add pre-commit

Author: nschloe

.github/workflows/ci.yml

@@ -12,18 +12,12 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/setup-python@v2
-      with:
-        python-version: "3.x"
-    - uses: actions/checkout@v2
-    - name: Lint with flake8
-      run: |
-        pip install flake8
-        flake8 .
-    - name: Lint with black
-      run: |
-        pip install black
-        black --check .
+      - name: Check out repo
+        uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+      - name: Run pre-commit
+        uses: pre-commit/[email protected]
 
   build:
     runs-on: ubuntu-latest

.pre-commit-config.yaml

@@ -0,0 +1,16 @@
+repos:
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.9.1
+    hooks:
+      - id: isort
+
+  - repo: https://github.com/python/black
+    rev: 21.6b0
+    hooks:
+      - id: black
+        language_version: python3
+
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.9.2
+    hooks:
+      - id: flake8