手写脚手架并发布

准备工作

首先准备一个模板，上传至github或者gitlab，本文以github为例

需要使用的第三方库

• babel-cli/babel-env: 语法转换
• commander: 命令行工具
• download-git-repo: 用来下载远程模板
• inquirer: 交互式命令行工具
• ora: 显示loading动画
• chalk: 修改控制台输出内容样式
• log-symbols: 显示出 √ 或 × 等的图标

实现功能

• xiami、xiami -h、xiami –help可显示帮助信息
• xiami init templateName projectName 可从xiamijun/templateName 的远程仓库拉取模板

手写脚手架

新建空项目，npm init

安装依赖

npm install babel-cli babel-env chalk commander download-git-repo ini inquirer log-symbols ora –save

目录结构

├── bin
│   └── www             // 可执行文件
├── dist
    ├── ...             // 生成文件
└── src
    ├── index.js        // 主流程入口文件
    ├── init.js         // init command
    ├── main.js         //入口文件
    └── utils
        ├── constants.js // 定义常量
        ├── get.js       // 获取模板
├── .babelrc             // babel配置文件
├── package.json
├── README.md

package.json添加如下字段：

"bin": {
  "xiami": "./bin/www"
},
"scripts": {
  "compile": "babel src -d dist",
  "watch": "npm run compile -- --watch"
},

babel 配置

.bablerc文件：

{
    "presets": [
        [
            "env",
            {
                "targets": {
                    "node": "current"
                }
            }
        ]
    ]
}

src/main.js

import program from 'commander'
import {
  VERSION
} from './utils/constants'
import apply from './index'
import chalk from 'chalk'

// 定义action
let actionMap = {
  init: {
    description: 'generate a new project form a template',
    usages: [
      'xiami init templateName projectName'
    ]
  }
}

// 描述、别名、回调
Object.keys(actionMap).forEach(action => {
  program.command(action).description(actionMap[action].description).alias(actionMap[action].alias).action(() => {
    switch (action) {
      case 'init':
        apply(action, ...process.argv.slice(3))
        break;

      default:
        break;
    }
  })
})

// 帮助信息
function help() {
  console.log('\r\nUsage:');
  Object.keys(actionMap).forEach(action=>{
    actionMap[action].usages.forEach(usage=>{
      console.log(`-${usage}`);      
    })
  })
  console.log('\r');  
}

program.usage('<command>[options]')

program.on('-h',help)
program.on('--help',help)

// 版本号
program.version(VERSION,'-v --version').parse(process.argv)

// 不带参数时
if (!process.argv.slice(2).length) {
  program.outputHelp(make_green)
}

function make_green(text) {
  return chalk.green(text)
}

src/index.js

// 主的流程控制
let apply = (action, ...args) => {
  require(`./${action}`)(...args)
}

export default apply

src/init.js

import {
  downloadLocal
} from './utils/get'
import ora from 'ora'
import inquirer from 'inquirer'
import fs from 'fs'
import chalk from 'chalk'
import symbol from 'log-symbols'

let init = async (templateName, projectName) => {
  // 项目不存在
  if (!fs.existsSync(projectName)) {
    // 命令行交互
    inquirer.prompt([{
        name: 'description',
        message: 'Please enter the project description'
      },
      {
        name: 'author',
        message: 'Please enter the author name'
      }
    ]).then(async answer => {
      // 下载模板 选择模板
      let loading = ora('downloading template...')
      loading.start()
      downloadLocal(templateName, projectName).then(() => {
        loading.succeed()
        const fileName = `${projectName}/package.json`
        if (fs.existsSync(fileName)) {
          const data = fs.readFileSync(fileName).toString()
          let json = JSON.parse(data)
          json.name = projectName
          json.author = answer.author
          json.description = answer.description
          // 修改项目文件夹中 package.json 文件
          fs.writeFileSync(fileName, JSON.stringify(json, null, '\t'), 'utf-8')
          console.log(symbol.success, chalk.green('Project initialization finished!'));
        }
      }, () => {
        loading.fail()
      })
    })
  } else {
    console.log(symbol.error, chalk.red('The project already exists'));
  }
}

module.exports = init

src/utils/get.js

import {URL} from './constants'
import downloadGit from 'download-git-repo'

export const downloadLocal = (templateName, projectName) => {
  let api = `${URL}/${templateName}`
  return new Promise((resolve, reject) => {
    //projectName 为下载到的本地目录
    downloadGit(api, projectName, err => {
      if (err) {
        reject(err)
      }
      resolve()
    })
  })
}

src/utils/constants.js

import {version} from '../../package.json'

export const VERSION=version

export const URL = 'xiamijun'

bin/www

#! /usr/bin/env node

require('../dist/main.js');

调试

运行npm run watch 进行打包

运行npm link将当前的xiami命令链接到全局环境

发布

• 首先切换至 https://registry.npmjs.org/ ，使用nrm或者npm config set
• 登录npm，输入npm login，输入用户名、密码、邮箱
• npm publish

项目地址

github地址：https://github.com/xiamijun/xiami-vue-cli

npm地址：https://www.npmjs.com/package/xiami-vue-cli