Replace black/flake8 with ruff

Author: Repiteo

.flake8

@@ -14,6 +14,7 @@ RELEASE  VERSION/DATE TO BE FILLED IN LATER
       access SCons internals.
     - Migrate setup.cfg logic to pyproject.toml; remove setup.cfg.
     - Update .gitattributes to match .editorconfig; enforce eol settings.
+    - Replace black/flake8 with ruff for more efficient formatting & linting.
 
   From Raymond Li:
     - Fix issue #3935: OSErrors are now no longer hidden during execution of

CHANGES.txt

@@ -92,6 +92,9 @@ DEVELOPMENT
   The repo-wide line-ending is now `lf`, with the exception of a few
   Windows-only files using `crlf` instead. Any files not already fitting
   this format have been explicitly converted.
+- Repository linter/formatter changed from flake8/black to ruff, as the
+  latter grants an insane speed boost without compromising functionality.
+  Existing settings were migrated 1-to-1 where possible.
 
 
 Thanks to the following contributors listed below for their contributions to this release.

RELEASE.txt

@@ -66,11 +66,30 @@ dist-dir = "build/dist"
 [tool.distutils.bdist_wheel]
 dist-dir = "build/dist"
 
-# for black and mypy, set the lowest Python version supported
-[tool.black]
-quiet = true
-target-version = ['py36']
-skip-string-normalization = true
+[tool.ruff]
+target-version = "py37" # Lowest python version supported
+extend-include = ["SConstruct", "SConscript"]
+extend-exclude = [
+    "bench",
+    "bin",
+    "doc",
+    "src",
+    "template",
+    "test",
+    "testing",
+    "timings",
+    "SCons/Tool/docbook/docbook-xsl-1.76.1",
+    "bootstrap.py",
+    "runtest.py",
+]
+
+[tool.ruff.format]
+quote-style = "preserve" # Equivalent to black's "skip-string-normalization"
+
+[tool.ruff.lint.per-file-ignores]
+"SCons/Util/__init__.py" = [
+    "F401", # Module imported but unused
+]
 
 [tool.mypy]
-python_version = "3.6"
+python_version = "3.6" # Lowest python version supported (v0.971 and below)