[gambit-list] How use (read-char) to read individual characters from the console?
mikael.rcv at gmail.com
Wed Jan 2 18:05:26 EST 2013
Here's a read-char suitable for console games etc. .
(tty-mode-set! (repl-input-port) #t #f #t #f 0)
(let ((c (read-char)))
(tty-mode-set! (repl-input-port) #t #t #f #f 0)
(if (eq? c #\x) (raise "Escape to REPL")) ; CTRL-C replacement
A version 2 of it would be to make it handle ctrl+c appropriately,
currently that throws the console into a state as per the previous email.
> Aha neat!
> Just for reference to anyone who may want to use this to make a nice
> console-based Tetris etc., while in this tty mode repl-input-port *cannot*
> be used to drive the REPL. Though, it is ctrl+c sensitive.
> Using the REPL in this mode does not do eval when pressing enter anymore,
> does not echo input, and when using any arrow keys shows:
> > *** ERROR IN (console)@8.1 -- Illegal character: #\esc
> So here's a nice example of 'clean' use of this feature:
> > (begin (tty-mode-set! (repl-input-port) #t #f #t #f 0) (write
> (read-char)) (force-output) (write (read-char)) (force-output)(write
> (read-char)) (force-output)(write (read-char)) (force-output)(write
> (read-char)) (force-output)(write (read-char)) (force-output)
> (tty-mode-set! (repl-input-port) #t #t #f #f 0))
> Rather for completeness, how can add hooks to the switching of activity
> from the user code to Gambit REPL (on CTRL+C or exception) and back (by ,c)?
> By adding hooks to that that switch the TTY between read-char-friendly
> mode and REPL-friendly, people can also debug their console-based
> Tetris:es nicely.
> With warm regards,
> 2013/1/2 Marc Feeley <feeley at iro.umontreal.ca>
>> Mikael, you need to change the tty mode :
>> > (tty-mode-set! (repl-input-port) #t #f #t #f 0)
>> The booleans indicate various settings (ctrl-c handling, input echo, raw
>> input, raw output).
>> On UNIX, this changes the terminal's line discipline. On Windows, it
>> changes the console mode.
>> On 2013-01-02, at 11:59 AM, Mikael <mikael.rcv at gmail.com> wrote:
>> > Hi,
>> > In using read-char I get results only on a per input line basis. I was
>> trying to switch the input console to byte/character mode instead of line
>> buffered, though I didn't get any result with this.
>> > Any thought or suggestion?
>> > Mikael
>> > _______________________________________________
>> > Gambit-list mailing list
>> > Gambit-list at iro.umontreal.ca
>> > https://webmail.iro.umontreal.ca/mailman/listinfo/gambit-list
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