add spelling check

.github/workflows/check-spelling.yml

@@ -0,0 +1,45 @@
+name: Checks - spelling
+
+on:
+  pull_request:
+  workflow_dispatch:
+  push:
+
+jobs:
+  spelling_check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install python3
+        run: |
+          apt update
+          apt install -y --no-install-recommends python3-pip
+
+      - name: Install codespell
+        run: pip install codespell
+
+      - name: Print codespell version
+        run: codespell --version
+
+      - name: Check out repository code
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - name: Run codespell
+        run: |
+          ./scripts/spelling.sh
+
+      - name: Run git diff to see if anything changed
+        run: /usr/bin/git diff --name-only --exit-code
+
+      - name: Run git diff if we failed
+        if: failure()
+        run: /usr/bin/git diff > spelling.patch
+
+      - name: Archive diff as a patch if we failed
+        uses: actions/upload-artifact@v3
+        if: failure()
+        with:
+          name: spelling.patch
+          path: |
+            ${{ github.workspace }}/spelling.patch

scripts/spelling.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# ---------------------------------------------------------------------------------
+# SUNDIALS Copyright Start
+# Copyright (c) 2002-2024, Lawrence Livermore National Security
+# and Southern Methodist University.
+# All rights reserved.
+#
+# See the top-level LICENSE and NOTICE files for details.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+# SUNDIALS Copyright End
+# ---------------------------------------------------------------------------------
+# This script will use codespell to check for common misspellings
+# ---------------------------------------------------------------------------------
+
+codespell \
+    --skip="*.git,*.bib,*.eps,*.pdf,*/fmod_int*,*/_themes" \
+    -L "inout,ans" \
+    --write-changes