setuptools plugin stub

Author: tlambert03

pyproject.toml

@@ -53,8 +53,9 @@ dev = [
 scyjava-stubgen = "scyjava._stubs._cli:main"
 
 [project.entry-points.hatch]
-mypyc = "scyjava._stubs._hatchling"
-
+scyjava = "scyjava._stubs._hatchling_plugin"
+[project.entry-points."distutils.commands"]
+build_py = "scyjava_stubgen.build:build_py"
 
 [project.urls]
 homepage = "https://github.com/scijava/scyjava"

src/scyjava/_stubs/_hatchling.py renamed to src/scyjava/_stubs/_hatchling_plugin.py

@@ -0,0 +1,79 @@
+"""Setuptools build hook for generating Java stubs.
+
+To use this hook, add the following to your `pyproject.toml`:
+
+```toml
+[build-system]
+requires      = ["setuptools>=69", "wheel", "scyjava"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.cmdclass]
+build_py = "scyjava_stubgen.build:build_py"
+# optional project-specific defaults
+maven_coordinates = ["org.scijava:parsington:3.1.0"]
+prefixes          = ["org.scijava"]
+```
+
+This will generate stubs for the given maven coordinates and prefixes. The generated
+stubs will be placed in `src/scyjava/types` and will be included in the wheel package.
+This hook is only run when building a wheel package.
+"""
+
+from __future__ import annotations
+
+import logging
+from pathlib import Path
+from typing import List
+
+from setuptools.command.build_py import build_py as _build_py
+from scyjava._stubs._genstubs import generate_stubs
+
+log = logging.getLogger("scyjava")
+
+
+class build_py(_build_py):  # type: ignore[misc]
+    """
+    A drop-in replacement for setuptools' build_py that
+    generates Java type stubs before Python sources are copied
+    into *build_lib*.
+    """
+
+    # expose two optional CLI/pyproject options so users can override defaults
+    user_options: List[tuple[str, str | None, str]] = _build_py.user_options + [
+        ("maven-coordinates=", None, "List of Maven coordinates to stub"),
+        ("prefixes=", None, "Java package prefixes to include"),
+    ]
+
+    def initialize_options(self) -> None:  # noqa: D401
+        super().initialize_options()
+        self.maven_coordinates: list[str] | None = None
+        self.prefixes: list[str] | None = None
+
+    def finalize_options(self) -> None:  # noqa: D401
+        """Fill in options that may come from pyproject metadata."""
+        super().finalize_options()
+        dist = self.distribution  # alias
+        if self.maven_coordinates is None:
+            self.maven_coordinates = getattr(dist, "maven_coordinates", [])
+        if self.prefixes is None:
+            self.prefixes = getattr(dist, "prefixes", [])
+
+    def run(self) -> None:  # noqa: D401
+        """Generate stubs, then let the normal build_py proceed."""
+        if self.maven_coordinates:
+            dest = Path(self.build_lib, "scyjava", "types")
+            dest.parent.mkdir(parents=True, exist_ok=True)
+            (dest.parent / "py.typed").touch()
+
+            generate_stubs(
+                endpoints=self.maven_coordinates,
+                prefixes=self.prefixes,
+                output_dir=dest,
+                remove_namespace_only_stubs=True,
+            )
+            log.info("Generated stubs for %s", ", ".join(self.maven_coordinates))
+
+            # make sure the wheel knows about them
+            self.package_data.setdefault("scyjava", []).append("types/**/*.pyi")
+
+        super().run()