pubsub implementation with data passing and sticky events

e.js

/**
 * Pubsub event management
 * Dependencies: none
 * Autor: Karol Kowalski
 * Repo: https://gist.github.com/3761754
*/

(function(host) {

    var events = {},

        event_exists = function(event_name) {
            return !!events[event_name];
        },

        for_all_subscribers = function(event_name, fn) {
            if (event_exists(event_name)) {
                var objs = events[event_name];
                for (var i=0, l=objs.length; i<l; i++) {
                    fn(objs[i], objs, i);
                }
            }
        },

        create_if_none = function(event_name, cfg) {

            event_exists(event_name) || (events[event_name] = []);
            cfg && cfg.sticky && (events[event_name].sticky = true);
            cfg && cfg.data && (events[event_name].data = cfg.data);

        },

        dispatch_event = function(event_name, cfg) {

          cfg && cfg.sticky && create_if_none(event_name, cfg);
          for_all_subscribers(event_name,
            function(subscriber) {
              trigger(event_name, subscriber, (cfg && cfg.data));
            });

        },

        bind = function(event_name, fn) {

            create_if_none(event_name)
            events[event_name].push(fn);
            //if event is sticky it will be dispatch every time object subscribes to this
            //just for this object
            events[event_name].sticky && trigger(event_name, fn, events[event_name].data);

        },

        bind_once = function(event_name, fn) {
            var already_subscribed = false;
            for_all_subscribers(event_name,
                                function(subscriber, all_subscribers, index) {
                                    if (subscriber === fn) {
                                        already_subscribed = true;
                                    }
                                });
            already_subscribed || bind(event_name, fn);
        },

        trigger = function(event_name, fn, args) {
          var apply_args = [{type:event_name}].concat(args);
          fn.apply(host, apply_args);
        },

        unbind = function(event_name, fn) {
        for_all_subscribers(event_name,
                            function(subscriber, all_subscribers, index) {
                                if (subscriber === fn) {
                                    all_subscribers.splice(index,1);
                                }
                            });
        };

    host.E = {

        publish: dispatch_event,
        pub: dispatch_event,

        unsubscribe: unbind,
        unsub: unbind,

        subscribe: bind,
        subscribeUnique: bind_once,
        sub: bind,
        subUnique: bind_once,

        //peek into events
        __events__: events

    };

})(self);

e.min.js

(function(d){var c={},g=function(a,b){if(c[a])for(var e=c[a],f=0,d=e.length;f<d;f++)b(e[f],e,f)},i=function(a,b){c[a]||(c[a]=[]);b&&b.sticky&&(c[a].sticky=!0);b&&b.data&&(c[a].data=b.data)},j=function(a,b){b&&b.sticky&&i(a,b);g(a,function(e){var c=[{type:a}].concat(b&&b.data);e.apply(d,c)})},h=function(a,b){i(a);c[a].push(b);if(c[a].sticky){var e=[{type:a}].concat(c[a].data);b.apply(d,e)}},k=function(a,b){var c=!1;g(a,function(a){a===b&&(c=!0)});c||h(a,b)},l=function(a,b){g(a,function(a,c,d){a===
b&&c.splice(d,1)})};d.E={publish:j,pub:j,unsubscribe:l,unsub:l,subscribe:h,subscribeUnique:k,sub:h,subUnique:k,__events__:c}})(self);