templater: introduce wrapper for smartset (API) I want to add a template function which takes a revset as an argument: {somefunc(..., revset(...))} ^^^^^^^^^^^ evaluates to a revslist This wrapper will provide a method to get an underlying smartset. It should also be good for performance since count(revset(...)) will no longer have to fully consume the smartset for example, but that isn't the point of this change.

--- a/mercurial/templater.py	Fri Mar 20 23:30:23 2020 -0400
+++ b/mercurial/templater.py	Sun Mar 15 15:12:44 2020 +0900
@@ -45,6 +45,9 @@
 hybriditem
     represents a scalar printable value, also supports % operator.
 
+revslist
+    represents a list of revision numbers.
+
 mappinggenerator, mappinglist
     represents mappings (i.e. a list of dicts), which may have default
     output format.