Handle nesting of markup functions

[asnewman]

If you have a function that generates markup, it needs context to its nesting level where it is called from. For example:

-div()
${generateHelloMessage()}

In this case, generateHelloMessage() needs to have a root nesting of 2 dashes, like so::

function generateHelloMessage() {
	return `
		--p()
		---"Hello world"
	`
}

Because of this, now generateHelloMessage() cannot be used in different nesting scenarios. For example:

-div()
${generateHelloMessage()}
--div()
${generateHelloMessage()} <-- will generate incorrect nesting

For this reason, it would be better if generator functions like this don't need to be aware of nesting level, and instead, the caller signifies that anything under it is a child. Something like this:

-div() {
	${generateHelloMessage()}
}
--div() {
	${generateHelloMessage()}
}

...

function generateHelloMessage() {
	return `
		-p()
		--"Hello world"
	`
}

This would automatically add appropriate nesting to the generated markup.