Another option (though Bens does look nicer!)
(loop [xs (->> "00101110101110"
(map vector (iterate inc 1))
(filter #(= (last %) \1))
(map first))
it nil]
(let [steps (partition 2 1 xs)
[i o] (split-with in-step steps)]
(cond (every? empty? steps)
(str it (first xs))
(empty? i)
(recur (rest xs)(str it (first xs) ","))
:else (recur (last (split-at (count i) xs)) (str it (ffirst i) "-")))))
>
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