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GitHub Gist Copier

Adds copy button to Gist files for easy code copying.

Ajankohdalta 7.4.2025. Katso uusin versio.

// ==UserScript==
// @name         GitHub Gist Copier
// @description  Adds copy button to Gist files for easy code copying.
// @icon         https://github.githubassets.com/favicons/favicon-dark.svg
// @version      1.1
// @author       afkarxyz
// @namespace    https://github.com/afkarxyz/userscripts/
// @supportURL   https://github.com/afkarxyz/userscripts/issues
// @license      MIT
// @run-at       document-end
// @match        https://gist.github.com/*
// @grant        GM_xmlhttpRequest
// @grant        GM_setClipboard
// @connect      githubusercontent.com
// ==/UserScript==

(function() {
    'use strict';

    function noop() { }

    function debounce(f, delay) {
        let timeoutId = null;
        return function (...args) {
            if (timeoutId) {
                clearTimeout(timeoutId);
            }
            timeoutId = setTimeout(() => {
                f.apply(this, args);
            }, delay);
        };
    }

    function createCopyButton(fileElement) {
        const fileActionElement = fileElement.querySelector('.file-actions');
        if (!fileActionElement) {
            return noop;
        }

        const rawButton = fileActionElement.querySelector('a[href*="/raw/"]');
        if (!rawButton) {
            return noop;
        }
        
        const button = document.createElement('button');
        button.className = 'btn-octicon gist-copy-button';
        button.style.marginRight = '5px';

        button.innerHTML = `
        <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy">
            <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
        </svg>

        <svg style="display: none;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check color-fg-success">
            <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
        </svg>
        `;

        const copyIcon = button.querySelector('.octicon-copy');
        const checkIcon = button.querySelector('.octicon-check');

        let timeoutId = null;
        const copyHandler = (e) => {
            if (timeoutId) {
                return;
            }
            e.preventDefault();

            const rawUrl = rawButton.href;
            
            GM_xmlhttpRequest({
                method: 'GET',
                url: rawUrl,
                onload: function(response) {
                    if (response.status === 200) {
                        GM_setClipboard(response.responseText, { type: 'text', mimetype: 'text/plain' });
                        
                        copyIcon.style.display = 'none';
                        checkIcon.style.display = 'inline-block';
                        
                        timeoutId = setTimeout(() => {
                            copyIcon.style.display = 'inline-block';
                            checkIcon.style.display = 'none';
                            timeoutId = null;
                        }, 500);
                    }
                },
                onerror: function(error) {
                    timeoutId = null;
                }
            });
        };

        button.addEventListener('click', copyHandler);
        fileActionElement.insertBefore(button, fileActionElement.firstChild);

        return () => {
            button.removeEventListener('click', copyHandler);
            if (timeoutId) {
                clearTimeout(timeoutId);
            }
            button.remove();
        };
    }

    function runGistCopy() {
        let removeAllListeners = noop;
        
        function tryCreateCopyButtons() {
            removeAllListeners();
            const fileElements = [...document.querySelectorAll('.file')];
            const removeListeners = fileElements.map(createCopyButton);
            removeAllListeners = () => {
                removeListeners.map((f) => f());
                [...document.querySelectorAll('.gist-copy-button')].forEach((el) => {
                    el.remove();
                });
            };
        }

        setTimeout(tryCreateCopyButtons, 300);

        const observer = new MutationObserver(debounce(() => {
            if (document.querySelectorAll('.file').length > 0 &&
                document.querySelectorAll('.gist-copy-button').length === 0) {
                tryCreateCopyButtons();
            }
        }, 100));

        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
        
        if (window.onurlchange === null) {
            window.addEventListener('urlchange', debounce(tryCreateCopyButtons, 16));
        }
    }

    runGistCopy();
})();