graphlog: add a way to test the 'groupbranchiter' function We add an experimental config option to use the topological sorting. I first tried to hook the 'groupbranchiter' function in the 'sort' revset but this was useless because graphlog enforces revision number sorting :( As the goal is to advance on the topological iteration logic, I see this experimental option as a good way to move forward. We have to use turn the iterator into a list because the graphlog is apparently not ready for pure iterator input yet.

--- a/mercurial/graphmod.py	Thu Sep 04 18:19:32 2014 +0200
+++ b/mercurial/graphmod.py	Fri Nov 14 17:37:59 2014 +0000
@@ -199,6 +199,9 @@
     lowestrev = revs.min()
     gpcache = {}
 
+    if repo.ui.configbool('experimental', 'graph-topological', False):
+        revs = list(groupbranchiter(revs, repo.changelog.parentrevs))
+
     for rev in revs:
         ctx = repo[rev]
         parents = sorted(set([p.rev() for p in ctx.parents()