# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 2018-09-07 15:17:37
# Node ID 05a165dc4f55593e00959477e6d779e9ba087f1a
# Parent  5aef5afa8654d0f32423d2b6cb51a47f3ccbe6d3

snapshot: extract parent chain computation

The final step of this series is to include chain related to "prev" in the
search. Before adding that code we do some simple code movement to clarify the
next diff.

diff --git a/mercurial/revlogutils/deltas.py b/mercurial/revlogutils/deltas.py
--- a/mercurial/revlogutils/deltas.py
+++ b/mercurial/revlogutils/deltas.py
@@ -711,8 +711,9 @@ def _rawgroups(revlog, p1, p2, cachedelt
         # search for snapshot in parents delta chain
         # map: snapshot-level: snapshot-rev
         parents_snaps = collections.defaultdict(set)
-        for p in parents:
-            for idx, s in enumerate(deltachain(p)):
+        candidate_chains = [deltachain(p) for p in parents]
+        for chain in candidate_chains:
+            for idx, s in enumerate(chain):
                 if not revlog.issnapshot(s):
                     break
                 parents_snaps[idx].add(s)