From 1dbfecfff53a4102606e852e4332156f5cf13c86 Mon Sep 17 00:00:00 2001
From: David Hoese <david.hoese@ssec.wisc.edu>
Date: Mon, 16 Oct 2023 12:01:40 -0500
Subject: [PATCH] For strict channel priority in CI

---
 .github/workflows/ci.yaml |  1 +
 cython_test.pyx           | 17 +++++++++++++++++
 cython_test2.pyx          | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+)
 create mode 100644 cython_test.pyx
 create mode 100644 cython_test2.pyx

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index cc68ae9..f4688f5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -33,6 +33,7 @@ jobs:
           miniforge-variant: Mambaforge
           miniforge-version: latest
           use-mamba: true
+          channel-priority: strict
           python-version: ${{ matrix.python-version }}
           activate-environment: test-environment
           environment-file: continuous_integration/environment.yaml
diff --git a/cython_test.pyx b/cython_test.pyx
new file mode 100644
index 0000000..1a843b7
--- /dev/null
+++ b/cython_test.pyx
@@ -0,0 +1,17 @@
+# cython: language_level=3, boundscheck=False, cdivision=True, wraparound=False, initializedcheck=False, nonecheck=False
+cimport cython
+import numpy as np
+cimport numpy as np
+
+np.import_array()
+
+def test_func():
+    cdef np.ndarray[float, ndim=2] arr = np.zeros((5, 5), dtype=np.float32)
+    cdef float[:, ::1] arr_view = arr
+    _run(arr_view)
+
+cdef void _run(float[:, ::1] arr_view) noexcept nogil:
+    cdef float[:, :] tmp = _get_upper_left_corner(arr_view)
+
+cdef inline float[:, :] _get_upper_left_corner(float[:, ::1] arr) noexcept nogil:
+    return arr[:1, :1]
diff --git a/cython_test2.pyx b/cython_test2.pyx
new file mode 100644
index 0000000..ed5b8b0
--- /dev/null
+++ b/cython_test2.pyx
@@ -0,0 +1,34 @@
+# cython: language_level=3, boundscheck=False, cdivision=True, wraparound=False, initializedcheck=False, nonecheck=False
+cimport cython
+import numpy as np
+cimport numpy as np
+
+np.import_array()
+
+def test_func():
+    cdef np.ndarray[float, ndim=2] arr = np.zeros((5, 5), dtype=np.float32)
+    cdef float[:, ::1] arr_view = arr
+    t = Test(5.0)
+    t.call_me(arr_view)
+
+
+cdef class Test:
+
+    cdef float _a
+
+    def __cinit__(self, float a):
+        self._a = a
+
+    cdef void call_me(self, float[:, ::1] my_arr) noexcept:
+        with nogil:
+            self._call_me(my_arr)
+
+    cdef void _call_me(self, float[:, ::1] my_arr) noexcept nogil:
+        cdef Py_ssize_t idx
+        cdef float[:, :] my_arr2 = _get_upper_left_corner(my_arr)
+        for idx in range(my_arr2.shape[0]):
+            my_arr2[idx, 0] = self._a
+
+
+cdef inline float[:, :] _get_upper_left_corner(float[:, ::1] arr) noexcept nogil:
+    return arr[:3, :3]