Set up [pre-commit](https://pre-commit.com/).

This includes isort, black and some basic hygiene on text files.

Author: Flameeyes

.bumpversion.cfg

@@ -7,4 +7,3 @@ current_version = 0.12.6
 files = setup.py cachecontrol/__init__.py docs/conf.py
 commit = True
 tag = True
-

.gitignore

@@ -14,4 +14,4 @@ include
 .Python
 docs/_build
 build/
-.tox
+.tox

.pre-commit-config.yaml

@@ -0,0 +1,17 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+    -   id: check-yaml
+    -   id: end-of-file-fixer
+    -   id: trailing-whitespace
+-   repo: https://github.com/timothycrosley/isort
+    rev: 4.3.21
+    hooks:
+      - id: isort
+        additional_dependencies:
+          - toml
+-   repo: https://github.com/python/black
+    rev: 19.10b0
+    hooks:
+    - id: black

dev_requirements.txt

@@ -10,6 +10,7 @@ cherrypy
 isort
 lockfile
 mock
+pre-commit
 pytest
 pytest-cov
 redis

pyproject.toml

@@ -1,6 +1,7 @@
 [tool.isort]
 line_length = 88
 known_first_party = ['cachecontrol']
+known_third_party = ['mock', 'lockfile', 'requests', 'pytest', 'msgpack', 'cherrypy']
 # Set multi-line output to "Vertical Hanging indent" to avoid fighting with black.
 multi_line_output = 3
 include_trailing_comma = true