Add one-off script for adding hrothgar/viera headwear compatibility data

lib/util/template-parameters.js

@@ -49,3 +49,18 @@ export function addParameterBesideExistingParameter (pageContent, newParamName,
 	}
 	return null;
 }
+
+/** RegExp that matches the last parameter in an infobox. */
+const existingLastParameterRegExp = /^( *)\|( *)([a-z0-9-_]+)( *)=( *)(.*)(\n *}})$/m;
+
+/** Inserts a new parameter at the end of the infobox. */
+export function addParameterAtBottom (pageContent, newParamName, value) {
+	if (pageContent.match(existingLastParameterRegExp)) {
+		// has science gone too far?
+		return pageContent.replace(
+			existingLastParameterRegExp,
+			`$1|$2$3$4=$5$6\n$1|$2${newParamName}$4=$5${value}$7`,
+		);
+	}
+	return null;
+}