function.prototype.override.js

callLog = [];

/* set up an override for the Function call prototype
 * @param func the new function wrapper
 */
function registerOverride(func) {
   oldCall = Function.prototype.call;
   Function.prototype.call = func;
}

/* restore you to your regular programming 
 */
function removeOverride() {
   Function.prototype.call = oldCall;
}

/* a simple example override
 * nb: if you use this from the node.js REPL you'll get a lot of buffer spam
 *     as every keypress is processed through a function
 * Any useful logging would ideally compact these calls
 */
function myCall() { 
   Function.prototype.call = oldCall;
   var entry = {this:this, name:this.name, args:{}};
   for (var key in arguments) {
     if (arguments.hasOwnProperty(key)) {
      entry.args[key] = arguments[key];
     }
   }
   callLog.push(entry);
   this(arguments);
   Function.prototype.call = myCall;
}

/* example usage
 
   registerOverride(myCall);
   console.log("hello, world!");
   removeOverride(myCall);
   console.log(callLog);
 */