Add pre-commit hook setup

Author: asvetlov

.pre-commit-config.yaml

@@ -0,0 +1,65 @@
+repos:
+- repo: local
+  hooks:
+    - id: gen-cli-docs
+      name: Generate CLI docs
+      language: system
+      entry: make docs
+      pass_filenames: false
+- repo: local
+  hooks:
+    - id: check-mixin-classes
+      name: Validate mixins classes
+      language: system
+      entry: make check-mixins
+      pass_filenames: false
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: 'v4.0.1'
+  hooks:
+  - id: check-merge-conflict
+    exclude: "rst$"
+- repo: https://github.com/asottile/yesqa
+  rev: v1.2.3
+  hooks:
+  - id: yesqa
+- repo: https://github.com/pre-commit/mirrors-isort
+  rev: 'v5.9.3'
+  hooks:
+  - id: isort
+- repo: https://github.com/psf/black
+  rev: '21.8b0'
+  hooks:
+    - id: black
+      language_version: python3 # Should be a command that runs python3.6+
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: 'v4.0.1'
+  hooks:
+  - id: check-case-conflict
+  - id: check-json
+  - id: check-xml
+  - id: check-yaml
+  - id: debug-statements
+  - id: check-added-large-files
+  - id: end-of-file-fixer
+    exclude: "[.]md$"
+  - id: requirements-txt-fixer
+  - id: trailing-whitespace
+    exclude: "[.]md$"
+  - id: check-symlinks
+  - id: debug-statements
+# Another entry is required to apply file-contents-sorter to another file
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: 'v4.0.1'
+  hooks:
+  - id: file-contents-sorter
+    files: |
+      .gitignore
+- repo: https://github.com/asottile/pyupgrade
+  rev: 'v2.25.0'
+  hooks:
+  - id: pyupgrade
+    args: ['--py36-plus']
+- repo: https://gitlab.com/pycqa/flake8
+  rev: '3.9.2'
+  hooks:
+  - id: flake8