convert xls to xlsx by nodejs

xls2xlsx.js

// https://www.npmjs.com/package/xlsx#installation
const xlsx = require('xlsx')
const fs = require('fs')
const Path = require('path')

const printHelp = () => {
  console.log('Usage: convert.js <input.xls> [<output>]')
}

const parseOutput = (input, output) => {
  let outDir
  let i = Path.parse(input)
  if (output) {
    let o = Path.parse(output)
    if (o.ext === '.xlsx') {
      return output
    }
    // 指定的是一个目录
    outDir = output
  } else {
    outDir = i.dir
  }
  let filename = Path.join(outDir, `${i.name}.xlsx`)
  if (fs.existsSync(filename)) {
    filename = Path.join(outDir, `${i.name}-${new Date().toJSON().replace(/[-:]/g, '')}.xlsx`)
  }
  return filename
}

const convert = (input, output) => {
  const file = xlsx.readFileSync(input, { type: 'file'})
  output = parseOutput(input, output)
  xlsx.writeFileSync(file, output, { type: 'file'})
  console.log(`convert '${input}' --> '${output}'`)
}

const main = async () => {
  const input = process.argv[2]
  const output = process.argv[3]
  if (!input) {
    printHelp()
    console.error('缺少 xls 文件参数');
    process.exit(1)
  }
  if (!input.endsWith('.xls')) {
    console.error('不是 xls 文件');
    process.exit(1)
  }
  if (!fs.existsSync(input)) {
    console.error(`文件不存在 ${input}`);
    process.exit(1)
  }

  convert(input, output)
}

if (require.main === module) {
  main()
}