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package vim
import (
// ErrTimeOut represents time out error.
var ErrTimeOut = errors.New("time out")
// Body represents Message body. e.g. {expr} of `:h ch_sendexpr()`
type Body interface{}
// Message represents rpc message type of JSON channel. `:h channel-use`.
type Message struct {
MsgID int
Body Body
// Handler represents go server handler to handle message from Vim.
type Handler interface {
Serve(*Client, *Message)
// Server represents go server.
type Server struct {
Handler Handler // handler to invoke
// Serve starts go server.
func (srv *Server) Serve(l net.Listener) error {
defer l.Close()
for {
// Wait for a connection.
conn, err := l.Accept()
if err != nil {
if ne, ok := err.(net.Error); ok && ne.Temporary() {
return err
cli := NewClient(conn, srv.Handler)
// Handle the connection in a new goroutine.
// The loop then returns to accepting, so that
// multiple connections may be served concurrently.
go cli.Start()