Add pre-commit setup

Author: linuxdaemon

.pre-commit-config.yaml

@@ -0,0 +1,37 @@
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v2.5.0
+  hooks:
+  - id: trailing-whitespace
+    args: ['--markdown-linebreak-ext=md,markdown']
+  - id: end-of-file-fixer
+  - id: check-yaml
+  - id: check-added-large-files
+  - id: check-ast
+  - id: check-byte-order-marker
+  - id: check-merge-conflict
+  - id: debug-statements
+  - id: detect-private-key
+- repo: https://github.com/psf/black
+  rev: 19.10b0
+  hooks:
+  - id: black
+- repo: https://github.com/asottile/blacken-docs
+  rev: v1.7.0
+  hooks:
+  - id: blacken-docs
+    additional_dependencies: [black==19.10b0]
+- repo: https://github.com/asottile/seed-isort-config
+  rev: v2.1.1
+  hooks:
+  - id: seed-isort-config
+- repo: https://github.com/pre-commit/mirrors-isort
+  rev: v4.3.21
+  hooks:
+  - id: isort
+- repo: https://github.com/pre-commit/pygrep-hooks
+  rev: v1.5.1
+  hooks:
+  - id: python-use-type-annotations
+  - id: python-no-eval
+  - id: python-no-log-warn

pyproject.toml

@@ -0,0 +1,27 @@
+[tool.isort]
+line_length=88
+multi_line_output=3
+include_trailing_comma=true
+use_parentheses=true
+
+[tool.black]
+line-length = 88
+target-version = ['py35']
+include = '\.pyi?$'
+exclude = '''
+(
+  /(
+      \.eggs         # exclude a few common directories in the
+    | \.git          # root of the project
+    | \.hg
+    | \.mypy_cache
+    | \.tox
+    | \.venv
+    | _build
+    | buck-out
+    | build
+    | dist
+    | venv
+  )/
+)
+'''