So, in janet, bindings are stored in an environment (which is attached to a fiber, but more on that another day). Because Janet bindings contain a :source-map entry, you can use this to write an edit macro to allow you to open the file a function is contained in.

Feel free to add this to your profile.janet

    
(def EDITOR "kate")

(defmacro edit
    "Won't work for everything, but should work for installed libraries"
    [symb] 
    
    
    ~(if-let [
              source-map (-> (dyn (quote ,symb)) (get :source-map))
              [loc line char] source-map
              finfo (os/stat loc)
              _is_file (= (finfo :mode) :file)
              ]
        (os/shell (string EDITOR " " loc))
        (print "Couldn't find a file to edit for " (string ,symb))
    )
)