Support Bluepad32 gamepads as native Joy-Con pair sources

tests/test_native_gamepad_motion_parser_native.py

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+from __future__ import annotations
+
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "tools"))
+
+from prepare_bluepad32 import prepare_bluepad32
+
+
+def test_native_gamepad_motion_parser_provenance(tmp_path: Path) -> None:
+    root = Path(__file__).resolve().parents[1]
+    compiler = shutil.which("cc") or shutil.which("gcc")
+    assert compiler is not None, "a host C compiler is required"
+    prepared = prepare_bluepad32(
+        root / "external" / "bluepad32",
+        root / "patches" / "bluepad32-sdl3-imu.patch",
+        tmp_path / "bluepad32-src",
+    )
+    component = prepared / "src" / "components" / "bluepad32"
+    executable = tmp_path / "native_gamepad_motion_parser_test"
+    subprocess.run(
+        [
+            compiler,
+            "-std=gnu11",
+            "-O1",
+            "-Wall",
+            "-Wextra",
+            "-ffunction-sections",
+            "-fdata-sections",
+            "-DENABLE_BLE",
+            "-DENABLE_CLASSIC",
+            "-DSWITCH2_BRIDGE_FULL_INPUT=1",
+            "-DHID_MESSAGE_TYPE_GET_REPORT=4",
+            "-DHID_REPORT_TYPE_FEATURE=3",
+            f"-I{root / 'tests' / 'switch_parser_native_stubs'}",
+            f"-I{root / 'bluepad32_config'}",
+            f"-I{component / 'include'}",
+            str(root / "tests" / "native_gamepad_motion_parser_test.c"),
+            str(
+                root / "bluepad32_config" / "parser" / "uni_hid_parser_native_motion.c"
+            ),
+            str(component / "parser" / "uni_hid_parser_ds4.c"),
+            str(component / "parser" / "uni_hid_parser_psmove.c"),
+            str(component / "parser" / "uni_hid_parser_switch.c"),
+            str(component / "uni_circular_buffer.c"),
+            str(component / "uni_utils.c"),
+            str(component / "controller" / "uni_gamepad.c"),
+            "-Wl,--gc-sections",
+            "-o",
+            str(executable),
+        ],
+        check=True,
+        cwd=root,
+    )
+    subprocess.run([str(executable)], check=True, cwd=root)