simple python jinja2 template rendeer

render_template.py

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

def render_template(template_path: Path, output_path: Path, var_values: dict) -> None:
    """
    Render a Jinja2 template from a file and save it to the specified output path.

    Args:
        template_path (Path): The path of the input Jinja2 template file.
        output_path (Path): The path where the rendered template will be saved.
        var_values (dict): A dictionary containing variable values.

    Returns:
        None
    """

    # Check if the template file exists
    if not template_path.exists():
        print(f"Error: Template file '{template_path}' does not exist.")
        sys.exit(1)

    try:
        # Create a Jinja2 environment with a loader for our templates
        env = Environment(loader=FileSystemLoader(template_path.parent))

        # Load the template from the input file
        template = env.get_template(template_path.name)

        # Render the template and save it to the output path
        with open(output_path, 'w') as f:
            f.write(template.render(**var_values))
    except Exception as e:
        print(f"Error rendering template: {e}")
        sys.exit(1)

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Render a Jinja2 template from a file.")

    parser.add_argument("--input", "-i", help="The path of the input Jinja2 template file.", required=True)
    parser.add_argument("--output", "-o", help="The path where the rendered template will be saved.", required=True)
    parser.add_argument("--vars", "-v", help="A YAML file containing variable values.", required=True)

    args = parser.parse_args()

    try:
        with open(args.vars, 'r') as f:
            var_values = yaml.safe_load(f)
    except yaml.YAMLError as e:
        print(f"Error loading YAML variables: {e}")
        sys.exit(1)

    render_template(Path(args.input), Path(args.output), var_values)