setup.py

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

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


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):
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.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":
            cmake_args += [
                "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}".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()
        env["CXXFLAGS"] = '{} -DVERSION_INFO=\\"{}\\"'.format(
            env.get("CXXFLAGS", ""), self.distribution.get_version()
        )
        if not os.path.exists(self.build_temp):
            os.makedirs(self.build_temp)

        precision = os.environ.get("MUMAXPLUS_FP_PRECISION")
        aliases = {"SINGLE": ("SINGLE", "1", "32"), "DOUBLE": ("DOUBLE", "2", "64")}
        precisions = (
            [k for k, v in aliases.items() if precision in v]
            if precision
            else aliases.keys()
        )
        for precision in precisions:
            build_temp = Path(self.build_temp) / precision.lower()
            build_temp.mkdir(parents=True, exist_ok=True)
            cmake_precision_args = [
                f"-DMUMAX_MODULE_NAME=_mumaxpluscpp_{precision.lower()}",
                f"-DFP_PRECISION={precision}",
            ]

            subprocess.check_call(
                ["cmake", ext.sourcedir] + cmake_args + cmake_precision_args,
                cwd=build_temp,
                env=env,
            )
            subprocess.check_call(
                [
                    "cmake",
                    "--build",
                    ".",
                    "--target",
                    f"_mumaxpluscpp_{precision.lower()}",
                    "install",
                ]
                + build_args,
                cwd=build_temp,
            )


def _install_precommit_hook():
    """Best-effort install of the pre-commit git hook after setup."""
    env = os.environ.copy()
    # Remove pip build-isolation leftovers so the pre-commit
    # subprocess can see the real environment's site-packages.
    env.pop("PYTHONPATH", None)
    env.pop("PYTHONNOUSERSITE", None)

    try:
        subprocess.run(
            [
                "pre-commit",
                "install",
                "--hook-type",
                "pre-commit",
            ],
            check=True,
            env=env,
        )
    except FileNotFoundError:
        print(
            "Note: 'pre-commit' executable not found; skipping git hook install. "
            "Make sure your conda env is active and includes pre-commit."
        )
    except subprocess.CalledProcessError:
        print("Warning: 'pre-commit install' failed; hook was not installed.")


class DevelopWithPreCommit(develop):
    def run(self):
        develop.run(self)
        _install_precommit_hook()


class InstallWithPreCommit(install):
    def run(self):
        install.run(self)
        _install_precommit_hook()


setup(
    long_description="",
    packages=find_packages(include=["mumaxplus", "mumaxplus.*"]),
    ext_modules=[
        CMakeExtension("_mumaxpluscpp_single"),
        CMakeExtension("_mumaxpluscpp_double"),
    ],
    cmdclass=dict(
        build_ext=CMakeBuild,
        install=InstallWithPreCommit,
        develop=DevelopWithPreCommit,
    ),
    zip_safe=False,
)