setup.py

# -*- coding: utf-8 -*-
import os
import sys
import subprocess

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

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


# A CMakeExtension needs a sourcedir instead of a file list.
class CMakeExtension(Extension):
    def __init__(self, name, sourcedir=""):
        Extension.__init__(self, name, sources=[])
        self.sourcedir = os.path.abspath(sourcedir)


# Read requirements.txt
with open('requirements.txt', 'r') as f:
    lines = f.readlines()
install_requires = [line.strip() for line in lines if line]

# Read Version
with open('src/version.txt', 'r') as f:
    lines = f.readlines()
version = ".".join([line.split(' ')[1].strip() for line in lines if line])
print("The version is {}".format(version))

class CMakeBuild(build_ext):
    def run(self):
        # This is optional - will print a nicer error if CMake is missing.
        # Since we force CMake via PEP 518 in the pyproject.toml, this should
        # never happen and this whole method can be removed in your code if you
        # want.
        try:
            subprocess.check_output(["cmake", "--version"])
        except OSError:
            msg = "CMake missing - probably upgrade to a newer version of Pip?"
            raise RuntimeError(msg)

        # To support Python 2, we have to avoid super(), since distutils is all
        # old-style classes.
        build_ext.run(self)

    def build_extension(self, ext):
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))

        # required for auto-detection of auxiliary "native" libs
        if not extdir.endswith(os.path.sep):
            extdir += os.path.sep

        cfg = "Debug" if self.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", "")

        print(cfg)
        print(extdir)
        print(sys.executable)
        

        # Set Python_EXECUTABLE instead if you use PYBIND11_FINDPYTHON
        # EXAMPLE_VERSION_INFO shows you how to pass a value into the C++ code
        # from Python.
        cmake_args = [
            "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={}".format(extdir),
            "-DPYTHON_EXECUTABLE={}".format(sys.executable),
            "-DCMAKE_BUILD_TYPE={}".format(cfg),  # not used on MSVC, but no harm
        ]
        build_args = []

        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+.
            pass
            # if not cmake_generator:
            #     cmake_args += ["-GNinja"]

        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 += [
                    "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}".format(cfg.upper(), extdir)
                ]
                build_args += ["--config", cfg]

        # 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 += ["-j{}".format(self.parallel)]

        if not os.path.exists(self.build_temp):
            os.makedirs(self.build_temp)

        subprocess.check_call(
            ["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp
        )
        subprocess.check_call(
            ["cmake", "--build", ".", "--target",  "python-package"] + build_args, cwd=self.build_temp
        )


setup(
    name="cpplib",
    version=version,
    author="Jeremy Castagno",
    author_email="jeremybyu@gmail.com",
    description="Test CPPLib integration",
    url='https://github.com/JeremyBYU/cpp-pybind-skel',
    long_description=open('README.md').read(),
    long_description_content_type='text/markdown',
    license="MIT",
    include_package_data=True,
    packages=['cpplib'],
    package_dir={'':'src/Python'},
    ext_modules=[CMakeExtension("cpplib_pybind")],
    install_requires=install_requires,
    cmdclass={"build_ext": CMakeBuild},
    zip_safe=False,
)