Use pre-commit similar to what pytest does

Author: BeyondEvil

pre-commit-config.yaml

@@ -0,0 +1,14 @@
+repos:
+
+-   repo: https://github.com/psf/black
+    rev: stable
+    hooks:
+    -   id: black
+        args: [--safe, --quiet]
+        language_version: python3
+
+-   repo: https://gitlab.com/pycqa/flake8
+    rev: 3.7.7
+    hooks:
+    -   id: flake8
+        language_version: python3

pytest_selenium/drivers/appium.py

@@ -8,6 +8,7 @@
 PORT = os.environ.get("APPIUM_PORT", 4723)
 
 
+
 def driver_kwargs(capabilities, host, port, **kwargs):
     executor = "http://{0}:{1}/wd/hub".format(host, port)
     kwargs = {"command_executor": executor, "desired_capabilities": capabilities}

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py{27,36,37,py,py3}, docs, flake8, black
+envlist = py{27,36,37,py,py3}, docs, linting
 
 [testenv]
 passenv = PYTEST_ADDOPTS
@@ -22,6 +22,12 @@ changedir = docs
 deps = sphinx
 commands = sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
 
+[testenv:linting]
+skip_install = True
+basepython = python3
+deps = pre-commit
+commands = pre-commit run --all-files --show-diff-on-failure
+
 [testenv:flake8]
 skip_install = true
 basepython = python