Run lint with pre-commit

.github/workflows/lint.yml

@@ -15,6 +15,22 @@ jobs:
     steps:
     - uses: actions/checkout@v1
 
+    - name: pip cache
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/pip
+        key: lint-pip-${{ hashFiles('**/setup.py') }}
+        restore-keys: |
+          lint-pip-
+
+    - name: pre-commit cache
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/pre-commit
+        key: lint-pre-commit-${{ hashFiles('**/.pre-commit-config.yaml') }}
+        restore-keys: |
+          lint-pre-commit-
+
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
@@ -30,3 +46,4 @@ jobs:
 
     - name: Lint
       run: tox -e lint
+

.pre-commit-config.yaml

@@ -0,0 +1,32 @@
+repos:
+  - repo: https://github.com/psf/black
+    rev: 19.10b0
+    hooks:
+      - id: black
+        args: ["--target-version", "py35"]
+        # Only .py files, until https://github.com/psf/black/issues/402 resolved
+        files: \.py$
+        types: []
+
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.7.9
+    hooks:
+      - id: flake8
+        additional_dependencies: [flake8-2020, flake8-implicit-str-concat]
+
+  - repo: https://github.com/timothycrosley/isort
+    rev: 4.3.21
+    hooks:
+      - id: isort
+
+  - repo: https://github.com/pre-commit/pygrep-hooks
+    rev: v1.5.1
+    hooks:
+      - id: python-check-blanket-noqa
+      - id: rst-backticks
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.5.0
+    hooks:
+      - id: check-merge-conflict
+      - id: check-yaml

.travis.yml

@@ -1,6 +1,9 @@
 dist: xenial
 language: python
-cache: pip
+cache:
+  pip: true
+  directories:
+    - $HOME/.cache/pre-commit
 
 notifications:
   irc: "chat.freenode.net#pil"

MANIFEST.in

@@ -6,6 +6,7 @@ include *.py
 include *.rst
 include *.sh
 include *.txt
+include *.yaml
 include LICENSE
 include Makefile
 include tox.ini

tox.ini

@@ -24,13 +24,9 @@ deps =
 
 [testenv:lint]
 commands =
-    black --target-version py35 --check --diff .
-    flake8 --statistics --count
-    isort --check-only --diff
+    pre-commit run --all-files
     check-manifest
 deps =
-    black
+    pre-commit
     check-manifest
-    flake8
-    isort
 skip_install = true