser(description='Renders a given Jinja2 template and saves it as a new file.')
    parser.add_argument('template', metavar='TEMPLATE', help='Jinja2 template file path')
    parser.add_argument('output', metavar='OUTPUT', help='Output file path')
    parser.add_argument('vars', metavar='VARS', help='Variables to apply to the template (as <var>=<value>)', nargs='*')
    # parser.add_argument('-v', '--verbose', action='count', help='Verbose output')
    args = parser.parse_args()

    template_vars = {}
    for template_var in args.vars:
        key, value = template_var.strip().split("=")
        template_vars[key]=value
    return args, template_vars

def setupJinja2(args):
    if not Path(args.template).is_file():
        print("The given template {} is no file!".format(args.template))
        exit(1)
    template_dir = os.path.dirname(args.template)
    env = Environment(loader=FileSystemLoader(template_dir))
    return env

if __name__ == "__main__":
    args, template_vars = setupArgparse()
    env = setupJinja2(args)

    template = env.get_template(os.path.basename(args.template))
    parsed_template = template.render(**template_vars)

    print(parsed_template)
    with open(args.output, "w") as output_file:
        output_file.write(parsed_template)