On topic pages, show "X unread comments (Y total)"; on comment pages, highlight unread comments. Local storage only -- does not work across multiple computers.
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// ==UserScript==
// @name Reddit - Unread Comment Helper (fork)
// @description On topic pages, show "X unread comments (Y total)"; on comment pages, highlight unread comments. Local storage only -- does not work across multiple computers.
// @author Sam Angove <sam a-inna-circle rephrase period network>
// @namespace http://rephrase.net/box/user-js/
// @include http://reddit.com/
// @include http://reddit.com/?*
// @include http://reddit.com/r/*
// @include http://www.reddit.com/
// @include http://www.reddit.com/*
// @include http://www.reddit.com/r/*
// @version f.5.3
// ==/UserScript==
/*
Features:
* Replaces "10 comments" with "5 unread comments (10 total)"
* The unread comments link goes directly to the first unread comment
* Unread comments are highlighted for ease of skimming
* You can navigate through unread comments with the following hotkeys:
Alt+Q / Alt+W -or- Ctrl+Up arrow / Ctrl+Down arrow
Version history:
0.1.0 - 2007-06-18 - initial release
0.2.0 - 2008-05-27 - revise to work with new Reddit, and finally remove
the (long superfluous) cross-subdomain messaging crap
0.2.1 - 2008-07-23 - update to work with new URL form
0.2.2 - 2009-02-03 - update to work with new HTML
0.2.3 - 2009-06-03 - update to handle additional classnames with "entry"
0.2.4 - 2009-06-03 - fix "jump to new comment"
0.3.0 - 2010-02-19 - rewrite to use localStorage instead of Google Gears;
exclude comscore iframe
0.3.1 - 2010-02-24 - don't @exclude valid links with 'help' etc. in title,
version stored data, use non-b36 separator
f.4.0 - 2013-10-03 - fix bugs with incorrect unread count, allow to
navigate through unread comments
f.5.0 - 2013-10-27 - delete items older than 7 days to avoid the
localStorage size quota
f.5.1 - 2013-11-06 - fixed a bug in deletion date calculation
f.5.2 - 2014-03-21 - fixed a breakage due to an update of Reddit
*/
(function(){
var DATA_VERSION = 'ruch2';
var DELETE_OLDER_THAN = 1000*60*60*24*7; // Items older than 7 days
/* Shove an item into local storage */
function getData(id) {
var data = localStorage.getItem(DATA_VERSION + '|' + id);
//console.log("getData", document.location.href, id, data);
if (data === null || data.substr(0, 1) != "{")
return null;
return JSON.parse(data);
}
/* Get an item out of local storage */
function setData(id, data) {
//console.log("setData", document.location.href, id, data);
localStorage.setItem(DATA_VERSION + '|' + id, JSON.stringify(data));
}
/* Delete old items out of local storage */
function deleteOldItems() {
var data = localStorage.getItem(DATA_VERSION + '_last_clean_time');
if (data !== null && Date.now() - data < 1000*60*60*24) { // Cleanup every 24 hours
return;
}
var key, row;
for (var i = 0; i < localStorage.length; i++) {
//console.log(localStorage.key(i));
key = localStorage.key(i);
if (key.lastIndexOf(DATA_VERSION + '|', 0) !== 0) {
continue;
}
data = localStorage.getItem(key);
if (data === null || data.substr(0, 1) != "{") {
continue;
}
row = JSON.parse(data);
if (Date.now() - row["seentime"] < DELETE_OLDER_THAN) {
continue;
}
localStorage.removeItem(key);
}
localStorage.setItem(DATA_VERSION + '_last_clean_time', Date.now());
}
/* Apply a style to highlight unread comments */
function highlightUnread(comment) {
comment.style.setProperty("border-left", "2px solid orange", null);
comment.style.setProperty("padding-left", "5px", null);
comment.classList.add('unreadHighlighted');
}
/* Get sorted array of unread comments offsets. */
function getCommentsOffsetTop() {
var comments = document.getElementsByClassName('unreadHighlighted');
var arr = new Array(comments.length);
for (var i = 0; i < comments.length; i++) {
arr[i] = comments[i].offsetTop;
}
arr.sort(function(a, b) {
return a - b;
});
return arr;
}
/* Jump to the next new comment. */
function jumpToNextComment() {
var unread = getCommentsOffsetTop();
var scrollUnread;
for (var i = 0; i < unread.length; i++) {
scrollUnread = unread[i] - Math.round(window.innerHeight/2);
if (scrollUnread > document.documentElement.scrollTop) {
window.scrollTo(0, scrollUnread);
break;
}
}
}
/* Jump to the previous new comment. */
function jumpToPrevComment() {
var unread = getCommentsOffsetTop().reverse();
var scrollUnread;
for (var i = 0; i < unread.length; i++) {
scrollUnread = unread[i] - Math.round(window.innerHeight/2);
if (scrollUnread < document.documentElement.scrollTop) {
window.scrollTo(0, scrollUnread);
break;
}
}
}
/*
Handle a list page, adding "n unread comments" links etc.
