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render_template.py
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render_template.py
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#!/usr/bin/env python3
import ast
import base64
import sys
import jinja2
from dotenv import dotenv_values
def b64encode(s: str) -> str:
return base64.b64encode(s.encode('utf-8')).decode('utf-8')
def main():
if len(sys.argv) < 2:
sys.exit('fatal error: no template file')
env = dotenv_values('.env')
tmpl_loader = jinja2.FileSystemLoader('.')
tmpl_env = jinja2.Environment(loader=tmpl_loader, autoescape=True)
tmpl_env.filters['b64encode'] = b64encode
tmpl = tmpl_env.get_template(sys.argv[1])
tmpl_vars = {}
for name, val in env.items():
if name.endswith('[]'):
name = name[:-2]
try:
val = ast.literal_eval(val)
if not isinstance(val, list):
raise ValueError('not a list')
except (SyntaxError, ValueError):
sys.exit(f'fatal error: the variable {name} must be a list literal')
name = name.lower()
tmpl_vars[name] = val
print(tmpl.render(**tmpl_vars))
if __name__ == '__main__':
main()