Yes, it was pretty artistic as far as programs linked on Hacker News go, but technically... it was just a bunch of functions and macros which produced formatted strings.

Not that it's bad on itself, but the title suggested otherwise.

Agreed. This has little to do with what their repl can do and is mostly a bunch of functions with their output.

It's "pretty" and "clever", not actually useful to actual human beings. You know how nerds can be, sometimes.