refers to all public vars of ns, subject to filters. filters can include at most one each of:
:exclude list-of-symbols :only list-of-symbols :rename map-of-fromsymbol-tosymbol
For each public interned var in the namespace named by the symbol, adds a mapping from the name of the var to the var to the current namespace. Throws an exception if name is already mapped to something else in the current namespace. Filters can be used to select a subset, via inclusion or exclusion, or to provide a mapping to a symbol different from the var's name, in order to prevent clashes. Use :use in the ns macro in preference to calling this directly.
; clojure/core.clj:2406 (defn refer [ns-sym & filters] (let [ns (or (find-ns ns-sym) (throw (new Exception (str "No namespace: " ns-sym)))) fs (apply hash-map filters) nspublics (ns-publics ns) rename (or (:rename fs) {}) exclude (set (:exclude fs)) to-do (or (:only fs) (keys nspublics))] (doseq [sym to-do] (when-not (exclude sym) (let [v (nspublics sym)] (when-not v (throw (new java.lang.IllegalAccessError (str sym " is not public")))) (. *ns* (refer (or (rename sym) sym) v)))))))
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