From 53cd37bac50e7a927deba5b67a4412301b96230d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Thu, 23 May 2019 23:58:35 +0700
Subject: [PATCH] [utils] Improve strip_or_none

---
 test/test_utils.py  | 13 +++++++++++++
 youtube_dl/utils.py |  4 ++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/test/test_utils.py b/test/test_utils.py
index 9ef0e422b..71980b3fc 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -73,6 +73,7 @@ from youtube_dl.utils import (
     smuggle_url,
     str_to_int,
     strip_jsonp,
+    strip_or_none,
     timeconvert,
     unescapeHTML,
     unified_strdate,
@@ -752,6 +753,18 @@ class TestUtil(unittest.TestCase):
         d = json.loads(stripped)
         self.assertEqual(d, {'status': 'success'})
 
+    def test_strip_or_none(self):
+        self.assertEqual(strip_or_none(' abc'), 'abc')
+        self.assertEqual(strip_or_none('abc '), 'abc')
+        self.assertEqual(strip_or_none(' abc '), 'abc')
+        self.assertEqual(strip_or_none('\tabc\t'), 'abc')
+        self.assertEqual(strip_or_none('\n\tabc\n\t'), 'abc')
+        self.assertEqual(strip_or_none('abc'), 'abc')
+        self.assertEqual(strip_or_none(''), '')
+        self.assertEqual(strip_or_none(None), None)
+        self.assertEqual(strip_or_none(42), None)
+        self.assertEqual(strip_or_none([]), None)
+
     def test_uppercase_escape(self):
         self.assertEqual(uppercase_escape('aä'), 'aä')
         self.assertEqual(uppercase_escape('\\U0001d550'), '𝕐')
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 9be9b2e76..ead9bd862 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1951,8 +1951,8 @@ def bool_or_none(v, default=None):
     return v if isinstance(v, bool) else default
 
 
-def strip_or_none(v):
-    return None if v is None else v.strip()
+def strip_or_none(v, default=None):
+    return v.strip() if isinstance(v, compat_str) else default
 
 
 def url_or_none(url):