#!/bin/bash

if [ "$(pwd)" == "$HOME" ]; then
  echo "Current directory should not be HOME"
  exit 1
fi

mapfile -t files < <(find . -type f -not -name 'urls.txt' -not -name 'desktop.ini')

for filepath in "${files[@]}"; do
  filename=$(basename "$filepath")
  filename_dir=$(dirname "$filepath")

  filename_md5sum=$(md5sum "$filepath" | awk '{print $1}')
  filename_extension="${filename##*.}"

  new_filename="$filename_md5sum.$filename_extension"

  if [ "$filename" == "$new_filename" ]; then
    continue
  fi

  mv "$filepath" "$filename_dir/$new_filename"
done