public static int main(string[] args) {

    if(args.length < 2) {
        print(@"USAGE: $(args[0]) [COMMAND]\nCommands:\n\tnew [output]: create new PPCL and private key\n\tnew-member [member name]: generates a new keypair for a member\n\tadd-member [collection] [member name] [member key]: add a member to the member register\n\tadd-domain [collection] [DNS name]: add an authorative domain\n\tpublish [collection] [publication] [member]: publish the specified PPUB to the collection\n");
        return -1;
    }

    if(args[1] == "new") {
        uint8[] signing_key;
        var collection = new Ppub.Collection(out signing_key);
        
        var col_str = collection.to_string(signing_key);
        FileUtils.set_contents(args[2], col_str, col_str.length);

        var key_str = Base64.encode(signing_key);
        FileUtils.set_contents(args[2] + ".private.key", key_str, key_str.length);
        return 0;
    }

    if(args[1] == "new-member") {
        uint8[] sk;
        uint8[] pk;
        Ppub.CollectionMember.new_keypair(out sk, out pk);
        
        var sk_str = Base64.encode(sk);
        FileUtils.set_contents(args[2] + ".private.key", sk_str, sk_str.length);

        var pk_str = Base64.encode(pk);
        FileUtils.set_contents(args[2] + ".public.key", pk_str, pk_str.length);
        return 0;
    }

    var collection_name = args[2];
    string key_str;
    FileUtils.get_contents(args[2] + ".private.key", out key_str, null);
    var signing_key = Base64.decode(key_str);

    var collection_stream = new DataInputStream(File.new_for_path(collection_name).read());
    var collection = new Ppub.Collection.from_stream(collection_stream);

    if(args[1] == "add-member") {
        collection.increment_serial();
        collection.members.add(new Ppub.CollectionMember(args[3], Base64.decode(args[4])));
    }

    else if(args[1] == "add-domain") {
        collection.increment_serial();
        collection.domains.add(args[3]);
    }

    else if(args[1] == "publish") {
        var checksum = Ppub.CollectionPublication.generate_ppub_checksum(File.new_for_path(args[3]));
        
        string mem_key_str;
        FileUtils.get_contents(args[4] + ".private.key", out mem_key_str, null);
        var mem_signing_key = Base64.decode(mem_key_str);

        var publication = new Ppub.CollectionPublication(args[3], new DateTime.now_local(), args[4], checksum, mem_signing_key);
        collection.publications.add(publication);
    }
    else {
        print(@"Unrecognised command $(args[1])\n");
        return -2;
    }

    collection.touch();
    var col_str = collection.to_string(signing_key);
    FileUtils.set_contents(args[2], col_str, col_str.length);

    return 0;
}