Bug/4391 make markdown auto wrapping optional

.husky/pre-commit

@@ -1,4 +1,4 @@
 #!/bin/sh
 . "$(dirname "$0")/_/husky.sh"
 
-NODE_OPTIONS=--max_old_space_size=8192 pnpm run pre-commit
+NODE_OPTIONS="--max_old_space_size=8192" pnpm run pre-commit

cypress/integration/rendering/flowchart-v2.spec.js

@@ -904,6 +904,18 @@ end
         );
       });
     });
+
+    it('should not auto wrap when markdownAutoWrap is false', () => {
+      imgSnapshotTest(
+        `flowchart TD
+    angular_velocity["\`**angular_velocity**
+      *angular_displacement / duration*
+      [rad/s, 1/s]
+      {vector}\`"]
+    frequency["frequency\n(1 / period_duration)\n[Hz, 1/s]"]`,
+        { markdownAutoWrap: false }
+      );
+    });
   });
   describe('Subgraph title margins', () => {
     it('Should render subgraphs with title margins set (LR)', () => {

docs/config/setup/modules/config.md

@@ -50,7 +50,7 @@ Pushes in a directive to the configuration
 | --------- | ------------------------- | ----------- | ------------------------------ |
 | getConfig | Obtains the currentConfig | Get Request | Any Values from current Config |
 
-**Notes**: Returns **any** the currentConfig
+**Notes**: Avoid calling this function repeatedly. Instead, store the result in a variable and use it, and pass it down to function calls.
 
 #### Returns
 

docs/syntax/flowchart.md

@@ -852,6 +852,16 @@ Formatting:
 
 This feature is applicable to node labels, edge labels, and subgraph labels.
 
+The auto wrapping can be disabled by using
+
+```
+---
+config:
+  markdownAutoWrap: false
+---
+graph LR
+```
+
 ## Interaction
 
 It is possible to bind a click event to a node, the click can lead to either a javascript callback or to a link which will be opened in a new browser tab.

packages/mermaid/src/config.ts

@@ -124,7 +124,7 @@ export const setConfig = (conf: MermaidConfig): MermaidConfig => {
  * | --------- | ------------------------- | ----------- | ------------------------------ |
  * | getConfig | Obtains the currentConfig | Get Request | Any Values from current Config |
  *
- * **Notes**: Returns **any** the currentConfig
+ * **Notes**: Avoid calling this function repeatedly. Instead, store the result in a variable and use it, and pass it down to function calls.
  *
  * @returns The currentConfig
  */

packages/mermaid/src/config.type.ts

@@ -159,6 +159,7 @@ export interface MermaidConfig {
   dompurifyConfig?: DOMPurifyConfiguration;
   wrap?: boolean;
   fontSize?: number;
+  markdownAutoWrap?: boolean;
   /**
    * Suppresses inserting 'Syntax error' diagram in the DOM.
    * This is useful when you want to control how to handle syntax errors in your application.

packages/mermaid/src/dagre-wrapper/clusters.js

@@ -30,7 +30,7 @@ const rect = (parent, node) => {
   //   .appendChild(createLabel(node.labelText, node.labelStyle, undefined, true));
   const text =
     node.labelType === 'markdown'
-      ? createText(label, node.labelText, { style: node.labelStyle, useHtmlLabels })
+      ? createText(label, node.labelText, { style: node.labelStyle, useHtmlLabels }, siteConfig)
       : label.node().appendChild(createLabel(node.labelText, node.labelStyle, undefined, true));
 
   // Get the size of the label

packages/mermaid/src/dagre-wrapper/edges.js

@@ -18,15 +18,21 @@ export const clear = () => {
 };
 
 export const insertEdgeLabel = (elem, edge) => {
-  const useHtmlLabels = evaluate(getConfig().flowchart.htmlLabels);
+  const config = getConfig();
+  const useHtmlLabels = evaluate(config.flowchart.htmlLabels);
   // Create the actual text element
   const labelElement =
     edge.labelType === 'markdown'
-      ? createText(elem, edge.label, {
-          style: edge.labelStyle,
-          useHtmlLabels,
-          addSvgBackground: true,
-        })
+      ? createText(
+          elem,
+          edge.label,
+          {
+            style: edge.labelStyle,
+            useHtmlLabels,
+            addSvgBackground: true,
+          },
+          config
+        )
       : createLabel(edge.label, edge.labelStyle);
 
   // Create outer g, edgeLabel, this will be positioned after graph layout

packages/mermaid/src/dagre-wrapper/shapes/util.js

@@ -6,8 +6,9 @@ import { evaluate, sanitizeText } from '../../diagrams/common/common.js';
 import { decodeEntities } from '../../utils.js';
 
 export const labelHelper = async (parent, node, _classes, isNode) => {
+  const config = getConfig();
   let classes;
-  const useHtmlLabels = node.useHtmlLabels || evaluate(getConfig().flowchart.htmlLabels);
+  const useHtmlLabels = node.useHtmlLabels || evaluate(config.flowchart.htmlLabels);
   if (!_classes) {
     classes = 'node default';
   } else {
@@ -35,26 +36,26 @@ export const labelHelper = async (parent, node, _classes, isNode) => {
   let text;
   if (node.labelType === 'markdown') {
     // text = textNode;
-    text = createText(label, sanitizeText(decodeEntities(labelText), getConfig()), {
-      useHtmlLabels,
-      width: node.width || getConfig().flowchart.wrappingWidth,
-      classes: 'markdown-node-label',
-    });
+    text = createText(
+      label,
+      sanitizeText(decodeEntities(labelText), config),
+      {
+        useHtmlLabels,
+        width: node.width || config.flowchart.wrappingWidth,
+        classes: 'markdown-node-label',
+      },
+      config
+    );
   } else {
     text = textNode.appendChild(
-      createLabel(
-        sanitizeText(decodeEntities(labelText), getConfig()),
-        node.labelStyle,
-        false,
-        isNode
-      )
+      createLabel(sanitizeText(decodeEntities(labelText), config), node.labelStyle, false, isNode)
     );
   }
   // Get the size of the label
   let bbox = text.getBBox();
   const halfPadding = node.padding / 2;
 
