bot.js

var Botkit = require('botkit');
var redis = require('botkit/lib/storage/redis_storage');
var http = require('http');
var url = require('url');

var redisURL = url.parse(process.env.REDISCLOUD_URL);
var redisStorage = redis({
    namespace: 'botkit-example',
    host: redisURL.hostname,
    port: redisURL.port,
    auth_pass: redisURL.auth.split(":")[1]
});

var controller = Botkit.slackbot({
    storage: redisStorage
});

var bot = controller.spawn({
    token: process.env.SLACK_TOKEN
}).startRTM();

controller.hears(['call me (.*)'],'direct_message,direct_mention,mention',function(bot, message) {
    var matches = message.text.match(/call me (.*)/i);
    var name = matches[1];
    controller.storage.users.get(message.user,function(err, user) {
        if (!user) {
            user = {
                id: message.user,
            };
        }
        user.name = name;
        controller.storage.users.save(user,function(err, id) {
            bot.reply(message,'Got it. I will call you ' + user.name + ' from now on.');
        });
    });
});

controller.hears(['what is my name','who am i'],'direct_message,direct_mention,mention',function(bot, message) {

    controller.storage.users.get(message.user,function(err, user) {
        if (user && user.name) {
            bot.reply(message,'Your name is ' + user.name);
        } else {
            bot.reply(message,'I don\'t know yet!');
        }
    });
});

// To keep Heroku's free dyno awake
http.createServer(function(request, response) {
    response.writeHead(200, {'Content-Type': 'text/plain'});
    response.end('Ok, dyno is awake.');
}).listen(process.env.PORT || 5000);