// Trigger an event and a corresponding method name. Examples:
//
// `this.triggerMethod("foo")` will trigger the "foo" event and
// call the "onFoo" method. 
//
// `this.triggerMethod("foo:bar") will trigger the "foo:bar" event and
// call the "onFooBar" method.
Marionette.triggerMethod = (function(){
  
  // split the event name on the :
  var splitter = /(^|:)(\w)/gi;

// take the event section ("section1:section2:section3")
  // and turn it in to uppercase name
  function getEventName(match, prefix, eventName) { 
    return eventName.toUpperCase();
  }

// actual triggerMethod name
  var triggerMethod = function(event) {
    // get the method name from the event name
    var methodName = 'on' + event.replace(splitter, getEventName);
    var method = this[methodName];

// trigger the event
    this.trigger.apply(this, arguments);

// call the onMethodName if it exists
    if (_.isFunction(method)) {
      // pass all arguments, except the event name
      return method.apply(this, _.tail(arguments));
    }
  };

return triggerMethod;
})();

triggermethod.js

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