Add get_contributors to log util

pootle/apps/pootle_log/utils.py

@@ -35,13 +35,6 @@ class ComparableLogEvent(BaseProxy):
                       if x not in ["__lt__", "__gt__", "__call__"])
 
     def __cmp__(self, other):
-        # valuable revisions are authoritative
-        if self.revision is not None and other.revision is not None:
-            if self.revision > other.revision:
-                return 1
-            elif self.revision < other.revision:
-                return -1
-
         # timestamps have the next priority
         if self.timestamp and other.timestamp:
             if self.timestamp > other.timestamp:
@@ -302,6 +295,27 @@ def get_events(self, **kwargs):
             for event in self.get_submission_events(**kwargs):
                 yield event
 
+    def get_contributors(self, **kwargs):
+        event_sources = kwargs.pop(
+            "event_sources",
+            ("submission", "suggestion", "unit_source"))
+        users = set()
+        if "unit_source" in event_sources:
+            for event in self.get_created_unit_events(**kwargs):
+                if event.user not in users and not event.user.username == "system":
+                    yield event.user
+                    users.add(event.user)
+        if "suggestion" in event_sources:
+            for event in self.get_suggestion_events(**kwargs):
+                if event.user not in users and not event.user.username == "system":
+                    yield event.user
+                    users.add(event.user)
+        if "submission" in event_sources:
+            for event in self.get_submission_events(**kwargs):
+                if event.user not in users and not event.user.username == "system":
+                    yield event.user
+                    users.add(event.user)
+
 
 class StoreLog(Log):
     include_meta = True