git-rebase-preserve-author() {
  git rebase --preserve-merges $1

  root_dir=(git rev-parse --show-toplevel)
  while [[ -f ${root_dir}/.git/rebase-merge/stopped-sha ]]; do
    stopped_sha=(cat ${root_dir}/.git/rebase-merge/stopped-sha)
    git_author_string=(git show -s --format='%an <%ae>' ${stopped_sha})

    for c in (git diff --name-only --diff-filter=U); do
      eval ${EDITOR} ${root_dir}/$c
    done

    git commit --all--author=${git_author_string}
    git rebase --continue
  done
}