Enhancement on Yesno()

Author: Liujingfang1

cmd/kubebuilder/initproject/project.go

@@ -17,6 +17,7 @@ limitations under the License.
 package initproject
 
 import (
+	"bufio"
 	"fmt"
 	"log"
 	"os"
@@ -71,8 +72,9 @@ func (o *projectOptions) RunInit() {
 	}
 
 	if !o.depFlag.Changed {
+		reader := bufio.NewReader(os.Stdin)
 		fmt.Println("Run `dep ensure` to fetch dependencies (Recommended) [y/n]?")
-		o.dep = util.Yesno()
+		o.dep = util.Yesno(reader)
 	}
 	if o.dep {
 		c := exec.Command("dep", "ensure") // #nosec

cmd/kubebuilder/util/stdin.go

@@ -18,21 +18,23 @@ package util
 
 import (
 	"bufio"
+	"fmt"
 	"log"
-	"os"
 	"strings"
 )
 
 // Yesno reads from stdin looking for one of "y", "yes", "n", "no" and returns
 // true for "y" and false for "n"
-func Yesno() bool {
-	reader := bufio.NewReader(os.Stdin)
+func Yesno(reader *bufio.Reader) bool {
 	for {
-		switch readstdin(reader) {
+		text := readstdin(reader)
+		switch text {
 		case "y", "yes":
 			return true
 		case "n", "no":
 			return false
+		default:
+			fmt.Printf("invalid input %q, should be [y/n]", text)
 		}
 	}
 }
@@ -42,7 +44,7 @@ func Yesno() bool {
 func readstdin(reader *bufio.Reader) string {
 	text, err := reader.ReadString('\n')
 	if err != nil {
-		log.Fatal(err)
+		log.Fatalf("Error when reading input: %v", err)
 	}
 	return strings.TrimSpace(text)
 }

cmd/kubebuilder/v1/api.go

@@ -17,6 +17,7 @@ limitations under the License.
 package v1
 
 import (
+	"bufio"
 	"fmt"
 	"log"
 	"os"
@@ -44,13 +45,14 @@ type apiOptions struct {
 func (o *apiOptions) RunAddAPI() {
 	dieIfNoProject()
 
+	reader := bufio.NewReader(os.Stdin)
 	if !o.resourceFlag.Changed {
 		fmt.Println("Create Resource under pkg/apis [y/n]?")
-		o.doResource = util.Yesno()
+		o.doResource = util.Yesno(reader)
 	}
 	if !o.controllerFlag.Changed {
 		fmt.Println("Create Controller under pkg/controller [y/n]?")
-		o.doController = util.Yesno()
+		o.doController = util.Yesno(reader)
 	}
 
 	fmt.Println("Writing scaffold for you to edit...")