Enable linting in CI

.flake8

@@ -0,0 +1,32 @@
+[flake8]
+# max_line_length = 79
+# max-complexity = 10
+doctests = true
+# https://github.com/psf/black/blob/main/docs/guides/using_black_with_other_tools.md
+extend-ignore = E203,E501,E701,W503,SC,CNL,D,A,N,BLK,CCR,B902
+# extend-ignore = I  # flake8-import-order: not compatible with isort
+# extend-ignore = SC  # flake8-spellcheck: too aggressive
+# extend-ignore = CNL  # flake8-class-newline: incompatible with black
+# extend-ignore = A003,A005  # Python builtin is shadowed by class attribute / module
+extend-select = W504,B950
+# https://docs.astral.sh/ruff/rules/#pydocstyle-d
+# D105: undocumented-magic-method
+# D107: undocumented-public-init
+# extend-ignore = E203,W503,D105,D107  # D* are in pyproject.toml
+per-file-ignores =
+    **/tests/*: D,T003
+    tables/__init__.py: E402,F401,F403,F405
+statistics = True
+count = True
+extend-exclude = **/tests/*
+
+# flake8-cognitive-complexity
+# max-cognitive-complexity = 7  # default
+max-cognitive-complexity = 11
+
+# flake8-noqa
+noqa-require-code = True
+
+# flake8-spellcheck
+dictionaries = en_US,python,technical,pandas
+# spellcheck-allowlist-file = .spellcheck-allowlist

.github/workflows/ci.yml

@@ -39,6 +39,29 @@ jobs:
           path: dist/*.tar.gz
 
 
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - name: Install lint dependencies
+        shell: bash
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install flake8
+          if [ -f requirements-lint.txt ]; then pip install -r requirements-lint.txt; fi
+
+      - name: Lint (flake8)
+        run: |
+          python -m flake8 --count --show-source --statistics tables
+
+
   build:
     name: ${{ matrix.os }} ${{ matrix.python }} ${{ matrix.numpy }} ${{ matrix.name }}
     runs-on: ${{ matrix.os }}