Hi colleagues, I'm trying to figure out how to build a couple of threading macros that would be very helpful in Max/MSP for Scheme for Max, but it is frankly over my head right now. Working it out will be a good exercise but I figured I would post here in case this is trivial for some macro experts in S7 and they are willing to share something I can study.
I want to implement something like srfi-197, where it is called "chain". (but srfi-197 uses syntax-case and syntax-rules) so from the docs there: (chain x (a b _)) ; => (a b x) (chain (a b) (c _ d) (e f _)) ; => (let* ((x (a b)) (x (c x d))) (e f x)) (chain (a) (b _ _) (c _)) ; => (let*-values (((x1 x2) (a)) ((x) (b x1 x2))) (c x)) But what I'd really to make on top of that is a version for allows one to use this for one liners in Max without inner parens, so something like this, where the macro is ~> (x ~> a _ b ~> c _ ) becomes something equivalent of: (c (a (eval x) b)) Because Scheme for Max will take a max message and treat it as code to be wrapped in outer parens and then eval'd, this will let people do very useful things in one short max message (where say $i and $i2 come from another max message sending to it: $i1 ~> + 10 _ ~> / $i2 _ If anyone has suggestions or feels like helping that would be amazing. thanks!
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