Add linting infrastructure

.github/workflows/test.yaml

@@ -48,6 +48,18 @@ jobs:
         run: |
           uv tool run --with=tox-uv --with=tox-gh tox --colored=yes
 
+  lint:
+    name: 'Lint'
+    runs-on: 'ubuntu-24.04'
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0' # v7.0.0
+        with:
+          persist-credentials: 'false'
+
+      - name: 'Run linters'
+        uses: 'j178/prek-action@e98a699c41eb69ab013a45817a0406469a748f8d' # v2.0.5
+
   security:
     name: 'Security'
     runs-on: 'ubuntu-slim'

.pre-commit-config.yaml

@@ -0,0 +1,82 @@
+default_language_version:
+  python: "python3.14"
+
+exclude: "tests/sgml_input\\.html"
+
+repos:
+  - repo: "meta"
+    hooks:
+      - id: "check-hooks-apply"
+      - id: "check-useless-excludes"
+
+  - repo: "https://github.com/pre-commit/pre-commit-hooks"
+    rev: "3e8a8703264a2f4a69428a0aa4dcb512790b2c8c"  # frozen: v6.0.0
+    hooks:
+      - id: "check-added-large-files"
+      - id: "check-merge-conflict"
+      - id: "check-yaml"
+      - id: "end-of-file-fixer"
+      - id: "mixed-line-ending"
+        args:
+          - "--fix=lf"
+      - id: "trailing-whitespace"
+
+  - repo: "https://github.com/asottile/pyupgrade"
+    rev: "75992aaa40730136014f34227e0135f63fc951b4"  # frozen: v3.21.2
+    hooks:
+      - id: "pyupgrade"
+        name: "Enforce Python 3.10+ idioms"
+        args: ["--py310-plus"]
+
+  - repo: "https://github.com/sirosen/slyp"
+    rev: "072ea633cef088f143be7c16499d1564485dfc0c"  # frozen: 0.9.0
+    hooks:
+      - id: "slyp"
+
+  - repo: "https://github.com/psf/black-pre-commit-mirror"
+    rev: "4160603246a6b365d4a2af661c6d71b0a0f50478"  # frozen: 26.5.1
+    hooks:
+      - id: "black"
+        args:
+          - "--target-version=py314"
+
+  - repo: "https://github.com/pycqa/isort"
+    rev: "dac090ce4d9ee313d086e2e89ab1acb8c2664fa1"  # frozen: 9.0.0a3
+    hooks:
+      - id: "isort"
+
+  - repo: "https://github.com/pycqa/flake8"
+    rev: "c48217e1fc006c2dddd14df54e83b67da15de5cd"  # frozen: 7.3.0
+    hooks:
+      - id: "flake8"
+        additional_dependencies:
+          - "flake8-toml-config==1.0.0"
+          - "flake8-bugbear==25.11.29"
+
+  - repo: "https://github.com/editorconfig-checker/editorconfig-checker"
+    rev: "6fa6539948897d1dceee75b6680d7e9688b5c9e9"  # frozen: v3.8.0
+    hooks:
+      - id: "editorconfig-checker"
+
+  - repo: "https://github.com/python-jsonschema/check-jsonschema"
+    rev: "6b63472e72e1a91ed8a2f6d483790dfb644fa1d3"  # frozen: 0.37.4
+    hooks:
+      - id: "check-dependabot"
+      - id: "check-readthedocs"
+
+  - repo: "https://github.com/rhysd/actionlint"
+    rev: "914e7df21a07ef503a81201c76d2b11c789d3fca"  # frozen: v1.7.12
+    hooks:
+      - id: "actionlint"
+        additional_dependencies:
+          - "github.com/wasilibs/go-shellcheck/cmd/shellcheck@v0.11.1"
+
+  - repo: "https://github.com/kurtmckee/pre-commit-hooks"
+    rev: "44b638c826f1acd2ba2c5995db3156be60c5efea"  # frozen: v1.0.0
+    hooks:
+      - id: "verify-consistent-pyproject-toml-python-requirements"
+
+  - repo: "https://github.com/zizmorcore/zizmor-pre-commit"
+    rev: "e3eebf65325ccc992422292cb7a4baee967cf815"  # frozen: v1.26.1
+    hooks:
+    - id: "zizmor"

docs/conf.py

@@ -5,7 +5,7 @@
 # ---------------------
 
 # The suffix of source filenames.
-source_suffix = {'.rst': 'restructuredtext'}
+source_suffix = {".rst": "restructuredtext"}
 
 # The main toctree document.
 master_doc = "index"

docs/copyright.rst

@@ -16,4 +16,3 @@ Copyright © 1991-1995 Stichting Mathematisch Centrum. All rights reserved.
 -------
 
 See :doc:`license` for complete license and permissions information.
-

pyproject.toml

@@ -48,6 +48,23 @@ skip_covered = true
 fail_under = 75
 
 
+# flake8
+# ------
+
+[tool.flake8]
+max-line-length = 80
+extend-select = ["B950"]
+extend-ignore = ["E203", "E501", "E701"]
+
+
+# isort
+# -----
+
+[tool.isort]
+profile = "black"
+force_single_line = true
+
+
 # pytest
 # ------
 
@@ -59,4 +76,3 @@ filterwarnings = [
     "error",
 ]
 strict = true
-