github.com/kovansky/hugo@v0.92.3-0.20220224232819-63076e4ff19f/tpl/tplimpl/embedded/templates/shortcodes/gist.html

<script type="application/javascript" src="https://gist.github.com/{{ index .Params 0 }}/{{ index .Params 1 }}.js{{if len .Params | eq 3 }}?file={{ index .Params 2 }}{{end}}"></script>