PycodestyleBear.py: Find all bad codestyles

This commit modifies process_output to
process all the detected problems instead
of just the first one.

Fixes coala#2882

bear-requirements.txt

@@ -35,6 +35,7 @@ restructuredtext-lint~=1.0
 rstcheck~=3.1
 safety~=1.8.2
 scspell3k~=2.0
+six~=1.11.0
 sqlparse~=0.2.4
 vim-vint~=0.3.12,!=0.3.19
 vulture~=0.25.0

bears/python/PycodestyleBear.py

@@ -74,20 +74,22 @@ def create_arguments(
     def process_output(self, output, filename, file):
         if not output:  # backwards compatible no results
             return
-        result = re.match(OUTPUT_REGEX, output)
+        result = re.findall(OUTPUT_REGEX, output)  # find all matched output
         if not result:  # backwards compatible no results
             self.warn('{}: Unexpected output {}'.format(filename, output))
             return
-        line, column, message, rule = result.groups()
-        if rule == 'E501':
-            aspect = LineLength('py')
-        else:
-            aspect = None
-        yield Result.from_values(
-            origin='{} ({})'.format(self.name, rule),
-            message=message,
-            file=filename,
-            line=int(line),
-            column=int(column),
-            aspect=aspect,
-            )
+
+        for line, column, message, rule in result:
+            if rule == 'E501':
+                aspect = LineLength('py')
+            else:
+                aspect = None
+
+            yield Result.from_values(
+                origin='{} ({})'.format(self.name, rule),
+                message=message,
+                file=filename,
+                line=int(line),
+                column=int(column),
+                aspect=aspect,
+                )

test-requirements.txt

@@ -22,7 +22,7 @@ pytest-reorder~=0.1.0
 git+https://github.com/jayvdb/pytest-reqs@coala#egg=pytest-reqs
 pytest-timeout~=1.3.0
 pytest-travis-fold~=1.3.0
-pytest-xdist~=1.15
+pytest-xdist==1.15
 requests-mock~=1.2
 ipdb~=0.11
 pip<10

tests/python/PycodestyleBearTest.py

@@ -27,6 +27,13 @@ def hello():
     print("hello world")
 '''
 
+
+multiple_style_errors_file = '''
+x = 2;
+print( "hello world")
+'''
+
+
 file_with_very_long_line = ('def ' + 'h' * 1000 + '():\n' +
                             '    print("hello")')
 
@@ -114,3 +121,14 @@ def test_line_length(self):
                                  'E501 line too long (106 > 30 characters)')
                 self.assertEqual(result.origin, 'PycodestyleBear (E501)')
                 self.assertEqual(result.aspect, LineLength('py'))
+
+    def test_multiple_style_errors(self):
+        content = multiple_style_errors_file.splitlines()
+        with prepare_file(content, None) as (file, fname):
+            with execute_bear(self.uut, fname, file) as results:
+                self.assertEqual(len(results), 2)
+                result = results[1]
+                self.assertEqual(result.message,
+                                 'E201 whitespace after \'(\'')
+                self.assertEqual(result.origin, 'PycodestyleBear (E201)')
+                self.assertEqual(result.aspect, None)