Remove deprecated ioutil and unused function

main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -24,18 +23,6 @@ func getenvStr(key string) (string, error) {
 	return v, nil
 }
 
-func getenvInt(key string, def int) (int, error) {
-	s, err := getenvStr(key)
-	if err != nil {
-		return 0, err
-	}
-	v, err := strconv.Atoi(s)
-	if err != nil {
-		return 0, err
-	}
-	return v, nil
-}
-
 func getenvBool(key string) (bool, error) {
 	s, err := getenvStr(key)
 	if err != nil {
@@ -76,10 +63,10 @@ func doesFileMatch(path string, include string, exclude string) bool {
 
 func findAndReplace(path string, find string, replace string, regex bool) (bool, error) {
 	if find != replace {
-		read, readErr := ioutil.ReadFile(path)
+		read, readErr := os.ReadFile(path)
 		check(readErr)
 
-		var newContents = ""
+		newContents := ""
 		if regex {
 			re := regexp.MustCompile(find)
 			newContents = re.ReplaceAllString(string(read), replace)
@@ -88,7 +75,7 @@ func findAndReplace(path string, find string, replace string, regex bool) (bool,
 		}
 
 		if newContents != string(read) {
-			writeErr := ioutil.WriteFile(path, []byte(newContents), 0)
+			writeErr := os.WriteFile(path, []byte(newContents), 0)
 			check(writeErr)
 			return true, nil
 		}
@@ -99,15 +86,14 @@ func findAndReplace(path string, find string, replace string, regex bool) (bool,
 
 func setGithubEnvOutput(key string, value int) {
 	outputFilename := os.Getenv("GITHUB_OUTPUT")
-	f, err := os.OpenFile(outputFilename,
-			os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
-		if err != nil {
-			log.Println(err)
-		}
-		defer f.Close()
-		if _, err := f.WriteString(fmt.Sprintf("%s=%d\n", key, value)); err != nil {
-			log.Println(err)
-		}
+	f, err := os.OpenFile(outputFilename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
+	if err != nil {
+		log.Println(err)
+	}
+	defer f.Close()
+	if _, err := fmt.Fprintf(f, "%s=%d\n", key, value); err != nil {
+		log.Println(err)
+	}
 }
 
 func main() {

main_test.go

@@ -1,27 +1,26 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 )
 
 func TestHappyPath(t *testing.T) {
-	_ = os.Mkdir("out", 0755)
+	_ = os.Mkdir("out", 0o755)
 
-	if err := ioutil.WriteFile("out/data.txt", []byte("Hello world\n"), 0644); err != nil {
+	if err := os.WriteFile("out/data.txt", []byte("Hello world\n"), 0o644); err != nil {
 		t.Error(err)
 	}
 
-	os.Setenv("INPUT_INCLUDE", "out/data.txt")
-	os.Setenv("INPUT_EXCLUDE", "")
-	os.Setenv("INPUT_FIND", "world")
-	os.Setenv("INPUT_REPLACE", "there")
-	os.Setenv("GITHUB_OUTPUT", "out/output.txt")
+	t.Setenv("INPUT_INCLUDE", "out/data.txt")
+	t.Setenv("INPUT_EXCLUDE", "")
+	t.Setenv("INPUT_FIND", "world")
+	t.Setenv("INPUT_REPLACE", "there")
+	t.Setenv("GITHUB_OUTPUT", "out/output.txt")
 
 	main()
 
-	data, err := ioutil.ReadFile("out/data.txt")
+	data, err := os.ReadFile("out/data.txt")
 	if err != nil {
 		t.Error(err)
 	}