Warn on unpushed git changes

gistfile1.txt

export PS1="\u@\H \w \$(parse_git_branch)\$ "

function parse_git_branch {
  ref=$(git symbolic-ref HEAD 2> /dev/null) || return
  ref=${ref#refs/heads/}
  unpushed=$(git log origin/$ref..$ref 2> /dev/null) || return
  if [ "$unpushed" ]; then
      warn=' - UNPUSHED!'
  fi
  echo "("$ref$warn")"
}