Here's my take using my clj-iter (http://github.com/nathell/clj-iter):
(defn partition-when
[pred coll]
(iter (for x in coll)
(for p = (when x (pred x)))
(for y initially () then (if p (list x) (cons x y)))
(collect (reverse y) if p)
(finally-collect (reverse y))))
Hopefully it's readable.
Best,
Daniel
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