# Save dirstack history to .zdirs
  # adapted from:
  # github.com/grml/grml-etc-core/blob/master/etc/zsh/zshrc#L1547
  
  DIRSTACKSIZE=${DIRSTACKSIZE:-20}
  dirstack_file=${dirstack_file:-${HOME}/.zdirs}
  
  if [[ -f ${dirstack_file} ]] && [[ ${#dirstack[*]} -eq 0 ]] ; then
    dirstack=( ${(f)"$(< $dirstack_file)"} )
    # "cd -" won't work after login by just setting $OLDPWD, so
    [[ -d $dirstack[1] ]] && cd $dirstack[1] && cd $OLDPWD
  fi
  
  chpwd() {
    if (( $DIRSTACKSIZE <= 0 )) || [[ -z $dirstack_file ]]; then return; fi
    local -ax my_stack
    my_stack=( ${PWD} ${dirstack} )
    builtin print -l ${(u)my_stack} >! ${dirstack_file}
  }