if [ -n "$__CURRENT_GIT_BRANCH" ]; then
  local s=":"
  s+="$__CURRENT_GIT_BRANCH"

  case "$__CURRENT_GIT_BRANCH_STATUS" in
    ahead)
      s+="↑"
      ;;
    diverged)
      s+="↕"
      ;;
    behind)
      s+="↓"
      ;;
  esac

  if [ -n "$__CURRENT_GIT_BRANCH_IS_DIRTY" ]; then
    s+="⚡"
  fi

  echo $s
fi