58 lines
1.4 KiB
JavaScript
58 lines
1.4 KiB
JavaScript
// Renders diagrams and flowcharts from text using Mermaid in any element with the
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// `js-render-mermaid` class.
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//
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// Example markup:
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//
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// <pre class="js-render-mermaid">
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// graph TD;
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// A-- > B;
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// A-- > C;
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// B-- > D;
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// C-- > D;
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// </pre>
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//
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import Flash from './flash';
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export default function renderMermaid($els) {
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if (!$els.length) return;
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import(/* webpackChunkName: 'mermaid' */ 'blackst0ne-mermaid').then((mermaid) => {
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mermaid.initialize({
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// mermaid core options
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mermaid: {
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startOnLoad: false,
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},
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// mermaidAPI options
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theme: 'neutral',
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});
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$els.each((i, el) => {
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const source = el.textContent;
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// Remove any extra spans added by the backend syntax highlighting.
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Object.assign(el, { textContent: source });
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mermaid.init(undefined, el, (id) => {
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const svg = document.getElementById(id);
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svg.classList.add('mermaid');
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// pre > code > svg
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svg.closest('pre').replaceWith(svg);
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// We need to add the original source into the DOM to allow Copy-as-GFM
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// to access it.
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const sourceEl = document.createElement('text');
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sourceEl.classList.add('source');
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sourceEl.setAttribute('display', 'none');
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sourceEl.textContent = source;
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svg.appendChild(sourceEl);
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});
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});
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}).catch((err) => {
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Flash(`Can't load mermaid module: ${err}`);
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});
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}
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