Dynamic window title with zsh shell

.zshrc

# Dynamic window title with zsh shell.
# Shows current directory and running (multi-line) command.
case "$TERM" in (rxvt|rxvt-*|st|st-*|*xterm*|(dt|k|E)term)
    local term_title () { print -n "\e]0;${(j: :q)@}\a" }
    precmd () {
      local DIR="$(print -P '[%c]%#')"
      term_title "$DIR" "zsh"
    }
    preexec () {
      local DIR="$(print -P '[%c]%#')"
      local CMD="${(j:\n:)${(f)1}}"
      term_title "$DIR" "$CMD"
    }
  ;;
esac