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prompts.go
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104 lines (92 loc) · 2.49 KB
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/*
* Copyright 2018- The Pixie Authors.
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package components
import (
"bufio"
"fmt"
"os"
"strings"
"github.com/spf13/viper"
)
// This file has components that interact with the user via prompts.
// Prompter proves a user input dialog.
type Prompter struct {
message string
choices []string
dv string
}
// NewPrompter creates a Prompter with the given message, choices and defaults.
func NewPrompter(message string, choices []string, defaultValue string) *Prompter {
return &Prompter{
message: message,
choices: choices,
dv: defaultValue,
}
}
// Prompt prompts the user and return the value. If the config parameter "y" is set we will return the default.
func (p *Prompter) Prompt() string {
if p.skip() {
return p.dv
}
fmt.Print(p.msg())
input := ""
s := bufio.NewScanner(os.Stdin)
ok := s.Scan()
if ok {
input = strings.TrimRight(s.Text(), "\r\n")
}
if input == "" {
return p.dv
}
if !p.validInput(input) {
fmt.Println(p.errorMsg())
return p.Prompt()
}
return input
}
func (p *Prompter) validInput(s string) bool {
// Compare values ignoring case.
ls := strings.ToLower(s)
for i := range p.choices {
if ls == strings.ToLower(p.choices[i]) {
return true
}
}
return false
}
func (p *Prompter) msg() string {
defaultValue := ""
if p.dv != "" {
defaultValue = fmt.Sprintf("[%s] ", p.dv)
}
return fmt.Sprintf("%s (%s) %s: ", p.message, strings.Join(p.choices, "/"), defaultValue)
}
func (p *Prompter) errorMsg() string {
return fmt.Sprintf("Invalid input, must be one of: [%s]", strings.Join(p.choices, ", "))
}
func (p *Prompter) skip() bool {
return viper.GetBool("y")
}
// YNPrompt is a helper function that prompts the user for a Y/N response.
func YNPrompt(message string, defaultValue bool) bool {
defaultChoice := "n"
if defaultValue {
defaultChoice = "y"
}
return strings.ToLower(NewPrompter(message, []string{"y", "n"}, defaultChoice).Prompt()) == "y"
}