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

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1585148832 -32400
#      Thu Mar 26 00:07:12 2020 +0900
# Node ID 04ec1c9dd3ead2d90a6e4c43d3f9500a5da4a409
# Parent  496868f1030c695db7c68ed5ff558cbbb7ee4b88
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.

diff --git a/mercurial/templatefilters.py b/mercurial/templatefilters.py
--- a/mercurial/templatefilters.py
+++ b/mercurial/templatefilters.py
@@ -106,12 +106,17 @@ 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)
+    # cborutil is stricter about type than json() filter
+    obj = pycompat.rapply(_tocborencodable, obj)
     return b''.join(cborutil.streamencode(obj))
 
 
diff --git a/tests/test-template-functions.t b/tests/test-template-functions.t
--- a/tests/test-template-functions.t
+++ b/tests/test-template-functions.t
@@ -1616,6 +1616,15 @@ 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 "{'<foo at example.org>'|json}\n" -R a -l1