dispacio <https://github.com/johnmn3/dispacio#function-extension> has a 
shadow-extend-like capability:

(defp assoc string? [s i c] (str (subs s 0 i) c (subs s (inc i))))

And then

(assoc "abc" 2 'x);#_=> "abx"

Using alter-var-root in dispacio correctly would prevent var replacement 
warnings I believe, similar to s/instrument, but I haven't figured out how 
to do it yet in a cross-platform way. PRs welcome. 

V/r

John
On Saturday, January 19, 2019 at 9:58:29 AM UTC-5, Janko Muzykant wrote:
>
> Hi,
>
> Is there an way to replace body of existing (interned) function with own 
> code still being able to call original fn? 
> Suppose, I have a function:
>
>     (defn fetch-data [arg1 arg2]
>       (db/fetch-data ...))
>
> I would like to intern a slightly modified version of this fn. Something 
> like this:
>
>     (defn fetch-data [& args]
>       (let [result (apply original-fetch-data args)]
>         (transform-result result)))
>
> The problem I see is how to keep the reference to original fetch-data fn 
> (here denoted by original-fetch-data),
> so it could be still called in a altered version of fetch-data function.
>
> Best,
> JM.
>
>
>
>

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