Unable to use `uv` with Cookiecutter templates

[yakimka]

I have a Cookiecutter project template that I am trying to migrate from using Poetry to uv. However, I encountered an issue with the strict uv validation of pyproject.toml.

Poetry is able to read this pyproject.toml, handle dependencies, upgrade, etc. However, when I try to run the uv command, I get an error related to reading the config:

╰─ uv add mypy pre-commit
  Caused by: TOML parse error at line 6, column 8
  |
6 | name = "{{ cookiecutter.project_name }}"
  |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Not a valid package or extra name: "{{ cookiecutter.project_name }}". Names must start and end with a letter or digit and may only contain -, _, ., and alphanumeric characters.

Even when I replace {{ cookiecutter.project_name }} with a valid project name, I encounter an error while reading setup.cfg:

configparser.ParsingError: Source contains parsing errors: 'setup.cfg'
    [line 47]: '{% if cookiecutter.fastapi_support.startswith("y") %}\n'
    [line 50]: '{% endif %}\n'

Additionally, because of these errors, GitHub's Dependabot cannot process this pyproject.toml file.

Would it be possible for uv to implement a --no-validation flag that disables validation, allowing uv to be used with Cookiecutter templates?

[samypr100]

Unless I'm missing something, you'd have to render the cookiecutter first into an actual valid project using cookiecutter

e.g. uvx cookiecutter gh:audreyfeldroy/cookiecutter-pypackage

or in your case, something like uvx cookiecutter gh:yakimka/cookiecutter-pyproject

---

Or are you asking to allow uv to process (not validating) expressions like {{ cookiecutter.project_name }} and {% if cookiecutter.fastapi_support.startswith("y") %}?

What would the project name be in such case?

[yakimka]

@samypr100

you'd have to render the cookiecutter first into an actual valid project using

If I want to create a new project from the cookiecutter template, then yes, I need to render it first.

But for managing and updating dependencies of the template itself, I don't need to, and now it is working perfectly with Poetry. I can just navigate to cookiecutter-pyproject/{{cookiecutter.project_name}}, run poetry install, poetry update, or poetry add some-package, and it works perfectly fine because the pyproject.toml in my template is valid. For managing dependencies, Poetry doesn't need to validate the project name or load setup.cfg.