namespaces - Clojure - how to let the library users choose which printing function to use, to display data structures? -

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I am writing a small debugging library and I want to let users choose how to display data structures. I was imagining that users may need it like this: 

  (ns some-user-namespace (: [requires clojure.pprint] [my.library: With-args {print-   
 Is this possible, and if not, how can I solve this problem   
 
 
 It is not possible to do this in such a way that if you actually offer such an installation, you can call the user The configuration function can be provided:  
  (ns some namespace (requires: [my.library])   
 !   This is an idiomatic method of pointing out that it is creating some side effect.  
 In your library it can appear:  
  (ns my.library) (defconfig (atom {: printer println})) (defn print-with [New-printer] (swap! Config assoc: printer new-printer)) (my-lib -print [foo] defin ((:: printer @ config) foo))   
  edit : a solution For those who do not require global, unstable state, you can use dynamic binding.  
 Lib:  
  (ns my.library) (def ^: dynamic * printer * println) (my-lib-print [foo] (* printer * foo) Cancel)   
 Usage:  
  (binding [my.library/ * printer * clojure.pprint / pprint] (my.library / my- Lib-print {hello "world"}))   
 
 These are only for two types of external, relevant configurations which I can think of is the pure high order function :  
  (my-lib-print [printer foo] (printer fu) defn)

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