def format_device(dev):
    """
    Format a device for display.
    """
    copy_dev = dev.copy()
    for key in ('ip', 'replication_ip'):
        if ':' in copy_dev[key]:
            copy_dev[key] = '[' + copy_dev[key] + ']'
    return (
        'd%(id)sr%(region)sz%(zone)s-%(ip)s:%(port)sR%(replication_ip)s:%(replication_port)s/%(device)s_"%(meta)s"'
         % copy_dev)
