Use Ruff linting (#277)

Author: AA-Turner

Diff for: .pre-commit-config.yaml

@@ -16,6 +16,7 @@ repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: v0.11.5
     hooks:
+      - id: ruff
       - id: ruff-format
 
   - repo: https://github.com/python-jsonschema/check-jsonschema

Diff for: .ruff.toml

@@ -5,3 +5,25 @@ output-format = "full"
 [format]
 preview = true
 docstring-code-format = true
+
+[lint]
+preview = true
+select = [
+    "C4",    # flake8-comprehensions
+    "B",     # flake8-bugbear
+    "E",     # pycodestyle
+    "F",     # pyflakes
+    "FA",    # flake8-future-annotations
+    "FLY",   # flynt
+    "I",     # isort
+    "N",     # pep8-naming
+    "PERF",  # perflint
+    "PGH",   # pygrep-hooks
+    "PT",    # flake8-pytest-style
+    "TC",    # flake8-type-checking
+    "UP",    # pyupgrade
+    "W",     # pycodestyle
+]
+ignore = [
+    "E501",  # Ignore line length errors (we use auto-formatting)
+]

Diff for: build_docs.py

@@ -65,18 +65,19 @@
 from urllib.parse import urljoin
 
 import jinja2
+import platformdirs
 import tomlkit
 import urllib3
 import zc.lockfile
-from platformdirs import user_config_path, site_config_path
 
 TYPE_CHECKING = False
 if TYPE_CHECKING:
     from collections.abc import Collection, Iterator, Sequence, Set
     from typing import Literal
 
 try:
-    from os import EX_OK, EX_SOFTWARE as EX_FAILURE
+    from os import EX_OK
+    from os import EX_SOFTWARE as EX_FAILURE
 except ImportError:
     EX_OK, EX_FAILURE = 0, 1
 
@@ -279,7 +280,7 @@ def filter(self, language_tags: Sequence[str] = ()) -> Sequence[Language]:
         """Filter a sequence of languages according to --languages."""
         if language_tags:
             language_tags = frozenset(language_tags)
-            return [l for l in self if l.tag in language_tags]
+            return [l for l in self if l.tag in language_tags]  # NoQA: E741
         return list(self)
 
 
@@ -480,7 +481,7 @@ def setup_switchers(versions: Versions, languages: Languages, html_root: Path) -
     - Cross-link various languages in a language switcher
     - Cross-link various versions in a version switcher
     """
-    language_pairs = sorted((l.tag, l.switcher_label) for l in languages if l.in_prod)
+    language_pairs = sorted((l.tag, l.switcher_label) for l in languages if l.in_prod)  # NoQA: E741
     version_pairs = [(v.name, v.picker_label) for v in reversed(versions)]
 
     switchers_template_file = HERE / "templates" / "switchers.js"
@@ -1057,28 +1058,29 @@ def setup_logging(log_directory: Path, select_output: str | None) -> None:
 
 
 def load_environment_variables() -> None:
-    _user_config_path = user_config_path("docsbuild-scripts")
-    _site_config_path = site_config_path("docsbuild-scripts")
-    if _user_config_path.is_file():
-        ENV_CONF_FILE = _user_config_path
-    elif _site_config_path.is_file():
-        ENV_CONF_FILE = _site_config_path
+    dbs_user_config = platformdirs.user_config_path("docsbuild-scripts")
+    dbs_site_config = platformdirs.site_config_path("docsbuild-scripts")
+    if dbs_user_config.is_file():
+        env_conf_file = dbs_user_config
+    elif dbs_site_config.is_file():
+        env_conf_file = dbs_site_config
     else:
         logging.info(
             "No environment variables configured. "
-            f"Configure in {_site_config_path} or {_user_config_path}."
+            f"Configure in {dbs_site_config} or {dbs_user_config}."
         )
         return
 
-    logging.info(f"Reading environment variables from {ENV_CONF_FILE}.")
-    if ENV_CONF_FILE == _site_config_path:
-        logging.info(f"You can override settings in {_user_config_path}.")
-    elif _site_config_path.is_file():
-        logging.info(f"Overriding {_site_config_path}.")
-    with open(ENV_CONF_FILE, "r") as f:
-        for key, value in tomlkit.parse(f.read()).get("env", {}).items():
-            logging.debug(f"Setting {key} in environment.")
-            os.environ[key] = value
+    logging.info(f"Reading environment variables from {env_conf_file}.")
+    if env_conf_file == dbs_site_config:
+        logging.info(f"You can override settings in {dbs_user_config}.")
+    elif dbs_site_config.is_file():
+        logging.info(f"Overriding {dbs_site_config}.")
+
+    env_config = env_conf_file.read_text(encoding="utf-8")
+    for key, value in tomlkit.parse(env_config).get("env", {}).items():
+        logging.debug(f"Setting {key} in environment.")
+        os.environ[key] = value
 
 
 def build_docs_with_lock(args: argparse.Namespace, lockfile_name: str) -> int:

Diff for: tests/test_build_docs.py

@@ -4,7 +4,7 @@
 
 
 @pytest.mark.parametrize(
-    "seconds, expected",
+    ("seconds", "expected"),
     [
         (0.4, "0s"),
         (0.5, "0s"),

Diff for: tests/test_build_docs_versions.py

@@ -1,4 +1,4 @@
-from build_docs import Versions, Version
+from build_docs import Version, Versions
 
 
 def test_filter_default() -> None: