One variation making the lazy-sequence only over the pieces:
(defn split-at-subsequence [mark input]
(let [len (count mark)
split-at-subseq (fn split-at-subseq [pieces]
(when (seq pieces)
(let [[fst rst] (split-with #(not= mark
%) pieces)
head (map first fst)
rst-pieces (drop len rst)
tail (lazy-seq
(split-at-subseq rst-pieces))]
(if (empty? head)
tail
(list* head tail)))))]
(when-let [sequence (seq input)]
(split-at-subseq (partition-all len 1 sequence)))))
I suppose it is better to define a private function for the computation of
the lazy-sequence than define it inside the let.
Juan Manuel
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