format: introduce pre-commit

Author: henryiii

.github/workflows/format.yml

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+name: Format
+
+on:
+  pull_request:
+  push:
+    branches:
+    - master
+
+jobs:
+  pre-commit:
+    name: Pre-commit checks
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+    - uses: pre-commit/[email protected]

.pre-commit-config.yaml

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+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v3.1.0
+  hooks:
+  - id: check-added-large-files
+  - id: check-case-conflict
+  - id: check-merge-conflict
+  - id: check-symlinks
+  - id: check-yaml
+  - id: debug-statements
+  - id: end-of-file-fixer
+  - id: mixed-line-ending
+  - id: requirements-txt-fixer
+  - id: trailing-whitespace
+  - id: fix-encoding-pragma
+
+- repo: https://github.com/mgedmin/check-manifest
+  rev: "0.42"
+  hooks:
+  - id: check-manifest
+
+- repo: https://gitlab.com/pycqa/flake8
+  rev: 3.8.3
+  hooks:
+  - id: flake8
+    additional_dependencies:
+    - flake8-bugbear
+    - flake8-import-order

MANIFEST.in

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+include *.py
+include LICENSE

setup.cfg

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+[flake8]
+ignore = E203, E231, E501, E722, W503, B950
+select = C,E,F,W,B,B9,I
+
+[bdist_wheel]
+universal = 1
+
+[check-manifest]
+ignore =
+  .github
+  .pre-commit-config.yaml
+  requirements.txt