# HG changeset patch
# User Anton Shestakov <av6@dwimlabs.net>
# Date 1588092193 -28800
# Node ID 77a77d0f5441c809bfb173d1ad8fd2becd4b8349
# Parent  6d0d9ba04a1d93cc136f8abe422d63aa2029cba8
evolve: provide cache to successorssets() in _singlesuccessor()

Since we're using obsutil.successorssets() in a loop, it may help performance
to have cache.

diff -r 6d0d9ba04a1d -r 77a77d0f5441 hgext3rd/evolve/utility.py
--- a/hgext3rd/evolve/utility.py	Wed Apr 29 00:28:15 2020 +0800
+++ b/hgext3rd/evolve/utility.py	Wed Apr 29 00:43:13 2020 +0800
@@ -112,14 +112,15 @@
         return p.rev()
     obs = repo[p]
     ui = repo.ui
-    newer = obsutil.successorssets(repo, obs.node())
+    cache = {}
+    newer = obsutil.successorssets(repo, obs.node(), cache=cache)
     # search of a parent which is not killed
     while not newer:
         ui.debug(b"stabilize target %s is plain dead,"
                  b" trying to stabilize on its parent\n" %
                  obs)
         obs = obs.p1()
-        newer = obsutil.successorssets(repo, obs.node())
+        newer = obsutil.successorssets(repo, obs.node(), cache=cache)
     if len(newer) > 1 or len(newer[0]) > 1:
         raise MultipleSuccessorsError(newer)