GO：交互式命令行工具 survey

简介

survey 可以让你方便的在终端上构建交互式和可访问提示的应用，支持ANSI

一、内置的Validators

• Required 要求必填
• MinLength(n) 输入字符最小长度验证
• MaxLength(n) 输入字符最大长度验证
• MaxItems(n) 选项最多验证
• MinItems(n) 选项最小验证

二、安装

go get github.com/AlecAivazis/survey/v2

三、测试用例

代码模块：

package main
 
import (
    "fmt"
    "github.com/AlecAivazis/survey/v2"
)
 
// the questions to ask
var qs = []*survey.Question{
    {
        Name:     "name",
        Prompt:   &survey.Input{Message: "What is your name?"},
        Validate: survey.Required,
        Transform: survey.Title,
    },
    {
        Name: "color",
        Prompt: &survey.Select{
            Message: "Choose a color:",
            Options: []string{"red", "blue", "green"},
            Default: "red",
        },
    },
    {
        Name: "age",
        Prompt:   &survey.Input{Message: "How old are you?"},
    },
}
 
func main() {
    // 结果写入到结构体
    answers := struct {
        Name          string                  // survey 会默认匹配首字母小写的name
        FavoriteColor string `survey:"color"` // 或者你也可以用tag指定如何匹配
        Age           int                     // 如果类型不一致，survey会尝试转换
    }{}
 
    // 执行提问
    err := survey.Ask(qs, &answers)
    if err != nil {
        fmt.Println(err.Error())
        return
    }
 
    fmt.Printf("%s chose %s.", answers.Name, answers.FavoriteColor)
}

运行结果：

四、其他用法

** 文本输入**

name := ""
prompt := &survey.Input{
    Message: "ping",
}
survey.AskOne(prompt, &name)

** 多行输入**

text := ""
prompt := &survey.Multiline{
    Message: "ping",
}
survey.AskOne(prompt, &text)

** 密码输入**

password := ""
prompt := &survey.Password{
    Message: "Please type your password",
}
survey.AskOne(prompt, &password)

** 确认**

name := false
prompt := &survey.Confirm{
    Message: "Do you like pie?",
}
survey.AskOne(prompt, &name)

** 单选**

color := ""
prompt := &survey.Select{
    Message: "Choose a color:",
    Options: []string{"red", "blue", "green"},
}
survey.AskOne(prompt, &color)

** 多选**

days := []string{}
prompt := &survey.MultiSelect{
    Message: "What days do you prefer:",
    Options: []string{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"},
}
survey.AskOne(prompt, &days)

** 验证**

q := &survey.Question{
    Prompt: &survey.Input{Message: "Hello world validation"},
    Validate: func (val interface{}) error {
        // 自定义验证
        if str, ok := val.(string) ; !ok || len(str) > 10 {
            return errors.New("This response cannot be longer than 10 characters.")
        }
        return nil
    },
}
 
color := ""
prompt := &survey.Input{ Message: "Whats your name?" }
 
survey.AskOne(prompt, &color, survey.WithValidator(survey.Required))

小结

survey可以帮助我们快速开发出交互式命令行应用，使用简单，功能强大，文档齐全，欢迎使用

github地址：https://github.com/AlecAivazis/survey