function title {
      if [[ $TERM == "screen" ]]; then
        # Use these two for GNU Screen:
        print -nR $' 33k'$1$' 33'
        print -nR $' 33]0;'$2$''
      elif [[ $TERM == "xterm" || $TERM == "rxvt" ]]; then
        # Use this one instead for XTerms:
        print -nR $' 33]0;'$*$''
      fi
}
function precmd { title zsh "$PWD" }
function preexec {
    emulate -L zsh
    local -a cmd; cmd=(${(z)1})
    title $cmd[1]:t "$cmd[2,-1]"
}