Use uv's build backend instead of hatch?

[rsyring]

I originally chose hatch as a build backend because it got us away from MANIFEST.IN, it's VCS based file inclusion generally "just worked", and, specifically, let us install from text files generated by pip-compile.

We don't need the text files support anymore and @bchopson let us know that uv's build backend will become the default for uv init as of 0.7.19. We could start using their backend instead of hatch.

I see two issues with that approach:

• Hatch's source distribution build starts with all files in source control. So, in general, there is no need to specify what files are included. uv's build backend basically only takes the python module and everything else must be included.
• Our bump task is dependent on hatch-regex-commit

[rsyring]

We currently only use hatch in the bump task for it's hatch version capabilities. But, we could easily script those into the bump script (which some projects don't need or want anyway). That would get rid of needing both hatch and uv in the dev venv.

Alternatively, we could get rid of the version-in-a-file pattern and just use something like https://pypi.org/project/versioningit/ which will take it's version from a git tag. So, the only thing to do is git tag then build.

Flit seems to support all the workflows I want from a build tool (read version from a file, use vcs for file inclusion in the pacakge, sane defaults): https://flit.pypa.io/en/stable/index.html. If we went that direction, then the bump would just need to set the version and tag with git.

Could also consider a dedicated version bump tool. Options at: https://github.com/c4urself/bump2version/blob/master/RELATED.md

[rsyring]

There is currently a bug of some type of with hatch version keeping me from bumping the version on a project. pypa/hatch#2118

I pinned hatch to <1.16 in pyproject.toml and updated uv.lock to hatch==1.15.1.

Status
A quick hatch version check still fails, but now with a different upstream Hatch issue:

Environment 'default' is incompatible: module 'virtualenv.discovery.builtin' has no attribute 'propose_interpreters'
That matches pypa/hatch#2193: Hatch versions before the fix are incompatible with virtualenv>=21, and your lock currently has virtualenv==21.3.3.

😡