templater: fix cbor() filter to recursively convert smartset to list

The previous attempt, e3e44e6e7245 "templater: fix cbor() filter to accept
smartset", was incomplete since obj may be a collection containing a smartset.

This works around the problem by converting smartsets recursively. Another
option is to teach cborutil how to encode a smartset. That should be okay,
but I hesitated to add "import smartset" to cborutil.py as the cborutil is
pretty generic.

mercurial/templatefilters.py

@@ -106,12 +106,17 b' def basename(path):'
     return os.path.basename(path)
 
 
+def _tocborencodable(obj):
+    if isinstance(obj, smartset.abstractsmartset):
+        return list(obj)
+    return obj
+
+
 @templatefilter(b'cbor')
 def cbor(obj):
     """Any object. Serializes the object to CBOR bytes."""
-    if isinstance(obj, smartset.abstractsmartset):
         # cborutil is stricter about type than json() filter
-        obj = list(obj)
+    obj = pycompat.rapply(_tocborencodable, obj)
     return b''.join(cborutil.streamencode(obj))
 
 

tests/test-template-functions.t

@@ -1616,6 +1616,15 b' Test cbor filter:'
    ]
   ]
 
+  $ hg log -T "{dict(foo=revset('.'))|cbor}" -R a -l1 | "$PYTHON" "$TESTTMP/decodecbor.py"
+  [
+   {
+    'foo': [
+     10
+    ]
+   }
+  ]
+
 json filter should escape HTML tags so that the output can be embedded in hgweb:
 
   $ hg log -T "{'<[e-mail]>'|json}\n" -R a -l1