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47 lines
1.6 KiB
TypeScript
47 lines
1.6 KiB
TypeScript
import Token from 'markdown-it/lib/token';
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import type anchor from 'markdown-it-anchor';
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/**
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* Custom permalink function, inspired by `linkInsideHeader`,
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* modified to include title text in permalink a11y text.
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* @see https://github.com/valeriangalliat/markdown-it-anchor#custom-permalink
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* @see https://github.com/valeriangalliat/markdown-it-anchor/blob/649582d58185b00cfb2ceee9b6b4cd6aafc645b7/permalink.js#L76
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*/
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export const renderPermalink: anchor.PermalinkGenerator = (
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slug,
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opts: anchor.LinkInsideHeaderPermalinkOptions,
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state,
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idx,
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) => {
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// https://github.com/valeriangalliat/markdown-it-anchor/blob/649582d58185b00cfb2ceee9b6b4cd6aafc645b7/permalink.js#L148-L151
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const title = state.tokens[idx + 1]?.children
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?.filter(
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(token: Token) => token.type === 'text' || token.type === 'code_inline',
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)
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.reduce((acc, t) => acc + t.content, '');
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opts.class = 'anchor';
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opts.ariaHidden = false;
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opts.symbol = `<span class="visuallyhidden">${
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title || 'section'
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} permalink</span>`;
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// https://github.com/valeriangalliat/markdown-it-anchor/blob/649582d58185b00cfb2ceee9b6b4cd6aafc645b7/permalink.js#L77-L97
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const linkTokens = [
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Object.assign(new state.Token('link_open', 'a', 1), {
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attrs: [
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...(opts.class ? [['class', opts.class]] : []),
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['href', `#${slug}`],
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...(opts.ariaHidden ? [['aria-hidden', 'true']] : []),
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],
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}),
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Object.assign(new state.Token('html_inline', '', 0), {
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content: opts.symbol,
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meta: { isPermalinkSymbol: true },
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}),
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new state.Token('link_close', 'a', -1),
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];
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state.tokens[idx + 1]?.children?.push(...linkTokens);
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};
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