config-lsp/main.go

package main

import (
	"github.com/tliron/commonlog"
	"github.com/tliron/glsp"
	protocol "github.com/tliron/glsp/protocol_3_16"
	"github.com/tliron/glsp/server"

	// Must include a backend implementation
	// See CommonLog for other options: https://github.com/tliron/commonlog
	_ "github.com/tliron/commonlog/simple"
)

const lsName = "my language"

var (
	version string = "0.0.1"
	handler protocol.Handler
)

func main() {
	// This increases logging verbosity (optional)
	commonlog.Configure(1, nil)

	handler = protocol.Handler{
		Initialize:  initialize,
		Initialized: initialized,
		Shutdown:    shutdown,
		SetTrace:    setTrace,
		TextDocumentCompletion: TextDocumentCompletion,
	}

	server := server.NewServer(&handler, lsName, false)

	server.RunStdio()
}

func initialize(context *glsp.Context, params *protocol.InitializeParams) (any, error) {
	capabilities := handler.CreateServerCapabilities()

	return protocol.InitializeResult{
		Capabilities: capabilities,
		ServerInfo: &protocol.InitializeResultServerInfo{
			Name:    lsName,
			Version: &version,
		},
	}, nil
}

func initialized(context *glsp.Context, params *protocol.InitializedParams) error {
	return nil
}

func shutdown(context *glsp.Context) error {
	protocol.SetTraceValue(protocol.TraceValueOff)
	return nil
}

func setTrace(context *glsp.Context, params *protocol.SetTraceParams) error {
	protocol.SetTraceValue(params.Value)
	return nil
}

func TextDocumentCompletion(context *glsp.Context, params *protocol.CompletionParams) (interface{}, error) {
	var completions []protocol.CompletionItem

	Label := "happyface"
	text := "Hello World!"

	completions = append(completions, protocol.CompletionItem{
		Label: Label,
		Detail: &text,
		InsertText: &text,
	})

	return completions, nil
}