zsh to fetch a remote fork as a a branch

gistfile1.sh

# todo, this substitution only works with zsh, and passing shell functions doesn't seem to work with parallel

# usage gfr https://github.com/user/fork.git
gfr() {  git remote add ${${1%/*}##*/} $1;  git fetch ${${1%/*}##*/} master:${${1%/*}##*/}; }
export -f gfr
function curl -v -H "Authorization: token ${GITHUBAPIKEY}" https://api.github.com/repos/${GITUSER}/${GITREPO}/forks |
    jq '.[].clone_url' |
    sed "s/\"//g" |
    parallel -j 1 ./gfr :::