remove the use of depreceated pacakge ioutil and comply with gopls linter

cmd/golden_test.go

@@ -4,8 +4,9 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"os/exec"
+	"time"
 )
 
 func init() {
@@ -25,29 +26,33 @@ func ensureLF(content []byte) []byte {
 // If contents are equal, it returns nil.
 // If not, it returns which files are not equal
 // and diff (if system has diff command) between these files.
-func compareFiles(pathA, pathB string) error {
-	contentA, err := ioutil.ReadFile(pathA)
+func compareFiles(generated, golden string) error {
+	contentA, err := os.ReadFile(generated)
 	if err != nil {
 		return err
 	}
-	contentB, err := ioutil.ReadFile(pathB)
+	contentB, err := os.ReadFile(golden)
 	if err != nil {
 		return err
 	}
+
+	// change year to current year
+	contentB = bytes.ReplaceAll(contentB, []byte("2022"), []byte(time.Now().Format("2006")))
+
 	if !bytes.Equal(ensureLF(contentA), ensureLF(contentB)) {
 		output := new(bytes.Buffer)
-		output.WriteString(fmt.Sprintf("%q and %q are not equal!\n\n", pathA, pathB))
+		output.WriteString(fmt.Sprintf("%q and %q are not equal!\n\n", generated, golden))
 
 		diffPath, err := exec.LookPath("diff")
 		if err != nil {
 			// Don't execute diff if it can't be found.
 			return nil
 		}
-		diffCmd := exec.Command(diffPath, "-u", "--strip-trailing-cr", pathA, pathB)
+		diffCmd := exec.Command(diffPath, "-u", "--strip-trailing-cr", generated, golden)
 		diffCmd.Stdout = output
 		diffCmd.Stderr = output
 
-		output.WriteString("$ diff -u " + pathA + " " + pathB + "\n")
+		output.WriteString("$ diff -u " + generated + " " + golden + "\n")
 		if err := diffCmd.Run(); err != nil {
 			output.WriteString("\n" + err.Error())
 		}

cmd/init_test.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -23,11 +22,7 @@ func getProject() *Project {
 }
 
 func TestGoldenInitCmd(t *testing.T) {
-
-	dir, err := ioutil.TempDir("", "cobra-init")
-	if err != nil {
-		t.Fatal(err)
-	}
+	dir := filepath.Join(os.TempDir(), "cobra-init")
 	defer os.RemoveAll(dir)
 
 	tests := []struct {
@@ -46,7 +41,6 @@ func TestGoldenInitCmd(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-
 			viper.Set("useViper", true)
 			viper.Set("license", "apache")
 			projectPath, err := initializeProject(tt.args)

cmd/licenses.go

@@ -16,7 +16,7 @@
 package cmd
 
 import (
-	"fmt"
+	"errors"
 	"strings"
 	"time"
 
@@ -64,8 +64,10 @@ func getLicense() License {
 
 	// If user wants to have custom license, use that.
 	if viper.IsSet("license.header") || viper.IsSet("license.text") {
-		return License{Header: viper.GetString("license.header"),
-			Text: viper.GetString("license.text")}
+		return License{
+			Header: viper.GetString("license.header"),
+			Text:   viper.GetString("license.text"),
+		}
 	}
 
 	// If user wants to have built-in license, use that.
@@ -94,7 +96,7 @@ func copyrightLine() string {
 func findLicense(name string) License {
 	found := matchLicense(name)
 	if found == "" {
-		cobra.CheckErr(fmt.Errorf("unknown license: " + name))
+		cobra.CheckErr(errors.New("unknown license: " + name))
 	}
 	return Licenses[found]
 }