refactor: add extension_kwargs kwargs and nitpicky stuff

.pre-commit-config.yaml

@@ -25,3 +25,6 @@ repos:
     rev: v1.13.0
     hooks:
       - id: mypy
+        additional_dependencies:
+          - cython
+          - setuptools

pyproject.toml

@@ -1,31 +1,24 @@
 [build-system]
+requires = ["setuptools", "setuptools-scm"]
 build-backend = "setuptools.build_meta"
-requires = ["setuptools", "wheel"]
 
 [project]
 name = "witty"
 description = "Well-in-Time Compiler for Cython Modules"
 readme = "README.md"
 requires-python = ">=3.9"
-classifiers = [
-  "Programming Language :: Python :: 3",
-]
+classifiers = ["Programming Language :: Python :: 3"]
 keywords = []
 license = { text = "BSD 3-Clause License" }
 authors = [
-    { email = "[email protected]", name = "Jan Funke" },
+  { email = "[email protected]", name = "Jan Funke" },
+  { email = "[email protected]", name = "Talley Lambert" },
 ]
 dynamic = ["version"]
 dependencies = ["cython", "setuptools; python_version >= '3.12'"]
 
 [project.optional-dependencies]
-dev = [
-  'pytest',
-  'ruff',
-  'mypy',
-  'pdoc',
-  'pre-commit'
-]
+dev = ['pytest', 'ruff', 'mypy', 'pdoc', 'pre-commit']
 
 [project.urls]
 homepage = "https://github.com/funkelab/witty"
@@ -34,3 +27,24 @@ repository = "https://github.com/funkelab/witty"
 [tool.ruff]
 target-version = "py39"
 src = ["src"]
+
+[tool.ruff.lint]
+select = [
+  "E",  # style errors
+  "F",  # flakes
+  "W",  # warnings
+  "I",  # isort
+  "UP", # pyupgrade
+]
+
+[tool.mypy]
+files = "src/**/*.py"
+strict = true
+disallow_any_generics = false
+disallow_subclassing_any = false
+show_error_codes = true
+pretty = true
+
+[[tool.mypy.overrides]]
+module = ["tests.*"]
+disallow_untyped_defs = false

src/witty/__init__.py

@@ -1,5 +1,11 @@
-from .compile_module import compile_module
+from importlib.metadata import PackageNotFoundError, version
+
+try:
+    __version__ = version("witty")
+except PackageNotFoundError:
+    # package is not installed
+    __version__ = "unknown"
 
-__version__ = "0.1"
+from .compile_module import compile_module
 
 __all__ = ["compile_module"]

src/witty/compile_module.py

@@ -1,101 +1,86 @@
-import os
-import Cython
+from __future__ import annotations
+
 import hashlib
 import importlib.util
+import json
+import os
 import sys
-from Cython.Build import cythonize
-from Cython.Build.Inline import to_unicode, _get_build_extension
-from Cython.Utils import get_cython_cache_dir
+from contextlib import contextmanager
 from pathlib import Path
+from typing import TYPE_CHECKING, Any, Literal
 
-try:
-    from distutils.core import Extension
-except ImportError:
-    from setuptools import Extension  # type: ignore [no-redef]
-
+import Cython
+from Cython.Build import cythonize
+from Cython.Build.Inline import build_ext
+from Cython.Utils import get_cython_cache_dir
+from setuptools import Distribution, Extension
 
-def load_dynamic(module_name, module_lib):
-    spec = importlib.util.spec_from_file_location(module_name, module_lib)
-    module = importlib.util.module_from_spec(spec)
-    sys.modules[module_name] = module
-    spec.loader.exec_module(module)
-    return sys.modules[module_name]
+if TYPE_CHECKING:
+    from collections.abc import Iterator, Sequence
+    from types import ModuleType
 
 
 def compile_module(
-    source_pyx,
-    source_files=None,
-    include_dirs=None,
-    library_dirs=None,
-    language="c",
-    extra_compile_args=None,
-    extra_link_args=None,
-    name=None,
-    force_rebuild=False,
-    quiet=False,
-):
+    source_pyx: str,
+    *,
+    source_files: Sequence[Path | str] = (),
+    include_dirs: Sequence[Path | str] = (".",),
+    library_dirs: Sequence[Path | str] = (),
+    language: Literal["c", "c++"] | None = None,
+    extra_compile_args: list[str] | None = None,
+    extra_link_args: list[str] | None = None,
+    name: str = "_witty_module",
+    force_rebuild: bool = False,
+    quiet: bool = False,
+    **extension_kwargs: Any,
+) -> ModuleType:
     """Compile a Cython module given as a PYX source string.
 
