Slack JavaScript REPL bot

bot.js

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

var s = new Slack('api key here', true, true);

s.on('message', function(msg) {
        if(msg.type != 'message') {
                return;
        }

        var c = s.getChannelGroupOrDMByID(msg.channel);

        var t = msg.text;
        
        //the bot uses ~ as a trigger when to run JS code
        if(t[0] != '~') {
                return;
        }

        try {
                var result = vm.runInThisContext(t.substr(1));
        }
        catch(ex) {
                result = ex;
        }
        
        console.log('sending %s to %s', result, c.name);
        c.send('' + result);
});

s.on('error', console.log);

s.login();