cmd/golsp: An empty shell of an lsp server for the go language
Change-Id: I51ef556048c2d10537ad90fa5284939e09bc31fd
Reviewed-on: https://go-review.googlesource.com/137097
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
diff --git a/cmd/golsp/main.go b/cmd/golsp/main.go
new file mode 100644
index 0000000..fd56da4
--- /dev/null
+++ b/cmd/golsp/main.go
@@ -0,0 +1,90 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The golsp command is an LSP server for Go.
+// The Language Server Protocol allows any text editor
+// to be extended with IDE-like features;
+// see https://langserver.org/ for details.
+package main // import "golang.org/x/tools/cmd/golsp"
+
+import (
+ "context"
+ "flag"
+ "fmt"
+ "log"
+ "os"
+ "runtime"
+ "runtime/pprof"
+ "runtime/trace"
+
+ "golang.org/x/tools/internal/jsonrpc2"
+ "golang.org/x/tools/internal/lsp"
+)
+
+var (
+ cpuprofile = flag.String("cpuprofile", "", "write CPU profile to this file")
+ memprofile = flag.String("memprofile", "", "write memory profile to this file")
+ traceFlag = flag.String("trace", "", "write trace log to this file")
+)
+
+func main() {
+ flag.Usage = func() {
+ fmt.Fprintf(os.Stderr, "usage: golsp [flags]\n")
+ flag.PrintDefaults()
+ }
+ flag.Parse()
+ if flag.NArg() > 0 {
+ flag.Usage()
+ os.Exit(2)
+ }
+
+ if *cpuprofile != "" {
+ f, err := os.Create(*cpuprofile)
+ if err != nil {
+ log.Fatal(err)
+ }
+ if err := pprof.StartCPUProfile(f); err != nil {
+ log.Fatal(err)
+ }
+ // NB: profile won't be written in case of error.
+ defer pprof.StopCPUProfile()
+ }
+
+ if *traceFlag != "" {
+ f, err := os.Create(*traceFlag)
+ if err != nil {
+ log.Fatal(err)
+ }
+ if err := trace.Start(f); err != nil {
+ log.Fatal(err)
+ }
+ // NB: trace log won't be written in case of error.
+ defer func() {
+ trace.Stop()
+ log.Printf("To view the trace, run:\n$ go tool trace view %s", *traceFlag)
+ }()
+ }
+
+ if *memprofile != "" {
+ f, err := os.Create(*memprofile)
+ if err != nil {
+ log.Fatal(err)
+ }
+ // NB: memprofile won't be written in case of error.
+ defer func() {
+ runtime.GC() // get up-to-date statistics
+ if err := pprof.WriteHeapProfile(f); err != nil {
+ log.Fatalf("Writing memory profile: %v", err)
+ }
+ f.Close()
+ }()
+ }
+ if err := run(context.Background()); err != nil {
+ log.Fatal(err)
+ }
+}
+
+func run(ctx context.Context) error {
+ return lsp.RunServer(ctx, jsonrpc2.NewHeaderStream(os.Stdin, os.Stdout), jsonrpc2.Log)
+}
diff --git a/internal/lsp/server.go b/internal/lsp/server.go
new file mode 100644
index 0000000..de97148
--- /dev/null
+++ b/internal/lsp/server.go
@@ -0,0 +1,177 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lsp
+
+import (
+ "context"
+
+ "golang.org/x/tools/internal/jsonrpc2"
+ "golang.org/x/tools/internal/lsp/protocol"
+)
+
+// RunServer starts an LSP server on the supplied stream, and waits until the
+// stream is closed.
+func RunServer(ctx context.Context, stream jsonrpc2.Stream, opts ...interface{}) error {
+ s := &server{}
+ conn, client := protocol.RunServer(ctx, stream, s, opts...)
