Configure ruff lints and add to CI

.github/workflows/lint.yml

@@ -0,0 +1,10 @@
+name: Lints
+on: [push, pull_request]
+jobs:
+  lint:
+    name: Run lints
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run ruff
+        uses: astral-sh/ruff-action@v3

pyproject.toml

@@ -35,3 +35,30 @@ kernels = "kernels.cli:main"
 [project.entry-points."egg_info.writers"]
 "kernels.lock" = "kernels.lockfile:write_egg_lockfile"
 
+
+[tool.ruff]
+exclude = [
+    ".eggs",
+    ".git",
+    ".git-rewrite",
+    ".hg",
+    ".mypy_cache",
+    ".nox",
+    ".pants.d",
+    ".pytype",
+    ".ruff_cache",
+    ".svn",
+    ".tox",
+    ".venv",
+    ".venv*",
+    "__pypackages__",
+    "_build",
+    "build",
+    "dist",
+    "venv",
+]
+line-length = 119
+# Ignored rules:
+# "E501" -> line length violation
+lint.ignore = ["E501"]
+lint.select = ["E", "F", "I", "W"]

src/kernels/__init__.py

@@ -1,3 +1,3 @@
-from kernels.utils import get_kernel, install_kernel, load_kernel, get_locked_kernel
+from kernels.utils import get_kernel, get_locked_kernel, install_kernel, load_kernel
 
 __all__ = ["get_kernel", "get_locked_kernel", "load_kernel", "install_kernel"]

src/kernels/cli.py

@@ -6,7 +6,7 @@ from pathlib import Path
 
 from kernels.compat import tomllib
 from kernels.lockfile import KernelLock, get_kernel_locks
-from kernels.utils import build_variant, install_kernel, install_kernel_all_variants
+from kernels.utils import install_kernel, install_kernel_all_variants
 
 
 def main():

src/kernels/lockfile.py

@@ -1,5 +1,5 @@
-from dataclasses import dataclass
 import hashlib
+from dataclasses import dataclass
 from pathlib import Path
 from typing import Dict, List, Tuple
 

src/kernels/utils.py

@@ -5,17 +5,16 @@ import importlib.metadata
 import inspect
 import json
 import os
-from pathlib import Path
 import platform
 import sys
 from importlib.metadata import Distribution
+from pathlib import Path
 from types import ModuleType
 from typing import Dict, List, Optional, Tuple
 
-from huggingface_hub import hf_hub_download, snapshot_download
+from huggingface_hub import snapshot_download
 from packaging.version import parse
 
-from kernels.compat import tomllib
 from kernels.lockfile import KernelLock, VariantLock
 
 CACHE_DIR: Optional[str] = os.environ.get("HF_KERNELS_CACHE", None)

tests/test_basic.py

@@ -1,5 +1,6 @@
 import pytest
 import torch
+
 from kernels import get_kernel
 
 

tests/test_benchmarks.py

@@ -1,5 +1,6 @@
 import pytest
 import torch
+
 from kernels import get_kernel