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Add Link To Remove Old/Crowded Reddit Posts

Add a link on Reddit tab bar to remove posts on front page or subreddit in N number of pages which are older than N hours or has more than N number of comments.

  1. // ==UserScript==
  2. // @name        Add Link To Remove Old/Crowded Reddit Posts
  3. // @namespace   AddLinkToRemoveOldCrowdedRedditPosts
  4. // @description Add a link on Reddit tab bar to remove posts on front page or subreddit in N number of pages which are older than N hours or has more than N number of comments.
  5. // @include     https://www.reddit.com/*
  6. // @version     1.1.1
  7. // @author      jcunews
  8. // @grant       none
  9. // ==/UserScript==
  10.  
  11.  
  12. //increase this wait time if subsequent page processing didn't work.
  13. //for proper use, after the page has been loaded, the link won't show after before period.
  14. //i.e. when network is slow
  15. var networkWaitTime = 500; //time in milliseconds
  16.  
  17.  
  18. setTimeout(function() {
  19.   if (!document.querySelector(".content > .spacer > .sitetable .hide-button")) return;
  20.   var ele = document.createElement("SCRIPT");
  21.   ele.innerHTML = "(" + (function() {
  22.  
  23.     //*** settings start ***
  24.     var maxAge      = 17; //in hours
  25.     var maxComments = 1000;
  26.     var maxNumPages = 2;
  27.     //*** settings end ***
  28.  
  29.     //initialize variables
  30.     var config = JSON.parse(sessionStorage.removeOldCrowdedPosts || "{}"), index = -1;
  31.     var postsToHide, link, indicatorCurtain, indicatorMessagePanel;
  32.     config.pageCount = config.pageCount || 0;
  33.     //prepare posts removal indicator message
  34.     indicatorCurtain = document.createElement("DIV");
  35.     indicatorCurtain.style.cssText = "position: fixed; z-index: 99; left: 0; top: 0; right: 0; bottom: 0; opacity: 0.66; background: black";
  36.     indicatorMessagePanel = document.createElement("DIV");
  37.     indicatorMessagePanel.style.cssText = "position: fixed; z-index: 100; left: 30%; top: 40%; right: 30%; background: red; color: white; text-align: center; line-height: 3em; font-size: 20pt; font-weight: bold";
  38.     indicatorMessagePanel.textContent = "Hiding posts...";
  39.  
  40.     //add the link if not already added
  41.     function addLink() {
  42.       var tabmenu = document.querySelector("#header-bottom-left .tabmenu");
  43.       if (!tabmenu || link) return;
  44.       link = document.createElement("A");
  45.       link.textContent = "Remove Old/Crowded";
  46.       link.style.marginLeft = "3ex"
  47.       link.href = "javascript:void(0)";
  48.       link.onclick = startRemovePosts;
  49.       tabmenu.appendChild(link);
  50.     }
  51.  
  52.     //check whether to process next page or not
  53.     function checkForNextPage() {
  54.       config.pageCount--;
  55.       sessionStorage.removeOldCrowdedPosts = JSON.stringify(config);
  56.       if (config.pageCount) {
  57.         //there are more pages to process. click the next-page link
  58.         var link = document.querySelector(".sitetable .next-button a");
  59.         if (link) {
  60.           link.click();
  61.         }
  62.       } else {
  63.         //no more page to process. add the link
  64.         addLink();
  65.         document.body.removeChild(indicatorMessagePanel);
  66.         document.body.removeChild(indicatorCurtain);
  67.       }
  68.     }
  69.  
  70.     //remove the posts
  71.     function removePosts() {
  72.       var posts = document.querySelectorAll(".content > .spacer > .sitetable > .thing");
  73.       var time = (new Date()).valueOf(), maxAgeMs = maxAge*3600000;
  74.       var i, postTime, comments, link;
  75.  
  76.       //add matching posts in current page into hide-list
  77.       postsToHide = [];
  78.       for (i = posts.length-1; i >= 0; i--) {
  79.         //get post's time
  80.         postTime = parseInt(posts[i].getAttribute("data-timestamp"));
  81.         //get post's number of comments
  82.         comments = parseInt(posts[i].querySelector(".comments").textContent.match(/\d+/)[0]);
  83.         //main decision
  84.         if (((time-postTime) > maxAgeMs) || (comments > maxComments)) {
  85.           //add post's hide link into hide-list
  86.           link = posts[i].querySelector(".hide-button a");
  87.           if (link) {
  88.             postsToHide.push(link);
  89.           }
  90.         }
  91.       }
  92.       if (postsToHide.length) {
  93.         //has post(s) to hide. show posts removal indicator message
  94.         document.body.appendChild(indicatorCurtain);
  95.         document.body.appendChild(indicatorMessagePanel);
  96.         //hide the first post in the hide-list
  97.         postsToHide.splice(0, 1)[0].click();
  98.       } else {
  99.         //no post to hide. check for next page
  100.         checkForNextPage();
  101.       }
  102.     }
  103.  
  104.     //start removing posts
  105.     function startRemovePosts() {
  106.       if (!navigator.onLine) {
  107.         alert("Web browser is offline.");
  108.         return;
  109.       }
  110.       config.pageCount = maxNumPages;
  111.       sessionStorage.removeOldCrowdedPosts = JSON.stringify(config);
  112.       removePosts();
  113.     }
  114.  
  115.     //setup network-post callback
  116.     window._change_state = window.change_state;
  117.     window.change_state = function(e, t, n, i, s) {
  118.       var _s = s, link;
  119.       if ((t === "hide") && (n === window.hide_thing)) {
  120.         s = function() {
  121.           if (postsToHide.length) {
  122.             //has more post(s) to hide. hide the next one in the hide-list
  123.             postsToHide.splice(0, 1)[0].click();
  124.           } else {
  125.             //all hide network requests has completed. check for next page
  126.             checkForNextPage();
  127.           }
  128.           if (_s) {
  129.             return _s.apply(this, arguments);
  130.           }
  131.         };
  132.       }
  133.       return window._change_state(e, t, n, i, s);
  134.     };
  135.  
  136.     //check whether posts removal is in effect
  137.     if (config.pageCount) {
  138.       //posts removal is in effect. process it
  139.       removePosts();
  140.     } else {
  141.       //posts removal is not in effect, or no more pages to process. add the link
  142.       addLink();
  143.     }
  144.  
  145.   }).toString() + ")()";
  146.   document.head.appendChild(ele);
  147. }, networkWaitTime);