generate catalog in Github readme page
// ==UserScript==
// @name github-md-catalog
// @namespace http://tampermonkey.net/
// @version 0.1
// @description generate catalog in Github readme page
// @author fengxxc
// @match https://github.com/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
function main() {
// 目录树缩进的步长
const PADDINGLEFT_STEP_LENGTH = 20;
if (window.location.hostname != 'github.com') return;
const mdDom = document.querySelector('article.markdown-body');
if (!mdDom) return;
let catalogs = [];
const titles = mdDom.querySelectorAll('h1,h2,h3,h4,h5,h6');
for (let i = 0; i < titles.length; i++) {
catalogs.push(
getPaddingLeftEl(parseInt(titles[i].tagName.slice(1)), PADDINGLEFT_STEP_LENGTH)
+ '<a href="#' + titles[i].innerText + '">' + titles[i].innerText + '</a><br>'
);
titles[i].insertAdjacentHTML('afterbegin', '<a name="' + titles[i].innerText + '"></a>');
}
document.body.insertAdjacentHTML('beforeend', '<nav id="github_md_catalog" style="position: fixed; top: 115px; right: 5px; max-width: 257px">' + catalogs.join('') + '</nav>');
}
function getPaddingLeftEl(tabStep, stepLength) {
return '<span style="display: inline-block; width: ' + tabStep * stepLength + 'px;"></span>';
}
main();
})();