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fix: allow <br> line breaks in Mermaid node labels #289

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fix: allow <br> line breaks in Mermaid node labels #289

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9 changes: 9 additions & 0 deletions content/index.css
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Original file line number Diff line number Diff line change
Expand Up @@ -335,6 +335,15 @@ pre:has(> code.mermaid) {
height: 100%;
}

/*fix: allow <br> line breaks inside mermaid node labels
The github theme sets `code br { display: none }` which hides <br> inside
mermaid `<code>` elements, preventing multi-line node labels from rendering.
See: https://github.com/simov/markdown-viewer/issues/263 */
.markdown-body code.mermaid br,
.markdown-theme code.mermaid br {
display: inline !important;
}

/*mermaid text bold effect*/
svg[id^=mermaid] text {
stroke: none !important;
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15 changes: 14 additions & 1 deletion content/mermaid.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,18 @@ var mmd = (() => {
var walk = (regex, string, result = [], match = regex.exec(string)) =>
!match ? result : walk(regex, string, result.concat(match[1]))

var fixMermaidViewBox = () => {
document.querySelectorAll('pre code.mermaid svg').forEach((svg) => {
var bbox = svg.getBBox()
if (bbox.height > 0) {
var pad = 16
svg.setAttribute('viewBox',
(bbox.x - pad) + ' ' + (bbox.y - pad) + ' ' +
(bbox.width + pad * 2) + ' ' + (bbox.height + pad * 2))
}
})
}

return {
render: () => {
if (loaded) {
Expand All @@ -19,7 +31,7 @@ var mmd = (() => {
state._themes[state.theme] === 'dark' ||
(state._themes[state.theme] === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches)
? 'dark' : 'default'
mermaid.initialize({theme})
mermaid.initialize({theme, securityLevel: 'loose'})
mermaid.init({theme}, 'code.mermaid')
loaded = true

Expand All @@ -28,6 +40,7 @@ var mmd = (() => {
var svg = Array.from(document.querySelectorAll('pre code.mermaid svg'))
if (diagrams.length === svg.length) {
clearInterval(timeout)
setTimeout(fixMermaidViewBox, 100)
svg.forEach((diagram) => {
var panzoom = Panzoom(diagram, {canvas: true})
diagram.parentElement.parentElement.addEventListener('wheel', (e) => {
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