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internal/lsp: show a warning message when opening an "orphaned" file
Build tags are a common stumbling block for users of gopls, as build tagged files may be excluded from the initial workspace load without a clear warning. This change adds a check for every opened file to confirm if it maps to a package. If not, we show a message with suggestions. A follow-up improvement might be to check if the opened file actually has build tags to make the error message more precise (and give a better example config). Updates golang/go#31668 Change-Id: I829d8546edea65aa08274021bfde8ea2fb6eeaa1 Reviewed-on: https://go-review.googlesource.com/c/tools/+/253798 Run-TryBot: Rebecca Stambler <rstambler@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -520,7 +520,7 @@ func f() {
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`
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runner.Run(t, noModule, func(t *testing.T, env *Env) {
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env.OpenFile("a.go")
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env.Await(env.DiagnosticAtRegexp("a.go", "fmt.Printl"), SomeShowMessage(""))
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env.Await(env.DiagnosticAtRegexp("a.go", "fmt.Printl"), ShownMessage(""))
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})
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}
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@ -1313,3 +1313,39 @@ func main() {}
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}
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})
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}
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func TestNotifyOrphanedFiles(t *testing.T) {
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const files = `
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-- go.mod --
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module mod.com
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go 1.12
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-- a/a.go --
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package a
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func main() {
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var x int
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}
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-- a/a_ignore.go --
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// +build ignore
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package a
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func _() {
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var x int
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}
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`
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run(t, files, func(t *testing.T, env *Env) {
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env.Await(
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CompletedWork(lsp.DiagnosticWorkTitle(lsp.FromInitialWorkspaceLoad), 1),
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)
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env.OpenFile("a/a.go")
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env.Await(
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env.DiagnosticAtRegexp("a/a.go", "x"),
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)
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env.OpenFile("a/a_ignore.go")
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env.Await(
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ShownMessage("No packages found for open file"),
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)
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})
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}
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@ -389,8 +389,9 @@ func NoShowMessage() SimpleExpectation {
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}
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}
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// SomeShowMessage asserts that the editor has received a ShowMessage with the given title.
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func SomeShowMessage(title string) SimpleExpectation {
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// ShownMessage asserts that the editor has received a ShownMessage with the
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// given title.
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func ShownMessage(title string) SimpleExpectation {
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check := func(s State) (Verdict, interface{}) {
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for _, m := range s.showMessage {
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if strings.Contains(m.Message, title) {
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@ -11,7 +11,9 @@ import (
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"path/filepath"
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"sync"
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"golang.org/x/tools/internal/event"
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"golang.org/x/tools/internal/jsonrpc2"
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"golang.org/x/tools/internal/lsp/debug/tag"
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"golang.org/x/tools/internal/lsp/protocol"
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"golang.org/x/tools/internal/lsp/source"
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"golang.org/x/tools/internal/span"
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@ -89,16 +91,13 @@ func (s *Server) didOpen(ctx context.Context, params *protocol.DidOpenTextDocume
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return err
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}
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}
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return s.didModifyFiles(ctx, []source.FileModification{
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{
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URI: uri,
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Action: source.Open,
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Version: params.TextDocument.Version,
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Text: []byte(params.TextDocument.Text),
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LanguageID: params.TextDocument.LanguageID,
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},
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}, FromDidOpen)
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return s.didModifyFiles(ctx, []source.FileModification{{
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URI: uri,
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Action: source.Open,
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Version: params.TextDocument.Version,
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Text: []byte(params.TextDocument.Text),
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LanguageID: params.TextDocument.LanguageID,
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}}, FromDidOpen)
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}
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func (s *Server) didChange(ctx context.Context, params *protocol.DidChangeTextDocumentParams) error {
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@ -280,10 +279,17 @@ func (s *Server) didModifyFiles(ctx context.Context, modifications []source.File
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}
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}
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diagnosticWG.Add(1)
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go func(snapshot source.Snapshot) {
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go func(snapshot source.Snapshot, uris []span.URI) {
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defer diagnosticWG.Done()
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s.diagnoseSnapshot(snapshot)
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}(snapshot)
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// If files have been newly opened, check if we found packages for
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// them. If not, notify this user that the file may be excluded
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// because of build tags.
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if cause == FromDidOpen {
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s.checkForOrphanedFile(ctx, snapshot, uris)
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}
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}(snapshot, uris)
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}
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go func() {
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@ -307,6 +313,34 @@ func DiagnosticWorkTitle(cause ModificationSource) string {
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return fmt.Sprintf("diagnosing %v", cause)
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}
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// checkForOrphanedFile checks that the given URIs can be mapped to packages.
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// If they cannot and the workspace is not otherwise unloaded, it also surfaces
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// a warning, suggesting that the user check the file for build tags.
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func (s *Server) checkForOrphanedFile(ctx context.Context, snapshot source.Snapshot, uris []span.URI) {
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// Only show the error message if we have packages in the workspace,
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// but no package for the file.
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if pkgs, err := snapshot.WorkspacePackages(ctx); err != nil || len(pkgs) == 0 {
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return
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}
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for _, uri := range uris {
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pkgs, err := snapshot.PackagesForFile(ctx, uri, source.TypecheckWorkspace)
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if len(pkgs) > 0 || err == nil {
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return
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}
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// TODO(rstambler): We should be able to parse the build tags in the
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// file and show a more specific error message.
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if err := s.client.ShowMessage(ctx, &protocol.ShowMessageParams{
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Type: protocol.Error,
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Message: fmt.Sprintf(`No packages found for open file %s: %v.
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If this file contains build tags, try adding "-tags=<build tag>" to your gopls "buildFlag" configuration (see (https://github.com/golang/tools/blob/master/gopls/doc/settings.md#buildflags-string).
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Otherwise, see the troubleshooting guidelines for help investigating (https://github.com/golang/tools/blob/master/gopls/doc/troubleshooting.md).
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`, uri.Filename(), err),
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}); err != nil {
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event.Error(ctx, "warnAboutBuildTags: failed to show message", err, tag.URI.Of(uri))
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}
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}
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}
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func (s *Server) wasFirstChange(uri span.URI) bool {
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s.changedFilesMu.Lock()
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defer s.changedFilesMu.Unlock()
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