I haven't tested the following with Racket 5.x, but either they'll work
or give you some idea of how easy the FFI makes many things:
http://groups.google.com/group/plt-scheme/browse_frm/thread/5c415000093f90ef/68f322eedcdb4dff?hl=en&lnk=gst&q=curses#68f322eedcdb4dff
Note: There is also a "curses.c" in Racket 5.0.1
"collects/mzscheme/examples/". This uses a ``C extension'' instead of
the FFI. I suggest using the FFI instead of a C extension, so that you
can work in Racket code only and won't have to build or maintain C code.
Writing "curses" bindings is a popular recreational activity, and I'd
bet that multiple people have done it for the FFI, but perhaps someone
can spoil everyone else's fun by putting pre-made "curses" bindings into
PLaneT.
Neil Van Dyke wrote at 09/21/2010 02:11 AM:
Isaiah Gilliland wrote at 09/21/2010 01:16 AM:
I was wanting to see if there was at all a way to do asynchronous
input from a keyboard in racket. Kinda like tcp-listen, that won't
freeze up the program while it's used, and won't show in the terminal.
I'm going to assume you're on something Unix-y.
A C library called "curses" is most often used for this sort of
interface. In addition to unbuffered keyboard input and disabling
echo, it will take care of moving the cursor around, and a bunch of
other things. Perhaps most importantly, it will insulate you from a
lot of terminal control languages and quirks that you had no idea
existed, some of which you'd otherwise bump into eventually.
There are other libraries and approaches at lower levels, but I
suspect that "curses" is what you want.
People have made FFI bindings from Racket to "curses" in the past, but
I don't see any in PLaneT right now.
If you don't quickly find bindings to "curses", you can make them
yourself pretty quickly. Or even make only the bindings you need,
adding them as you need them, since the FFI makes that really easy.
--
http://www.neilvandyke.org/
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