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

{{ if len .Params | eq 2 }}{{ highlight (trim .Inner "\n\r") (.Get 0) (.Get 1) }}{{ else }}{{ highlight (trim .Inner "\n\r") (.Get 0) "" }}{{ end }}