weavejester / decorate

Clojure macros for decorating functions

This is a small library for Compojure that allows defined functions to be enhanced by decorator functions.

For example, here is a logging decorator function:

(defn wrap-logging [func desc]
  (fn [& args]
    (prn "Entering" desc)
    (apply func args)
    (prn "Leaving" desc)))

You can apply it to an existing function with the decorate macro:

(decorate handle-request
  (wrap-logging "request handler"))

This will redefine the handle-request function, keeping the metadata intact.

The decorate library provides four macros:

(redef name value) - redefine a var without losing its metadata.

(decorate func & decorators) - wrap a single function in one or more decorators.

(decorate-with decorator & funcs) - wrap many functions in the same decorator.

(decorate-bind decorator funcs & body) - wrap many functions in same decorator for a bounded scope.