add in pre-commit to repo and have it mirror the precommit as setup in pytest

Author: gnikonorov

.pre-commit-config.yaml

@@ -0,0 +1,45 @@
+repos:
+    - repo: https://github.com/psf/black
+      rev: 19.10b0
+      hooks:
+          - id: black
+            args: [--safe, --quiet]
+    - repo: https://github.com/pre-commit/pre-commit-hooks
+      rev: v3.1.0
+      hooks:
+         - id: trailing-whitespace
+         - id: end-of-file-fixer
+         - id: fix-encoding-pragma
+           args: [--remove]
+         - id: check-yaml
+         - id: debug-statements
+           laneuage_version: python3
+      exclude: _pytest/(debugging|hookspec).py
+    - repo: https://gitlab.com/pycqa/flake8
+      rev: 3.8.3
+      hooks:
+         - id: flake8
+           language_version: python3
+           additional_dependencies: [flake8-typing-imports==1.9.0]
+    - repo: https://github.com/asottile/reorder_python_imports
+      rev: v2.3.1
+      hooks:
+         - id: reorder-python-imports
+           args: ['--application-directories=.:src', --py3-plus]
+    - repo: https://github.com/asottile/pyupgrade
+      rev: v2.7.1
+      hooks:
+         - id: pyupgrade
+           args: [--py3-plus]
+    - repo: https://github.com/asottile/setup-cfg-fmt
+      rev: v1.10.0
+      hooks:
+         - id: setup-cfg-fmt
+	- repo: local
+      hooks:
+      	 - id: rst
+           name: rst
+           entry: rst-lint --encoding utf-8
+           files: ^(CHANGES.rst|README.rst)$
+           language: python
+           additional_dependencies: [pygments, restructuredtext_lint]

tox.ini

@@ -4,7 +4,12 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py{35,36,37,38,py3}-pytest{50,51,52,53,54},
+distshare = {homedir}/.tox/distshare
+envlist =
+    linting
+    py{35,36,37,38,py3}-pytest{50,51,52,53,54}
+isolated_build = True
+minversion = 3.5.3
 
 [testenv]
 commands = py.test test_pytest_rerunfailures.py {posargs}
@@ -14,3 +19,10 @@ deps =
     pytest52: pytest==5.2.*
     pytest53: pytest==5.3.*
     pytest54: pytest==5.4.*
+
+# potentially can add install_command ( see https://tox.readthedocs.io/en/latest/config.html?highlight=skip_install#conf-skip_install )
+[testenv:linting]
+basepython = python3
+commands = pre-commit run --all-files --show-diff-on-failure {posargs:}
+deps = pre-commit>=1.11.0
+skip_install = True