Setting language with #lang in the REPL

Question

I would like to set the language in the REPL on the fly, with #lang, not using \"-I\" command-line argument. But this gives me the error \"read: #lang not enabled i

Answer 1

; foo.rkt
#lang whatever
"hi"

is basically the same as

(module foo whatever
  "hi")

So as a quick hack you could probably slice off the #lang line, grab the lang out of it, and stuff the rest of the buffer inside of the (module ...) form before comint-send-input-ing it.

Even easier, if you don't mind saving the buffer to disk, first: Just send over ,enter /path/to/file.rkt to the REPL buffer, or if you're not using XREPL, (enter! "/path/to/file.rkt").

Also, it's worth mentioning a few Racket-related modes:

• Geiser
• Quack
• racket-mode (I'm guilty for this one)

One of them might already do what you want, or, you could peek into how they work (each takes a somewhat different approach to this).