+ s.client = client
+ return conn.Wait(ctx)
+}
+
+type server struct {
+ client protocol.Client
+}
+
+func notImplemented(method string) *jsonrpc2.Error {
+ return jsonrpc2.NewErrorf(jsonrpc2.CodeMethodNotFound, "method %q not yet implemented", method)
+}
+
+func (s *server) Initialize(context.Context, *protocol.InitializeParams) (*protocol.InitializeResult, error) {
+ return nil, notImplemented("Initialize")
+}
+
+func (s *server) Initialized(context.Context, *protocol.InitializedParams) error {
+ return notImplemented("Initialized")
+}
+
+func (s *server) Shutdown(context.Context) error {
+ return notImplemented("Shutdown")
+}
+
+func (s *server) Exit(context.Context) error {
+ return notImplemented("Exit")
+}
+
+func (s *server) DidChangeWorkspaceFolders(context.Context, *protocol.DidChangeWorkspaceFoldersParams) error {
+ return notImplemented("DidChangeWorkspaceFolders")
+}
+
+func (s *server) DidChangeConfiguration(context.Context, *protocol.DidChangeConfigurationParams) error {
+ return notImplemented("DidChangeConfiguration")
+}
+
+func (s *server) DidChangeWatchedFiles(context.Context, *protocol.DidChangeWatchedFilesParams) error {
+ return notImplemented("DidChangeWatchedFiles")
+}
+
+func (s *server) Symbols(context.Context, *protocol.WorkspaceSymbolParams) ([]protocol.SymbolInformation, error) {
+ return nil, notImplemented("Symbols")
+}
+
+func (s *server) ExecuteCommand(context.Context, *protocol.ExecuteCommandParams) (interface{}, error) {
+ return nil, notImplemented("ExecuteCommand")
+}
+
+func (s *server) DidOpen(context.Context, *protocol.DidOpenTextDocumentParams) error {
+ return notImplemented("DidOpen")
+}
+
+func (s *server) DidChange(context.Context, *protocol.DidChangeTextDocumentParams) error {
+ return nil
+}
+
+func (s *server) WillSave(context.Context, *protocol.WillSaveTextDocumentParams) error {
+ return notImplemented("WillSave")
+}
+
+func (s *server) WillSaveWaitUntil(context.Context, *protocol.WillSaveTextDocumentParams) ([]protocol.TextEdit, error) {
+ return nil, notImplemented("WillSaveWaitUntil")
+}
+
+func (s *server) DidSave(context.Context, *protocol.DidSaveTextDocumentParams) error {
+ return notImplemented("DidSave")
+}
+
+func (s *server) DidClose(context.Context, *protocol.DidCloseTextDocumentParams) error {
+ return notImplemented("DidClose")
+}
+
+func (s *server) Completion(context.Context, *protocol.CompletionParams) (*protocol.CompletionList, error) {
+ return nil, notImplemented("Completion")
+}
+
+func (s *server) CompletionResolve(context.Context, *protocol.CompletionItem) (*protocol.CompletionItem, error) {
+ return nil, notImplemented("CompletionResolve")
+}
+
+func (s *server) Hover(context.Context, *protocol.TextDocumentPositionParams) (*protocol.Hover, error) {
+ return nil, notImplemented("Hover")
+}
+
+func (s *server) SignatureHelp(context.Context, *protocol.TextDocumentPositionParams) (*protocol.SignatureHelp, error) {
+ return nil, notImplemented("SignatureHelp")
+}
+
+func (s *server) Definition(context.Context, *protocol.TextDocumentPositionParams) ([]protocol.Location, error) {
+ return nil, notImplemented("Definition")
+}
+
+func (s *server) TypeDefinition(context.Context, *protocol.TextDocumentPositionParams) ([]protocol.Location, error) {
+ return nil, notImplemented("TypeDefinition")
+}
+
+func (s *server) Implementation(context.Context, *protocol.TextDocumentPositionParams) ([]protocol.Location, error) {
+ return nil, notImplemented("Implementation")
+}
+
+func (s *server) References(context.Context, *protocol.ReferenceParams) ([]protocol.Location, error) {
+ return nil, notImplemented("References")
+}
+
+func (s *server) DocumentHighlight(context.Context, *protocol.TextDocumentPositionParams) ([]protocol.DocumentHighlight, error) {
+ return nil, notImplemented("DocumentHighlight")
+}
+
+func (s *server) DocumentSymbol(context.Context, *protocol.DocumentSymbolParams) ([]protocol.DocumentSymbol, error) {
+ return nil, notImplemented("DocumentSymbol")
+}
+
+func (s *server) CodeAction(context.Context, *protocol.CodeActionParams) ([]protocol.CodeAction, error) {
+ return nil, notImplemented("CodeAction")
+}
+
+func (s *server) CodeLens(context.Context, *protocol.CodeLensParams) ([]protocol.CodeLens, error) {
+ return nil, notImplemented("CodeLens")
+}
+
+func (s *server) CodeLensResolve(context.Context, *protocol.CodeLens) (*protocol.CodeLens, error) {
+ return nil, notImplemented("CodeLensResolve")
+}
+
+func (s *server) DocumentLink(context.Context, *protocol.DocumentLinkParams) ([]protocol.DocumentLink, error) {
+ return nil, notImplemented("DocumentLink")
+}
+
+func (s *server) DocumentLinkResolve(context.Context, *protocol.DocumentLink) (*protocol.DocumentLink, error) {
+ return nil, notImplemented("DocumentLinkResolve")
+}
+
+func (s *server) DocumentColor(context.Context, *protocol.DocumentColorParams) ([]protocol.ColorInformation, error) {
+ return nil, notImplemented("DocumentColor")
+}
+
+func (s *server) ColorPresentation(context.Context, *protocol.ColorPresentationParams) ([]protocol.ColorPresentation, error) {
+ return nil, notImplemented("ColorPresentation")
+}
+
+func (s *server) Formatting(context.Context, *protocol.DocumentFormattingParams) ([]protocol.TextEdit, error) {
+ return nil, notImplemented("Formatting")
+}
+
+func (s *server) RangeFormatting(context.Context, *protocol.DocumentRangeFormattingParams) ([]protocol.TextEdit, error) {
+ return nil, notImplemented("RangeFormatting")
+}
+
+func (s *server) OnTypeFormatting(context.Context, *protocol.DocumentOnTypeFormattingParams) ([]protocol.TextEdit, error) {
+ return nil, notImplemented("OnTypeFormatting")
+}
+
+func (s *server) Rename(context.Context, *protocol.RenameParams) ([]protocol.WorkspaceEdit, error) {
+ return nil, notImplemented("Rename")
+}
+
+func (s *server) FoldingRanges(context.Context, *protocol.FoldingRangeRequestParam) ([]protocol.FoldingRange, error) {
+ return nil, notImplemented("FoldingRanges")
+}
