Creates a table of contents for some markdown-based websites
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// ==UserScript==
// @name Markdown Table Of Contents
// @version 1.0
// @author Rust1667
// @description Creates a table of contents for some markdown-based websites
// @match https://rentry.co/*
// @match https://rentry.org/*
// @match https://*.reddit.com/r/*/wiki/*
// @match https://*.github.io/*
// @match https://saidit.net/s/*/wiki/*
// @grant none
// @namespace https://greasyfork.org/users/980489
// ==/UserScript==
(function() {
'use strict';
let currentPageUrl = window.location.href;
let indexContainer = null;
function createIndex() {
let subheaderSelector = 'h2[id], h3[id], h4[id], h5[id], h6[id]';
// Check if there is more than one h1 subheader
if (document.querySelectorAll('h1[id]').length > 1) {
subheaderSelector = 'h1[id], ' + subheaderSelector;
}
const subheaders = document.querySelectorAll(subheaderSelector);
if (subheaders.length === 0) {
removeIndex();
return;
}
// Determine the highest subheader tier
let highestTier = 7; // Set to 7 to ensure padding is always greater
subheaders.forEach(subheader => {
const level = parseInt(subheader.tagName[1]);
if (level < highestTier) {
highestTier = level;
}
});
// Remove existing index container if it exists
if (indexContainer) {
indexContainer.remove();
}
indexContainer = document.createElement('div');
indexContainer.style.position = 'fixed';
indexContainer.style.top = '50%';
indexContainer.style.right = '0';
indexContainer.style.transform = 'translateY(-50%)'; // Adjust to center vertically
indexContainer.style.backgroundColor = getComputedStyle(document.body).getPropertyValue('background-color');
indexContainer.style.border = '1px solid #ced4da';
indexContainer.style.padding = '0'; // Remove padding
indexContainer.style.zIndex = '9999';
indexContainer.style.maxHeight = '80vh';
indexContainer.style.overflowY = 'auto';
indexContainer.style.maxWidth = '200px'; // Limit maximum width
const indexList = document.createElement('ul');
indexList.style.margin = '0'; // Remove margin
indexList.style.padding = '0'; // Remove padding
indexList.style.listStyleType = 'none'; // Remove bullet points
subheaders.forEach(subheader => {
const listItem = document.createElement('li');
const link = document.createElement('a');
let textContent = subheader.textContent.trim();
// Trim long titles
if (textContent.length > 20) {
textContent = textContent.substring(0, 20) + '...';
}
link.textContent = textContent;
link.href = '#' + subheader.id;
link.style.whiteSpace = 'nowrap'; // Prevent line breaks
link.style.overflow = 'hidden'; // Hide overflowing text
link.style.textOverflow = 'ellipsis'; // Add ellipsis for overflow
const level = parseInt(subheader.tagName[1]);
listItem.style.paddingLeft = (level - highestTier) * 2 + 'em'; // Adjust padding based on the difference from the highest tier
indexList.appendChild(listItem);
listItem.appendChild(link);
});
indexContainer.appendChild(indexList);
document.body.appendChild(indexContainer);
}
function removeIndex() {
if (indexContainer) {
indexContainer.remove();
indexContainer = null;
}
}
function checkUrlChange() {
const newUrl = window.location.href;
if (newUrl !== currentPageUrl) {
currentPageUrl = newUrl;
createIndex();
} else if (!document.querySelector('h1[id], h2[id], h3[id], h4[id], h5[id], h6[id]')) {
// Page URL hasn't changed, but no subheaders found
removeIndex();
}
}
// Check if the page has subheaders that can be linked to with a URL
const hasSubheaders = document.querySelector('h1[id], h2[id], h3[id], h4[id], h5[id], h6[id]');
if (hasSubheaders) {
createIndex();
// Uncommenting the interval check
setInterval(checkUrlChange, 1000); // Check for URL change every second
}
})();