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【GAS】すでに同じフォルダ内に同一ファイル名が存在した時、連番をふって命名する

Driveは最近、ファイル自体をIDで管理するようになったので、ファイル名自体の重複を気にしなくなった。ひとえに不便なので機能を @acro5piano と協力して作成した。

function fileExists(files) {
  return files.hasNext()
}

function getNextFileNameFromOutputFolder(outputFolder, fileName, index) {
  index = index || 0
  var maybeFileName = index === 0
    ? fileName 
    : fileName + "" + index + ""
  if (fileExists(outputFolder.getFilesByName(maybeFileName))) {
    return getNextFileNameFromOutputFolder(outputFolder, fileName, index + 1)
  }
  return maybeFileName
}

function incrementFileNumber(OutputFileName, folderId) {
  var OutputFolder = DriveApp.getFolderById(folderId);
  return getNextFileNameFromOutputFolder(OutputFolder, OutputFileName)
}
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