edtris/waltz/macros.fnl

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; (q X) -> q(X)
; (q :x) -> q(x)
; [(q X) (p X)] -> q(X) :- p(X)
(fn clause [c]
(match c
(where [:unquote expr] (list? c)) `[:const ,expr]
(where [name & params] (list? c)) `[:literal ,(tostring name) ,(icollect [_ param (ipairs params)] (clause param))]
(where [head & tail] (sequence? c)) `[:clause ,(clause head) ,(icollect [_ elem (ipairs tail)] (clause elem))]
(where v (sym? c)) `[:var ,(tostring v)]
_ `[:const ,c]))
(fn clauses [...]
(icollect [_ c (ipairs [...]) :into `(values)] (clause c)))
{: clause : clauses :$ clauses}