Trying pyproject.toml and scikit-build-core

[ajfriend]

Trying for a PEP 621 compatible setup using pyproject.toml instead of setup.py. Also trying to use scikit-build-core.

• https://learn.scientific-python.org/development/guides/packaging-compiled/
• https://scikit-build-core.readthedocs.io/en/latest/getting_started.html#cmake-file (Cython instructions)

[ajfriend]

Currently running into an issue:

  CMake Error at src/h3/_cy/CMakeLists.txt:1 (find_package):
    No "FindCython.cmake" found in CMAKE_MODULE_PATH.


  CMake Warning (dev) at src/h3/_cy/CMakeLists.txt:1 (find_package):
    FindCython.cmake must either be part of this project itself, in this case
    adjust CMAKE_MODULE_PATH so that it points to the correct location inside
    its source tree.

    Or it must be installed by a package which has already been found via
    find_package().  In this case make sure that package has indeed been found
    and adjust CMAKE_MODULE_PATH to contain the location where that package has
    installed FindCython.cmake.  This must be a location provided by that
    package.  This error in general means that the buildsystem of this project
    is relying on a Find-module without ensuring that it is actually available.

Based on the comment "You’ll need to handle the generation of files by Cython directly at the moment. A helper (similar to scikit-build classic) might be added in the future." in https://scikit-build-core.readthedocs.io/en/latest/getting_started.html#cmake-file, I'm wondering if this is something from scikit-build classic that we need to remove and just do manually?

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.33%. Comparing base (cec946a) to head (121314a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/test_cython/test_cython.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #378      +/-   ##
===========================================
- Coverage   100.00%   99.33%   -0.67%     
===========================================
  Files           10       28      +18     
  Lines          343     1346    +1003     
===========================================
+ Hits           343     1337     +994     
- Misses           0        9       +9     

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[ajfriend]

Tests are running fine, but we need to figure out how to build the annotations again: https://github.com/scikit-build/cython-cmake/blob/main/src/cython_cmake/cmake/UseCython.cmake#L201-L202

I've tried just dropping in an --annotate in the CMakeLists.txt but that doesn't seem to be working.

[ajfriend]

TODO: We were previously excluding unnecessary files in the sdist with MANIFEST.in. Those files are now being included, so we need to recover that functionality with this setup.

[ajfriend]

Coverage decreased because I added the test files themselves to be included in the coverage report.

[ajfriend]

Coverage decreased because I added the test files themselves to be included in the coverage report.

And a good thing too, because it caught a bug!

Our Cython example is no longer working:

❯ env/bin/cythonize -i tests/test_cython/cython_example.pyx
/Users/aj/work/h3-py/tests/test_cython/cython_example.c:22015:13: warning: code will never be executed [-Wunreachable-code]
            goto bad;
            ^~~~~~~~
1 warning generated.
ld: warning: duplicate -rpath '/Users/aj/.pyenv/versions/3.12.3/lib' ignored
ld: warning: duplicate -rpath '/opt/homebrew/lib' ignored
error: could not create 'src/tests/test_cython/cython_example.cpython-312-darwin.so': No such file or directory

[isaacbrodsky]

does this need to be limited to numpy<2?

[ajfriend]

Nope! Dropped it.

[ajfriend]

Everything should work, except for #396

I think we should merge this change to master and fix the issue from there.