MSVC: Windows compatibility

.github/workflows/build.yml

@@ -20,8 +20,9 @@ jobs:
         - cp3*-manylinux_x86_64
         # MacOS wheels
         - cp3*-macosx_x86_64
-        # Until we have arm64 runners, we can't automatically test arm64 wheels
         - cp3*-macosx_arm64
+        # Windows wheels
+        - cp3*-win_amd64
       sdist: true
       test_command: python -c "from stcal.ramp_fitting.ols_cas22 import _ramp, _jump, _fit; from stcal.ramp_fitting import slope_fitter"
     secrets:

.github/workflows/ci.yml

@@ -35,6 +35,8 @@ jobs:
         - linux: py313-cov-xdist
           coverage: codecov
         - macos: py313-xdist
+        - windows: py313-xdist
+          python-version: '>=3.13.5 <3.14'
   test_downstream:
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/tox.yml@v1
     with:

setup.py

@@ -1,4 +1,6 @@
 import numpy as np
+import os
+import sys
 from Cython.Build import cythonize
 from Cython.Compiler import Options
 from setuptools import Extension, setup
@@ -15,9 +17,22 @@
 include_dirs = [np.get_include()]
 
 # Setup C module macros
-define_macros = [("NUMPY", "1")]
+define_macros = [
+    ("NUMPY", "1"),
+]
+
+# Setup C libraries
+libraries = []
+
+if sys.platform.startswith("win"):
+    define_macros.append(("PSAPI_VERSION", "1"))
+    libraries.append("psapi")
+
+debug_logdir= os.environ.get("DEBUG_LOGDIR")
+if debug_logdir:
+    define_macros.append(("DEBUG_LOGDIR", f"\"{debug_logdir}\""))
 
-# importing these extension modules is tested in `.github/workflows/build.yml`; 
+# importing these extension modules is tested in `.github/workflows/build.yml`;
 # when adding new modules here, make sure to add them to the `test_command` entry there
 extensions = [
     Extension(
@@ -43,6 +58,7 @@
         ["src/stcal/ramp_fitting/src/slope_fitter.c"],
         include_dirs=include_dirs,
         define_macros=define_macros,
+        libraries=libraries,
     ),
 ]
 

src/stcal/outlier_detection/median.py

@@ -5,6 +5,7 @@
 import logging
 import tempfile
 import warnings
+import sys
 from pathlib import Path
 from typing import Any
 
@@ -184,8 +185,13 @@
             msg = f"Invalid slice shape {slice_shape}. Only 2-D arrays are supported."
             raise ValueError(msg)
         self._filename = Path(filename)
-        with Path.open(self._filename, "wb") as f:   # noqa: F841
-            pass
+        try:
+            with Path.open(self._filename, "wb") as f:   # noqa: F841
+                pass
+        except PermissionError:
+            if self._filename.is_dir() and sys.platform.startswith("win"):
+                raise IsADirectoryError(self._filename)
+
         self._slice_shape = slice_shape
         self._dtype = np.dtype(dtype)
         self._append_count = 0