Organize images into subfolders

make_folders.js

const fs = require('fs');
const path = require('path');

const MAX_FILES_PER_FOLDER = 500;
const IMAGE_EXTENSIONS = ['.png', '.jpg', '.jpeg', '.gif'];

// Get a list of all files in the current directory
const files = fs.readdirSync('.');

// Filter out only the image files
const image_files = files.filter(file => {
  const extension = path.extname(file).toLowerCase();
  return IMAGE_EXTENSIONS.includes(extension);
});

// Determine how many subfolders we need
const num_folders = Math.ceil(image_files.length / MAX_FILES_PER_FOLDER);

console.log(`Found ${image_files.length} image files.`);
console.log(`Creating ${num_folders} folders with a maximum of ${MAX_FILES_PER_FOLDER} files per folder.`);

// Create the subfolders and move the files into them
for (let i = 0; i < num_folders; i++) {
  const folder_name = `Folder ${i + 1}`;
  fs.mkdirSync(folder_name);
  
  const start_index = i * MAX_FILES_PER_FOLDER;
  const end_index = Math.min((i + 1) * MAX_FILES_PER_FOLDER, image_files.length);
  const files_to_move = image_files.slice(start_index, end_index);
  
  console.log(`Moving ${files_to_move.length} files to ${folder_name}.`);
  
  files_to_move.forEach(file => {
    const old_path = path.join('.', file);
    const extension = path.extname(file).toLowerCase();
    let new_path = path.join(folder_name, file);
    if (extension !== path.extname(new_path).toLowerCase()) {
      new_path += extension;
    }
    fs.renameSync(old_path, new_path);
  });
}

console.log('Done.');

remove_folders.js

const fs = require('fs');
const path = require('path');

const ORIGINAL_FOLDER_NAME = 'Original Files';

// Get a list of all subfolders
const subfolders = fs.readdirSync('.')
  .filter(file => fs.lstatSync(file).isDirectory());

// Find the folder that contains the original files
const original_folder = subfolders.find(folder => folder.toLowerCase() === ORIGINAL_FOLDER_NAME.toLowerCase());

if (!original_folder) {
  console.error(`Could not find folder "${ORIGINAL_FOLDER_NAME}".`);
  process.exit(1);
}

// Get a list of all files in the subfolders
const subfolder_files = subfolders.map(folder => {
  return {
    folder_name: folder,
    files: fs.readdirSync(folder)
  };
});

// Create the original folder if it doesn't already exist
if (!fs.existsSync(ORIGINAL_FOLDER_NAME)) {
  fs.mkdirSync(ORIGINAL_FOLDER_NAME);
}

// Move all files back into the original folder
subfolder_files.forEach(({ folder_name, files }) => {
  console.log(`Moving ${files.length} files from ${folder_name} to ${ORIGINAL_FOLDER_NAME}.`);
  files.forEach(file => {
    const old_path = path.join(folder_name, file);
    const new_path = path.join(ORIGINAL_FOLDER_NAME, file);
    fs.renameSync(old_path, new_path);
  });
});

// Delete all empty subfolders
subfolders.forEach(folder => {
  if (fs.readdirSync(folder).length === 0) {
    console.log(`Deleting empty folder: ${folder}`);
    fs.rmdirSync(folder);
  }
});

console.log('Done.');