public static function fromCommandClass($name, $subCommand = null)
    {
        $prefix = 'execute';
        $class = new ReflectionClass($name);

        if ($subCommand) {
            $method = $prefix . ucfirst(Utils::camelize($subCommand));
            if (!$class->hasMethod($method)) {
                throw new ConsoleException("Sub command '$subCommand' of '$name' does not exist");
            }
            return new Help($class->getMethod($method)->getDocComment());
        }

        $help = new Help($class->getDocComment());
        foreach ($class->getMethods() as $method) {
            if (strlen($method->getName()) > strlen($prefix) && 
                substr($method->getName(), 0, strlen($prefix)) === $prefix) {
                    $help->subCommands[] = Utils::dashized(substr($method->getName(), strlen($prefix)));
            }
        }
        return $help;
    }