multiline input in REPL

[codesections]

Thanks very much for your work on Gluon. I just started trying it out, but it already seems very impressive.

However, in my first few minutes playing with Gluon I've run into a basic issue. (It could well be user error and, if so, I apologize. But I didn't see anything in the Gluon Book or github issues that seemed to address this).

The issue I'm running into is that I cannot enter multiline forms in the REPL. For example, I attemtempted to type in the Fibinacci example:

let fib n =
  if n #Int< 2
  then 1
  else fib (n #Int- 1) #Int+ fib (n #Int- 2)
fib

Unfortunately, pressing Return at the end of the first line does not open a block; it provides the error error: Unexpected token: CloseBlock instead. I tried common key combinations, (Shift + Return, C-j, C-Return, etc.) but none of them opened a block either.

Am I missing something obvious here, or does the REPL not support multiline input?

[Marwes]

No, the REPL just doesn't support multiline input yet. Unsure exactly how to determine when multi line is expected vs just returning a parse error

[codesections]

Thanks for the quick reply. It's a bit disappointing to learn that the REPL doesn't allow multi-line input, but reassuring to know I wasn't missing something obvious.

Unsure exactly how to determine when multi line is expected vs just returning a parse error

I haven't looked at the code, but here's one approach: Any time the REPL encounters an unexpected CloseBlock token on a non-empty line, it should replace the CloseBlock with a newline + indentation. (This would mean that some invalid input wouldn't trigger parse errors immediately, but that seems to be an acceptable trade off – it's the same trade off shells typically make with open blocks (e.g., an open quotation mark in bash).)