If you're on a Unix, like GNU/Linux or a BSD, you could use the
`charterm` package:
#lang racket/base
(require charterm)
(with-charterm
(let-values (((w h) (charterm-screen-size)))
(charterm-clear-screen)
(charterm-display "Width: " w " Height: " h " ")
(charterm-cursor 1 2)))
`charterm` can probably also do the other things you mentioned. See the
demo program that the documentation mentions.
https://www.neilvandyke.org/racket/charterm/
You mentioned `less`. If you want to be able to scroll backwards
vertically one line at a time, like `less` can, without redrawing the
screen, then you might want to use `charterm-insert-line`. (This will
probably work for any terminal you have today. It probably won't work
on terminal emulators that are set to strict "VT-100" emulation, but it
should work with later VT model emulation and "ANSI".)
I haven't been developing `charterm` since I originally wrote it, so
some things are relatively over-engineered, while other things are
missing or could be improved. If `charterm` doesn't do what you want, I
see two other interesting packages to look at:
https://pkgs.racket-lang.org/package/termios
https://pkgs.racket-lang.org/package/ansi
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