#!/bin/bash

is_binary() {
  if [[ -z "$(file "$1" | grep text)" ]]; then
    return 0
  else
    return 1
  fi
}

binary_extensions=()

while IFS= read -r -d '' file; do
  [[ "$file" =~ 'git/index' ]] && continue

  if is_binary "$file"; then
    extension="${file##*.}"

    [[ ! ${binary_extensions[@]} =~ $extension ]] && binary_extensions+=("$extension")
  fi
done < <(find . -type f -print0)

echo "Binary extensions:"
for ext in ${binary_extensions[@]}; do
  echo "    *.$ext"
  # git lfs track "*.$binary_extensions" --lockable
done