-    The module will be stored in Cython's cache directory. Called with the same
-    ``source_pyx``, the cached module will be returned.
-
-    Args:
-
-        source_pyx (``str``):
-
-            The PYX source code.
-
-        source_files (list of ``Path``s, optional):
-
-            Additional source files the PYX code depends on. Changes to those
-            files will trigger re-compilation of the module.
-
-        include_dirs (list of ``Path``s, optional):
-        library_dirs (list of ``Path``s, optional):
-        language (``str``, optional):
-        extra_compile_args (list of ``str``, optional):
-        extra_link_args (list of ``str``, optional):
-
-            Arguments to forward to the Cython extension.
-
-        name (``str``, optional):
-
-            The base-name of the module file. Defaults to ``_witty_module``.
-
-        force_rebuild (``bool``, optional):
-
-            Force a rebuild even if a module with that name/hash already
-            exists.
-
-        quiet (``bool``, optional):
-
-            Supress output except errors and warnings.
-
-    Returns:
-
+    The module will be stored in
+    [Cython's cache directory](https://cython.readthedocs.io/en/latest/src/userguide/source_files_and_compilation.html#cython-cache).
+    Called with the same `source_pyx`, the cached module will be returned.
+
+    Parameters
+    ----------
+    source_pyx : str
+        The PYX source code.
+    source_files : list of Path, optional
+        Additional source files the PYX code depends on. Changes to these
+        files will trigger re-compilation of the module.
+    include_dirs : list of Path, optional
+        List of directories to search for C/C++ header files (in Unix
+        form for portability).
+    library_dirs : list of Path, optional
+        List of directories to search for C/C++ libraries at link time.
+    language : str, optional
+        Extension language (i.e., "c", "c++", "objc"). Will be detected
+        from the source extensions if not provided.
+    extra_compile_args : list of str, optional
+        Extra platform- and compiler-specific information to use when
+        compiling the source files in 'sources'. This is typically a
+        list of command-line arguments for platforms and compilers where
+        "command line" makes sense.
+    extra_link_args : list of str, optional
+        Extra platform- and compiler-specific information to use when
+        linking object files to create the extension (or a new static
+        Python interpreter). Has a similar interpretation as for 'extra_compile_args'.
+    name : str, optional
+        The base name of the module file. Defaults to "_witty_module".
+    force_rebuild : bool, optional
+        Force a rebuild even if a module with the same name/hash already exists.
+    quiet : bool, optional
+        Suppress output except for errors and warnings.
+    extension_kwargs : dict, optional
+        Additional keyword arguments passed to the distutils `Extension` constructor.
+
+    Returns
+    -------
+    ModuleType
         The compiled module.
     """
-
-    if source_files is None:
-        source_files = []
-    if include_dirs is None:
-        include_dirs = ["."]
-    if library_dirs is None:
-        library_dirs = []
-    if name is None:
-        name = "_witty_module"
-
-    source_pyx = to_unicode(source_pyx)
-    sources = [source_pyx]
-
-    for source_file in source_files:
-        sources.append(open(source_file, "r").read())
-
-    source_hashes = [
-        hashlib.md5(source.encode("utf-8")).hexdigest() for source in sources
-    ]
-    source_key = (source_hashes, sys.version_info, sys.executable, Cython.__version__)
-    module_hash = hashlib.md5(str(source_key).encode("utf-8")).hexdigest()
+    module_hash = _generate_hash(
+        source_pyx, source_files, extra_compile_args, extra_link_args, extension_kwargs
+    )
     module_name = name + "_" + module_hash
 
     # already loaded?
@@ -107,61 +92,127 @@ def compile_module(
     module_dir = Path(get_cython_cache_dir()) / "witty"
     module_pyx = (module_dir / module_name).with_suffix(".pyx")
     module_lib = (module_dir / module_name).with_suffix(module_ext)
-    module_lock = (module_dir / module_name).with_suffix(".lock")
 
     if not quiet:
         print(f"Compiling {module_name} into {module_lib}...")
 
     module_dir.mkdir(parents=True, exist_ok=True)
 
     # make sure the same module is not build concurrently
-    with open(module_lock, "w") as lock_f:
-        lock_file(lock_f)
-
+    with _module_locked(module_pyx):
         # already compiled?
         if module_lib.is_file() and not force_rebuild:
             if not quiet:
                 print(f"Reusing already compiled module from {module_lib}")
-            return load_dynamic(module_name, module_lib)
+            return _load_dynamic(module_name, module_lib)
 
