commander-scripts-ivan/commander-scripts-ivan-starter.js

Node.js命令行脚本

#!/usr/bin/env node

/* eslint-disable no-console, import/no-unresolved */
const path = require('path')
const { execSync } = require('child_process')
const chalk = require('chalk')
const commander = require('commander')
const fs = require('fs-extra')
const spawn = require('cross-spawn')
const validateProjectName = require('validate-npm-package-name')

const STARTER = 'web-scripts-ivan'

function red(...x) {
  return console.error(chalk.red(x.join('\n')))
}

// 创建项目指令处理
let name
commander.arguments('<project-directory>')
  .usage(`${chalk.cyan('starter')} ${chalk.green('<project-directory>')} [options...]`)
  .action((projectDirectory) => { name = projectDirectory })
  .allowUnknownOption()
  .parse(process.argv)

if (typeof name === 'undefined') {
  red('Please specify the project directory:')
  process.exit(1)
}

// 检查项目名合法性
const validationResult = validateProjectName(name)
if (!validationResult.validForNewPackages) {
  console.error(`Could not create a project called ${chalk.red(`"${name}"`)} because of npm naming restrictions:`)
  red(validationResult.errors)
  red(validationResult.warnings)
  process.exit(1)
}

// 检查项目名文件夹是否不存在
if (fs.existsSync(name)) {
  console.log(`The directory ${chalk.red(name)} exists!`)
  process.exit(1)
}

function shouldUse() {
  try {
    execSync('yarn --version', { stdio: 'ignore' })
    return {
      command: 'yarn',
      args: ['add', '-D', '-E', STARTER],
    }
  } catch (err) {
    return {
      command: 'npm',
      args: ['install', '-D', '-E', STARTER],
    }
  }
}

Promise.resolve(STARTER)
  .then((packageName) => {
    fs.ensureDirSync(name) // Like mkdir -p
    const root = path.resolve(name) // 把一个路径或路径片段的序列解析为一个绝对路径

    const packageJson = { name, version: '0.0.1', private: true }
    fs.writeFileSync(path.join(root, 'package.json'), JSON.stringify(packageJson, null, 2))

    process.chdir(root)
    console.log(chalk.cyan('Installing packages. This might take a couple of minutes...\n\n'))

    const { args, command } = shouldUse()
    // 异步执行npm install指令以promise resolve得到
    const child = spawn.sync(command, args, { stdio: 'inherit' })
    if (child.status !== 0) {
      red('\n\nAborting installation.')
      // 删除文件夹
      fs.removeSync(path.join(root))
      process.exit(1)
    }
    console.log(chalk.green(`\n\n${packageName} has been installed...\n\n`))

    // 执行对应打包库里的文件配置
    const scriptsPath = path.resolve(
      process.cwd(),
      'node_modules',
      packageName,
      'init.js',
    )
    const init = require(scriptsPath) // eslint-disable-line
    init(root, name)
  })
  .catch((error) => {
    console.error(chalk.red('\n\nExecute init script failed...'))
    if (error) {
      console.error(error)
    }
    // 删除文件夹
    fs.removeSync(path.join(root))
    process.exit(1)
  })