Add a button to GitHub header to quickly access trending page
// ==UserScript==
// @name GitHub Trending Button
// @namespace https://github.com/wenyuanw
// @version 1.2.0
// @description Add a button to GitHub header to quickly access trending page
// @author wenyuan
// @match https://github.com/*
// @icon https://github.githubassets.com/favicons/favicon.svg
// @grant none
// @run-at document-end
// @license MIT
// ==/UserScript==
(function() {
'use strict';
const BUTTON_ID = 'trending-button';
const TOOLTIP_ID = 'trending-button-tooltip';
function createIcon() {
// 与当前顶栏 octicon 一致（无旧版 Button-visual）
return `
<svg aria-hidden="true" focusable="false" class="octicon octicon-graph" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom">
<path d="M1.5 1.75V13.5h13.75a.75.75 0 0 1 0 1.5H.75a.75.75 0 0 1-.75-.75V1.75a.75.75 0 0 1 1.5 0Zm14.28 2.53-5.25 5.25a.75.75 0 0 1-1.06 0L7 7.06 4.28 9.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.25-3.25a.75.75 0 0 1 1.06 0L10 7.94l4.72-4.72a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042Z"></path>
</svg>
`;
}
/** 新版 Primer 顶栏 vs 旧版 App Header */
function findHeaderActionsContainer() {
return (
document.querySelector('[data-testid="top-nav-right"]') ||
document.querySelector('.AppHeader-actions')
);
}
/** 插入在通知图标前，与 Issues/PR 等并列 */
function findInsertBefore(actionsContainer) {
const notifications = actionsContainer.querySelector(
'a[href="/notifications"], a[href$="/notifications"]'
);
if (notifications) return notifications;
return (
actionsContainer.querySelector('notification-indicator') ||
actionsContainer.querySelector('.AppHeader-user') ||
actionsContainer.querySelector('[data-testid="github-avatar"]')?.closest('button')?.parentElement ||
null
);
}
function addTrendingButton() {
const actionsContainer = findHeaderActionsContainer();
if (!actionsContainer) return false;
if (document.getElementById(BUTTON_ID)) return true;
const trendingButton = document.createElement('a');
trendingButton.id = BUTTON_ID;
trendingButton.href = '/trending';
trendingButton.setAttribute('data-discover', 'true');
const styleRef =
actionsContainer.querySelector('a[href="/issues"], a[href$="/issues"]') ||
actionsContainer.querySelector('a[data-component="IconButton"]');
if (styleRef) {
trendingButton.className = styleRef.className;
Array.from(styleRef.attributes).forEach((attr) => {
if (
attr.name === 'href' ||
attr.name === 'id' ||
attr.name === 'aria-labelledby'
) {
return;
}
if (!trendingButton.hasAttribute(attr.name)) {
trendingButton.setAttribute(attr.name, attr.value);
}
});
} else {
trendingButton.className =
'Button Button--iconOnly Button--secondary Button--medium AppHeader-button color-fg-muted';
}
trendingButton.setAttribute('aria-labelledby', TOOLTIP_ID);
trendingButton.innerHTML = createIcon();
const isNewHeader = actionsContainer.hasAttribute('data-testid');
let tooltip;
if (isNewHeader) {
tooltip = document.createElement('span');
tooltip.id = TOOLTIP_ID;
const issuesTip = styleRef?.nextElementSibling;
if (
issuesTip &&
issuesTip.tagName === 'SPAN' &&
issuesTip.hasAttribute('popover')
) {
tooltip.className = issuesTip.className;
const dir = issuesTip.getAttribute('data-direction');
if (dir) tooltip.setAttribute('data-direction', dir);
} else {
tooltip.setAttribute('data-direction', 's');
}
tooltip.setAttribute('aria-hidden', 'true');
tooltip.setAttribute('popover', 'auto');
tooltip.textContent = 'Trending repositories';
} else {
tooltip = document.createElement('tool-tip');
tooltip.id = TOOLTIP_ID;
tooltip.setAttribute('for', BUTTON_ID);
tooltip.setAttribute('popover', 'manual');
tooltip.setAttribute('data-direction', 's');
tooltip.setAttribute('data-type', 'label');
tooltip.setAttribute('data-view-component', 'true');
tooltip.className = 'sr-only position-absolute';
tooltip.textContent = 'Trending repositories';
}
const refNode = findInsertBefore(actionsContainer);
if (refNode) {
actionsContainer.insertBefore(trendingButton, refNode);
actionsContainer.insertBefore(tooltip, refNode);
} else {
actionsContainer.appendChild(trendingButton);
actionsContainer.appendChild(tooltip);
}
return true;
}
// 主执行逻辑
function main() {
if (!addTrendingButton()) {
// 如果首次失败，启动 Observer
const observer = new MutationObserver((mutations, obs) => {
if (addTrendingButton()) {
obs.disconnect();
}
});
// 限制 Observer 的范围，尽量不监听整个 body，除非迫不得已
// 但 header 通常是 body 的直接子元素或很浅的层级
observer.observe(document.body, {
childList: true,
subtree: true
});
// 5秒后停止监听，节省资源
setTimeout(() => observer.disconnect(), 5000);
}
}
// 立即运行
main();
// 适配 GitHub Turbo (SPA 导航)
// 每次页面软导航结束时，重新检查按钮是否存在
document.addEventListener('turbo:load', main);
document.addEventListener('turbo:render', main); // 处理一些局部更新
})();