log-opts (bunyan helper)

log-opts.cljs

(defn log-opts [logger level msg & params]
  (let [amap (apply array-map params)
        expected (count (re-seq #"%s|%d|%j" msg))
        args (flatten [amap msg (if (not (empty? amap)) (take expected (vals amap)))])]
    (.apply (aget logger level) logger (clj->js (remove nil? args)))))

It can be used like so:

(log-opts logger "info" "A static message." :some-key some-val :another-one another-val)
(log-opts logger "info" "Formatted message: %s" :a-key a-val)

There can be more key/value pairs provided than placeholders in the formatted message (extras are just dropped as format params but still provided as part of options object for Bunyan to produce JSON from).