sigs.k8s.io/kubebuilder/v3@v3.14.0/pkg/plugin/util/stdin.go (about)

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package util
    18  
    19  import (
    20  	"bufio"
    21  	"fmt"
    22  	"log"
    23  	"strings"
    24  )
    25  
    26  // YesNo reads from stdin looking for one of "y", "yes", "n", "no" and returns
    27  // true for "y" and false for "n"
    28  func YesNo(reader *bufio.Reader) bool {
    29  	for {
    30  		text := readstdin(reader)
    31  		switch text {
    32  		case "y", "yes":
    33  			return true
    34  		case "n", "no":
    35  			return false
    36  		default:
    37  			fmt.Printf("invalid input %q, should be [y/n]", text)
    38  		}
    39  	}
    40  }
    41  
    42  // Readstdin reads a line from stdin trimming spaces, and returns the value.
    43  // log.Fatal's if there is an error.
    44  func readstdin(reader *bufio.Reader) string {
    45  	text, err := reader.ReadString('\n')
    46  	if err != nil {
    47  		log.Fatalf("Error when reading input: %v", err)
    48  	}
    49  	return strings.TrimSpace(text)
    50  }