# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 1537620033 -7200
# Node ID 6335c0de80faf4b4c951e3eafa7157c5a9625aa0
# Parent  99f0f052b6bf12d6a120d178ef75a64f13b2502e
obsolete: allow multiple predecessors in createmarkers

The logic for this change is similar to the change to `cleanupnodes` that we
did earlier. Now that the rebase code is trying to record a fold, we need to
actually record it in the markers. The first step is to have the markers
creation API able to receive such fold data.

To keep things sane, we restrict fold to on successors.

diff -r 99f0f052b6bf -r 6335c0de80fa mercurial/obsolete.py
--- a/mercurial/obsolete.py	Wed Sep 26 21:03:09 2018 +0200
+++ b/mercurial/obsolete.py	Sat Sep 22 14:40:33 2018 +0200
@@ -959,7 +959,7 @@
                   operation=None):
     """Add obsolete markers between changesets in a repo
 
-    <relations> must be an iterable of (<old>, (<new>, ...)[,{metadata}])
+    <relations> must be an iterable of ((<old>,...), (<new>, ...)[,{metadata}])
     tuple. `old` and `news` are changectx. metadata is an optional dictionary
     containing metadata for this marker only. It is merged with the global
     metadata specified through the `metadata` argument of this function.
@@ -993,8 +993,14 @@
     with repo.transaction('add-obsolescence-marker') as tr:
         markerargs = []
         for rel in relations:
-            prec = rel[0]
-            if True:
+            predecessors = rel[0]
+            if not isinstance(predecessors, tuple):
+                # preserve compat with old API until all caller are migrated
+                predecessors = (predecessors,)
+            if 1 < len(predecessors) and len(rel[1]) != 1:
+                msg = 'Fold markers can only have 1 successors, not %d'
+                raise error.ProgrammingError(msg % len(rel[1]))
+            for prec in predecessors:
                 sucs = rel[1]
                 localmetadata = metadata.copy()
                 if 2 < len(rel):