How to pin information to the top of a terminal window on Mac OSX

Question

I've seen demos where folks have had a Mac OSX terminal where the current time + username + directory are afixed (like 'freeze rows' in excel) to the top of the terminal window (not in the title bar), offering all the friendly context info I need while leaving lots of room for the command prompt after a simple '$'.

How do I tweak my Terminal to look like that?

PS. If it matters, I have recently started using an alternative shell called fish: http://fishshell.com/ but I'm happy with any answer for any shell.

EDIT: I went off to find the demo which first placed this idea in my head and I actually FOUND IT: https://www.youtube.com/watch?v=zBt2g9ekiug#t=55

Answer 1

Edit 2:

Add these lines to your ~/.zshrc:

case $TERM in
  xterm*)
    precmd () {print -Pn "e]0;%~a"}
    ;;
esac

This is the result:

If you are using bash:

case $TERM in
  xterm*)
    PS1="[e]0;wa]\$ "
    PROMPT_COMMAND='echo -ne "${USER}@${HOSTNAME}:${PWD/#$HOME/~}"'
    ;;
esac

Have a look at this link. I think you'll enjoy it :)

Edit: another good link