[PATCH 2 of 6] revlog: deltachain() returns chain of revs need to construct a revision

in3xes at gmail.com in3xes at gmail.com
Mon Aug 9 11:09:17 CDT 2010


# HG changeset patch
# User Pradeepkumar Gayam <in3xes at gmail.com>
# Date 1281366268 -19800
# Node ID 9536451a578d75dae45bbefb197d48ef6d06d64c
# Parent  127044ace0a8bcc4412d5b4b74c6e5b9d189356c
revlog: deltachain() returns chain of revs need to construct a revision

diff -r 127044ace0a8 -r 9536451a578d mercurial/revlog.py
--- a/mercurial/revlog.py	Mon Aug 09 20:33:14 2010 +0530
+++ b/mercurial/revlog.py	Mon Aug 09 20:34:28 2010 +0530
@@ -1020,6 +1020,25 @@
     def _chunkclear(self):
         self._chunkcache = (0, '')
 
+    def deltaparent(self, rev):
+        """return previous revision or parentrev according to flags"""
+        if self.base(rev) == rev:
+            return nullrev
+        elif self.flags(rev) & REVIDX_PARENTDELTA:
+            return self.parentrevs(rev)[0]
+        else:
+            return rev-1
+
+
+    def deltachain(self, rev):
+        """return chain of revisions to construct a given revision"""
+        chain = []
+        while self.base(rev) != rev:
+            chain.append(rev)
+            rev = self.deltaparent(rev)
+        chain.reverse()
+        return rev, chain
+
     def revdiff(self, rev1, rev2):
         """return or calculate a delta between two revisions"""
         if rev1 + 1 == rev2 and self.base(rev1) == self.base(rev2):


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