[kiitos]

So the purpose of the tool is to transform an ASCII diagram to a Unicode diagram? I struggle to understand the value of such a thing.

    +---+   +---+
    | A |-->| B |
    +---+   +---+

is actually better than

    ┌─┐ ┌─┐
    │A│→│B│
    └─┘ └─┘

because it can be manipulated without external tools. Right?