Add ruff linter

.github/workflows/ruff.yml

@@ -0,0 +1,16 @@
+name: Ruff
+on:
+  push:
+    branches:
+      - main
+      - dev
+  pull_request:
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/ruff-action@v3
+        with:
+          args: check --output-format=github

.pre-commit-config.yaml

@@ -0,0 +1,18 @@
+repos:
+
+# pre-commit-hooks
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v4.1.0
+  hooks:
+    - id: check-merge-conflict
+    - id: check-yaml
+    - id: end-of-file-fixer
+    - id: trailing-whitespace
+# ruff
+repos:
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  # Ruff version.
+  rev: v0.11.7
+  hooks:
+    # Run the linter.
+    - id: ruff

pyproject.toml

@@ -66,6 +66,12 @@ docs = [
     "numpydoc>=1.5.0",
     "myst-nb>=0.17.1",
 ]
+dev = [
+    {include-group = "docs"},
+    {include-group = "testing"},
+    "pre-commit",
+    "ruff<=0.11.4",
+]
 
 [project.optional-dependencies]
 jupyter = [
@@ -77,6 +83,29 @@ jupyter = [
     "jupyterlab",
 ]
 
+[tool.ruff]
+src = ["cadetrdm", "tests"]
+exclude = ["examples", "docs"]
+line-length = 88
+
+[tool.ruff.lint]
+preview = true
+select = ["E", "F", "W", "D", "ANN"]
+ignore = ["D100", "D212", "D203", "ANN401"]
+exclude = ['__init__.py']
+
+[tool.ruff.lint.pydocstyle]
+convention = "numpy"
+
+[tool.ruff.lint.pycodestyle]
+max-line-length = 100
+max-doc-length = 94
+
+[tool.ruff.lint.per-file-ignores]
+"tests/*.py" = ["D", "E731", "ANN", "E402"]
+# E731 are lambda expressions for tests, D are general docstrings
+
+
 [tool.pytest.ini_options]
 markers = [
     "slow: marks tests as slow (deselect with '-m \"not slow\"')",