template as [higher-order] functions

Many templating systems are implicit substitution semantic functions, I feel templates should be normal functions with strict and optional parameters, instead of a generic call with (template name, environment map) couple.

That's all. Emacs org-capture style nano post.

ps: the higher-order part, is that we need a way to express the formatted output as context-sensitive by embedding its surrounding as another set of parameters (which would be templating functions)