On Sun, May 23, 2021 at 12:20 AM <xxxxxx@ancell-ent.com> wrote:
>
> The (not ...) option for stty also falls to the "let's keep it simple" principle.
>
> The trouble with using `-canon` is that in R6RS it will have to be written `\u2D;canon`, which is grotesque.  So the simplest thing that can work will be (- canon).
>
> I'm not getting the point you're making unless this pertains to the Chibi Scheme stty (not ...) option, which I've discarded as being overly complicated for both the user and implementor.

You need to be able to turn terminal attributes off as well as on.
For example, (not echo) disables echoing and is essential for
many applications including editor functionality. You could replace
the generalized (not ...) form with individually inverted attribute
names, e.g. to match the stty(1) command usage -echo to disable
echoing, but as John points out, while this is a valid R7RS
identifier it would need to be escaped in R6RS.

I think the (chibi stty) approach is fine, but if you want the -echo
approach maybe a no- prefix is better, e.g. `no-echo`.

--
Alex