Function duplicateFolder

apps/desktop/src/main/vault.ts:3471–3505

(
  root: string,
  topFolder: NoteFolder,
  subpath: string
)

 * the leaf name.
 */
export async function duplicateFolder(
  root: string,
  topFolder: NoteFolder,
  subpath: string
): Promise<string> {
  const clean = subpath.replace(/^\/+|\/+$/g, '')
  if (!clean) throw new Error('Cannot duplicate the top-level folder')
  const topRoot = await folderRoot(root, topFolder)
  const oldAbs = resolveSafe(topRoot, clean)
  const parentAbs = path.dirname(oldAbs)
  const baseName = path.basename(oldAbs)
  let copyName = `${baseName} copy`
  let n = 1
  while (true) {
    try {
      await fs.access(path.join(parentAbs, copyName))
      n += 1
      copyName = `${baseName} copy ${n}`
    } catch {
      break
    }
  }
  const newAbs = path.join(parentAbs, copyName)
  await fs.cp(oldAbs, newAbs, { recursive: true })
  const newSubpath = path.relative(topRoot, newAbs).split(path.sep).join('/')
  const settings = await getVaultSettings(root)
  const nextSettings: VaultSettings = {
    ...settings,
    folderIcons: duplicateFolderIcons(settings.folderIcons, topFolder, clean, newSubpath)
  }
  await setVaultSettings(root, nextSettings)
  invalidateNoteMetaCache(root)
  invalidateVaultTextSearchCache(root)
  return newSubpath
}

/** Build the absolute on-disk path for a vault folder / subfolder. */
export function folderAbsolutePath(