GitHub Auto-Expand Diffs userscript

github-auto-expand-diffs.js

// ==UserScript==
// @name         GitHub Auto-Expand Diffs
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Automatically expands all collapsed code sections in GitHub diffs
// @author       You
// @match        https://github.com/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';

    function expandAllDiffs() {
        // Find all expand buttons using the class name pattern
        const expandButtons = document.querySelectorAll('button.js-expand-all-difflines-button');
        
        if (expandButtons.length > 0) {
            console.log(`Found ${expandButtons.length} collapsed diff sections, expanding...`);
            
            expandButtons.forEach((button, index) => {
                // Small delay between clicks to avoid overwhelming the page
                setTimeout(() => {
                    button.click();
                    console.log(`Expanded diff ${index + 1}/${expandButtons.length}: ${button.getAttribute('data-file-path')}`);
                }, index * 100);
            });
        }
    }

    // Run when the page loads
    expandAllDiffs();

    // Also watch for dynamic content changes (GitHub uses a lot of AJAX)
    const observer = new MutationObserver((mutations) => {
        // Check if new diff content has been added
        for (const mutation of mutations) {
            if (mutation.addedNodes.length > 0) {
                // Look for expand buttons in the new content
                const hasNewDiffs = Array.from(mutation.addedNodes).some(node => {
                    if (node.nodeType === 1) { // Element node
                        return node.querySelector && node.querySelector('.js-expand-all-difflines-button');
                    }
                    return false;
                });
                
                if (hasNewDiffs) {
                    setTimeout(expandAllDiffs, 500); // Small delay to let the page settle
                    break;
                }
            }
        }
    });

    // Start observing the document for changes
    observer.observe(document.body, {
        childList: true,
        subtree: true
    });

    // Also run when navigating between pages (GitHub is a SPA)
    let lastUrl = location.href;
    new MutationObserver(() => {
        const url = location.href;
        if (url !== lastUrl) {
            lastUrl = url;
            setTimeout(expandAllDiffs, 1000);
        }
    }).observe(document, {subtree: true, childList: true});
})();