build: tooling for ruff formatting

Author: nedbat

.pre-commit-config.yaml

@@ -15,6 +15,11 @@ repos:
       - id: trailing-whitespace
         exclude: "stress_phystoken|\\.py,cover$"
 
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.12.9
+    hooks:
+      - id: ruff-format
+
   - repo: https://github.com/pre-commit/pygrep-hooks
     rev: v1.10.0
     hooks:

pyproject.toml

@@ -156,13 +156,12 @@ ghrel_template = """
 """
 
 ## RUFF
-# We aren't using ruff for real yet...
+# We are using ruff for formatting, but not for linting.
 
 [tool.ruff]
 # PYVERSION
 target-version = "py39"     # Can't use [project]
 line-length = 100
-src = ["coverage", "tests"]
 
 [tool.ruff.lint]
 select = ["ALL"]

requirements/dev.in

@@ -17,6 +17,7 @@ cogapp
 greenlet
 pylint
 readme_renderer
+ruff
 
 # for kitting.
 libsass

requirements/dev.pip

@@ -157,6 +157,8 @@ rfc3986==2.0.0
     # via twine
 rich==14.1.0
     # via twine
+ruff==0.12.9
+    # via -r requirements/dev.in
 scriv==1.7.0
     # via -r requirements/dev.in
 setuptools==80.9.0

tox.ini

@@ -104,6 +104,7 @@ commands =
     # If this command fails, see the comment at the top of doc/cmd.rst
     python -m cogapp -cP --check --verbosity=1 doc/*.rst
     python -m cogapp -cP --check --verbosity=1 .github/workflows/*.yml
+    ruff format --check
     python -m pylint -j 0 --notes= --ignore-paths 'doc/_build/.*' {env:LINTABLE}
     check-manifest --ignore 'doc/sample_html/*'
     # If 'build -q' becomes a thing (https://github.com/pypa/build/issues/188),