Custom completion not working?

[sharpchen]

I had a custom command named as nsp and this completion customization for nsp is not working as expected, it still completes for files.

I am currently not familiar with bash, I appreciate any correction :)

nsp() {
    nix-store -q --outputs "$(type -fP "$1")"
}

_fzf_complete_nsp() {
    _fzf_complete -- "$@" < <(
        compgen -c
    )
}

[sharpchen]

It seems I have to register it

complete -F _fzf_complete_nsp nsp