Add nix runner to zshrc

dotfiles/zshrc

@@ -14,6 +14,12 @@ alias scheme='rlwrap mit-scheme'
 # This is for the mac GUI version of emacs.
 alias emacs-gui='open -a /Applications/Emacs.app $1'
 
+# This is for nix if it exists
+if [ -f ~/.nix-profile/etc/profile.d/nix.sh ]
+then
+  . ~/.nix-profile/etc/profile.d/nix.sh
+fi
+
 parse_git_branch() {
     git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
 }