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It was on HN recently, the open source text-to-diagram tool d2 just launched an ascii output mode: https://d2lang.com/blog/ascii/

This is really close to what I wanted, thanks!

>I wish there was a way to write the "structure" and have it generate the ASCII art for that.

How would what it generates be any different than what you wrote?

He doesn't want to click and drag with his mouse. Instead he wants an input box that lets him say "make a box [30] columns wide and [4] rows tall".

Yes, exactly! Either in natural language or some DSL.

Mermaid is great for this, though the output will be an image, not ASCII.

graph-easy? It doesn't give you a lot of control though