This adds forward and backwards links to each day's page.
// ==UserScript==
// @name Advent of Code Day Navigation Links
// @namespace Violentmonkey Scripts
// @match https://adventofcode.com/*/day/*
// @grant none
// @version 1.0
// @author -
// @description This adds forward and backwards links to each day's page.
// ==/UserScript==
/**
* Return the url of the requested day.
* If less than 1 or greater than 25 provide a url to the overview page.
* @param {number} day
* @returns {string} A url to the requested day
*/
function makeURL(day) {
if (day < 1 || day > 25) {
return window.location.href.replace(/\/day\/.*/, '');
}
return window.location.href.replace(/(?<=\/day\/).*/, day);
}
/**
* Create an anchor tag.
* @param {number} day
* @param {string} text
* @returns {HTMLAnchorElement}
*/
function makeAnchor(day, text) {
const anchor = document.createElement('a');
anchor.href = makeURL(day);
anchor.textContent = text;
return anchor
}
/**
* Find the title, extract the day number, replace the `---` with links.
*/
function addNavigationLinks() {
const title = document.querySelector('article.day-desc > h2');
const currentDay = parseInt(title.textContent.match(/(?<=Day )[0-9]+(?=:)/)[0]);
title.textContent = title.textContent.match(/^--- (.*?) ---$/)[1];
title.prepend(makeAnchor(currentDay - 1, '<-- '));
title.append(makeAnchor(currentDay + 1, ' -->'));
}
addNavigationLinks();