mustache.js

module.exports = function (bot) {
    'use strict';

    var unexisto = 'User {0} was not found in room {1} (sorry, mustache only ' +
        'works there).';

    function mustachify (args) {
        var props = parseArgs(args),
            usrid = props.usrid;
        bot.log(props, '/mustache input');

        // check for url passing
        if (linkCheck(usrid)) {
            finish(encodeURIComponent(usrid));
            return;
        }

        if (!usrid) {
            usrid = args.get('user_id');
        }
        else if (/\D/.test(usrid)) {
            usrid = args.findUserId(usrid);
        }

        bot.log(usrid, '/mustache mapped');

        if (!bot.users.hasOwnProperty(usrid)) {
            return unexisto.supplant(usrid, bot.adapter.roomid);
        }
        else if (Number(usrid) === bot.adapter.userid) {
            return [
                'Nobody puts a mustache on me. Again.',
                'Mustache me once, shame on you. Mustache me ---twice--- 9 times...'
            ].random();
        }

        var hash = bot.users[usrid].email_hash;
        // SO now allows non-gravatar images. the email_hash will be a link to
        // the image in that case, prepended with a ! for some reason
        if (hash[0] === '!') {
            finish(encodeURIComponent(hash.slice(1)) + '#.png');
        }
        else {
            finish('http%3A%2F%2Fwww.gravatar.com%2Favatar%2F{0}%3Fs%3D256%26d%3Didenticon#.png'.supplant(hash));
        }

        function finish (src) {
            bot.log(src, '/mustache finish');

            args.directreply('http://mustachify.me/' + props.mustache + '?src=' + src);
        }

        function parseArgs (args) {
            var parts = args.parse(),
                last = parts.pop(),
                ret = {};

            // /mustache usrid mustache
            // /mustache user-name mustache
            // we've already `.pop`ed the mustache part, so we need to account for it
            if (parts.length > 0 && !(/\D/).test(last)) {
                ret.usrid = parts.join(' ');
                ret.mustache = last;
            }
            // /mustache usrid
            else {
                ret.usrid = args.content;
                ret.mustache = Math.rand(0, 5);
            }

            return ret;
        }
    }

    function linkCheck (suspect) {
        return suspect.startsWith('http') || suspect.startsWith('www');
    }

    var cmd = {
        name: 'mustache',
        fun: mustachify,
        privileges: {
            del: 'NONE'
        },

        description: 'Mustachifies a user. ' +
            '`/mustache [link|usrid|username] [mustache=rand(0,5)]`'
    };

    bot.addCommand(cmd);

    // #176, alias moustache to mustache
    var moustache = Object.merge(cmd, { name: 'moustache' });
    bot.addCommand(moustache);

};