Add new build file to build the cython extension and update

pyproject.toml to use it.

Run 'poetry install' to build and install rencode locally, then 'poetry
run pytest' to run tests.

Running 'poetry build' should build both sdist and wheel.

Author: aresch

build.py

@@ -0,0 +1,58 @@
+from __future__ import annotations
+
+import os
+import shutil
+
+from pathlib import Path
+
+from Cython.Build import cythonize
+from setuptools import Distribution
+from setuptools import Extension
+from setuptools.command.build_ext import build_ext
+
+
+COMPILE_ARGS = ["-march=native", "-O3", "-msse", "-msse2", "-mfma", "-mfpmath=sse"]
+LINK_ARGS: list[str] = []
+INCLUDE_DIRS: list[str] = []
+LIBRARIES: list[str] = []
+
+
+def build() -> None:
+    extensions = [
+        Extension(
+            "*",
+            ["rencode/*.pyx"],
+            extra_compile_args=COMPILE_ARGS,
+            extra_link_args=LINK_ARGS,
+            include_dirs=INCLUDE_DIRS,
+            libraries=LIBRARIES,
+        )
+    ]
+    ext_modules = cythonize(
+        extensions,
+        include_path=INCLUDE_DIRS,
+        compiler_directives={"binding": True, "language_level": 3},
+    )
+
+    distribution = Distribution({
+        "name": "rencode",
+        "ext_modules": ext_modules
+    })
+
+    cmd = build_ext(distribution)
+    cmd.ensure_finalized()
+    cmd.run()
+
+    # Copy built extensions back to the project
+    for output in cmd.get_outputs():
+        output = Path(output)
+        relative_extension = output.relative_to(cmd.build_lib)
+
+        shutil.copyfile(output, relative_extension)
+        mode = os.stat(relative_extension).st_mode
+        mode |= (mode & 0o444) >> 2
+        os.chmod(relative_extension, mode)
+
+
+if __name__ == "__main__":
+    build()

pyproject.toml

@@ -4,17 +4,29 @@ version = "1.0.7"
 description = "rencode is an object serialization library similar to bencode from the Bittorrent project."
 authors = ["Andrew Resch <andrewresch@gmail.com>"]
 license = "GPLv3"
+include = [{path = "rencode/*.so", format = "wheel"}, {path = "rencode/*.c", format = "sdist"}]
+packages = [{include = "rencode"}]
+exclude = ['rencode/*.c']
+
+[tool.poetry.build]
+script = "build.py"
 
 [tool.poetry.dependencies]
 python = "^3.9"
-Cython = ">=3"
+cython = ">=3"
 setuptools = "^80.4.0"
 
 [tool.poetry.group.dev.dependencies]
 black = "^21.9b0"
 cython = "^3.1.0"
 pytest = "^8.3.5"
 
+
+[tool.poetry.group.build.dependencies]
+setuptools = "^80.9.0"
+cython = "^3.1.1"
+poetry-core = "^2.1.3"
+
 [build-system]
-requires = ["setuptools>=42", "wheel", "Cython"]
-build-backend = "setuptools.build_meta"
+requires = ["poetry-core", "setuptools", "cython"]
+build-backend = "poetry.core.masonry.api"