Fix ruff. Add pre-commit.

Author: Shyue Ping Ong

.pre-commit-config.yaml

@@ -0,0 +1,47 @@
+exclude: ^(docs|.*test_files|cmd_line|tasks.py)
+
+ci:
+  autoupdate_schedule: monthly
+  skip: [mypy]
+  autofix_commit_msg: pre-commit auto-fixes
+  autoupdate_commit_msg: pre-commit autoupdate
+
+repos:
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.0.278
+    hooks:
+      - id: ruff
+        args: [--fix]
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: check-yaml
+        exclude: pymatgen/analysis/vesta_cutoffs.yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+
+  - repo: https://github.com/psf/black
+    rev: 23.7.0
+    hooks:
+      - id: black
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.4.1
+    hooks:
+      - id: mypy
+
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.2.5
+    hooks:
+      - id: codespell
+        stages: [commit, commit-msg]
+        exclude_types: [html]
+        additional_dependencies: [tomli] # needed to read pyproject.toml below py3.11
+
+  - repo: https://github.com/MarcoGorelli/cython-lint
+    rev: v0.15.0
+    hooks:
+      - id: cython-lint
+        args: [--no-pycodestyle]
+      - id: double-quote-cython-strings

package/__init__.py

@@ -1,3 +1 @@
-"""
-Root init file.
-"""
+"""Root init file."""

setup.py

@@ -2,12 +2,7 @@
 
 from __future__ import annotations
 
-import platform
-import sys
-
-import numpy as np
-from setuptools import Extension, find_namespace_packages, setup
-
+from setuptools import find_namespace_packages, setup
 
 with open("README.md") as file:
     long_description = file.read()

tests/conftest.py

@@ -1,3 +1 @@
-"""
-Test fixtures for unittests.
-"""
+"""Test fixtures for unittests."""