Maybe this version is clearer:
(defn split-at-subsequence [mark input]
(when-let [sequence (seq input)]
(let [len (count mark)
pieces (partition-all len 1 sequence)
[fst rst] (split-with #(not= mark %) pieces)
head (map first fst)
rst-input (map first (drop len rst))
tail (lazy-seq (split-at-subsequence mark rst-input))]
(if (empty? head)
tail
(list* head tail)))))
I think it would be better to create the lazy-seq over a function that uses
the pieces in order to not to explode input with partition-all and
de-explode it with map-first before the recursive call.
Juan Manuel
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