+if [ "${PS1:-}" = '%m%# ' ]; then
+ local _MIDDLE="%1v%(2v.|%B%2v%b|.)%(3v.%3v.)"
+ if is_root; then
+ _MIDDLE="%25<…<%~%<<"
+ local _PS1_HL=U
+ fi
+
+ local _MACHINE_NAME="${_PS1_HL:=B}%m%${(L)_PS1_HL}"
+ _MACHINE_NAME="$_MACHINE_NAME${debian_chroot:+/%S$debian_chroot%s}"
+
+ PS1="%(2L.+.)%${_MACHINE_NAME}:${_MIDDLE}%# "