I noticed that core doesn't have a "children" function for
hierarchies, although it has "parents", "descendants", and
"ancestors". Here's one:
(defn children
([tag]
(set (filter (fn [t] (contains? (parents t) tag))
(descendants tag))))
([h tag]
(set (filter (fn [t] (contains? (parents h t) tag))
(descendants h tag)))))
The repetition is necessary because clojure.core/global-hierarchy is
private.
-Stuart Sierra
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