Returning to parent directory with the SD library

Question

I have a File variable called dir and i'm building a simple file explorer for my device. Is there a way to get a reference to dir's parent directory?

Answer 1

I don't think there is an inbuilt function returning the parent, but you could do:

FS &file_system = SD; // pick whichever file system you use
File get_parent(File dir) {
  String dirPath = dir.path();
  int lastSlashIndex = dirPath.lastIndexOf('/');
  if (lastSlashIndex != -1) {
    String parentDirPath = dirPath.substring(0, lastSlashIndex);
    File parentDir = file_system.open(parentDirPath.c_str());
    return parentDir;
  }
  return File();
}