[Texmacs-dev] Dialogues (for real scheme hackers)

[Joris van der Hoeven]

Hi all,

On the CVS version of TeXmacs, you find a new facility for
asynchronous interactive dialogues with the user,
based on continuations. For instance, you may try to
execute the following test function:

-------------------------------------------------
(define (dialogue-test)
  (dialogue
    (display* "Blah blah blah\n")
    (display* "First square: "
              (square (string->number (dialogue-ask "First number")))
              "\n")
    (interactive hi)
    (while (== (dialogue-ask "Continue?") "yes") (noop))
    (delayed (:pause 2000))
    (display* "Second square: "
              (square (string->number (dialogue-ask "Second number")))
              "\n")
    (display* "Blah blah blah\n")))
-------------------------------------------------

Due to lack of time, the facility is not yet 100% satisfactory,
so there might be a volunteer for helping on the following issues:
  1) Nested dialogues.
  2) Better error reporting using lazy-catch.
If these points are solved (mainly 2), then I could encapsulate
any menu, keyboard and other interactive actions into dialogues.

Best wishes, Joris