仿vue-cli搭建属于自己的脚手架的方法步骤

const program = require("commander");
// 定义指令
program
 .version('0.0.1')
 .command('init', 'Generate a new project from a template')
 .action(() => {
 // 回调函数
 })
// 解析命令行参数
program.parse(process.argv);

const inquirer = require('inquirer');
inquirer
 .prompt([
 // 一些交互式的问题
 ])
 .then(answers => {
 // 回调函数，answers 就是用户输入的内容，是个对象
 });

const chalk = require('chalk');
console.log(chalk.green('success'));
console.log(chalk.red('error'));

const ora = require('ora')
let spinner = ora('downloading template ...')
spinner.start()

const download = require('download-git-repo')
download(repository, destination, options, callback)

"dependencies": {
 "chalk": "^2.4.2",
 "commander": "^2.19.0",
 "download-git-repo": "^1.1.0",
 "inquirer": "^6.2.2",
 "ora": "^3.2.0"
}

#!/usr/bin/env node
console.log('hello');

#!/usr/bin/env node
const program = require('commander')

// 定义当前版本
// 定义使用方法
// 定义四个指令
program
 .version(require('../package').version)
 .usage('<command> [options]')
 .command('add', 'add a new template')
 .command('delete', 'delete a template')
 .command('list', 'list all the templates')
 .command('init', 'generate a new project from a template')
 
// 解析命令行参数
program.parse(process.argv)

// bin 用来指定每个命令所对应的可执行文件的位置
"bin": {
 "xr": "bin/xr"
}

"bin": {
 "xr": "bin/xr",
 "xr-add": "bin/xr-add",
 "xr-delete": "bin/xr-delete",
 "xr-list": "bin/xr-list",
 "xr-init": "bin/xr-init"
}

#!/usr/bin/env node

// 交互式命令行
const inquirer = require('inquirer')
// 修改控制台字符串的样式
const chalk = require('chalk')
// node 内置文件模块
const fs = require('fs')
// 读取根目录下的 template.json
const tplObj = require(`${__dirname}/../template`)

// 自定义交互式命令行的问题及简单的校验
let question = [
 {
 name: "name",
 type: 'input',
 message: "请输入模板名称",
 validate (val) {
  if (val === '') {
  return 'Name is required!'
  } else if (tplObj[val]) {
  return 'Template has already existed!'
  } else {
  return true
  }
 }
 },
 {
 name: "url",
 type: 'input',
 message: "请输入模板地址",
 validate (val) {
  if (val === '') return 'The url is required!'
  return true
 }
 }
]

inquirer
 .prompt(question).then(answers => {
 // answers 就是用户输入的内容，是个对象
 let { name, url } = answers;
 // 过滤 unicode 字符
 tplObj[name] = url.replace(/[\u0000-\u0019]/g, '')
 // 把模板信息写入 template.json 文件中
 fs.writeFile(`${__dirname}/../template.json`, JSON.stringify(tplObj), 'utf-8', err => {
  if (err) console.log(err)
  console.log('\n')
  console.log(chalk.green('Added successfully!\n'))
  console.log(chalk.grey('The latest template list is: \n'))
  console.log(tplObj)
  console.log('\n')
 })
 })

#!/usr/bin/env node

const inquirer = require('inquirer')
const chalk = require('chalk')
const fs = require('fs')
const tplObj = require(`${__dirname}/../template`)

let question = [
 {
 name: "name",
 message: "请输入要删除的模板名称",
 validate (val) {
  if (val === '') {
  return 'Name is required!'
  } else if (!tplObj[val]) {
  return 'Template does not exist!'
  } else {
  return true
  }
 }
 }
]

inquirer
 .prompt(question).then(answers => {
 let { name } = answers;
 delete tplObj[name]
 // 更新 template.json 文件
 fs.writeFile(`${__dirname}/../template.json`, JSON.stringify(tplObj), 'utf-8', err => {
  if (err) console.log(err)
  console.log('\n')
  console.log(chalk.green('Deleted successfully!\n'))
  console.log(chalk.grey('The latest template list is: \n'))
  console.log(tplObj)
  console.log('\n')
 })
 })

#!/usr/bin/env node

const tplObj = require(`${__dirname}/../template`)
console.log(tplObj)

#!/usr/bin/env node

const program = require('commander')
const chalk = require('chalk')
const ora = require('ora')
const download = require('download-git-repo')
const tplObj = require(`${__dirname}/../template`)

program
 .usage('<template-name> [project-name]')
program.parse(process.argv)
// 当没有输入参数的时候给个提示
if (program.args.length < 1) return program.help()

// 好比 vue init webpack project-name 的命令一样，第一个参数是 webpack，第二个参数是 project-name
let templateName = program.args[0]
let projectName = program.args[1]
// 小小校验一下参数
if (!tplObj[templateName]) {
 console.log(chalk.red('\n Template does not exit! \n '))
 return
}
if (!projectName) {
 console.log(chalk.red('\n Project should not be empty! \n '))
 return
}

url = tplObj[templateName]

console.log(chalk.white('\n Start generating... \n'))
// 出现加载图标
const spinner = ora("Downloading...");
spinner.start();
// 执行下载方法并传入参数
download (
 url,
 projectName,
 err => {
 if (err) {
  spinner.fail();
  console.log(chalk.red(`Generation failed. ${err}`))
  return
 }
 // 结束加载图标
 spinner.succeed();
 console.log(chalk.green('\n Generation completed!'))
 console.log('\n To get started')
 console.log(`\n cd ${projectName} \n`)
 }
)