A tool to autogenerate text files.

autogen.py

import argparse, re, io 

template_pattern = re.compile("<%%(.*?)%%>")

def autogen(template, config):
  exec(config)
  loc = locals()
  def replace(match):
    nonlocal loc
    expression = match.group(1)
    return eval(expression, None, loc)
  return re.sub(template_pattern, replace, template)



parser = argparse.ArgumentParser(description='Autogeneration based on templates')
parser.add_argument('--input', metavar='I', type=str, nargs=1,
                   help='the template file to input')
parser.add_argument('--output', metavar='O', type=str, nargs=1,
                   help='the file to output')
parser.add_argument('--config', metavar='C', type=str, nargs=1,
                   help='any statements to be executed')
args = parser.parse_args()

input_file = open(args.input[0], 'r', newline='\n')
output_file = open(args.output[0], 'w', newline='\n')
output_file.writelines(map(lambda s: s + '\n', autogen(''.join(input_file.readlines()), args.config[0]).split('\n')))