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- import {svg} from '../svg.js';
-
- const addPrefix = (str) => `user-content-${str}`;
- const removePrefix = (str) => str.replace(/^user-content-/, '');
- const hasPrefix = (str) => str.startsWith('user-content-');
-
- // scroll to anchor while respecting the `user-content` prefix that exists on the target
- function scrollToAnchor(encodedId) {
- if (!encodedId) return;
- const id = decodeURIComponent(encodedId);
- const prefixedId = addPrefix(id);
- let el = document.getElementById(prefixedId);
-
- // check for matching user-generated `a[name]`
- if (!el) {
- const nameAnchors = document.getElementsByName(prefixedId);
- if (nameAnchors.length) {
- el = nameAnchors[0];
- }
- }
-
- // compat for links with old 'user-content-' prefixed hashes
- if (!el && hasPrefix(id)) {
- return document.getElementById(id)?.scrollIntoView();
- }
-
- el?.scrollIntoView();
- }
-
- export function initMarkupAnchors() {
- const markupEls = document.querySelectorAll('.markup');
- if (!markupEls.length) return;
-
- for (const markupEl of markupEls) {
- // create link icons for markup headings, the resulting link href will remove `user-content-`
- for (const heading of markupEl.querySelectorAll('h1, h2, h3, h4, h5, h6')) {
- const a = document.createElement('a');
- a.classList.add('anchor');
- a.setAttribute('href', `#${encodeURIComponent(removePrefix(heading.id))}`);
- a.innerHTML = svg('octicon-link');
- heading.prepend(a);
- }
-
- // remove `user-content-` prefix from links so they don't show in url bar when clicked
- for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
- const href = a.getAttribute('href');
- if (!href.startsWith('#user-content-')) continue;
- a.setAttribute('href', `#${removePrefix(href.substring(1))}`);
- }
-
- // add `user-content-` prefix to user-generated `a[name]` link targets
- // TODO: this prefix should be added in backend instead
- for (const a of markupEl.querySelectorAll('a[name]')) {
- const name = a.getAttribute('name');
- if (!name) continue;
- a.setAttribute('name', addPrefix(a.name));
- }
-
- for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
- a.addEventListener('click', (e) => {
- scrollToAnchor(e.currentTarget.getAttribute('href')?.substring(1));
- });
- }
- }
-
- // scroll to anchor unless the browser has already scrolled somewhere during page load
- if (!document.querySelector(':target')) {
- scrollToAnchor(window.location.hash?.substring(1));
- }
- }
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