Re-name MP3 files from its ID3 tag's title.

mp3-rename-util.ts

import * as fs from 'fs-extra'
import * as nodeID3 from 'node-id3'
import * as path from 'path'

const TARGET = 'au_kaiwa_1705_A'

const filePaths = fs.readdirSync(TARGET)
  .map((file) => path.join(process.cwd(), TARGET, file))
  .filter((filePath) => fs.existsSync(filePath))

console.log(filePaths)

const tags = filePaths
  .map((filePath) => {
    const obj = nodeID3.read(filePath)
    return { ...obj, filePath }
  })

console.log(tags)

const results = tags
  .map((tag) => {
    if (tag.trackNumber.length === 1) {
      tag = { ...tag, trackNumber: '0' + tag.trackNumber }
    }
    return tag
  })
  .map((tag) => {
    return {
      newFilePath: path.join(process.cwd(), `new_${TARGET}`, `${tag.trackNumber}_${tag.title}.mp3`),
      originalFilePath: tag.filePath,
    }
  })

console.log(results)

results.forEach((result) => {
  fs.copy(result.originalFilePath, result.newFilePath)
})

NHK出版 で購入したNHKラジオ英会話のファイル名がひどいことになっていたのでID3タグのtitleを元にリネームする。