--- a/hggit/overlay.py	Mon Nov 27 18:34:24 2017 -0500
+++ b/hggit/overlay.py	Mon Nov 27 18:46:07 2017 -0500
@@ -14,11 +14,13 @@
 )
 from mercurial.node import bin, hex, nullid
 
+
 def _maybehex(n):
     if len(n) == 20:
         return hex(n)
     return n
 
+
 class overlaymanifest(object):
     def __init__(self, repo, sha):
         self.repo = repo
@@ -147,6 +149,7 @@
     def __delitem__(self, path):
         del self._map[path]
 
+
 def wrapmanifestdictdiff(orig, self, m2, match=None, clean=False):
     '''avoid calling into lazymanifest code if m2 is an overlaymanifest'''
     # Older mercurial clients used diff(m2, clean=False). If a caller failed
@@ -172,6 +175,7 @@
     else:
         return orig(self, m2, **kwargs)
 
+
 class overlayfilectx(object):
     def __init__(self, repo, path, fileid=None):
         self._repo = repo
@@ -204,6 +208,7 @@
     def isbinary(self):
         return util.binary(self.data())
 
+
 class overlaychangectx(context.changectx):
     def __init__(self, repo, sha):
         # Can't store this in self._repo because the base class uses that field
@@ -287,6 +292,7 @@
         return (self.commit.tree, self.user(), self.date(), self.files(),
                 self.description(), self.extra())
 
+
 class overlayrevlog(object):
     def __init__(self, repo, base):
         self.repo = repo
@@ -345,6 +351,7 @@
     def __len__(self):
         return len(self.repo.handler.repo) + len(self.repo.revmap)
 
+
 class overlayoldmanifestlog(overlayrevlog):
     def read(self, sha):
         if sha == nullid:
@@ -354,9 +361,11 @@
     def __getitem__(self, sha):
         return overlaymanifestctx(self.repo, sha)
 
+
 class overlaymanifestrevlog(overlayrevlog):
     pass
 
+
 class overlaymanifestctx(object):
     def __init__(self, repo, node):
         self._repo = repo
@@ -365,6 +374,7 @@
     def read(self):
         return overlaymanifest(self._repo, self._node)
 
+
 try:
     class overlaymanifestlog(manifest.manifestlog):
         def __init__(self, repo):
@@ -385,6 +395,7 @@
     # manifestlog did not exist prior to 4.0
     pass
 
+
 class overlaychangelog(overlayrevlog):
     def read(self, sha):
         if isinstance(sha, int):
@@ -407,6 +418,7 @@
             extra=values[5],
         )
 
+
 class overlayrepo(object):
     def __init__(self, handler, commits, refs):
         self.handler = handler