fix sdist build error ValueError: 'chgnet/graph/cygraph.pyx' doesn't …

…match any files

  File "/tmp/build-env-d_rbfy8m/lib/python3.10/site-packages/Cython/Build/Dependencies.py", line 119, in nonempty
    raise ValueError(error_msg)
ValueError: 'chgnet/graph/cygraph.pyx' doesn't match any files

ERROR Backend subprocess exited when trying to invoke get_requires_for_build_wheel

.github/workflows/test.yml

@@ -36,6 +36,8 @@ jobs:
 
  - name: Install dependencies
  run: |
+ pip install cython
+ python setup.py build_ext --inplace
  pip install -e .[test]
 
  - name: Run Tests

setup.py

@@ -1,10 +1,22 @@
 from __future__ import annotations
 
-from Cython.Build import cythonize
 from setuptools import Extension, setup
+from setuptools.command.build_ext import build_ext
 
-extensions = cythonize(
- [Extension("chgnet.graph.cygraph", ["chgnet/graph/cygraph.pyx"])]
-)
 
-setup(ext_modules=extensions)
+class BuildExt(build_ext):
+ """Custom build extension."""
+
+ def finalize_options(self):
+ """Override finalize_options to ensure we don't run cythonize when making
+ a source distribution.
+ """
+ import Cython.Build
+
+ self.distribution.ext_modules = Cython.Build.cythonize(
+ [Extension("chgnet.graph.cygraph", ["chgnet/graph/cygraph.pyx"])]
+ )
+ super().finalize_options()
+
+
+setup(cmdclass={"build_ext": BuildExt})