Use Ruff and fix all its warnings

.pre-commit-config.yaml

@@ -0,0 +1,61 @@
+default_language_version:
+  python: python3.12
+repos:
+  # Apply a consistent format to pyproject.toml files.
+  # https://pyproject-fmt.readthedocs.io/en/latest/
+  - repo: https://github.com/tox-dev/pyproject-fmt
+    rev: "1.4.0"
+    hooks:
+      - id: pyproject-fmt
+
+  - repo: https://github.com/asottile/add-trailing-comma
+    rev: v3.1.0
+    hooks:
+      - id: add-trailing-comma
+
+    # Some out-of-the-box hooks for pre-commit.
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: check-ast
+      - id: check-builtin-literals
+      - id: check-docstring-first
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: check-toml
+      - id: check-vcs-permalinks
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+      - id: name-tests-test
+        args: [--pytest-test-first]
+      - id: trailing-whitespace
+        args: [--markdown-linebreak-ext=md]
+        exclude_types:
+          - "html"
+
+  # Run Pyupgrade on all Python files. This will upgrade the code to Python 3.12.
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v3.15.0
+    hooks:
+      - id: pyupgrade
+        args: ["--py312-plus"]
+
+  # An extremely fast Python linter and formatter.
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.1.3
+    hooks:
+      - id: ruff-format
+      - id: ruff
+        args: ["--fix", "--exit-non-zero-on-fix"]
+
+  # Static checker for GitHub Actions workflow files.
+  - repo: https://github.com/rhysd/actionlint
+    rev: v1.6.26
+    hooks:
+      - id: actionlint
+
+  # Optimize .png files.
+  - repo: https://github.com/shssoichiro/oxipng
+    rev: v9.0.0
+    hooks:
+      - id: oxipng