fix the result of uv export to add extra index urls

fixup_requirements.py

"""
Append --extra-index-url statements in requirements.txt (not supported by uv export)
https://github.com/astral-sh/uv/issues/7496

run from pre-commit with
```yaml
  -   repo: local
      hooks:
      - id: fix-requirements
        name: fix extra-index-urls in generated requirements.txt
        language: system
        entry: python fix_requirements.py
        files: ^requirements.*\.txt$
```
"""
import os
import sys
from pathlib import Path

EXTRA_URLS = [
    "https://gitlab.example.org/api/v4/projects/526/packages/pypi/simple"
]

if __name__ == '__main__':
    path = Path(sys.argv[1] if len(sys.argv) >= 2 else 'requirements.txt')
    lines = path.read_text().splitlines()
    with path.open("a") as f:
        for missing_url in EXTRA_URLS:
          if not any(missing_url in line for line in lines):
            f.write(f'--extra-index-url {missing_url}{os.linesep}')