Question

我正在尝试创建一个小的构建脚本，如果没有在默认路径中找到它们，它将询问用户mysql标头的位置。现在，我正在使用inquirer来提示用户输入正常，但是我遇到了以下问题：

'use strict'
const inquirer = require('inquirer')
const fs = require('fs')

const MYSQL_INCLUDE_DIR = '/usr/include/mysql'

let questions = [
  {
    type: 'input',
    name: 'MYSQL_INCLUDE_DIR',
    message: 'Enter path to mysql headers',
    default: MYSQL_INCLUDE_DIR,
    when: (answers) => {
      return !fs.existsSync(MYSQL_INCLUDE_DIR)
    },
    validate: (path) => {
      return fs.existsSync(path)
    }
  }
]

inquirer.prompt(questions)
  .then((answers) => {
    // Problem is that answers.MYSQL_INCLUDE_DIR might be undefined at this point.
  })

如果找到mysql标头的默认路径，则不会显示问题，因此将不设置答案。如何在不向用户实际显示问题的情况下设置问题的默认值？

解决上述问题也可以代替使用全局变量来做到这一点：

let questions = [
  {
    type: 'input',
    name: 'MYSQL_INCLUDE_DIR',
    message: 'Enter path to mysql headers',
    default: MYSQL_INCLUDE_DIR,
    when: (answers) => {
      return !fs.existsSync(answers.MYSQL_INCLUDE_DIR)
    },
    validate: (path) => {
      return fs.existsSync(path)
    }
  }
]

Answer 1

怎么样：

object

或更简洁地说：

>>> A = np.array([[1,2,3],
...               [1,2,3],
...               [1,2,3]])
>>> A
array([[1, 2, 3],
       [1, 2, 3],
       [1, 2, 3]])

或更一般地，在lodash的帮助下，类似：

inquirer.prompt(questions)
  .then((answers) => {
    const mysqlIncludeDir = answers && answers.MYSQL_INCLUDE_DIR ? answers.MYSQL_INCLUDE_DIR : MYSQL_INCLUDE_DIR;
  })

最后一个解决方案应该引起任何问题，其中包含一个inquirer.prompt(questions) .then((answers) => { const theAnswers = { MYSQL_INCLUDE_DIR, ...answers }; // theAnswers should be the answers you want const mysqlIncludeDir = theAnswers.MYSQL_INCLUDE_DIR; // mysqlIncludeDir should now be same as first solution above })和一个const myPrompt = (questions) => inquirer.prompt(questions) .then((answers) => { return { ...(_.omitBy(_.mapValues(_.keyBy(questions, 'name'), 'default'), q => !q)), ...answers }; }) myPrompt(questions) .then((answers) => { // should be the answers you want })，否则它们可能会隐藏其默认值，从而将其默认值强制包含在答案中。

如何使用查询器设置答案的默认值？

1 个答案: