This is the normal gentoo bash prompt for zsh. The file goes to /usr/share/zsh/*zsh version*/functions/Prompts
Created attachment 26863 [details] zsh gentoo prompt
(I hope it's ok to reassign this to the person who seems to be responible for zsh at the moment =) )
hi. I intended to include it with zsh-4.2.0_pre3.ebuild, but pYrania committed it without your pretty prompt ;) (I don't have much time until next weekend, anyhow) I'll add it in the next prerelease, together with cap local IUSE flag.
I've just added it with zsh-4.2.0_pre4.ebuild. Thanks for the contribution.