gopls/internal/server: produce DocumentChange list in golang.Rename

Previously, golang.Rename returned isPkgRenaming and then the server
package add additional DocumentChanges before returning the final list.
This CL moves the logic for creating all edits and transforming them
to a list of DocumentChanges to the golang package.

Change-Id: Iaff2be270cc954ac1d0611cdfa901347247ce21c
Reviewed-on: https://go-review.googlesource.com/c/tools/+/708955
Auto-Submit: Madeline Kalil <mkalil@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Bypass: Madeline Kalil <mkalil@google.com>

gopls/internal/golang/rename.go

diff --git a/gopls/internal/golang/rename.go b/gopls/internal/golang/rename.go
index 57cccef..0b1d750 100644
--- a/gopls/internal/golang/rename.go
+++ b/gopls/internal/golang/rename.go
@@ -398,56 +398,69 @@
 	return nil
 }
 
+// editsToDocChanges converts a map of uris to arrays of text edits to a list of document changes.
+func editsToDocChanges(ctx context.Context, snapshot *cache.Snapshot, edits map[protocol.DocumentURI][]protocol.TextEdit) ([]protocol.DocumentChange, error) {
+	var changes []protocol.DocumentChange
+	for uri, e := range edits {
+		fh, err := snapshot.ReadFile(ctx, uri)
+		if err != nil {
+			return nil, err
+		}
+		changes = append(changes, protocol.DocumentChangeEdit(fh, e))
+	}
+	return changes, nil
+}
+
 // Rename returns a map of TextEdits for each file modified when renaming a
 // given identifier within a package and a boolean value of true for renaming
 // package and false otherwise.
-func Rename(ctx context.Context, snapshot *cache.Snapshot, f file.Handle, pp protocol.Position, newName string) (map[protocol.DocumentURI][]protocol.TextEdit, bool, error) {
+func Rename(ctx context.Context, snapshot *cache.Snapshot, f file.Handle, pp protocol.Position, newName string) ([]protocol.DocumentChange, error) {
 	ctx, done := event.Start(ctx, "golang.Rename")
 	defer done()
 
 	pkg, pgf, err := NarrowestPackageForFile(ctx, snapshot, f.URI())
 	if err != nil {
-		return nil, false, err
+		return nil, err
 	}
 	pos, err := pgf.PositionPos(pp)
 	if err != nil {
-		return nil, false, err
+		return nil, err
 	}
 
 	cur, ok := pgf.Cursor.FindByPos(pos, pos)
 	if !ok {
-		return nil, false, fmt.Errorf("can't find cursor for selection")
+		return nil, fmt.Errorf("can't find cursor for selection")
 	}
 
 	if edits, err := renameFuncSignature(ctx, pkg, pgf, pos, snapshot, cur, f, pp, newName); err != nil {
-		return nil, false, err
+		return nil, err
 	} else if edits != nil {
-		return edits, false, nil
+		return editsToDocChanges(ctx, snapshot, edits)
 	}
 
 	// Cursor within package name declaration?
 	_, inPackageName, err := parsePackageNameDecl(ctx, snapshot, f, pp)
 	if err != nil {
-		return nil, false, err
+		return nil, err
 	}
 
 	var editMap map[protocol.DocumentURI][]diff.Edit
 	if inPackageName {
 		countRenamePackage.Inc()
 		if !isValidPackagePath(pkg.String(), newName) {
-			return nil, false, fmt.Errorf("invalid package path: %q (package moves are not yet supported, see go.dev/issue/57171)", newName)
+			return nil, fmt.Errorf("invalid package path: %q (package moves are not yet supported, see go.dev/issue/57171)", newName)
 		}
 		// Only the last element of the path is required as input for [renamePackageName].
 		newName = path.Base(newName)
 		editMap, err = renamePackageName(ctx, snapshot, f, PackageName(newName))
 	} else {
 		if !isValidIdentifier(newName) {
-			return nil, false, fmt.Errorf("invalid identifier to rename: %q", newName)
+			return nil, fmt.Errorf("invalid identifier to rename: %q", newName)
 		}
 		editMap, err = renameOrdinary(ctx, snapshot, f.URI(), pp, newName)
 	}
 	if err != nil {
-		return nil, false, err
+		return nil, err
 	}
 
 	// Convert edits to protocol form.
@@ -476,21 +489,33 @@
 		// vendor/k8s.io/kubectl -> ../../staging/src/k8s.io/kubectl.
 		fh, err := snapshot.ReadFile(ctx, uri)
 		if err != nil {
-			return nil, false, err
+			return nil, err
 		}
 		data, err := fh.Content()
 		if err != nil {
-			return nil, false, err
+			return nil, err
 		}
 		m := protocol.NewMapper(uri, data)
 		textedits, err := protocol.EditsFromDiffEdits(m, edits)
 		if err != nil {
-			return nil, false, err
+			return nil, err
 		}
 		result[uri] = textedits
 	}
 
-	return result, inPackageName, nil
+	changes, err := editsToDocChanges(ctx, snapshot, result)
+	if err != nil {
+		return nil, err
+	}
+	// Update the last component of the file's enclosing directory.
+	if inPackageName {
+		oldDir := f.URI().DirPath()
+		newDir := filepath.Join(filepath.Dir(oldDir), path.Base(newName))
+		changes = append(changes, protocol.DocumentChangeRename(
+			protocol.URIFromPath(oldDir),
+			protocol.URIFromPath(newDir)))
+	}
+	return changes, nil
 }
 
 // renameOrdinary renames an ordinary (non-package) name throughout the workspace.

gopls/internal/server/rename.go

diff --git a/gopls/internal/server/rename.go b/gopls/internal/server/rename.go
index 022a5e1..c7abc4f 100644
--- a/gopls/internal/server/rename.go
+++ b/gopls/internal/server/rename.go
@@ -7,8 +7,6 @@
 import (
 	"context"
 	"fmt"
-	"path"
-	"path/filepath"
 
 	"golang.org/x/tools/gopls/internal/file"
 	"golang.org/x/tools/gopls/internal/golang"
@@ -32,34 +30,10 @@
 		return nil, fmt.Errorf("cannot rename in file of type %s", kind)
 	}
 
-	// Because we don't handle directory renaming within golang.Rename, golang.Rename returns
-	// boolean value isPkgRenaming to determine whether any DocumentChanges of type RenameFile should
-	// be added to the return protocol.WorkspaceEdit value.
-	edits, isPkgRenaming, err := golang.Rename(ctx, snapshot, fh, params.Position, params.NewName)
+	changes, err := golang.Rename(ctx, snapshot, fh, params.Position, params.NewName)
 	if err != nil {
 		return nil, err
 	}
-
-	var changes []protocol.DocumentChange
-	for uri, e := range edits {
-		fh, err := snapshot.ReadFile(ctx, uri)
-		if err != nil {
-			return nil, err
-		}
-		change := protocol.DocumentChangeEdit(fh, e)
-		changes = append(changes, change)
-	}
-
-	if isPkgRenaming {
-		// Update the last component of the file's enclosing directory.
-		oldDir := fh.URI().DirPath()
-		newDir := filepath.Join(filepath.Dir(oldDir), path.Base(params.NewName))
-		change := protocol.DocumentChangeRename(
-			protocol.URIFromPath(oldDir),
-			protocol.URIFromPath(newDir))
-		changes = append(changes, change)
-	}
-
 	return protocol.NewWorkspaceEdit(changes...), nil
 }