MRE/scripts/render_templates.py

import os
import jinja2
import argparse

def render_template(template_file: str, 
                    out_path: str,
                    **kwargs) -> None:
    folder, file = os.path.split(template_file)
    template_path = os.path.abspath(folder)
    env = jinja2.Environment(loader=jinja2.FileSystemLoader(template_path),
                             trim_blocks=True,
                             lstrip_blocks=True)
    template = env.get_template(file)
    with open(out_path, 'w+') as save:
        save.write(template.render(**kwargs))


if __name__ == '__main__':
    parser = argparse.ArgumentParser(prog='render_templates.py',
                                     description='A script to render the docker jinja templates.',
                                     add_help=True)
    parser.add_argument('template_path',
                        help='The path to the template to render.')
    parser.add_argument('var_file_path',
                        help='The path to the file containing the variables to use for rendering the tempalte(s).')
    parser.add_argument('out_path',
                        help='The path to write the rendered template.')
    parser.add_argument('-k', 
                        '--kwargs',
                        required=False,
                        type=str,
                        default='',
                        help='Additional kwargs to include if needed (format: key1=value1,key2=value2...).')
    parser.add_argument('-o', 
                        '--overwrite',
                        action='store_true',
                        help='If set the previous template will be overwritten.')

    args = parser.parse_args()

    if not os.path.exists(args.template_path):
        print(f'The given template path {args.template_path} does not exist.')
        exit(1)
    
    if not os.path.exists(args.var_file_path):
        print(f'The given template path {args.var_file_path} does not exist.')
        exit(1)