Original _showLink

override def qlApply(invInit:Invocation):QValue = {
  invInit.ifMatches(sig) { inv =>
    inv.contextAs[URLableType] { pt =>
      inv.context.collect(ParsedTextType) { elemContext =>
        val wikitextOpt = for (
          elemV <- elemContext.value.firstOpt;
          url <- pt.getURL(elemContext)(elemV);
          label = inv.oldProcessParam(0, elemContext).wikify(elemContext)
        )
          yield QWikitext("[") + label + QWikitext(s"]($url)")
	              
        wikitextOpt match {
          case Some(wikitext) => QValue.make(ExactlyOne, ParsedTextType, wikitext)
          case None => Core.emptyListOf(ParsedTextType)
        }	          
      }
    }
  }
}