reddit-compact-links.user.js

// ==UserScript==
// @name         Reddit Compact links
// @version      0.1
// @description  Adds useful links to threads
// @author       turboevoluzione
// @match        *://*.reddit.com/*
// @exclude      *://old.reddit.com/*
// @grant        none
// ==/UserScript==

/*
 * Modifies the page.
 */
function modifyPage() {
    var loc = document.location;

    // Check the current URL and the link's domain.
    if (testUrl(loc)) {
        createLink('link-top', 'top', getTopUrl(loc));
        createLink('link-new', 'new', getNewUrl(loc));
        createLink('link-stream', 'str', getStreamUrl(loc));

        if (testDomain())
            createLink('link-video', 'vid', getVideoUrl(loc));
    }
}

/*
 * Checks whether the URL matches a thread on Reddit's compact website.
 */
function testUrl(location) {
    var url = new URL(location);

    var isCompact = url.pathname.endsWith('/.i');
    var isThread = !!(url.pathname.indexOf('/comments/') > -1
        && url.pathname.indexOf('/user/') == -1
        && url.pathname.indexOf('/u/') == -1);

    return isCompact && isThread;
}

/*
 * Checks whether the link's domain matches a Reddit video.
 */
function testDomain() {
    var domain = document.getElementsByClassName('domain')[0];

    if (domain != undefined) {
        var text = domain.childNodes[1].textContent;

        if (text == 'v.redd.it')
            return true;
    }

    return false;
}

/*
 * Gets the top URL.
 */
function getTopUrl(location) {
    var url = new URL(location);

    // Sort the thread's comments by number of upvotes.
    url.searchParams.set('sort', 'top');

    return url;
}

/*
 * Gets the new URL.
 */
function getNewUrl(location) {
    var url = new URL(location);

    // Sort the thread's comments by newest.
    url.searchParams.set('sort', 'new');

    return url;
}


/*
 * Gets the stream URL.
 */
function getStreamUrl(location) {
    var url = new URL(location);

    // Switch URL from compact Reddit to Reddit Stream.
    url.hostname = 'reddit-stream.com';

    return url;
}

/*
 * Gets the video URL.
 */
function getVideoUrl(location) {
    var url = new URL(location);

    // Switch URL from compact Reddit to old Reddit.
    url.hostname = 'old.reddit.com';
    url.pathname = url.pathname.replace('/.i', '/');

    return url;
}

/*
 * Creates a link.
 */
function createLink(nodeId, textContent, url) {
    var tabmenu = document.getElementsByClassName('tabmenu')[0];

    if (tabmenu != undefined) {
        var oldNode = document.getElementById(nodeId);
        if (oldNode != undefined)
            oldNode.parentNode.removeChild(oldNode);

        // Create the link.
        var nodeLink = document.createElement('a');
        nodeLink.setAttribute('href', url.href);
        nodeLink.setAttribute('class', 'choice');
        nodeLink.textContent = textContent;

        // Create the link's container.
        var newNode = document.createElement('li');
        newNode.setAttribute('id', nodeId);
        newNode.appendChild(nodeLink);

        tabmenu.appendChild(newNode);
    }
}

window.onload = modifyPage;