import re
import sys
import subprocess

if len(sys.argv) <= 1:
    print('Usage: pgp-sign.py [files]')
    exit(1)

for file_ in sys.argv[1:]:
    print(f'Signing {file_} ...')
    with open(file_, 'r') as fh:
        content = fh.read()
    #content = re.sub(r'^\s*<!doctype[^>]*>', '', content)
    proc = subprocess.run(['gpg',
                                '--armor',
                                '--detach-sign',
                                '--output', '-',
                                '--local-user', 'papatutuwawa@polynom.me',
                                file_],
                          capture_output=True,
                          check=True,
                          input=content,
                          encoding='utf-8')
    signature = proc.stdout[:-1]
    with open(file_, 'r') as fh:
        content = fh.read().replace('%%%SIGNED_PAGES_PGP_SIGNATURE%%%', signature)
    with open(file_, 'w') as fh:
        fh.write(content)