Add linting

.github/workflows/test.yml

@@ -27,9 +27,14 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install -r docs/requirements.txt
-          python -m pip install -U pytest
+          python -m pip install -U pytest ruff
           python -m pip install -e .
 
+      - name: Lint
+        run: |
+          ruff format --check sphinxcontrib
+          ruff check sphinxcontrib
+  
       - name: Test
         run: |
           pytest

pyproject.toml

@@ -0,0 +1,20 @@
+[tool.ruff]
+line-length = 150
+
+[tool.ruff.lint]
+extend-select = ["I"]
+
+[tool.ruff.lint.isort]
+combine-as-imports = true
+default-section = "third-party"
+known-first-party = ["sphinxcontrib.mermaid"]
+section-order = [
+    "future",
+    "standard-library",
+    "third-party",
+    "first-party",
+    "local-folder",
+]
+
+[tool.ruff.lint.per-file-ignores]
+"__init__.py" = ["F401", "F403"]