listDir of SDIndex.h improvement

[hash6iron]

Hi @pschatzmann.

In occasions if it's avoided to deep search (all directories from parent directory set on player) for applications as audio player with browser (as my project) when one directory includes a lot of files and subdirectories with more files, the AudioKit works agilest.

The modification that I'm suggesting is below (or similar up to you).

I tested this one and works very fine, now AudioKit for example in that critical case it is not freezed and takes a short time to discover all files (only in the directory that user sees)

/// Writes the index file
  void listDir(Print &idxfile, const char *dirname) {
    LOGD("listDir: %s", dirname);
    FileT root = open(dirname);
    if (!root) {
      LOGE("Open failed: %s", dirname);
      popPath();
      return;
    }
    if (!isDirectory(root)) {
      LOGD("Is not directory: %s", dirname);
      popPath();
      return;
    }
    if (StrView(dirname).startsWith(".")) {
      LOGD("Invalid file: %s", dirname);
      popPath();
      return;
    }

    rewind(root);
    FileT file = openNext(root);
    while (file) {
      if (isDirectory(file)) {

                             <---------------------------- Here is the suggestion
        if( !disableDeepSearching ) {
           String name = String(fileNamePath(file));
           LOGD("name: %s", name.c_str());
           pushPath(fileName(file));
           listDir(idxfile, name.c_str());
         }
                             ----------------------------->
      } else {
        const char *fn = fileNamePath(file);
        if (isValidAudioFile(file)) {
          LOGD("Adding file to index: %s", fn);
          idxfile.println(fn);
        } else {
          LOGD("Ignoring %s", fn);
        }
      }
      file = openNext(root);
    }
    popPath();
  }

On the other hand.
About reindex forced, I have tested it but at the end I have to remove index files to achieve that these one will be regenerated.

Any idea?

Thanks in advance.

    AudioSourceIdxSDMMC source(..);
    ...
    source.setCreateIndex(true);
    source.begin();