> (let [basedir (if-let [bdir (:basedir *locs)] bdir ".")]
> ...)
I'd personally write that as:
(let [basedir (or (:basedir *locs*) ".")]
...)
There is also when-let, which can be used to iterate over sequences:
(loop [items some-sequence]
(when-let [item (first items)]
(do something)
(recur (rest items))))
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