setup.py

# Notice:
# This `setup.py` file is adapted from
# <https://github.com/pybind/cmake_example>.

import os
import re
import sys
import platform
import subprocess
from distutils.version import LooseVersion

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


class CMakeExtension(Extension):
    def __init__(self, name, sourcedir=''):
        Extension.__init__(self, name, sources=[])
        self.sourcedir = os.path.abspath(sourcedir)


class CMakeBuild(build_ext):
    def run(self):
        try:
            out = subprocess.check_output(['cmake', '--version'])
        except OSError:
            raise RuntimeError("CMake must be installed to build the following"
                               " extensions: "
                               + ", ".join(e.name for e in self.extensions))

        if platform.system() == "Windows":
            cmake_version = LooseVersion(re.search(r'version\s*([\d.]+)',
                                         out.decode()).group(1))
            if cmake_version < '3.1.0':
                raise RuntimeError("CMake >= 3.1.0 is required on Windows")

        for ext in self.extensions:
            self.build_extension(ext)

    def build_extension(self, ext):
        directory_name = os.path.dirname(self.get_ext_fullpath(ext.name))
        extdir = os.path.abspath(directory_name)
        cmake_args = ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=' + extdir,
                      '-DPYTHON_EXECUTABLE=' + sys.executable]

        cfg = 'Debug' if self.debug else 'Release'
        build_args = ['--config', cfg]

        if platform.system() == "Windows":
            string = '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}'
            cmake_args += [string.format(cfg.upper(), extdir)]
            if sys.maxsize > 2**32:
                cmake_args += ['-A', 'x64']
            build_args += ['--', '/m']
        else:
            cmake_args += ['-DCMAKE_BUILD_TYPE=' + cfg]
            build_args += ['--', '-j2']

        env = os.environ.copy()
        string = '{} -DVERSION_INFO=\\"{}\\"'
        env['CXXFLAGS'] = string.format(env.get('CXXFLAGS', ''),
                                        self.distribution.get_version())
        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, env=env)
        subprocess.check_call(['cmake', '--build', '.'] + build_args,
                              cwd=self.build_temp)


with open('README.md') as readme:
    long_description = readme.read()

setup(
    name='khuri',
    version='0.0.1',
    author='Malwin Niehus',
    author_email='niehus@hiskp.uni-bonn.de',
    description='Khuri-Treiman equations / dispersion relations',
    long_description=long_description,
    license='GPL 3',
    python_requires='>=3.7.1',
    packages=find_packages(),
    ext_modules=[CMakeExtension('khuri')],
    cmdclass=dict(build_ext=CMakeBuild),
    zip_safe=False,
)