How to make only timbre.core/spy pretty print?

[ghost]

I would like to make only timbre.core/spy pretty print, but leave all other functions alone. How do I do that?

I already found the following function in #184 for use as a middleware:

(defn pretty-log [data]
  (update
    data
    :vargs
    (partial mapv #(if (string? %)
                     %
                     (with-out-str (pprint %))))))

For timbre.core/spy this is inconvenient, however, because it will also pretty print the part before =>, which is usually short and just makes the logs harder to scan when pretty printed. I assume what is necessary for timbre.core/spy is a macro wrapping it, but I was so far unable to produce one that worked.

[ptaoussanis]

Next release of Timbre will include a :spying? argument in data sent to appenders, that should make customised handling easier.