More clang-tidy cleanups in writer.cpp (#345)

.clang-tidy

@@ -0,0 +1 @@
+Checks: '-*,cppcoreguidelines-*,-cppcoreguidelines-pro-type-union-access'

.github/workflows/unit-test.yml

@@ -11,9 +11,25 @@ jobs:
   code-checks:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: pre-commit/action@v3.0.0
 
+  clang-tidy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+    - name: Install nanobind
+      run: python -m pip install nanobind
+    - name: Build project
+      run: |
+        cmake -S . -B build -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        cmake --build build
+        ln -s build/compile_commands.json
+    - name: Run clang-tidy
+      run: |
+        clang-tidy src/pantab/writer.cpp
+
   build_wheels:
     name: Build wheels on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}