zsh: make vcs info in prompt async Roughly cribbed from [0], but I'm hoping to rework this soon to use the zsh async library that shouldn't require a tempfile. 0: http://www.anishathalye.com/2015/02/07/an-asynchronous-shell-prompt/

#!/bin/sh
if [ "`uname`" = "Darwin" ] ; then
    open -a emacs "$@"
else
    emacs -nw "$@"
fi