Migrate a repository to a mono repo

monofyRepo.sh

monofyRepo() {
  repository=$(basename $PWD)

  if [[ ! -d ".git" ]]; then
    echo "! $repository is not a git repository."
    return
  fi

  echo "» Monofying repository ($repository)...\n"

  echo "» Make sure all branches are merged into master"

  git checkout master > /dev/null 2>&1

  if [[ "$?" != "0" ]]; then
    echo "! Failed to checkout master"
    return
  fi

  while true; do
    echo "» Enter the new name of the subdirectory for this project:"
    printf "> "
    read newName
    if [[ "$newName" =~ ^[0-9a-zA-Z_-]+ ]]; then
      mkdir -p "$newName"
      break
    else
      echo "! The `$newName` must be a valid directory name.\n"
    fi
  done

  echo "» Moving all files into $newName/"
  ls -a1 | grep -v "^$newName" | xargs -I{} git mv {} "$newName"

  git commit -m "Moved repository into $newName/"

  echo "» Change directory to the monorepo and run:"
  echo "  git remote add $newName $PWD"
  echo "  git fetch $newName"
  echo "  git merge -m \"[Mono] Added $newName\" --allow-unrelated-histories $newName/master"
}