permban.js

var nick;

function suffixFilter(suffix) {
    return suffix.length + nick.length + 1 <= 32;
}

var BANNED_SUFFIXES = [
    "(banned)",
    "[b&]",
    "(permbanned)",
    "(ban later)",
    "(banned for laziness)"
];

function printUsage() {
    channel.message("```\n//permban <@user>\n```");
}

var args = message.getContent().split(" ");
if (args.length != 2) {
    printUsage();
} else {
    var match = /^<@!?(\d+)>$/.exec(args[1]);
    if (!match) {
        printUsage();
    } else {
        var user = guild.getUser(match[1]);
        if (!user) {
            printUsage();
        } else {
            nick = user.getNickname() ? user.getNickname() : user.getName();
            var suffixes = BANNED_SUFFIXES.filter(suffixFilter);
            if (!suffixes) {
                channel.message("Unable to ban :(");
            } else {
                var suffix = suffixes[Math.floor(Math.random() * suffixes.length)];
                if (!manager.nickname(user, nick + " " + suffix)) {
                    channel.message("Cannot ban " + nick);
                } else {
                    channel.message("Banned " + nick);
                }
            }
        }
    }
}