From a42299d008df7054532d52f84b0795d0e76cf5a8 Mon Sep 17 00:00:00 2001
From: Ian Cordasco <graffatcolmingov@gmail.com>
Date: Thu, 25 May 2017 20:02:58 -0500
Subject: [PATCH] Support spaces as error/ignore code separators

Closes #329
---
 src/flake8/utils.py      | 3 ++-
 tests/unit/test_utils.py | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/flake8/utils.py b/src/flake8/utils.py
index a4c67ce..953b594 100644
--- a/src/flake8/utils.py
+++ b/src/flake8/utils.py
@@ -10,6 +10,7 @@ import sys
 import tokenize
 
 DIFF_HUNK_REGEXP = re.compile(r'^@@ -\d+(?:,\d+)? \+(\d+)(?:,(\d+))? @@.*$')
+COMMA_SEPARATED_LIST_RE = re.compile(r'[,\s]')
 
 
 def parse_comma_separated_list(value):
@@ -27,7 +28,7 @@ def parse_comma_separated_list(value):
         return []
 
     if not isinstance(value, (list, tuple)):
-        value = value.split(',')
+        value = COMMA_SEPARATED_LIST_RE.split(value)
 
     item_gen = (item.strip() for item in value)
     return [item for item in item_gen if item]
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
index 0a12f2d..e50dade 100644
--- a/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@ -13,13 +13,18 @@ RELATIVE_PATHS = ["flake8", "pep8", "pyflakes", "mccabe"]
 @pytest.mark.parametrize("value,expected", [
     ("E123,\n\tW234,\n    E206", ["E123", "W234", "E206"]),
     ("E123,W234,E206", ["E123", "W234", "E206"]),
+    ("E123 W234 E206", ["E123", "W234", "E206"]),
+    ("E123\nW234 E206", ["E123", "W234", "E206"]),
+    ("E123\nW234\nE206", ["E123", "W234", "E206"]),
     ("E123,W234,E206,", ["E123", "W234", "E206"]),
+    ("E123,W234,E206, ,\n", ["E123", "W234", "E206"]),
     ("E123,W234,,E206,,", ["E123", "W234", "E206"]),
     ("E123,,W234,,E206,,", ["E123", "W234", "E206"]),
     (["E123", "W234", "E206"], ["E123", "W234", "E206"]),
     (["E123", "\n\tW234", "\n    E206"], ["E123", "W234", "E206"]),
     (["E123", "\n\tW234", "\n    E206", "\n"], ["E123", "W234", "E206"]),
     (["E123", "\n\tW234", "", "\n    E206", "\n"], ["E123", "W234", "E206"]),
+    (["E123", "\n\tW234", "", "\n    E206", ""], ["E123", "W234", "E206"]),
 ])
 def test_parse_comma_separated_list(value, expected):
     """Verify that similar inputs produce identical outputs."""