Add Ruff settings file.

Author: mikeckennedy

ruff.toml

@@ -0,0 +1,42 @@
+# [ruff]
+line-length = 120
+format.quote-style = "single"
+
+# Enable Pyflakes `E` and `F` codes by default.
+select = ["E", "F"]
+ignore = []
+
+# Exclude a variety of commonly ignored directories.
+exclude = [
+    ".bzr",
+    ".direnv",
+    ".eggs",
+    ".git",
+    ".hg",
+    ".mypy_cache",
+    ".nox",
+    ".pants.d",
+    ".ruff_cache",
+    ".svn",
+    ".tox",
+    "__pypackages__",
+    "_build",
+    "buck-out",
+    "build",
+    "dist",
+    "node_modules",
+    ".env",
+    ".venv",
+    "venv",
+]
+per-file-ignores = {}
+
+# Allow unused variables when underscore-prefixed.
+# dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+
+# Assume Python 3.11.
+target-version = "py311"
+
+#[tool.ruff.mccabe]
+## Unlike Flake8, default to a complexity level of 10.
+mccabe.max-complexity = 10