[Help] Is it possible to evaluate attributes of an object lazy at runtime via a callback e.g.

[sassman]

in the docs there is:

. / []: Get an attribute of an object.

I wonder if there is a way to somehow lazy (e.g. similar to add_function) evaluate attributes of an object.
So that I could write something like below, to refer to the equivalent of std::env::var("USER"):

{{ env.USER }}

So the main thing I'd like to achieve is not to have to pre-allocate an object env with all the attributes that are the actual process environment variables. I know that registering a HashMap would actually work.

[sassman]

I just came across this: #160 (comment)
It might be possible to solve the use case by a custom StructObject impl where get_field could take care of it, right?

[mitsuhiko]

Correcty, you can implement your own StructObject. You find an example here: https://github.com/mitsuhiko/minijinja/blob/main/examples/load-lazy/src/main.rs

[sassman]

Thanks, works like charm.