*/
function handleListPage() {
var snap = document.evaluate("//a" +
"[contains(concat(' ', normalize-space(@class), ' '), ' comments ')]" +
"[contains(@href, '/comments')]",
document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
var b36tid, row, match, comments, seen, newcomments, newlink;
for(var elm = null, i = 0; (elm = snap.snapshotItem(i)); i++) {
match = elm.firstChild.nodeValue.match(/(\d+) comment/);
// No comments; bail early.
if (!match)
continue;
comments = match[1];
// Alphanumeric base-36 id, like "1lp5".
b36tid = elm.getAttribute("href").match(/\/comments\/([^\/]+)/)[1];
row = getData(b36tid);
seen = row ? row["seencount"] : 0;
newcomments = comments - seen;
// Can be negative if comments are deleted.
if (newcomments < 0) newcomments = 0;
newlink = elm.cloneNode(false);
if (newcomments > 0)
newlink.style.color = "#333";
var cstring = "unread comment" + (newcomments != 1 ? "s" : "");
newlink.appendChild( document.createTextNode(newcomments + " " + cstring) );
elm.parentNode.insertBefore(newlink, elm);
// Some comments have been read already.
// Show both read and unread counts.
if (comments > newcomments) {
// Magic fragment causes a jump to the first unread comment.
newlink.href += "#new";
elm.removeChild(elm.firstChild);
elm.appendChild(document.createTextNode("(" + comments + " total)"));
elm.style.setProperty("background-color", "#fff", null);
} else {
// All comments are unread.
elm.parentNode.removeChild(elm);
}
}
}
/*
Handle a comments page: highlight new comments, save the ID of the highest
comment, etc.
*/
function handleCommentsPage() {
var url = document.location.href.split("#");
var frag = url.length > 1 ? url[1] : false;
var b36tid = url[0].match(/\/comments\/([^\/]+)/)[1];
var row = getData(b36tid);
var update, max_cid = 0, newmax = 0, seencount = 0;
if (row) {
newmax = max_cid = row["max_cid"];
seencount = row["seencount"];
}
var comments, i, split, b36cid, cid;
comments = document.getElementsByClassName('comment');
for(i=0; i<comments.length; i++) {
split = comments[i].className.split("_");
if(split.length == 2)
{
b36cid = split[1].split(' ')[0].substr(1);
cid = parseInt(b36cid, 36);
if (cid > max_cid) {
highlightUnread(comments[i].getElementsByClassName("entry")[0]);
if (cid > newmax) {
newmax = cid;
}
}
}
}
if (frag == "new") {
jumpToNextComment();
}
var elm = document.getElementsByClassName('comments')[0];
comments = elm.innerHTML.match(/\b\d+\b/);
if (comments) {
comments = comments[0];
if (comments > 0) {
setData(b36tid, {"max_cid": newmax, "seencount": comments, "seentime": Date.now()});
}
}
}
if (document.location.href.match(/\/comments(\/|\?|#|$)/)) {
if (document.location.href.match(/\/comments\/[^\/?#]+(\/([^\/?#]+\/?)?)?(\?|#|$)/)) {
deleteOldItems();
handleCommentsPage();
document.addEventListener('keydown', function(e) {
// Alt+Q
if (e.keyCode == "Q".charCodeAt(0) && !e.shiftKey && !e.ctrlKey && e.altKey && !e.metaKey) {
jumpToPrevComment();
e.preventDefault();
return false;
}
// Alt+W
if (e.keyCode == "W".charCodeAt(0) && !e.shiftKey && !e.ctrlKey && e.altKey && !e.metaKey) {
jumpToNextComment();
e.preventDefault();
return false;
}
// Ctrl+up
if (e.keyCode == 38 && !e.shiftKey && e.ctrlKey && !e.altKey && !e.metaKey) {
jumpToPrevComment();
e.preventDefault();
return false;
}
// Ctrl+down
if (e.keyCode == 40 && !e.shiftKey && e.ctrlKey && !e.altKey && !e.metaKey) {
jumpToNextComment();
e.preventDefault();
return false;
}
}, false);
}
} else {
handleListPage();
}
})();