// ==UserScript==
// @name         Reddit Visited Link Hider
// @namespace    https://greasyfork.org/en/users/85671-jcunews
// @version      1.0.1
// @license      AGPL v3
// @description  Hide links on Reddit which are already have been visited.
// @author       jcunews
// @include      https://www.reddit.com/*
// @grant        none
// ==/UserScript==
(function() {
var i, eles, now = (new Date()).valueOf();
var visitedUrls = JSON.parse(localStorage.visitedUrls || "[]");
//each array element is an array which contains the timestamp then the URL
var visitedLinkExpiry = 7*24*60*1000; //7 days. in milliseconds
//visited link records which are equal or older than this will be removed
//check if link has been visited
function isLinkVisited(link) {
for (var i = visitedUrls.length-1; i >= 0; i--) {
if (visitedUrls[i][1] === link.href) {
return true;
}
}
return false;
}
//track link visit
addEventListener("click", function(ev) {
var link = ev.target, ele;
if ((ev.button === 0) && (link.tagName === "A")) {
ele = link.parentNode; //title P element
if (ele) {
ele = ele.parentNode; //entry DIV element
if (ele) {
ele = ele.parentNode; //thing DIV element
if (ele && ele.classList.contains("thing")) {
ev.preventDefault();
if (!isLinkVisited(link)) {
visitedUrls.push([(new Date()).valueOf(), link.href]);
localStorage.visitedUrls = JSON.stringify(visitedUrls);
ele.style.display = "none";
}
}
}
}
}
});
//remove any visited link records which are too old
for (i = visitedUrls.length-1; i >= 0; i--) {
if ((now-visitedUrls[i][0]) >= visitedLinkExpiry) {
visitedUrls.splice(i, 1);
}
}
localStorage.visitedUrls = JSON.stringify(visitedUrls);
//hide visited links when page has been loaded
eles = document.querySelectorAll(".thing.link > .entry > .title > .title");
for (i = eles.length-1; i >= 0; i--) {
if (isLinkVisited(eles[i])) {
eles[i].parentNode.parentNode.parentNode.style.display = "none";
}
}
})();