--- a/mercurial/templater.py	Tue Feb 11 21:10:00 2014 -0800
+++ b/mercurial/templater.py	Tue Feb 11 21:04:12 2014 -0800
@@ -7,7 +7,7 @@
 
 from i18n import _
 import sys, os, re
-import util, config, templatefilters, parser, error
+import util, config, templatefilters, templatekw, parser, error
 import types
 import minirst
 
@@ -356,6 +356,32 @@
     # ignore args[0] (the label string) since this is supposed to be a a no-op
     yield _evalifliteral(args[1], context, mapping)
 
+def revset(context, mapping, args):
+    """usage: revset(query[, formatargs...])
+    """
+    if not len(args) > 0:
+        # i18n: "revset" is a keyword
+        raise error.ParseError(_("revset expects one or more arguments"))
+
+    raw = args[0][1]
+    ctx = mapping['ctx']
+    repo = ctx._repo
+
+    if len(args) > 1:
+        formatargs = list([a[0](context, mapping, a[1]) for a in args[1:]])
+        revs = repo.revs(raw, *formatargs)
+        revs = list([str(r) for r in revs])
+    else:
+        revsetcache = mapping['cache'].setdefault("revsetcache", {})
+        if raw in revsetcache:
+            revs = revsetcache[raw]
+        else:
+            revs = repo.revs(raw)
+            revs = list([str(r) for r in revs])
+            revsetcache[raw] = revs
+
+    return templatekw.showlist("revision", revs, **mapping)
+
 def rstdoc(context, mapping, args):
     if len(args) != 2:
         # i18n: "rstdoc" is a keyword
@@ -454,6 +480,7 @@
     "join": join,
     "label": label,
     "pad": pad,
+    "revset": revset,
     "rstdoc": rstdoc,
     "shortest": shortest,
     "strip": strip,