--- a/hgext3rd/evolve/rewriteutil.py	Sun Jul 23 05:42:41 2017 +0200
+++ b/hgext3rd/evolve/rewriteutil.py	Sun Jul 23 06:11:33 2017 +0200
@@ -21,6 +21,7 @@
     lock as lockmod,
     obsolete,
     phases,
+    repair,
     revset,
 )
 
@@ -77,6 +78,29 @@
     hg.update(repo, prev)
     commands.revert(ui, repo, rev=ctx.rev(), all=True)
 
+def reachablefrombookmark(repo, revs, bookmarks):
+    """filter revisions and bookmarks reachable from the given bookmark
+    yoinked from mq.py
+    """
+    repomarks = repo._bookmarks
+    if not bookmarks.issubset(repomarks):
+        raise error.Abort(_("bookmark '%s' not found") %
+                          ','.join(sorted(bookmarks - set(repomarks.keys()))))
+
+    # If the requested bookmark is not the only one pointing to a
+    # a revision we have to only delete the bookmark and not strip
+    # anything. revsets cannot detect that case.
+    nodetobookmarks = {}
+    for mark, bnode in repomarks.iteritems():
+        nodetobookmarks.setdefault(bnode, []).append(mark)
+    for marks in nodetobookmarks.values():
+        if bookmarks.issuperset(marks):
+            rsrevs = repair.stripbmrevset(repo, marks[0])
+            revs = set(revs)
+            revs.update(set(rsrevs))
+            revs = sorted(revs)
+    return repomarks, revs
+
 def rewrite(repo, old, updates, head, newbases, commitopts):
     """Return (nodeid, created) where nodeid is the identifier of the
     changeset generated by the rewrite process, and created is True if