fs-utils.h

// #include <iostream>
#include <Arduino.h>
#include <LittleFS.h>


void listDir(fs::FS &fs, const char *dirname, uint8_t levels)
{
  Serial.printf("Listing directory: %s\r\n", dirname);

  File root = fs.open(dirname);
  if (!root)
  {
    Serial.println("- failed to open directory");
    return;
  }
  if (!root.isDirectory())
  {
    Serial.println(" - not a directory");
    return;
  }

  File file = root.openNextFile();
  while (file)
  {
    if (file.isDirectory())
    {
      Serial.print("  DIR : ");

      Serial.print(file.name());
      time_t t = file.getLastWrite();
      struct tm *tmstruct = localtime(&t);
      Serial.printf("  LAST WRITE: %d-%02d-%02d %02d:%02d:%02d\n", (tmstruct->tm_year) + 1900, (tmstruct->tm_mon) + 1, tmstruct->tm_mday, tmstruct->tm_hour, tmstruct->tm_min, tmstruct->tm_sec);

      if (levels)
      {
        listDir(fs, file.name(), levels - 1);
      }
    }
    else
    {
      Serial.print("  FILE: ");
      Serial.print(file.name());
      Serial.print("  SIZE: ");

      Serial.print(file.size());
      time_t t = file.getLastWrite();
      struct tm *tmstruct = localtime(&t);
      Serial.printf("  LAST WRITE: %d-%02d-%02d %02d:%02d:%02d\n", (tmstruct->tm_year) + 1900, (tmstruct->tm_mon) + 1, tmstruct->tm_mday, tmstruct->tm_hour, tmstruct->tm_min, tmstruct->tm_sec);
    }
    file = root.openNextFile();
  }
}