I tried to generate the nix expression for Hugo without success. I ran

nix-env -p go git go2nix
mkdir hugobuild
cd hugobuild
export GOPATH=`pwd`
go get -v github.com/gohugoio/hugo
cd src/github.com/gohugoio/hugo
go2nix save

However, I dont't think that all of the dependencies are listed in deps.nix. It seems like the dependencies might be stored in vendor/vendor.json, but I'm not familiar with go at all. How do I generate the nix expressions for Hugo?