Adopt the Ruff code linting tool

https://github.com/charliermarsh/ruff

pyproject.toml

@@ -135,6 +135,54 @@ exclude = [
 [tool.isort]
 line_length = 95
 
+[tool.ruff]
+target-version = "py38"  # Pin Ruff to Python 3.8
+line-length = 95
+exclude = [
+    '.git',
+    '.tox',
+    '.venv',
+    'tests/roots/*',
+    'build/*',
+    'doc/_build/*',
+    'sphinx/search/*',
+    'doc/usage/extensions/example*.py',
+]
+ignore = [
+    # pycodestyle
+    'E741',
+    # flake8-bugbear
+    'B006',
+    'B023',
+    # flake8-bugbear opinionated (disabled by default in flake8)
+    'B904',
+    'B905',
+]
+external = [  # Whitelist for RUF100 unkown code warnings
+    "E704",
+    "W291",
+    "W293",
+]
+select = [
+    "E",   # pycodestyle
+    "F",   # Pyflakes
+    "W",   # pycodestyle
+    # plugins:
+    "B",   # flake8-bugbear
+    "C4",  # flake8-comprehensions
+    "SIM", # flake8-simplify
+    "RUF100"  # yesqa
+]
+
+[tool.ruff.per-file-ignores]
+"tests/*" = ["E501"]
+"sphinx/environment/collectors/toctree.py" = ["B026"]
+"sphinx/environment/adapters/toctree.py" = ["B026"]
+
+# Ruff does not support 'import-order-style = smarkets'
+"sphinx/util/__init__.py" = ["F401"]
+"sphinx/util/inspect.py" = ["F401"]
+
 [tool.mypy]
 check_untyped_defs = true
 disallow_incomplete_defs = true