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confirmation.go
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confirmation.go
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// Copyright 2021 Flant JSC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package input
import (
"bufio"
"fmt"
"os"
"strings"
terminal "golang.org/x/term"
"github.com/deckhouse/deckhouse/dhctl/pkg/log"
)
type Confirmation struct {
message string
defaultAnswer bool
}
func NewConfirmation() *Confirmation {
return &Confirmation{message: "Should we proceed?"}
}
func (c *Confirmation) WithYesByDefault() *Confirmation {
c.defaultAnswer = true
return c
}
func (c *Confirmation) WithMessage(m string) *Confirmation {
c.message = m
return c
}
func (c *Confirmation) Ask() bool {
if !terminal.IsTerminal(int(os.Stdin.Fd())) {
return c.defaultAnswer
}
reader := bufio.NewReader(os.Stdin)
for {
log.WarnF(fmt.Sprintf("%s [y/n]: ", c.message))
line, _, err := reader.ReadLine()
if err != nil {
log.ErrorF("can't read from stdin: %v\n", err)
return false
}
response := strings.ToLower(strings.TrimSpace(string(line)))
if response == "y" || response == "yes" {
log.InfoF("\r")
return true
} else if response == "n" || response == "no" {
log.InfoF("\r")
return false
}
log.InfoF("\r")
}
}