# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@logilab.fr>
# Date 2012-07-17 15:31:29
# Node ID 7eb5aa1f83fd175dcb8e23de46547ce545b3e20f
# Parent  246131d670c263d8006371b71dc56841ea7f3551

obsolete: add an any successors function

This function yield every nodes which succeed to a group of nodes.

The first user will be checkheads who need to know if we push successors for
remote extra heads.

diff --git a/mercurial/obsolete.py b/mercurial/obsolete.py
--- a/mercurial/obsolete.py
+++ b/mercurial/obsolete.py
@@ -285,3 +285,17 @@ def successormarkers(ctx):
     for data in ctx._repo.obsstore.successors.get(ctx.node(), ()):
         yield marker(ctx._repo, data)
 
+def anysuccessors(obsstore, node):
+    """Yield every successor of <node>
+
+    This this a linear yield unsuitable to detect splitted changeset."""
+    remaining = set([node])
+    seen = set(remaining)
+    while remaining:
+        current = remaining.pop()
+        yield current
+        for mark in obsstore.precursors.get(current, ()):
+            for suc in mark[1]:
+                if suc not in seen:
+                    seen.add(suc)
+                    remaining.add(suc)