Hi,
I'm trying to read user input (interactive) using guile. I'd like to use
(ice-9 readline), so that the user can use backspace and history and such.
I'd also like to have a prompt at the beginning of the line. These last
two desires seem to be incompatible, at least mod my best efforts.
For instance, please consider the following:
(use-modules (ice-9 rdelim) (ice-9 format) (ice-9 readline))
(activate-readline)
(define (test)
(define str #f)
(display "prompt: ")
(let loop ((n 1000000))
(if (not (zero? n)) (loop (1- n))))
(set! str (read-line))
(newline)
(display str))
(test)
This prints "prompt: " on a line, and then after a short time, it is
erased. The mess with loop in the middle is of course a crufty time delay,
without which I can't see "prompt: " at all before it disappears. After it
has disappeared, I can type whatever I like, and then press enter.
Whatever I have typed is then printed as expected, on a new line.
This behavior is unchanged (except for how much text is actually read) when
I substitute read-char or read in for read-line.
This behavior is gone when I remove (activate-readline).
However, without readline, as I said above, the user cannot backspace,
which is a great annoyance.
Obviously, however, when the normal guile repl uses readline, it has a
prompt which is not eaten. How is this accomplished?
Regards,
Jon
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