🎨 Fix padding around app name in startup message when containing non-ascii characters (#1987)

* Fix padding around app name in startup message when it contains non-ascii characters

* fix conflict, allow ending space only for odd length strings

* move startup message tests to listen_test.go

app_test.go

@@ -10,16 +10,13 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"log"
 	"mime/multipart"
 	"net"
 	"net/http"
 	"net/http/httptest"
-	"os"
 	"reflect"
 	"regexp"
 	"strings"
-	"sync"
 	"testing"
 	"time"
 
@@ -1348,59 +1345,6 @@ func Test_App_SmallReadBuffer(t *testing.T) {
 	utils.AssertEqual(t, nil, app.Listen(":4006"))
 }
 
-func captureOutput(f func()) string {
-	reader, writer, err := os.Pipe()
-	if err != nil {
-		panic(err)
-	}
-	stdout := os.Stdout
-	stderr := os.Stderr
-	defer func() {
-		os.Stdout = stdout
-		os.Stderr = stderr
-		log.SetOutput(os.Stderr)
-	}()
-	os.Stdout = writer
-	os.Stderr = writer
-	log.SetOutput(writer)
-	out := make(chan string)
-	wg := new(sync.WaitGroup)
-	wg.Add(1)
-	go func() {
-		var buf bytes.Buffer
-		wg.Done()
-		io.Copy(&buf, reader)
-		out <- buf.String()
-	}()
-	wg.Wait()
-	f()
-	writer.Close()
-	return <-out
-}
-
-func Test_App_Master_Process_Show_Startup_Message(t *testing.T) {
-	startupMessage := captureOutput(func() {
-		New(Config{Prefork: true}).
-			startupMessage(":3000", true, strings.Repeat(",11111,22222,33333,44444,55555,60000", 10))
-	})
-	fmt.Println(startupMessage)
-	utils.AssertEqual(t, true, strings.Contains(startupMessage, "https://127.0.0.1:3000"))
-	utils.AssertEqual(t, true, strings.Contains(startupMessage, "(bound on host 0.0.0.0 and port 3000)"))
-	utils.AssertEqual(t, true, strings.Contains(startupMessage, "Child PIDs"))
-	utils.AssertEqual(t, true, strings.Contains(startupMessage, "11111, 22222, 33333, 44444, 55555, 60000"))
-	utils.AssertEqual(t, true, strings.Contains(startupMessage, "Prefork ........ Enabled"))
-}
-
-func Test_App_Master_Process_Show_Startup_MessageWithAppName(t *testing.T) {
-	app := New(Config{Prefork: true, AppName: "Test App v1.0.1"})
-	startupMessage := captureOutput(func() {
-		app.startupMessage(":3000", true, strings.Repeat(",11111,22222,33333,44444,55555,60000", 10))
-	})
-	fmt.Println(startupMessage)
-	utils.AssertEqual(t, "Test App v1.0.1", app.Config().AppName)
-	utils.AssertEqual(t, true, strings.Contains(startupMessage, app.Config().AppName))
-}
-
 func Test_App_Server(t *testing.T) {
 	app := New()
 

listen.go

@@ -208,11 +208,12 @@ func (app *App) startupMessage(addr string, tls bool, pids string) {
 	}
 
 	centerValue := func(s string, width int) string {
-		pad := strconv.Itoa((width - len(s)) / 2)
+		pad := strconv.Itoa((width - len([]rune(s))) / 2)
 		str := fmt.Sprintf("%"+pad+"s", " ")
 		str += fmt.Sprintf("%s%s%s", colors.Cyan, s, colors.Black)
 		str += fmt.Sprintf("%"+pad+"s", " ")
-		if len(str)-10 < width {
+		if len([]rune(str))-10 < width && len([]rune(str))%2 != 0 {
+			// add an ending space if the length of str is odd and str is not too long
 			str += " "
 		}
 		return str

listen_test.go

@@ -5,9 +5,14 @@
 package fiber
 
 import (
+	"bytes"
 	"crypto/tls"
 	"fmt"
+	"io"
+	"log"
+	"os"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 
@@ -140,6 +145,69 @@ func Test_App_Listener_TLS_Listener(t *testing.T) {
 	utils.AssertEqual(t, nil, app.Listener(ln))
 }
 
+func captureOutput(f func()) string {
+	reader, writer, err := os.Pipe()
+	if err != nil {
+		panic(err)
+	}
+	stdout := os.Stdout
+	stderr := os.Stderr
+	defer func() {
+		os.Stdout = stdout
+		os.Stderr = stderr
+		log.SetOutput(os.Stderr)
+	}()
+	os.Stdout = writer
+	os.Stderr = writer
+	log.SetOutput(writer)
+	out := make(chan string)
+	wg := new(sync.WaitGroup)
+	wg.Add(1)
+	go func() {
+		var buf bytes.Buffer
+		wg.Done()
+		io.Copy(&buf, reader)
+		out <- buf.String()
+	}()
+	wg.Wait()
+	f()
+	writer.Close()
+	return <-out
+}
+
+func Test_App_Master_Process_Show_Startup_Message(t *testing.T) {
+	startupMessage := captureOutput(func() {
+		New(Config{Prefork: true}).
+			startupMessage(":3000", true, strings.Repeat(",11111,22222,33333,44444,55555,60000", 10))
+	})
+	fmt.Println(startupMessage)
+	utils.AssertEqual(t, true, strings.Contains(startupMessage, "https://127.0.0.1:3000"))
+	utils.AssertEqual(t, true, strings.Contains(startupMessage, "(bound on host 0.0.0.0 and port 3000)"))
+	utils.AssertEqual(t, true, strings.Contains(startupMessage, "Child PIDs"))
+	utils.AssertEqual(t, true, strings.Contains(startupMessage, "11111, 22222, 33333, 44444, 55555, 60000"))
+	utils.AssertEqual(t, true, strings.Contains(startupMessage, "Prefork ........ Enabled"))
+}
+
+func Test_App_Master_Process_Show_Startup_MessageWithAppName(t *testing.T) {
+	app := New(Config{Prefork: true, AppName: "Test App v1.0.1"})
+	startupMessage := captureOutput(func() {
+		app.startupMessage(":3000", true, strings.Repeat(",11111,22222,33333,44444,55555,60000", 10))
+	})
+	fmt.Println(startupMessage)
+	utils.AssertEqual(t, "Test App v1.0.1", app.Config().AppName)
+	utils.AssertEqual(t, true, strings.Contains(startupMessage, app.Config().AppName))
+}
+
+func Test_App_Master_Process_Show_Startup_MessageWithAppNameNonAscii(t *testing.T) {
+	appName := "Serveur de vérification des données"
+	app := New(Config{Prefork: true, AppName: appName})
+	startupMessage := captureOutput(func() {
+		app.startupMessage(":3000", false, "")
+	})
+	fmt.Println(startupMessage)
+	utils.AssertEqual(t, true, strings.Contains(startupMessage, "│        Serveur de vérification des données        │"))
+}
+
 func Test_App_print_Route(t *testing.T) {
 	app := New(Config{EnablePrintRoutes: true})
 	app.Get("/", emptyHandler).Name("routeName")