Issue 7196 - Centralize flake8 configuration

flake8-eyeo/flake8_eyeo.py

 # This file is part of Adblock Plus <https://adblockplus.org/>,
 # Copyright (C) 2006-present eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ skipping 476 matching lines @@
             is_compare_in_assign = (
                 isinstance(parent, (ast.Assign, ast.keyword)) and
                 any(isinstance(x, ast.Compare) for x in ast.walk(node))
             )
             if is_tuple or is_nested_op or is_compare_in_assign:
                 continue
 
             yield (pos[0], pos[1], 'A111 redundant parenthesis', None)
 
 
-for checker in [check_ast, check_non_default_encoding,
-                check_quotes, check_redundant_parenthesis]:
+class DefaultConfigOverride:
+    def __init__(self, _):
+        pass
+
+    @classmethod
+    def add_options(cls, parser):
+        parser.extend_default_ignore([
+            # We don't want to make doc strings mandatory
+            # but merely lint existing doc strings.
+            'D1',
+            # Adding a comma after variable args/kwargs
+            # is a syntax error in Python 2 (and <= 3.4).
+            'C815',
+        ])
+
+        # Remove everything but W503 & W504 from the built-in default ignores.
+        parser.parser.defaults['ignore'] = 'W503,W504'
+
+
+for checker in [check_ast, check_non_default_encoding, check_quotes,
+                check_redundant_parenthesis, DefaultConfigOverride]:
     checker.name = 'eyeo'
     checker.version = __version__