Is it possible to get template information?

[regnerisch]

Is it possible to get template information e.g. used variables / blocks and more?

Something like nunjucks.parse('/path/to/template') with an output of {variables: ['abc', 'efg'], blocks: ['my_block']} would be very usefull. Did not find something like this in the docs. May somebody can help me here.

[fdintino]

Closing this in favor of #1153, so we have a single issue to track this request.