--- a/mercurial/tags.py Tue Mar 28 06:38:09 2017 +0200
+++ b/mercurial/tags.py Tue Mar 28 10:14:55 2017 +0200
@@ -90,6 +90,45 @@
fnodes = _filterfnodes(fnodes, nodes)
return fnodes
+def _nulltonone(value):
+ """convert nullid to None
+
+ For tag value, nullid means "deleted". This small utility function helps
+ translating that to None."""
+ if value == nullid:
+ return None
+ return value
+
+def difftags(ui, repo, oldfnodes, newfnodes):
+ """list differences between tags expressed in two set of file-nodes
+
+ The list contains entries in the form: (tagname, oldvalue, new value).
+ None is used to expressed missing value:
+ ('foo', None, 'abcd') is a new tag,
+ ('bar', 'ef01', None) is a deletion,
+ ('baz', 'abcd', 'ef01') is a tag movement.
+ """
+ if oldfnodes == newfnodes:
+ return []
+ oldtags = _tagsfromfnodes(ui, repo, oldfnodes)
+ newtags = _tagsfromfnodes(ui, repo, newfnodes)
+
+ # list of (tag, old, new): None means missing
+ entries = []
+ for tag, (new, __) in newtags.items():
+ new = _nulltonone(new)
+ old, __ = oldtags.pop(tag, (None, None))
+ old = _nulltonone(old)
+ if old != new:
+ entries.append((tag, old, new))
+ # handle deleted tags
+ for tag, (old, __) in oldtags.items():
+ old = _nulltonone(old)
+ if old is not None:
+ entries.append((tag, old, None))
+ entries.sort()
+ return entries
+
def findglobaltags(ui, repo):
'''Find global tags in a repo: return a tagsmap