README.md: fix the code example

README.md

@@ -11,30 +11,44 @@ The package does not include JSON RPC handling as that is better left to other p
 Example code using [github.com/sourcegraph/jsonrpc2](https://github.com/sourcegraph/jsonrpc2)
 
 ```go
+package main
 
 import (
-    "fmt"
-    "io"
 	"context"
 	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+
+	"github.com/laravel-ls/protocol"
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func handler(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (any, error) {
+func handleInitialize(params protocol.InitializeParams) (protocol.InitializeResult, error) {
+	// Initialization logic
+	// Read more at: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#initialize
+	return protocol.InitializeResult{
+		Capabilities: protocol.ServerCapabilities{
+			TextDocumentSync: protocol.TextDocumentSyncKindFull,
+		},
+		ServerInfo: &protocol.ServerInfo{
+			Name:    "My LSP Server",
+			Version: "1.0.0",
+		},
+	}, nil
+}
 
+func handler(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (any, error) {
 	switch req.Method {
 	case protocol.MethodInitialize:
 		var params protocol.InitializeParams
 		if err := json.Unmarshal(*req.Params, &params); err != nil {
 			return nil, err
 		}
-    // handle initialize
-    case protocol.MethodTextDocumentDidChange:
-        var params protocol.DidChangeTextDocumentParams
-        if err := json.Unmarshal(*req.Params, &params); err != nil {
-            return nil, err
-        }
-    // handle did change
+		return handleInitialize(params)
+	// ... add more methods
 	default:
 		// Respond with a method not found error
 		return nil, &jsonrpc2.Error{
@@ -42,12 +56,11 @@ func handler(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (a
 			Message: fmt.Sprintf("Method %s not found", req.Method),
 		}
 	}
-    return nil, nil
 }
 
-func (s Server) Run(ctx context.Context, conn io.ReadWriteCloser) error {
+func handleConn(ctx context.Context, conn io.ReadWriteCloser) error {
 	stream := jsonrpc2.NewBufferedStream(conn, jsonrpc2.VSCodeObjectCodec{})
-    rpc := jsonrpc2.NewConn(ctx, stream, jsonrpc2.HandlerWithError(s.dispatch))
+	rpc := jsonrpc2.NewConn(ctx, stream, jsonrpc2.HandlerWithError(handler))
 
 	select {
 	case <-ctx.Done():
@@ -56,6 +69,40 @@ func (s Server) Run(ctx context.Context, conn io.ReadWriteCloser) error {
 		return nil
 	}
 }
+
+func main() {
+	// example TCP server.
+	ctx := context.Background()
+	logger := log.New(os.Stderr, "[tcp-lsp] ", log.LstdFlags|log.Lmicroseconds)
+
+	addr := "127.0.0.1:4389"
+	l, err := net.Listen("tcp", addr)
+	if err != nil {
+		log.Fatal(err)
+	}
+	logger.Println("Listening on", addr)
+
+	for {
+		conn, err := l.Accept()
+		if err != nil {
+			logger.Println("accept error:", err)
+			continue
+		}
+
+		logger.Println("Client connected:", conn.RemoteAddr())
+
+		go func(c net.Conn) {
+			defer c.Close()
+			handleConn(ctx, c)
+		}(conn)
+	}
+}
+```
+
+You can test your server with the following command on linux:
+
+```bash
+printf 'Content-Length: 58\r\n\r\n{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}' | nc 127.0.0.1 4389
 ```
 
 # Author