setup.py

import os, re, sys
import subprocess
from pathlib import Path

from setuptools import Extension, setup
from setuptools.command.build_ext import build_ext


def read_version_from_pyproject(file_path):
    with open(file_path, 'r') as file:
        content = file.read()

    pattern = r'\bversion\s*=\s*"([^"]+)"'
    match = re.search(pattern, content)

    if match:
        version = match.group(1)
        return version
    else:
        return None


# Convert distutils Windows platform specifiers to CMake -A arguments
PLAT_TO_CMAKE = {
    "win32": "Win32",
    "win-amd64": "x64",
    "win-arm32": "ARM",
    "win-arm64": "ARM64",
}

class CMakeExtension(Extension):
    def __init__(self, name: str, sourcedir: str = "", cmake: str = "cmake") -> None:
        super().__init__(name, sources=[])
        self.sourcedir = os.fspath(Path(sourcedir).resolve())
        self.cmake = cmake


class CMakeBuild(build_ext):
    # Inspired from https://github.com/pybind/cmake_example/blob/master/setup.py
    def build_extension(self, ext: CMakeExtension) -> None:
        ext_fullpath = Path.cwd() / self.get_ext_fullpath(ext.name)
        extdir = ext_fullpath.parent.resolve()

        debug = int(os.environ.get("DEBUG", 0)) if self.debug is None else self.debug
        cfg = "Debug" if debug else "Release"

        # CMake lets you override the generator - we need to check this.
        # Can be set with Conda-Build, for example.
        cmake_generator = os.environ.get("CMAKE_GENERATOR", "")

        cmake_args = [
            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}{os.sep}",
            f"-DPYTHON_EXECUTABLE={sys.executable}",
            f"-DCMAKE_BUILD_TYPE={cfg}",
            '-DOPENSTL_BUILD_PYTHON:BOOL=ON'
        ]

        build_args = []
        # Adding CMake arguments set as environment variable
        # (needed e.g. to build for ARM OSx on conda-forge)
        if "CMAKE_ARGS" in os.environ:
            cmake_args += [item for item in os.environ["CMAKE_ARGS"].split(" ") if item]

        if self.compiler.compiler_type != "msvc":
            # Using Ninja-build since it a) is available as a wheel and b)
            # multithreads automatically. MSVC would require all variables be
            # exported for Ninja to pick it up, which is a little tricky to do.
            # Users can override the generator with CMAKE_GENERATOR in CMake
            # 3.15+.
            if not cmake_generator or cmake_generator == "Ninja":
                try:
                    import ninja

                    ninja_executable_path = Path(ninja.BIN_DIR) / "ninja"
                    cmake_args += [
                        "-GNinja",
                        f"-DCMAKE_MAKE_PROGRAM:FILEPATH={ninja_executable_path}",
                    ]
                except ImportError:
                    pass

        else:
            # Single config generators are handled "normally"
            single_config = any(x in cmake_generator for x in {"NMake", "Ninja"})

            # CMake allows an arch-in-generator style for backward compatibility
            contains_arch = any(x in cmake_generator for x in {"ARM", "Win64"})

            # Specify the arch if using MSVC generator, but only if it doesn't
            # contain a backward-compatibility arch spec already in the
            # generator name.
            if not single_config and not contains_arch:
                cmake_args += ["-A", PLAT_TO_CMAKE[self.plat_name]]

            # Multi-config generators have a different way to specify configs
            if not single_config:
                cmake_args += [
                    f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{cfg.upper()}={extdir}"
                ]
                build_args += ["--config", cfg]

        if sys.platform.startswith("darwin"):
            # Cross-compile support for macOS - respect ARCHFLAGS if set
            archs = re.findall(r"-arch (\S+)", os.environ.get("ARCHFLAGS", ""))
            if archs:
                cmake_args += ["-DCMAKE_OSX_ARCHITECTURES={}".format(";".join(archs))]

        # Set CMAKE_BUILD_PARALLEL_LEVEL to control the parallel build level
        # across all generators.
        if "CMAKE_BUILD_PARALLEL_LEVEL" not in os.environ:
            # self.parallel is a Python 3 only way to set parallel jobs by hand
            # using -j in the build_ext call, not supported by pip or PyPA-build.
            if hasattr(self, "parallel") and self.parallel:
                # CMake 3.12+ only.
                build_args += [f"-j{self.parallel}"]

        build_temp = Path(self.build_temp) / ext.name
        if not build_temp.exists():
            build_temp.mkdir(parents=True)

        subprocess.run([ext.cmake, ext.sourcedir] + cmake_args, cwd=build_temp, check=True)
        subprocess.run([ext.cmake, "--build", "."] + build_args, cwd=build_temp, check=True)

test_deps = [
    'coverage',
    'pytest',
    'numpy'
]

setup(
    name                    ="openstl",
    version                 =read_version_from_pyproject("pyproject.toml"),
    description             ="A simple STL serializer and deserializer",
    long_description        =open('README.md').read(),
    long_description_content_type='text/markdown',
    url                     ='https://github.com/Innoptech/OpenSTL',
    author                  ='Jean-Christophe Ruel',
    author_email            ='info@innoptech.com',
    python_requires         =">=3.4",
    ext_modules             =[CMakeExtension("openstl",
                                             sourcedir=os.environ.get('OPENSTL_SOURCE_DIR', '.'),
                                             cmake=os.environ.get('OPENSTL_CMAKE_PATH', 'cmake'))],
    cmdclass                ={'build_ext': CMakeBuild},
    test_suite              ="tests/python",
    tests_require           =test_deps,
    extras_require          ={'test': test_deps},
    include_package_data    =False,
    zip_safe                =False,
    classifiers=[
        "Development Status :: 5 - Production/Stable",
        "Intended Audience :: Developers",
        "Intended Audience :: Science/Research",
        "Topic :: Multimedia :: Graphics :: 3D Modeling",
        "Topic :: Scientific/Engineering :: Mathematics",
        "Topic :: Scientific/Engineering :: Visualization",
        "License :: OSI Approved :: BSD License",
        "Operating System :: OS Independent",
        "Operating System :: Microsoft :: Windows",
        "Operating System :: POSIX",
        "Operating System :: POSIX :: Linux",
        "Operating System :: MacOS",
        "Programming Language :: Python :: 3",
        "Programming Language :: Python :: 3.6",
        "Programming Language :: Python :: 3.7",
        "Programming Language :: Python :: 3.8",
        "Programming Language :: Python :: 3.9",
        "Programming Language :: Python :: 3.10",
        "Programming Language :: Python :: 3.11",
        "Programming Language :: Python :: 3.12"
    ],
)