#!/bin/bash

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

mapfile -t files < <(find . -maxdepth 1 -type f -not -name 'desktop.ini')

for filename in "${files[@]}"; do
  filename_m5sum=$(md5sum "$filename" | awk '{print $1}')
  filename_extension="${filename##*.}"

  new_filename="$filename_m5sum.$filename_extension"

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

  mv "$filename" "$new_filename"
done