I think it's easier to think about combining predicates separately
from your file-filtering code. I'd use a higher-order function like
the following
(defn combine-preds
[& preds]
(fn [& args] (every? #(apply % args) preds)))
I've noticed that most uses of this kind of thing are for fixed sets
of predicates, and almost always for two, so I'd define:
(defmacro both [p1 p2]
`(fn [& args#]
(and (apply ~p1 args#)
(apply ~p2 args#))))
Which reads nicely:
(filter (both number? even?) (range 1 7))
and is probably more efficient (not that I've tested it).
You can generalize this to `all`, of course.
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