custom_cmd/init_npm_pkg.js

## 1.创建 npm 包，在其中创建命令

#!/usr/bin/env node
const commander = require('commander')
const inquirer = require('inquirer')
const shell = require('shelljs')

let program = commander.createCommand()
program.version(require('./package.json').version)

const initAction = () => {
    inquirer.prompt([{
        type: 'input', // 提示项类型
        message: '请输入包名:', // 提示项信息
        name: 'name' // 提示标项识
    }]).then((answers) => {
        // 回车后的业务逻辑

        console.log('* 开始创建...')
        let pkgName = answers.name
        shell.exec(`
                mkdir ${pkgName} && \
                cd ${pkgName} && \
echo '{
  "name": "${pkgName}",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \\"Error: no test specified\\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}' > package.json && \
                mkdir src && \
                touch src/index.js && \
                echo "console.log('hi!')" > src/index.js
              `, (error, stdout, stderr) => {

            if (error) {
                console.error(`exec error: ${error}`)
                return
            }
            // console.log(`${stdout}`)
            // console.log(`${stderr}`)

            console.log('* 创建成功')
        });

    })
}

program
    .description('创建一个 NPM 初始包')//命令描述
    .action(initAction)//操作

program.parse(process.argv)