error running django-admin.py build --parse-templates

[rob-b]

File "/home/vagrant/.virtualenvs/extit/local/lib/python2.7/site-packages/webassets/ext/jinja2.py", line 157, in _recurse_node
filter, output, files = node.args
ValueError: too many values to unpack

The issue is because node.args returns 4 values, the 3rd being a Const with value of None

(Pdb++) print node.args[2]
Const(value=None)

This patch fixes the issue in a backwards compatible way

--- ext/jinja2.py·  2012-05-09 12:00:30.518965070 +0000
+++ ext/jinja2.new.py·  2012-05-09 12:01:09.731791216 +0000
@@ -154,7 +154,7 @@
                         if isinstance(node, jinja2.nodes.Call):
                             if isinstance(node.node, jinja2.nodes.ExtensionAttribute)\
                            and node.node.identifier == AssetsExtension.identifier:
-                                filter, output, files = node.args
+                                (filter, output), files = node.args[0:2], node.args[-1]
                                 bundle = Bundle(
                                     *AssetsExtension.resolve_contents(files.as_const(), self.asset_env),
                                     **{ 

Now that I think about it, it's somewhat fragile as it will probably fail in an unexpected way if len(node.args) > 3 and so something like

try:
    filter, output, files = node.args
except ValueError:
   filter, output, _, files = node.args

might be better as it will fail sooner if node.args contains anything other than 3 or 4 values