[PATCH 1 of 2] hg/repository: add subrepos method

[Angel Ezquerra]

# HG changeset patch
# User Angel Ezquerra <angel.ezquerra at gmail.com>
# Date 1456709709 -3600
#      Mon Feb 29 02:35:09 2016 +0100
# Branch stable
# Node ID e16bf58e69344c32cfec314efe6d27cd77596e59
# Parent  1c060576ac430bc9503cff6f8cbc1b4e0329b57f
hg/repository: add subrepos method

This new method returns a (sorted) list of subrepository paths that are refered
to by a given set of revisions. If no revisions are specified the current
repository heads are used by default.

diff --git a/kallithea/lib/vcs/backends/hg/repository.py b/kallithea/lib/vcs/backends/hg/repository.py
--- a/kallithea/lib/vcs/backends/hg/repository.py
+++ b/kallithea/lib/vcs/backends/hg/repository.py
@@ -227,6 +227,19 @@
                  self._repo._bookmarks.items()]
         return OrderedDict(sorted(_bookmarks, key=sortkey, reverse=True))
 
+    def subrepos(self, revs=None):
+        """
+        Gets subrepo paths referenced by any of the selected revisions
+
+        Subrepo paths are returned relative to the root of the repository
+        """
+        if revs is None:
+            revs = self._repo.heads()
+        subpaths = set()
+        for r in revs:
+            subpaths = subpaths.union(set(self._repo[r].substate.keys()))
+        return sorted(list(subpaths))
+
     def _get_all_revisions(self):
 
         return [self._repo[x].hex() for x in self._repo.filtered('visible').changelog.revs()]
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