Hacker News Story Rank Change Indicator

Show how much stories are going up and down in the list
当前为 2024-02-12 提交的版本，查看最新版本。
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// ==UserScript==
// @name         Hacker News Story Rank Change Indicator
// @namespace    http://tampermonkey.net/
// @version      2024-02-10_16-14
// @description  Show how much stories are going up and down in the list
// @author       SMUsamaShah
// @match        https://news.ycombinator.com/
// @match        https://news.ycombinator.com/news
// @match        https://news.ycombinator.com/news?p=*
// @match        https://news.ycombinator.com/?p=*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=ycombinator.com
// @grant        none
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    var KEY_LAST_CLEAR = 'hackernews-rank-notifier-clear-time';
    var KEY_RANK_STORE = 'hackernews-rank-notifier';
    var MAX_STORIES = 3000;

    var oldRanks = JSON.parse(localStorage.getItem(KEY_RANK_STORE)) || {};

    var stories = Array.from(document.getElementsByClassName('athing'));

    stories.forEach(function(story) {
        var id = story.id;
        var rank = story.querySelector('span.rank').innerText;
        rank = parseInt(rank.slice(0, -1)); // removing the dot at the end
        var title = story.querySelector('.title a');

        if (id in oldRanks) {
            var change = oldRanks[id] - rank;
            if (change !== 0) {
                // the story has moved
                title.textContent = '(' + (change > 0 ? '+' : '-') + Math.abs(change) + ') ' + title.textContent;
            }
        } else {
            // the story is new
            title.textContent = '(NEW) ' + title.textContent;
        }
        // update the rank in memory
        oldRanks[id] = rank;
    });

    // Get the top 3000 story ids
    var topStoryIds = Object.keys(oldRanks).sort((a, b) => b - a).slice(0, MAX_STORIES);

    // Create a new object with only the top 3000 latest story rankings
    var newRanks = {};
    topStoryIds.forEach(id => {
        newRanks[id] = oldRanks[id];
    });

    localStorage.setItem(KEY_RANK_STORE, JSON.stringify(oldRanks));
})();