index.js

var readline = require('readline');
var parseBool = require('parseboolean');
var SlackBot = require('slackbots');
var argv = require('yargs').argv;
var channel = 'general';
var botname = 'Bot';
var icon = ':computer:';
var silent = false;
var muted = false;
var outputBuffer = [];

// ARGV Channel (-f)
if (argv.f && argv.f != '') {
    channel = argv.f
} else {
    channel = process.env.SLACKCAT_CHANNEL || channel;
}
channel = channel.replace('#','');

// ARGV Bot Name (-n)
if (argv.n && argv.n != '') {
    botname = argv.n;
} else {
    botname = process.env.SLACKCAT_USERNAME || botname;
}

// ARGV Bot Emoticon Icon (-i)
if (argv.i && argv.i != '') {
    icon = argv.i;
} else {
    icon = process.env.SLACKCAT_ICON || icon;
}

// ARGV Be Silent *Don't console.log input to the output buffer* (-s)
if (argv.s && argv.s != '') {
    silent = parseBool(argv.s);
} else {
    silent = parseBool(process.env.SLACKCAT_SILENT) || silent;
}

// ARGV Be Muted *Don't actually output slack* (-m)
if (argv.m && argv.m != '') {
    muted = parseBool(argv.m);
} else {
    muted = parseBool(process.env.SLACKCAT_MUTED) || muted;
}

// Slack Params
var params = {
    icon_emoji: icon
};

// Missing Token?
if (!process.env.SLACKCAT_API_TOKEN || process.env.SLACKCAT_API_TOKEN == '') {
    console.log('Error: Please set your SLACKCAT_API_TOKEN environment variable. See: https://my.slack.com/services/new/bot');
    process.exit(1);
}

// Create A Bot
var bot = new SlackBot({
    token: process.env.SLACKCAT_API_TOKEN, // Token from https://my.slack.com/services/new/bot
    name: botname
});

bot.on('start', function() {

    // Object Push Prototype
    Object.defineProperty(outputBuffer, "push", {
        enumerable: false, // hide from for...in
        configurable: false, // prevent further meddling...
        writable: false, // see above ^
        value: function () {
            for (var i = 0, n = this.length, l = arguments.length; i < l; i++, n++) {
                if (!silent) {
                    console.log(arguments[i]);
                }
                if (!muted) {
                    bot.postMessageToChannel(channel, arguments[i], params);   
                }
                outputBuffer.pop();
            }
            return n;
        }
    });

    try {
        // Hook STDIN
        var rl = readline.createInterface({
            input: process.stdin,
            output: process.stdout,
            terminal: false
        });

        // Line Out
        rl.on('line', function(line) {
            outputBuffer.push(line);
        });

        // Watch For STDIO close and wait 10 seconds before closing
        rl.on('close', function() {
            setTimeout(function() {
                process.exit(1);
            }, 10000);
        });
    } catch (err) {
        console.log('SlackCat Readline Error:', err);
        setTimeout(function() {
            process.exit(1);
        }, 10000);
    }
});