Code formatting comes to uv experimentally

I'd rather `ruff` being merged with `ty` instead. `uv` for me is about package / project manager. It's not about code style. The only time `uv` should edit a code file is to update its dependencies (PEP 723).

On the other hand, both `ruff` and `ty` are about code style. They both edit the code, either to format or fix typing / lint issues. They are good candidates to be merged.

To clarify, `ruff` and `uv` aren't being merged. They remain separate tools. This is more about providing a simpler experience for users that don't want to think about their formatter as a separate tool.

The analogy would be to Cargo: `cargo fmt` just runs `rustfmt`, but you can also run `rustfmt` separately if you want.

Isn’t there `uv tool run ruff` already for this? Or `uv run ruff` if it’s a proper dependency? I’m not sure what’s the point of a special shortcut command, unless there are plans to make it flexible so it’ll be an abstraction over formatters (unifying ruff, black, etc).

Yeah, you can definitely use `uvx ruff` (an alias for `uv tool run ruff`) to invoke Ruff. That's what I've done in my own projects historically.

The goal here is to see if users like a more streamlined experience with an opinionated default, like you have in Rust or Go: install uv, use `uv init` to create a project, use `uv run` to run your code, `uv format` to format it, etc. Maybe they won't like it! TBD.

(Ruff is installed when you invoke `uv format`, rather than bundled with the uv binary, so if you never use `uv format`, there aren't any material downsides to the experiment.)