Move flake8 configuration to setup.cfg & amend

Author: akx

setup.cfg

@@ -23,3 +23,37 @@ packages =
 
 [bdist_wheel]
 universal = 1
+
+[flake8]
+max-line-length = 99
+extend-ignore =
+    # ignore line length problems; those are fixed by black
+    E501
+    # via black
+    E203
+    W503
+    # docstring format leniency
+    D100
+    D104
+    D105
+    D200
+    D202
+    D205
+    D400
+    D401
+    D403
+    # things from `hacking` we don't care about
+    H101
+    H301
+    H306
+    H404
+    H405
+per-file-ignores =
+    test/*: D101,D102,D103,F841,S101,S106,B011
+    # ignore "imported but not used" in any __init__.pys
+    */__init__.py: F401
+exclude =
+    .git
+    ENV
+    __pycache__
+    build

tox.ini

@@ -15,26 +15,3 @@ deps = -rrequirements-dev.txt
 passenv = *
 commands = py.test test/ {posargs: -x}
 deps = -rrequirements-dev.txt
-
-[flake8]
-ignore = D100,  # missing docstring in public module
-         D105,
-         D200,  # one line docstring should fit on one line with quotes
-         D203,  # 1 blank line required before class docstring
-         D205,  # blank line required after description (in docstrings)
-         H101,
-         H238,
-         H301,
-         H304,
-         H404,
-         H405
-exclude =
-    # No need to traverse our git directory
-    .git,
-    # There's no value in checking cache directories
-    __pycache__,
-    # ...or build ones
-    build,
-    # Ignore virtualenv
-    ENV
-max-line-length = 99