format fields

The title, name, desc and content props may contains templating tags.

For example, the title I have {{ 2 + 1 }} documents will be rendered as I have 3 documents.

The paxpar engine use the jinja2 library.

The context properties available in the template are :

• children : the node children (self.children)
• root : the root node of the checklist in its current state (self.root)
• all props of the node

Some functions are also exposed :

• len()

TODO:

• expose node
• expose children