sass-site/source/helpers/components/anchors.ts
2023-04-21 21:01:43 +02:00

39 lines
1.3 KiB
TypeScript

import Token from 'markdown-it/lib/token';
import anchor from 'markdown-it-anchor/types';
// Custom permalink function, inspired by and modification of linkInsideHeader
// More context on custom permalink fns: https://github.com/valeriangalliat/markdown-it-anchor#custom-permalink
// linkInsideHeader function: https://github.com/valeriangalliat/markdown-it-anchor/blob/649582d58185b00cfb2ceee9b6b4cd6aafc645b7/permalink.js#L76
export const renderPermalink: anchor.PermalinkGenerator = (
slug,
opts: anchor.LinkInsideHeaderPermalinkOptions,
state,
idx,
) => {
opts.ariaHidden = false;
const title = state?.tokens[idx + 1].children
?.filter(
(token: Token) => token.type === 'text' || token.type === 'code_inline',
)
.reduce((acc, t) => acc + t.content, '');
const linkTokens = [
Object.assign(new state.Token('link_open', 'a', 1), {
attrs: [
['class', 'anchor'],
['href', `#${slug}`],
...(opts.ariaHidden ? [['aria-hidden', 'true']] : []),
],
}),
Object.assign(new state.Token('html_inline', '', 0), {
content: `<span class="visuallyhidden">${
title ? title : 'section'
} permalink'</span>`,
}),
new state.Token('link_close', 'a', -1),
];
state?.tokens[idx + 1]?.children?.push(...linkTokens);
};