How to find unused template variables in Django

Question

I'm doing clean up on django code - my IDE can easily detect unused variables etc in Python code, but I haven't found a way to find unused template variables - it would be much easier to clean up the view code if I could find out what values in the context dictionary are not accessed by the templates.

Is there a tool for this?

EDIT: I am looking for an offline solution, a static code analysis tool or such. While the paranoid templates solution suggested below is better than nothing, it is not optimal because there are multiple {% if ... %} branches in templates and futhermore, would require testing all the views (in all use cases) in order to find all the unreferenced variables.

Answer 1

Try paranoid django templates solution:

class ParanoidContextProxy(object):
    """
    This is a poor-man's proxy for a context instance.

    Make sure template rendering stops immediately on a KeyError.
    """
    def __init__(self, context):
        self.context = context
        self.seen_keys = set()

    def __getitem__(self, key):
        self.seen_keys.add(key)
        try:
            return self.context[key]
        except KeyError:
            raise ParanoidKeyError('ParanoidKeyError: %r' % (key,))

    def __getattr__(self, name):
        return getattr(self.context, name)
    def __setitem__(self, key, value):
        self.context[key] = value
    def __delitem__(self, key):
        del self.context[key]