Allow Custom Version Scheme Outside setup.py (resolves #781)

[schang412]

Currently, there is no way to specify a custom version_scheme if you are not using setup.py. When provided a string that does not match the name of a valid entrypoint, the main version is assigned None and fails the assert.

This patch provides a method to specify a qualified name for a function using the same syntax as an console script entrypoint:

[tool.setuptools_scm]
version_scheme = "my_module.my_file:my_custom_version_scheme_func"
local_scheme = "my_module.my_file:my_custom_local_scheme_func"

In order to accomplish this, when going through the available version schemes, if no version scheme is found, it treats the string as a qualified function name, and tries to load it using importlib.metadata.EntryPoint. If this does not lead to a valid function, it will maintain current behavior.

[RonnyPfannschmidt]

Thanks for having a look at this

I'll have to investigate how that would integrate with the delayed simplify_types branch

[schang412]

Looking at the branch in your fork, it seems like the changes just need to be moved to a different file. If you'd like, after merging simplify_types, I can update my PR to reflect the changes necessary.

[RonnyPfannschmidt]

I'll enable that

I intend to completely change how version schemes work, so people can pick and choose them with extra configuration instead of dropping into functions most of the time

[RonnyPfannschmidt]

its merged, please have a look

[schang412]

Hi, I updated my branch. Please let me know if there’s any issues or anything I should change.

[RonnyPfannschmidt]

One item that's missing is a unit or acceptance test for the behaviour

[schang412]

Sure, I can make one. Is testing/test_config.py the most appropriate place?

[RonnyPfannschmidt]

Most likely for now

[RonnyPfannschmidt]

we should pick a non-default version scheme and check that it is actually used

[schang412]

Hi, I updated it to use a non-default version scheme, and merged the latest main branch in but some tests are failing for windows now. I'm not sure why. Curiously, one of the Windows tests passed.

[RonnyPfannschmidt]

Thanks