kubectx/kubens multi context magic

kubectx.zsh

# BSD 2-Clause License

# Copyright (c) 2019, Stuart Warren
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# located at $ZSH_CUSTOM/kubectx.zsh 
# specify export KUBECONFIG="/some/file" before sourcing oh-my-zsh

export KUBECTXTTYCONFIG="${HOME}/.kube/tty/$(basename $(tty) 2>/dev/null || echo 'notty')"
mkdir -p "$(dirname $KUBECTXTTYCONFIG)"
export KUBECONFIG="${KUBECTXTTYCONFIG}:${KUBECONFIG}"
cat <<EOF >${KUBECTXTTYCONFIG}
apiVersion: v1
kind: Config
current-context: ""
EOF

ct() {
        kubectx $*
        kubectl --context="$(kubectl --kubeconfig $KUBECTXTTYCONFIG config current-context)" config view --raw --minify -o json | jq 'del(.users,.clusters)' >$KUBECTXTTYCONFIG
}

_fzf_complete_ct() {
        _fzf_complete "+m --ansi --no-preview" "$@" < <(
                KUBECTX_IGNORE_FZF=true kubectx
        )
}

alias ns="kubens"

_fzf_complete_ns() {
        _fzf_complete "+m --ansi --no-preview" "$@" < <(
                KUBECTX_IGNORE_FZF=true kubens
        )
}

Got an error like error: current-context is not set

[edit] see ahmetb/kubectx#12