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Ctrl-z suspends the foreground process, but when there is nothing in the foreground it has no effect. I want to overload ctrl-z so when there is nothing in the foreground it brings the most recently suspended process back. This way, hitting ctrl-z toggles the foreground process. How would you do this?

BTW, I use zsh, but anything that works in bash should work too. I'm in terminal on OS X

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up vote 3 down vote accepted
ctrlz () {
  if [[ $#BUFFER -eq 0 ]]; then
    zle redisplay
    zle push-input
zle -N ctrlz
bindkey '^Z' ctrlz
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