Question

I know that I can exec a date command in my zsh prompt. However, it shows the old time; to see the current time, I have to hit <return> and get a new prompt with the current time.

Is there a way to configure the zsh prompt to constantly update itself every second?

Answer 1

This would be .... unpleasant in a standard zsh prompt (or bash, or other shells).

I suggest you d be better off using Gnu Screen.

Screen can have a status line which can show the time. Here s an example screenrc scroll down to "Red Hat Magazine A guide to GNU Screen" to see the sample (i ll reproduce that here) which will, when screen is run, show the current time in the lower right corner of the terminal:

~/.screenrc

hardstatus alwayslastline
hardstatus string  %{= kG}[ %{G}%H %{g}][%= %{=kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B}%Y-%m-%d %{W}%c %{g}] 

# Default screens
screen -t shell1        0
screen -t shell2        1

http://www.gnu.org/software/screen/

Answer 2

Note: I wrote this answer for a similar question, but seeing how this question has more views I think reposting my answer here would be useful.

This is in fact possible without resorting to strange hacks. I ve got this in my .zshrc

RPROMPT= [%D{%L:%M:%S %p}] 

TMOUT=1

TRAPALRM() {
    zle reset-prompt
}

The TRAPALRM function gets called every TMOUT seconds (in this case 1), and here it performs a prompt refresh, and does so until a command starts execution (and it doesn t interfere with anything you type on the prompt before hitting enter).

Source: http://www.zsh.org/mla/users/2007/msg00944.html (It s from 2007!)

Answer 3

Sounds like a pleasant request to me. If anything it makes more sense than showing the time when the prompt was displayed.

Fortunately Peter Stephenson posted a technique. Try something like this in .zshrc:

PROMPT="[%T] %n@%M %~ %# "

schedprompt() {
  emulate -L zsh
  zmodload -i zsh/sched

  # Remove existing event, so that multiple calls to
  # "schedprompt" work OK.  (You could put one in precmd to push
  # the timer 30 seconds into the future, for example.)
  integer i=${"${(@)zsh_scheduled_events#*:*:}"[(I)schedprompt]}
  (( i )) && sched -$i

  # Test that zle is running before calling the widget (recommended
  # to avoid error messages).
  # Otherwise it updates on entry to zle, so there s no loss.
  zle && zle reset-prompt

  # This ensures we re not too far off the start of the minute
  sched +30 schedprompt
}

schedprompt

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