use all non-macros from target ns in local scope

repl

phoenix.core=> (user/with-use user (+ 1 1))
2
phoenix.core=> (macroexpand-1 '(user/with-use user (+ 1 1)))
(clojure.core/let [help user/help find-name user/find-name non-macros user/non-macros src-dir user/src-dir exercise-coverage user/exercise-coverage apropos-better user/apropos-better] (+ 1 1))

util.clj

(defn non-macros                                                                
  [target-ns]                                                                   
  (map key                                                                      
       (remove #(:macro (meta (val %)))                                         
               (ns-publics target-ns))))                                        
                                                                                
(defmacro with-use                                                              
  [target-ns & body]                                                            
  `(let ~(into []                                                               
               (mapcat (juxt identity (fn [s] (symbol (name target-ns) (name s))))
                       (non-macros target-ns)))                                 
     ~@body))