Use the ruff formatter, instead of black

I have based this commit on:
- ruff-pre-commit README.md | Using Ruff with pre-commit
  https://github.com/astral-sh/ruff-pre-commit/blob/main/README.md
- The Ruff Formatter | Conflicting lint rules
  https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules

Support for the ruff formatter was added in pytest-ruff by commits from
October 2023, released the same day as versions 0.2 and 0.2.1. Hence, it
makes sense to require pytest-ruff ≥ 0.2.1 now that we use the ruff
formatter.

I cannot find in ruff the equivalent for `skip-string-normalization` in
black. This is currently an open issue, in progress:
  astral-sh/ruff#7305
  astral-sh/ruff#7525
  astral-sh/ruff#8822
I have settled on single quotes, for now.

.pre-commit-config.yaml

@@ -1,5 +1,5 @@
 repos:
-- repo: https://github.com/psf/black
-  rev: 22.6.0
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  rev: v0.1.6
   hooks:
-  - id: black
+  - id: ruff-format

README.rst

@@ -11,10 +11,6 @@
     :target: https://github.com/astral-sh/ruff
     :alt: Ruff
 
-.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
-   :target: https://github.com/psf/black
-   :alt: Code style: Black
-
 .. .. image:: https://readthedocs.org/projects/PROJECT_RTD/badge/?version=latest
 ..    :target: https://PROJECT_RTD.readthedocs.io/en/latest/?badge=latest
 

pyproject.toml

@@ -2,7 +2,4 @@
 requires = ["setuptools>=56", "setuptools_scm[toml]>=3.4.1"]
 build-backend = "setuptools.build_meta"
 
-[tool.black]
-skip-string-normalization = true
-
 [tool.setuptools_scm]

pytest.ini

@@ -7,14 +7,6 @@ filterwarnings=
 	# Ensure ResourceWarnings are emitted
 	default::ResourceWarning
 
-	# shopkeep/pytest-black#55
-	ignore:<class 'pytest_black.BlackItem'> is not using a cooperative constructor:pytest.PytestDeprecationWarning
-	ignore:The \(fspath. py.path.local\) argument to BlackItem is deprecated.:pytest.PytestDeprecationWarning
-	ignore:BlackItem is an Item subclass and should not be a collector:pytest.PytestWarning
-
-	# shopkeep/pytest-black#67
-	ignore:'encoding' argument not specified::pytest_black
-
 	# realpython/pytest-mypy#152
 	ignore:'encoding' argument not specified::pytest_mypy
 

ruff.toml

@@ -0,0 +1,22 @@
+[lint]
+extend-ignore = [
+  # https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules
+  "W191",
+  "E111",
+  "E114",
+  "E117",
+  "D206",
+  "D300",
+  "Q000",
+  "Q001",
+  "Q002",
+  "Q003",
+  "COM812",
+  "COM819",
+  "ISC001",
+  "ISC002",
+]
+
+[format]
+# https://docs.astral.sh/ruff/settings/#format-quote-style
+quote-style = "single"

setup.cfg

@@ -30,15 +30,12 @@ testing =
 	# upstream
 	pytest >= 6
 	pytest-checkdocs >= 2.4
-	pytest-black >= 0.3.7; \
-		# workaround for jaraco/skeleton#22
-		python_implementation != "PyPy"
 	pytest-cov
 	pytest-mypy >= 0.9.1; \
 		# workaround for jaraco/skeleton#22
 		python_implementation != "PyPy"
 	pytest-enabler >= 2.2
-	pytest-ruff
+	pytest-ruff >= 0.2.1
 
 	# local