ADDED: pyproject.toml

* Used only for ruff linter configuration (for now)

pyproject.toml

@@ -0,0 +1,42 @@
+# -----------------------------------------------------------------------------
+# SECTION: ruff -- Python linter
+# -----------------------------------------------------------------------------
+# SEE: https://github.com/charliermarsh/ruff
+# Enable pycodestyle (`E`) and Pyflakes (`F`) codes by default.
+[tool.ruff]
+select = ["E", "F"]
+ignore = []
+
+# Allow autofix for all enabled rules (when `--fix`) is provided.
+fixable = ["A", "B", "C", "D", "E", "F", "G", "I", "N", "Q", "S", "T", "W",
+    "ANN", "ARG", "BLE", "COM", "DJ", "DTZ", "EM", "ERA", "EXE", "FBT", "ICN", "INP", "ISC",
+    "NPY", "PD", "PGH", "PIE", "PL", "PT", "PTH", "PYI", "RET", "RSE", "RUF", "SIM", "SLF",
+    "TCH", "TID", "TRY", "UP", "YTT"
+]
+unfixable = []
+
+# Exclude a variety of commonly ignored directories.
+exclude = [
+    ".direnv",
+    ".eggs",
+    ".git",
+    ".ruff_cache",
+    ".tox",
+    ".venv*",
+    "__pypackages__",
+    "build",
+    "dist",
+    "venv",
+]
+per-file-ignores = {}
+
+# Same as Black.
+# WAS: line-length = 88
+line-length = 100
+
+# Allow unused variables when underscore-prefixed.
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+target-version = "py310"
+
+[tool.ruff.mccabe]
+max-complexity = 10