Added pre-commit configuration

.github/workflows/tests.yaml

@@ -43,3 +43,12 @@ jobs:
           key: pip|${{ hashFiles('setup.py') }}|${{ hashFiles('tox.ini') }}
       - run: pip install tox
       - run: tox -e docs
+  style:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v1
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit|${{ hashFiles('.pre-commit-config.yaml') }}
+      - run: pip install tox
+      - run: tox -e style

.pre-commit-config.yaml

@@ -0,0 +1,17 @@
+---
+repos:
+  - repo: https://github.com/asottile/reorder_python_imports
+    rev: v3.1.0
+    hooks:
+      - id: reorder-python-imports
+        args: ["--application-directories", "src"]
+  - repo: https://github.com/psf/black
+    rev: 22.6.0
+    hooks:
+      - id: black
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.3.0
+    hooks:
+      - id: check-byte-order-marker
+      - id: trailing-whitespace
+      - id: end-of-file-fixer

setup.cfg

@@ -1,5 +1,5 @@
 [tox:tox]
-envlist = py37,py38,py39,py310,docs
+envlist = py37,py38,py39,py310,docs,style
 
 [testenv]
 deps = --editable .[test]
@@ -15,5 +15,10 @@ source-dir = docs/source
 build-dir = docs/build
 all_files = 1
 
+[testenv:style]
+deps = pre-commit
+skip_install = true
+commands = pre-commit run --all-files --show-diff-on-failure
+
 [upload_sphinx]
 upload-dir = docs/build/html