Automatic detection of implicit namespace packages (PEP420) following src/ layout

[karlicoss]

Many of my packages are implicit namespace packages, so I don't have __init__.py at all.

Seems like currently according to docs, hatch requires either __init__.py or <NAME>.py.

However from modern python's perspective, src/<NAME>/... is a perfectly good python package!

Setuptools is able to build such a package without any extra configuration (at least when using pyproject.toml)

Hatch results in

ValueError: Unable to determine which files to ship inside the wheel using the following heuristics:
      https://hatch.pypa.io/latest/plugins/builder/wheel/#default-file-selection

      The most likely cause of this is that there is no directory that matches the name of your project

, unless we specify (as this message helpfully suggests)

      [tool.hatch.build.targets.wheel]
      packages = ["src/foo"]

This works, but it's an extra section of config where project name needs to be duplicated.
I wonder if it's possible to detect package in src/<NAME> automatically?

Setuptools can do that, is there a good reason hatch can't? :) Thanks!

Related issues: #587 #1646