[contrib, committed] check_GNU_style_lib.py: Fix trailing whitespace check

[contrib, committed] check_GNU_style_lib.py: Fix trailing whitespace check

[Tom de Vries]

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Hi,

this patch fixes the trailing whitespace check in check_GNU_style_lib.py.

Atm, the lines passed to the checks contain the eol char, so the 
trailing whitespace regexp '(\s+)$' matches for a line '123\n', which is 
in fact without trailing whitespace.

Fixed by removing the eol char.

Committed.

Thanks,
- Tom

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check_GNU_style_lib.py: Fix trailing whitespace check

2017-05-28  Tom de Vries  <tom@codesourcery.com>

	* check_GNU_style_lib.py (TrailingWhitespaceCheck.check): Assert no
	trailing eol.
	(TrailingWhitespaceTest): New unit test.
	(check_GNU_style_file): Remove eol before checking.

---
 contrib/check_GNU_style_lib.py | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/contrib/check_GNU_style_lib.py b/contrib/check_GNU_style_lib.py
index e1031df..63d0538 100755
--- a/contrib/check_GNU_style_lib.py
+++ b/contrib/check_GNU_style_lib.py
@@ -104,6 +104,7 @@ class TrailingWhitespaceCheck:
         self.re = re.compile('(\s+)$')
 
     def check(self, filename, lineno, line):
+        assert(len(line) == 0 or line[-1] != '\n')
         m = self.re.search(line)
         if m != None:
             return CheckError(filename, lineno,
@@ -223,6 +224,18 @@ class LineLengthTest(unittest.TestCase):
         self.assertEqual(r.console_error,
             self.check.limit * 'a' + error_string(' = 123;'))
 
+class TrailingWhitespaceTest(unittest.TestCase):
+    def setUp(self):
+        self.check = TrailingWhitespaceCheck()
+
+    def test_trailing_whitespace_check_basic(self):
+        r = self.check.check('foo', 123, 'a = 123;')
+        self.assertIsNone(r)
+        r = self.check.check('foo', 123, 'a = 123; ')
+        self.assertIsNotNone(r)
+        r = self.check.check('foo', 123, 'a = 123;\t')
+        self.assertIsNotNone(r)
+
 def check_GNU_style_file(file, file_encoding, format):
     checks = [LineLengthCheck(), SpacesCheck(), TrailingWhitespaceCheck(),
         SentenceSeparatorCheck(), SentenceEndOfCommentCheck(),
@@ -244,7 +257,8 @@ def check_GNU_style_file(file, file_encoding, format):
             for line in hunk:
                 if line.is_added and line.target_line_no != None:
                     for check in checks:
-                        e = check.check(t, line.target_line_no, line.value)
+                        line_chomp = line.value.replace('\n', '')
+                        e = check.check(t, line.target_line_no, line_chomp)
                         if e != None:
                             errors.append(e)