cmd/acme-lsp: add -hidediag flag and HideDiagnostics config

Fixes #27

Author: fhs

internal/lsp/acmelsp/client.go

@@ -24,6 +24,7 @@ type DiagnosticsWriter interface {
 // clientHandler handles JSON-RPC requests and notifications.
 type clientHandler struct {
 	cfg        *ClientConfig
+	hideDiag   bool
 	diagWriter DiagnosticsWriter
 	diag       map[protocol.DocumentURI][]protocol.Diagnostic
 	mu         sync.Mutex
@@ -50,6 +51,9 @@ func (h *clientHandler) Event(context.Context, *interface{}) error {
 }
 
 func (h *clientHandler) PublishDiagnostics(ctx context.Context, params *protocol.PublishDiagnosticsParams) error {
+	if h.hideDiag {
+		return nil
+	}
 	h.mu.Lock()
 	defer h.mu.Unlock()
 
@@ -94,6 +98,7 @@ func (h *clientHandler) ApplyEdit(ctx context.Context, params *protocol.ApplyWor
 type ClientConfig struct {
 	*config.Server
 	RootDirectory string                     // used to compute RootURI in initialization
+	HideDiag      bool                       // don't write diagnostics to DiagWriter
 	DiagWriter    DiagnosticsWriter          // notification handler writes diagnostics here
 	Workspaces    []protocol.WorkspaceFolder // initial workspace folders
 	Logger        *log.Logger
@@ -118,6 +123,7 @@ func (c *Client) init(conn net.Conn, cfg *ClientConfig) error {
 	stream := jsonrpc2.NewHeaderStream(conn, conn)
 	ctx, rpc, server := protocol.NewClient(ctx, stream, &clientHandler{
 		cfg:        cfg,
+		hideDiag:   cfg.HideDiag,
 		diagWriter: cfg.DiagWriter,
 		diag:       make(map[protocol.DocumentURI][]protocol.Diagnostic),
 	})

internal/lsp/acmelsp/config/config.go

@@ -44,6 +44,9 @@ type File struct {
 	// Root directory used for LSP initialization.
 	RootDirectory string
 
+	// Don't show diagnostics sent by the LSP server.
+	HideDiagnostics bool
+
 	// Format file when Put is executed in a window.
 	FormatOnPut bool
 
@@ -242,7 +245,8 @@ func (cfg *Config) ParseFlags(flags Flags, f *flag.FlagSet, arguments []string)
 	}
 	if flags&LangServerFlags != 0 {
 		f.BoolVar(&cfg.Verbose, "debug", cfg.Verbose, "turn on debugging prints (deprecated: use -v)")
-		f.StringVar(&cfg.RootDirectory, "rootdir", cfg.RootDirectory, "root directory used for LSP initialization.")
+		f.StringVar(&cfg.RootDirectory, "rootdir", cfg.RootDirectory, "root directory used for LSP initialization")
+		f.BoolVar(&cfg.HideDiagnostics, "hidediag", false, "hide diagnostics sent by LSP server")
 		f.StringVar(&workspaces, "workspaces", "", "colon-separated list of initial workspace directories")
 		f.Var(&userServers, "server", `language server command for filename match (e.g. '\.go$:gopls')`)
 		f.Var(&dialServers, "dial", `language server address for filename match (e.g. '\.go$:localhost:4389')`)

internal/lsp/acmelsp/exec.go

@@ -216,6 +216,7 @@ func (ss *ServerSet) ClientConfig(info *ServerInfo) *ClientConfig {
 	return &ClientConfig{
 		Server:        info.Server,
 		RootDirectory: ss.cfg.RootDirectory,
+		HideDiag:      ss.cfg.HideDiagnostics,
 		DiagWriter:    ss.diagWriter,
 		Workspaces:    ss.Workspaces(),
 		Logger:        info.Logger,