def net_resolve(file, name):
    """Resolve service name to ip or ip:port:proto lines"""
    data = _net_read(file)
    if ':' in name:
        svc_name, port_name = name.split(':', 1)
        if svc_name not in data:
            print(f"Error: Service not found: {svc_name}", file=sys.stderr)
            sys.exit(1)
        svc = data[svc_name]
        ip  = svc.get('ip', '')
        if port_name == 'ports':
            # All ports
            for pname, pdef in svc.get('ports', {}).items():
                print(f"{ip}:{pdef['port']}:{pdef.get('proto','tcp')}")
        else:
            if port_name not in svc.get('ports', {}):
                print(f"Error: Port not found: {port_name}", file=sys.stderr)
                sys.exit(1)
            pdef = svc['ports'][port_name]
            print(f"{ip}:{pdef['port']}:{pdef.get('proto','tcp')}")
    else:
        if name not in data:
            print(f"Error: Service not found: {name}", file=sys.stderr)
            sys.exit(1)
        print(data[name].get('ip', ''))


function net::resolve() {
  local name="${1:?}"
  json::net_resolve "$(ctx::net)" "$name"
}