gopls: update uses of deprecated ioutil APIs

Change-Id: I35acdc8a1e8e558f905fd6879b3ac8332e7c2325
Reviewed-on: https://go-review.googlesource.com/c/tools/+/524836
Reviewed-by: Alan Donovan <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: qiulaidongfeng <[email protected]>
Run-TryBot: Robert Findley <[email protected]>

Author: findleyr

gopls/internal/lsp/cache/mod_tidy.go

@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"go/ast"
 	"go/token"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -118,7 +117,7 @@ func modTidyImpl(ctx context.Context, snapshot *snapshot, filename string, pm *s
 
 	// Go directly to disk to get the temporary mod file,
 	// since it is always on disk.
-	tempContents, err := ioutil.ReadFile(tmpURI.Filename())
+	tempContents, err := os.ReadFile(tmpURI.Filename())
 	if err != nil {
 		return nil, err
 	}

gopls/internal/lsp/cache/snapshot.go

@@ -14,7 +14,6 @@ import (
 	"go/token"
 	"go/types"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -456,11 +455,11 @@ func (s *snapshot) RunGoCommands(ctx context.Context, allowNetwork bool, wd stri
 		return false, nil, nil, nil
 	}
 	var modBytes, sumBytes []byte
-	modBytes, err = ioutil.ReadFile(tmpURI.Filename())
+	modBytes, err = os.ReadFile(tmpURI.Filename())
 	if err != nil && !os.IsNotExist(err) {
 		return false, nil, nil, err
 	}
-	sumBytes, err = ioutil.ReadFile(strings.TrimSuffix(tmpURI.Filename(), ".mod") + ".sum")
+	sumBytes, err = os.ReadFile(strings.TrimSuffix(tmpURI.Filename(), ".mod") + ".sum")
 	if err != nil && !os.IsNotExist(err) {
 		return false, nil, nil, err
 	}

gopls/internal/lsp/cache/view.go

@@ -11,7 +11,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -351,7 +350,7 @@ func (v *View) ID() string { return v.id }
 // longer needed.
 func tempModFile(modFh source.FileHandle, gosum []byte) (tmpURI span.URI, cleanup func(), err error) {
 	filenameHash := source.Hashf("%s", modFh.URI().Filename())
-	tmpMod, err := ioutil.TempFile("", fmt.Sprintf("go.%s.*.mod", filenameHash))
+	tmpMod, err := os.CreateTemp("", fmt.Sprintf("go.%s.*.mod", filenameHash))
 	if err != nil {
 		return "", nil, err
 	}
@@ -386,7 +385,7 @@ func tempModFile(modFh source.FileHandle, gosum []byte) (tmpURI span.URI, cleanu
 
 	// Create an analogous go.sum, if one exists.
 	if gosum != nil {
-		if err := ioutil.WriteFile(tmpSumName, gosum, 0655); err != nil {
+		if err := os.WriteFile(tmpSumName, gosum, 0655); err != nil {
 			return "", nil, err
 		}
 	}

gopls/internal/lsp/cache/view_test.go

@@ -6,7 +6,6 @@ package cache
 import (
 	"context"
 	"encoding/json"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -20,17 +19,14 @@ import (
 )
 
 func TestCaseInsensitiveFilesystem(t *testing.T) {
-	base, err := ioutil.TempDir("", t.Name())
-	if err != nil {
-		t.Fatal(err)
-	}
+	base := t.TempDir()
 
 	inner := filepath.Join(base, "a/B/c/DEFgh")
 	if err := os.MkdirAll(inner, 0777); err != nil {
 		t.Fatal(err)
 	}
 	file := filepath.Join(inner, "f.go")
-	if err := ioutil.WriteFile(file, []byte("hi"), 0777); err != nil {
+	if err := os.WriteFile(file, []byte("hi"), 0777); err != nil {
 		t.Fatal(err)
 	}
 	if _, err := os.Stat(filepath.Join(inner, "F.go")); err != nil {

gopls/internal/lsp/command.go

@@ -11,7 +11,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -629,7 +628,7 @@ func collectFileEdits(ctx context.Context, snapshot source.Snapshot, uri span.UR
 	// file and leave it unsaved. We would rather apply the changes directly,
 	// especially to go.sum, which should be mostly invisible to the user.
 	if !snapshot.IsOpen(uri) {
-		err := ioutil.WriteFile(uri.Filename(), newContent, 0666)
+		err := os.WriteFile(uri.Filename(), newContent, 0666)
 		return nil, err
 	}
 

gopls/internal/lsp/source/gc_annotations.go

@@ -9,7 +9,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -45,7 +44,7 @@ func GCOptimizationDetails(ctx context.Context, snapshot Snapshot, m *Metadata)
 	if err := os.MkdirAll(outDir, 0700); err != nil {
 		return nil, err
 	}
-	tmpFile, err := ioutil.TempFile(os.TempDir(), "gopls-x")
+	tmpFile, err := os.CreateTemp(os.TempDir(), "gopls-x")
 	if err != nil {
 		return nil, err
 	}
@@ -99,7 +98,7 @@ func GCOptimizationDetails(ctx context.Context, snapshot Snapshot, m *Metadata)
 }
 
 func parseDetailsFile(filename string, options *Options) (span.URI, []*Diagnostic, error) {
-	buf, err := ioutil.ReadFile(filename)
+	buf, err := os.ReadFile(filename)
 	if err != nil {
 		return "", nil, err
 	}