Add utility for sending wrapped things in js_preload.

r2/r2/lib/pages/things.py

@@ -232,3 +232,14 @@ def wrap_links(links, wrapper = default_thing_wrapper(),
     return l.listing()
 
 
+def wrap_things(*things):
+    """Instantiate Wrapped for each thing, calling add_props if available."""
+    if not things:
+        return []
+
+    wrapped = [Wrapped(thing) for thing in things]
+    if hasattr(things[0], 'add_props'):
+        # assume all things are of the same type and use the first thing's
+        # add_props to process the list.
+        things[0].add_props(c.user, wrapped)
+    return wrapped

r2/r2/lib/template_helpers.py

@@ -168,6 +168,12 @@ class JSPreload(js.DataSource):
     def set(self, url, data):
         self.data[url] = data
 
+    def set_wrapped(self, url, wrapped):
+        from r2.lib.pages.things import wrap_things
+        if not isinstance(wrapped, Wrapped):
+            wrapped = wrap_things(wrapped)[0]
+        self.data[url] = wrapped.render_nocache('', style='api').finalize()
+
     def use(self):
         hooks.get_hook("js_preload.use").call(js_preload=self)