1 files changed, 18 insertions, 2 deletions

diff --git a/project.py b/project.py
index a55e7600..fe88a505 100644
--- a/project.py
+++ b/project.py
@@ -251,13 +251,29 @@ class DiffColoring(Coloring):
     self.fail = self.printer('fail', fg='red')
 
 
-class _Annotation(object):
+class Annotation(object):
 
   def __init__(self, name, value, keep):
     self.name = name
     self.value = value
     self.keep = keep
 
+  def __eq__(self, other):
+    if not isinstance(other, Annotation):
+      return False
+    return self.__dict__ == other.__dict__
+
+  def __lt__(self, other):
+    # This exists just so that lists of Annotation objects can be sorted, for
+    # use in comparisons.
+    if not isinstance(other, Annotation):
+      raise ValueError('comparison is not between two Annotation objects')
+    if self.name == other.name:
+      if self.value == other.value:
+        return self.keep < other.keep
+      return self.value < other.value
+    return self.name < other.name
+
 
 def _SafeExpandPath(base, subpath, skipfinal=False):
   """Make sure |subpath| is completely safe under |base|.
@@ -1448,7 +1464,7 @@ class Project(object):
     self.linkfiles.append(_LinkFile(self.worktree, src, topdir, dest))
 
   def AddAnnotation(self, name, value, keep):
-    self.annotations.append(_Annotation(name, value, keep))
+    self.annotations.append(Annotation(name, value, keep))
 
   def DownloadPatchSet(self, change_id, patch_id):
     """Download a single patch set of a single change to FETCH_HEAD.