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Better Reddit Image Previews

Fixes issues with reddit image previews. Specifically, clicking image preview now links directly to image (instead of thread) and fits height of image previews in carousel so they don't get clipped out.

2022-03-05 या दिनांकाला. सर्वात नवीन आवृत्ती पाहा.

// ==UserScript==
// @name         Better Reddit Image Previews
// @namespace    https://lawrenzo.com/p/better-reddit-image-previews
// @version      0.2.2
// @description  Fixes issues with reddit image previews. Specifically, clicking image preview now links directly to image (instead of thread) and fits height of image previews in carousel so they don't get clipped out.
// @author       Lawrence Sim
// @license      WTFPL (http://www.wtfpl.net)
// @grant        none
// @match        *://*.reddit.com/*
// ==/UserScript==
'use strict';
(function() {
    function fixImage(img, fixHeight) {
        if(!img || img.getAttribute("ifix")) return;
        if(fixHeight) {
            img.style.height = "100%";
            img.parentElement.style.height = "100%";
        }
        img.addEventListener("click", evt => {
            window.open(img.getAttribute("src").replace("preview.redd.it", "i.redd.it"));
            evt.stopPropagation();
            evt.preventDefault();
        });
        img.setAttribute("ifix", 1);
    }
    var watchGallery = new MutationObserver(mutated => {
        mutated.forEach(mutant => {
            mutant.addedNodes.forEach(node => {
                if(node.nodeName == "IMG") fixImage(node, true);
            });
        });
    });
    function checkPost(mutated) {
        mutated[0].addedNodes.forEach(node => {
            if(!node.querySelectorAll) return;
            node.querySelectorAll("img[alt='Post image']")
                .forEach(img => fixImage(img));
            let gallery = node.querySelector("ul");
            if(gallery) {
                watchGallery.observe(gallery, {childList: true, subtree:true});
                gallery.querySelectorAll("li figure img")
                    .forEach(img => fixImage(img, true));
            }
        });
    }
    var watchPost = new MutationObserver(checkPost);
    function processNodes(nodes) {
        nodes.forEach(node => {
            node.querySelectorAll("div[data-testid='post-container']").forEach(post => {
                if(post.getAttribute("ifix")) return;
                let postbg = post.querySelector("[data-click-id='background']");
                if(postbg) watchPost.observe(postbg, {childList:true});
                post.setAttribute("ifix", 1);
            });
        });
    }
    var lastFeedWatcher = null,
        lastFeedWrapper = null;
    (new MutationObserver(() => {
        let listingLayout = document.querySelector(".ListingLayout-outerContainer"),
            firstPost = listingLayout && listingLayout.querySelector("div[data-testid='post-container']"),
            feedWrapper = firstPost ? firstPost.parentNode.parentNode.parentNode : listingLayout;
        if(feedWrapper && feedWrapper !== lastFeedWrapper) {
            processNodes([feedWrapper]);
            let watcher = new MutationObserver(mutated => mutated.forEach(mutant => processNodes(mutant.addedNodes)));
            watcher.observe(feedWrapper, {childList:true});
            if(lastFeedWatcher) lastFeedWatcher.disconnect();
            if(lastFeedWrapper) lastFeedWrapper = null;
            lastFeedWatcher = watcher;
            lastFeedWrapper = feedWrapper;
        }
    })).observe(document.body, {childList:true, subtree:true});
})();