lincsbot.js

var Slack = require('slack-client');

var token = 'xoxb-7212819110-AT2jJNWQlmR1WYLX2FBHdtAH';

var slack = new Slack(token, true, true);

var makeMention = function(userId) {
    return '<@' + userId + '>';
};

var isDirect = function(userId, messageText) {
    var userTag = makeMention(userId);
    return messageText &&
           messageText.length >= userTag.length &&
           messageText.substr(0, userTag.length) === userTag;
};

var getOnlineHumansForChannel = function(channel) {
    if (!channel) return [];

    return (channel.members || [])
        .map(function(id) { return slack.users[id]; })
        .filter(function(u) { return !!u && !u.is_bot && u.presence === 'active'; });
};

slack.on('open', function () {
    var channels = Object.keys(slack.channels)
        .map(function (k) { return slack.channels[k]; })
        .filter(function (c) { return c.is_member; })
        .map(function (c) { return c.name; });

    var groups = Object.keys(slack.groups)
        .map(function (k) { return slack.groups[k]; })
        .filter(function (g) { return g.is_open && !g.is_archived; })
        .map(function (g) { return g.name; });

    console.log('Welcome to Slack. You are ' + slack.self.name + ' of ' + slack.team.name);

    if (channels.length > 0) {
        console.log('You are in: ' + channels.join(', '));
    }
    else {
        console.log('You are not in any channels.');
    }

    if (groups.length > 0) {
       console.log('As well as: ' + groups.join(', '));
    }
});

slack.on('message', function(message) {
    var channel = slack.getChannelGroupOrDMByID(message.channel);
    var user = slack.getUserByID(message.user);

    if (message.type === 'message' && isDirect(slack.self.id, message.text)) {
        var trimmedMessage = message.text.substr(makeMention(slack.self.id).length).trim();
        
        var onlineUsers = getOnlineHumansForChannel(channel)
            .filter(function(u) { return u.id != user.id; })
            .map(function(u) { return makeMention(u.id); });
        
        channel.send(onlineUsers.join(', ') + '\r\n' + user.real_name + ' said: ' + trimmedMessage);
    }
});

slack.login();