render package:trifecta

create a drawing surface

The type for Lines will very likely change over time, to enable drawing lit up multi-character versions of control characters for ^Z, ^[, 0xff, etc. This will make for much nicer diagnostics when working with protocols.

A Rendering is a canvas of text that output can be written to.

The empty Rendering, which contains nothing at all.

>>> show (prettyRendering emptyRendering)
""

Is the Rendering empty?

>>> nullRendering emptyRendering
True

>>> nullRendering exampleRendering
False