Support per project knife.rb files?

[pikeas]

From https://github.com/zsh-users/zsh-completions/blob/master/src/_knife#L221-L223:

_chef_cookbooks_local() {
 (for i in $( grep cookbook_path $HOME/.chef/knife.rb | awk 'BEGIN {FS = "[" }; {print $2}' | sed 's/\,//g' | sed "s/'//g" | sed 's/\(.*\)]/\1/' ); do ls $i; done)
}

This checks for a master knife.rb in the user's home directory. Is there a way to have this completion work more like cd and complete cookbooks / roles / data bags / etc based on current working directory (or relative to first found .chef directory searching through parents)?