[crdoconnor]

Any particular reason to use this over YAML for configuration?

[TillE]

Macros seem to be the key distinguishing feature. It's a good idea, sort of borrowing from template engines.

[crdoconnor]

Sure, but why not use a well known and solid templating engine if you're going to do templating?

Ansible combines YAML with jinja2 to do this type of stuff, for instance.

I'm not totally certain, but I think that might end up being simpler, more expressive and more powerful than this.