Input without pressing "Enter" in Lisp?

andrw123 · 10-13-2008, 11:47 PM

Is there a way I can get user input without having the user press the "Enter" key?

For example, say I give the user a menu with a single character representing each option, they could just press the single key and Lisp will accept the character. They would not have to press "Enter" afterwards.

I know there is a way to do this in C, but I am still new to Lisp and I couldn't find anything on how to do it.

By the way I am using the "CLISP" interpreter.

Thanks in advance.

ntubski · 10-14-2008, 11:00 PM

CLISP has a built-in interface to curses (or equivalent on windows):
http://clisp.cons.org/impnotes.html#screen

quick example:

Code:

(with-open-stream (wnd (screen:make-window))
  (ext:with-keyboard t ; the t is to make emacs indent nicer
    (format t "press any key: ")
    (format t "~%you entered '~a'~%"
            (character (read-char ext:*keyboard-input*)))))

andrw123 · 10-15-2008, 12:12 AM

Quote:

Originally Posted by ntubski

CLISP has a built-in interface to curses (or equivalent on windows):
http://clisp.cons.org/impnotes.html#screen

quick example:

Code:

(with-open-stream (wnd (screen:make-window))
  (ext:with-keyboard t ; the t is to make emacs indent nicer
    (format t "press any key: ")
    (format t "~%you entered '~a'~%"
            (character (read-char ext:*keyboard-input*)))))

Wow, I had no idea. More stuff to play with.

Thanks,
Andrew