Add Copy Button to Chat Messages on Gtihub Copilot web page

Adds a "Copy" button to chat message elements to easily copy their content.
当前为 2024-12-10 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Add Copy Button to Chat Messages on Gtihub Copilot web page
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  Adds a "Copy" button to chat message elements to easily copy their content.
// @author       aspen138
// @match        *://github.com/copilot/c/*
// @match        *://github.com/copilot/
// @match        *://github.com/copilot/*
// @grant        none
// @run-at       document-end
// @icon         https://github.com/favicons/favicon-copilot.svg
// @license      MIT
// ==/UserScript==





(function() {
    'use strict';

    // Update these if class names change
    const MESSAGE_CONTENT_CLASS = 'UserMessage-module__container--cAvvK';
    const CHAT_MESSAGE_CONTENT_CLASS = 'ChatMessage-module__content--MYneF';

    /**
     * Creates and returns a copy button element.
     */
    function createCopyButton() {
        const button = document.createElement('button');
        button.innerText = 'Copy';
        button.classList.add('copy-button');

        // Use sticky positioning to keep it visible while the element is in view
        button.style.position = 'sticky';
        button.style.top = '10px';
        button.style.right = '10px';
        button.style.backgroundColor = '#4CAF50';
        button.style.color = '#fff';
        button.style.border = 'none';
        button.style.borderRadius = '4px';
        button.style.padding = '5px 10px';
        button.style.cursor = 'pointer';
        button.style.fontSize = '0.9em';
        button.style.zIndex = '1000';
        button.style.boxShadow = '0 2px 6px rgba(0,0,0,0.2)';
        button.style.marginLeft = 'auto';
        button.style.float = 'right';
        button.style.display = 'inline-block';
        // Ensure parent or relevant ancestor allows sticky to function
        // For sticky to work, the ancestor should have no overflow constraints that break it.

        button.addEventListener('mouseenter', () => {
            button.style.backgroundColor = '#45a049';
        });
        button.addEventListener('mouseleave', () => {
            button.style.backgroundColor = '#4CAF50';
        });

        return button;
    }

    /**
     * Adds a copy button to a chat message element.
     * @param {HTMLElement} messageElement
     */
    function addCopyButton(messageElement) {
        // Prevent adding multiple buttons
        if (messageElement.querySelector('.copy-button')) return;

        const messageContent = messageElement.querySelector(`.${MESSAGE_CONTENT_CLASS}`);
        if (!messageContent) return;

        // Ensure the parent is a block-level container that supports sticky
        messageElement.style.position = 'relative';
        messageElement.style.display = 'block';

        const copyButton = createCopyButton();

        copyButton.addEventListener('click', () => {
            const textToCopy = messageContent.innerText.trim();
            navigator.clipboard.writeText(textToCopy).then(() => {
                copyButton.innerText = 'Copied!';
                copyButton.style.backgroundColor = '#388E3C';
                setTimeout(() => {
                    copyButton.innerText = 'Copy';
                    copyButton.style.backgroundColor = '#4CAF50';
                }, 2000);
            }).catch(err => {
                console.error('Failed to copy text: ', err);
            });
        });

        messageElement.appendChild(copyButton);
    }

    /**
     * Processes all existing chat messages on page load.
     */
    function processExistingMessages() {
        const messageElements = document.querySelectorAll(`.${CHAT_MESSAGE_CONTENT_CLASS}`);
        messageElements.forEach(messageElement => addCopyButton(messageElement));
    }

    /**
     * Observes newly added messages dynamically.
     */
    function observeNewMessages() {
        const targetNode = document.body;
        const config = { childList: true, subtree: true };

        const callback = (mutationsList) => {
            for (const mutation of mutationsList) {
                if (mutation.type === 'childList') {
                    mutation.addedNodes.forEach(node => {
                        if (node.nodeType === Node.ELEMENT_NODE) {
                            if (node.classList && node.classList.contains(CHAT_MESSAGE_CONTENT_CLASS)) {
                                addCopyButton(node);
                            }
                            const nestedMessages = node.querySelectorAll(`.${CHAT_MESSAGE_CONTENT_CLASS}`);
                            nestedMessages.forEach(nestedNode => addCopyButton(nestedNode));
                        }
                    });
                }
            }
        };

        const observer = new MutationObserver(callback);
        observer.observe(targetNode, config);
    }

    function init() {
        processExistingMessages();
        observeNewMessages();
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }

})();