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-rw-r--r--lib/git/objects/utils.py11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/git/objects/utils.py b/lib/git/objects/utils.py
index a3c6edc7..a9c25da2 100644
--- a/lib/git/objects/utils.py
+++ b/lib/git/objects/utils.py
@@ -113,9 +113,14 @@ class Traversable(object):
``branch_first``
if True, items will be returned branch first, otherwise depth first
+ ``visit_once``
+ if True, items will only be returned once, although they might be encountered
+ several times. Loops are prevented that way.
+
``ignore_self``
if True, self will be ignored and automatically pruned from
the result. Otherwise it will be the first item to be returned"""
+ visited = set()
stack = Deque()
stack.append( ( 0 ,self ) ) # self is always depth level 0
@@ -132,6 +137,12 @@ class Traversable(object):
while stack:
d, item = stack.pop() # depth of item, item
+ if visit_once and item in visited:
+ continue
+
+ if visit_once:
+ visited.add(item)
+
if prune( item, d ):
continue