Adds support of co-authors of a patchset merged in openstack

According to the recommendation of the openstack wiki, every
patchset merged in openstack with in the commit message a flag
'co-authored-by' or 'also-by' will be considered for the commits
statistics.

Examples:
  Co-Authored-By: An User <user@os.org>
  Also-By: An User 2 <user2@os.org>

Change-Id: Ia58235c129061942963d34f860230097c64a9828
Implements: blueprint add-support-co-authored-by

stackalytics/processor/vcs.py

@@ -73,8 +73,13 @@ MESSAGE_PATTERNS = {
     'blueprint_id': re.compile(r'\b(?:blueprint|bp)\b[ \t]*[#:]?[ \t]*'
                                r'(?P<id>[a-z0-9-]+)', re.IGNORECASE),
     'change_id': re.compile('Change-Id: (?P<id>I[0-9a-f]{40})', re.IGNORECASE),
+    'co-author': re.compile(r'(?:Co-Authored|Also)-By:'
+                            r'\s*(?P<id>.*)\s', re.IGNORECASE)
 }
 
+CO_AUTHOR_PATTERN = re.compile(
+    r'(?P<author_name>.+)\s*<(?P<author_email>.+)>', re.IGNORECASE)
+
 
 class Git(Vcs):
 
@@ -216,6 +221,7 @@ class Git(Vcs):
                 commit['release'] = self.release_index[commit['commit_id']]
             else:
                 commit['release'] = None
+
             if 'blueprint_id' in commit:
                 commit['blueprint_id'] = [(commit['module'] + ':' + bp_name)
                                           for bp_name
@@ -223,6 +229,15 @@ class Git(Vcs):
 
             yield commit
 
+            # Handles co-authors in the commit message. According to the bp
+            # we want to count contribution for authors and co-authors.
+            if 'co-author' in commit:
+                for coauthor in commit['co-author']:
+                    m = re.match(CO_AUTHOR_PATTERN, coauthor)
+                    if utils.check_email_validity(m.group("author_email")):
+                        commit.update(m.groupdict())
+                        yield commit
+
     def get_last_id(self, branch):
         LOG.debug('Get head commit for repo uri: %s', self.repo['uri'])
 

tests/unit/test_vcs.py

@@ -99,10 +99,26 @@ message:Change-Id: Id32a4a72ec1d13992b306c4a38e73605758e26c7
 diff_stat:
 
  0 files changed, 0 insertions(+), 0 deletions(-)
+
+ 0 files changed
+commit_id:12811c76f3a8208b36f81e61451ec17d227b4e58
+date:1369831203
+author_name:Jimi Hendrix
+author_email:jimi.hendrix@openstack.com
+subject:adds support off co-authors
+message:Change-Id: Id811c762ec1d13992b306c4a38e7360575e61451
+Co-Authored-By: Tupac Shakur <tupac.shakur@openstack.com>
+Also-By: Bob Dylan <bob.dylan@openstack.com>
+
+diff_stat:
+
+ 0 files changed, 0 insertions(+), 0 deletions(-)
+
             '''
 
         commits = list(self.git.log('dummy', 'dummy'))
-        self.assertEqual(5, len(commits))
+        commits_expected = 6 + 2  # authors + co-authors
+        self.assertEqual(commits_expected, len(commits))
 
         self.assertEqual(21, commits[0]['files_changed'])
         self.assertEqual(340, commits[0]['lines_added'])
@@ -128,3 +144,8 @@ diff_stat:
         self.assertEqual(0, commits[4]['files_changed'])
         self.assertEqual(0, commits[4]['lines_added'])
         self.assertEqual(0, commits[4]['lines_deleted'])
+
+        self.assertEqual(
+            ['Tupac Shakur <tupac.shakur@openstack.com>',
+             'Bob Dylan <bob.dylan@openstack.com>'],
+            commits[5]['co-author'])