Features

Already implemented

padding
padding in columns
padding in rows
orientation of padding for cell content: specify as left or right padding, resulting in left or right alignment of content of cells
specify characters used for display
character for intersection specifiable
character for emptyness can be configured
character for row separation
character for column separation

Wanted

arbitrary content

The idea is to use arbitrary strings as contents for grids, even if the strings itself are grids, so that one can have arbitrary nesting of grids.

How would one go about implementing it?

find the longest line of the inner grid
make cells of the width of the inner grid plus any padding or margin