replace black and isort with ruff

Author: ohmayr

packages/django-google-spanner/noxfile.py

@@ -15,9 +15,9 @@
 
 import nox
 
-BLACK_VERSION = "black==22.3.0"
-ISORT_VERSION = "isort==5.11.0"
-BLACK_PATHS = [
+
+RUFF_VERSION = "ruff==0.14.14"
+LINT_PATHS = [
     "docs",
     "django_spanner",
     "tests",
@@ -52,23 +52,35 @@ def lint(session):
     Returns a failure if the linters find linting errors or sufficiently
     serious code quality issues.
     """
-    session.install("flake8", BLACK_VERSION)
-    session.run("black", "--check", *BLACK_PATHS)
+    session.install("flake8", RUFF_VERSION)
+    
+    # 2. Check formatting
+    session.run(
+        "ruff",
+        "format",
+        "--check",
+        f"--target-version=py{ALL_PYTHON[0].replace('.', '')}",
+        "--line-length=88",
+        *LINT_PATHS,
+    )
+
     session.run("flake8", "django_spanner", "tests")
 
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def blacken(session):
-    """Run black.
-
-    Format code to uniform standard.
-
-    This currently uses Python 3.6 due to the automated Kokoro run of synthtool.
-    That run uses an image that doesn't have 3.6 installed. Before updating this
-    check the state of the `gcp_ubuntu_config` we use for that Kokoro run.
-    """
-    session.install(BLACK_VERSION)
-    session.run("black", *BLACK_PATHS)
+    """(Deprecated) Legacy session. Please use 'nox -s format'."""
+    session.log(
+        "WARNING: The 'blacken' session is deprecated and will be removed in a future release. Please use 'nox -s format' in the future."
+    )
+    session.install(RUFF_VERSION)
+    session.run(
+        "ruff",
+        "format",
+        f"--target-version=py{ALL_PYTHON[0].replace('.', '')}",
+        "--line-length=88",
+        *LINT_PATHS,
+    )
 
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
@@ -343,13 +355,31 @@ def prerelease_deps(session):
 @nox.session
 def format(session: nox.sessions.Session) -> None:
     """
-    Run isort to sort imports. Then run black
-    to format code to uniform standard.
+    Run ruff to sort imports and format code.
     """
-    session.install(BLACK_VERSION, ISORT_VERSION)
+    # 1. Install ruff (skipped automatically if you run with --no-venv)
+    session.install(RUFF_VERSION)
     python_files = [path for path in os.listdir(".") if path.endswith(".py")]
 
-    # Use the --fss option to sort imports using strict alphabetical order.
-    # See https://pycqa.github.io/isort/docs/configuration/options.html#force-sort-within-sections
-    session.run("isort", "--fss", *python_files)
-    session.run("black", *python_files)
+    # 2. Run Ruff to fix imports
+    # check --select I: Enables strict import sorting
+    # --fix: Applies the changes automatically
+    session.run(
+        "ruff",
+        "check",
+        "--select",
+        "I",
+        "--fix",
+        f"--target-version=py{ALL_PYTHON[0].replace('.', '')}",
+        "--line-length=88",  # Standard Black line length
+        *python_files,
+    )
+    
+    # 3. Run Ruff to format code
+    session.run(
+        "ruff",
+        "format",
+        f"--target-version=py{ALL_PYTHON[0].replace('.', '')}",
+        "--line-length=88",  # Standard Black line length
+        *python_files,
+    )