# Render `pug_string` with the command cli `pug` and use data from `json`
	#
	# See https://pugjs.org/api/getting-started.html for more details on pug.
	fun pug(pug_string: nullable String, json: nullable Serializable, status: nullable Int) do
		var process
		if json == null then
			process = new ProcessDuplex("pug", "-D")
		else
			process = new ProcessDuplex("pug", "-D", "-O", json.to_json)
		end
		var out = process.write_and_read(pug_string or else "")
		process.close
		html(out, status)
	end