         # create pyx file
-        with open(module_pyx, "w") as f:
-            f.write(source_pyx)
+        module_pyx.write_text(source_pyx)
 
         extension = Extension(
             module_name,
             sources=[str(module_pyx)],
-            include_dirs=include_dirs,
-            library_dirs=library_dirs,
+            include_dirs=[str(x) for x in include_dirs],
+            library_dirs=[str(x) for x in library_dirs],
             language=language,
             extra_compile_args=extra_compile_args,
             extra_link_args=extra_link_args,
+            **(extension_kwargs or {}),
         )
 
         build_extension.extensions = cythonize(
-            [extension], compiler_directives={"language_level": "3"}, quiet=quiet
+            [extension],
+            compiler_directives={"language_level": "3"},
+            quiet=quiet,
         )
         build_extension.build_temp = str(module_dir)
         build_extension.build_lib = str(module_dir)
         build_extension.run()
 
-    return load_dynamic(module_name, module_lib)
+    return _load_dynamic(module_name, module_lib)
+
+
+def _load_dynamic(module_name: str, module_path: Path) -> ModuleType:
+    """Dynamically load a module from a path."""
+    spec = importlib.util.spec_from_file_location(module_name, module_path)
+    if not spec or not spec.loader:
+        raise ImportError(f"Failed to load module {module_name} from {module_path}")
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[module_name] = module
+    spec.loader.exec_module(module)
+    return sys.modules[module_name]
+
+
+def _generate_hash(
+    source_pyx: str, source_files: Sequence[Path | str] = (), *args: dict | list | None
+) -> str:
+    """Generate a hash key for a `source_pyx` along with other source file paths."""
+    sources = [source_pyx] + [Path(source).read_text() for source in source_files]
+    src_hashes = [hashlib.md5(source.encode("utf-8")).hexdigest() for source in sources]
+    arg_hash = _hash_args(args)
+    source_key = (
+        src_hashes,
+        arg_hash,
+        sys.version_info,
+        sys.executable,
+        Cython.__version__,
+    )
+    return hashlib.md5(str(source_key).encode("utf-8")).hexdigest()
+
+
+def _hash_args(containers: tuple[dict | list | None, ...]) -> str:
+    """Hash a bunch of mutable arg container objects in a reproducible way.
+
+    This is for stuff like extra_compile_args, extra_link_args, and extension_kwargs.
+    """
+    hash_obj = hashlib.md5()
+    for container in containers:
+        # sort dict keys for reproducibility
+        serialized = json.dumps(container, sort_keys=True)
+        # Update the hash object with the serialized container
+        hash_obj.update(serialized.encode())
+    return hash_obj.hexdigest()
+
+
+@contextmanager
+def _module_locked(module_path: Path) -> Iterator[None]:
+    """Temporarily lock a module file to prevent concurrent compilation."""
+    module_lock_file = module_path.with_suffix(".lock")
+    with open(module_lock_file, "w") as lock_fd:
+        _lock_file(lock_fd)
+        try:
+            yield
+        finally:
+            _unlock_file(lock_fd)
+
+
+def _get_build_extension() -> build_ext:
+    # same as `cythonize` Build.Inline._get_build_extension
+    # vendored to avoid using a private API
+    dist = Distribution()
+    # Ensure the build respects distutils configuration by parsing
+    # the configuration files
+    config_files = dist.find_config_files()
+    dist.parse_config_files(config_files)
+    build_extension = build_ext(dist)
+    build_extension.finalize_options()
+    return build_extension
 
 
 if os.name == "nt":
     import msvcrt
 
-    def lock_file(file):
-        msvcrt.locking(file.fileno(), msvcrt.LK_LOCK, os.path.getsize(file.name))
+    def _lock_file(file: Any) -> None:
+        msvcrt.locking(file.fileno(), msvcrt.LK_LOCK, os.path.getsize(file.name))  # type: ignore
 
-    def unlock_file(file):
-        msvcrt.locking(file.fileno(), msvcrt.LK_UNLCK, os.path.getsize(file.name))
+    def _unlock_file(file: Any) -> None:
+        msvcrt.locking(file.fileno(), msvcrt.LK_UNLCK, os.path.getsize(file.name))  # type: ignore
 
 else:
     import fcntl
 
-    def lock_file(file):
+    def _lock_file(file: Any) -> None:
         fcntl.lockf(file, fcntl.LOCK_EX)
 
-    def unlock_file(file):
+    def _unlock_file(file: Any) -> None:
         fcntl.lockf(file, fcntl.LOCK_UN)