internal/lsp: remove filename print from rename output

This prevents piping back to the file, a common pattern.
Multi file forms should use the unified diff.

Change-Id: I1ea140c59de24feb74a64b0cb41890536f23cd3a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/197157
Run-TryBot: Ian Cottrell <iancottrell@google.com>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>

internal/lsp/cmd/rename.go

@@ -117,7 +117,9 @@ func (r *rename) Run(ctx context.Context, args ...string) error {
 			diffs := diff.ToUnified(filename+".orig", filename, string(cmdFile.mapper.Content), myersEdits)
 			fmt.Print(diffs)
 		default:
-			fmt.Printf("%s:\n", filepath.Base(filename))
+			if len(keys) > 1 {
+				fmt.Printf("%s:\n", filepath.Base(filename))
+			}
 			fmt.Print(string(newContent))
 			if changeCount > 1 { // if this wasn't last change, print newline
 				fmt.Println()

internal/lsp/lsp_test.go

@@ -564,7 +564,10 @@ func (r *runner) Rename(t *testing.T, data tests.Renames) {
 			}
 			filename := filepath.Base(m.URI.Filename())
 			contents := applyEdits(string(m.Content), sedits)
-			res = append(res, fmt.Sprintf("%s:\n%s", filename, contents))
+			if len(*workspaceEdits.Changes) > 1 {
+				contents = fmt.Sprintf("%s:\n%s", filename, contents)
+			}
+			res = append(res, contents)
 		}
 
 		// Sort on filename

internal/lsp/source/source_test.go

@@ -687,7 +687,10 @@ func (r *runner) Rename(t *testing.T, data tests.Renames) {
 				t.Fatal(err)
 			}
 			contents := applyEdits(string(data), diffEdits)
-			res = append(res, fmt.Sprintf("%s:\n%s", filename, contents))
+			if len(changes) > 1 {
+				contents = fmt.Sprintf("%s:\n%s", filename, contents)
+			}
+			res = append(res, contents)
 		}
 
 		// Sort on filename

internal/lsp/testdata/rename/a/random.go.golden

@@ -19,7 +19,6 @@
  func sw() {
 
 -- GetSum-rename --
-random.go:
 package a
 
 import (
@@ -85,7 +84,6 @@ func sw() {
  }
 
 -- f2name-rename --
-random.go:
 package a
 
 import (
@@ -151,7 +149,6 @@ func sw() {
  }
 
 -- f2y-rename --
-random.go:
 package a
 
 import (
@@ -217,7 +214,6 @@ func sw() {
  }
 
 -- fmt2-rename --
-random.go:
 package a
 
 import (
@@ -284,7 +280,6 @@ func sw() {
  	default:
 
 -- fmty-rename --
-random.go:
 package a
 
 import (
@@ -351,7 +346,6 @@ func sw() {
  	default:
 
 -- format-rename --
-random.go:
 package a
 
 import (
@@ -418,7 +412,6 @@ func sw() {
  	}
 
 -- log-rename --
-random.go:
 package a
 
 import (
@@ -481,7 +474,6 @@ func sw() {
  func _() {
 
 -- myX-rename --
-random.go:
 package a
 
 import (
@@ -541,7 +533,6 @@ func sw() {
  func sw() {
 
 -- pos-rename --
-random.go:
 package a
 
 import (
@@ -607,7 +598,6 @@ func sw() {
  }
 
 -- y0-rename --
-random.go:
 package a
 
 import (
@@ -673,7 +663,6 @@ func sw() {
  }
 
 -- y1-rename --
-random.go:
 package a
 
 import (
@@ -739,7 +728,6 @@ func sw() {
  }
 
 -- y2-rename --
-random.go:
 package a
 
 import (
@@ -805,7 +793,6 @@ func sw() {
  }
 
 -- y3-rename --
-random.go:
 package a
 
 import (
@@ -865,7 +852,6 @@ func sw() {
  type Pos struct {
 
 -- z-rename --
-random.go:
 package a
 
 import (

internal/lsp/testdata/rename/testy/testy.go.golden

@@ -10,7 +10,6 @@
  }
 
 -- bar-rename --
-testy.go:
 package testy
 
 type tt int //@rename("tt", "testyType")
@@ -32,7 +31,6 @@ func a() {
  	foo := 42 //@rename("foo", "bar")
 
 -- testyType-rename --
-testy.go:
 package testy
 
 type testyType int //@rename("tt", "testyType")

internal/lsp/testdata/rename/testy/testy_test.go.golden

@@ -52,7 +52,6 @@ func TestSomething(t *testing.T) {
  }
 
 -- testyX-rename --
-testy_test.go:
 package testy
 
 import "testing"