-  if (evaluate(getConfig().flowchart.htmlLabels)) {
+  if (evaluate(config.flowchart.htmlLabels)) {
     const div = text.children[0];
     const dv = select(text);
 
@@ -76,8 +77,8 @@ export const labelHelper = async (parent, node, _classes, isNode) => {
 
                 if (noImgText) {
                   // default size if no text
-                  const bodyFontSize = getConfig().fontSize
-                    ? getConfig().fontSize
+                  const bodyFontSize = config.fontSize
+                    ? config.fontSize
                     : window.getComputedStyle(document.body).fontSize;
                   const enlargingFactor = 5;
                   const width = parseInt(bodyFontSize, 10) * enlargingFactor + 'px';

packages/mermaid/src/diagrams/common/common.ts

@@ -346,11 +346,9 @@ export const renderKatex = async (text: string, config: MermaidConfig): Promise<
     .split(lineBreakRegex)
     .map((line) =>
       hasKatex(line)
-        ? `
-            <div style="display: flex; align-items: center; justify-content: center; white-space: nowrap;">
+        ? `<div style="display: flex; align-items: center; justify-content: center; white-space: nowrap;">
               ${line}
-            </div>
-          `
+            </div>`
         : `<div>${line}</div>`
     )
     .join('')

packages/mermaid/src/diagrams/mindmap/svgDraw.ts

@@ -196,11 +196,16 @@ export const drawNode = function (
   // Create the wrapped text element
   const textElem = nodeElem.append('g');
   const description = node.descr.replace(/(<br\/*>)/g, '\n');
-  const newEl = createText(textElem, description, {
-    useHtmlLabels: htmlLabels,
-    width: node.width,
-    classes: 'mindmap-node-label',
-  });
+  const newEl = createText(
+    textElem,
+    description,
+    {
+      useHtmlLabels: htmlLabels,
+      width: node.width,
+      classes: 'mindmap-node-label',
+    },
+    conf
+  );
 
   if (!htmlLabels) {
     textElem

packages/mermaid/src/docs/syntax/flowchart.md

@@ -537,6 +537,16 @@ Formatting:
 
 This feature is applicable to node labels, edge labels, and subgraph labels.
 
+The auto wrapping can be disabled by using
+
+```
+---
+config:
+  markdownAutoWrap: false
+---
+graph LR
+```
+
 ## Interaction
 
 It is possible to bind a click event to a node, the click can lead to either a javascript callback or to a link which will be opened in a new browser tab.

packages/mermaid/src/rendering-util/createText.ts

@@ -1,5 +1,6 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 // @ts-nocheck TODO: Fix types
+import type { MermaidConfig } from '../config.type.js';
 import type { Group } from '../diagram-api/types.js';
 import type { D3TSpanElement, D3TextElement } from '../diagrams/common/commonTypes.js';
 import { log } from '../logger.js';
@@ -21,8 +22,7 @@ function addHtmlSpan(element, node, width, classes, addBackground = false) {
   const label = node.label;
   const labelClass = node.isNode ? 'nodeLabel' : 'edgeLabel';
   div.html(
-    `
-    <span class="${labelClass} ${classes}" ` +
+    `<span class="${labelClass} ${classes}" ` +
       (node.labelStyle ? 'style="' + node.labelStyle + '"' : '') +
       '>' +
       label +
@@ -181,14 +181,14 @@ export const createText = (
     isNode = true,
     width = 200,
     addSvgBackground = false,
-  } = {}
+  } = {},
+  config: MermaidConfig
 ) => {
   log.info('createText', text, style, isTitle, classes, useHtmlLabels, isNode, addSvgBackground);
   if (useHtmlLabels) {
     // TODO: addHtmlLabel accepts a labelStyle. Do we possibly have that?
-    // text = text.replace(/\\n|\n/g, '<br />');
-    const htmlText = markdownToHTML(text);
-    // log.info('markdownToHTML' + text, markdownToHTML(text));
+
+    const htmlText = markdownToHTML(text, config);
     const node = {
       isNode,
       label: decodeEntities(htmlText).replace(
@@ -200,7 +200,7 @@ export const createText = (
     const vertexNode = addHtmlSpan(el, node, width, classes, addSvgBackground);
     return vertexNode;
   } else {
-    const structuredText = markdownToLines(text);
+    const structuredText = markdownToLines(text, config);
     const svgLabel = createFormattedText(width, el, structuredText, addSvgBackground);
     return svgLabel;
   }

packages/mermaid/src/rendering-util/handle-markdown-text.spec.ts

@@ -1,3 +1,4 @@
+/* eslint-disable no-irregular-whitespace */
 import { markdownToLines, markdownToHTML } from './handle-markdown-text.js';
 import { test, expect } from 'vitest';
 
@@ -203,6 +204,31 @@ Word!`;
   expect(output).toEqual(expectedOutput);
 });
 
+test('markdownToLines - No auto wrapping', () => {
+  expect(
+    markdownToLines(
+      `Hello, how do
+  you do?`,
+      { markdownAutoWrap: false }
+    )
+  ).toMatchInlineSnapshot(`
+    [
+      [
+        {
+          "content": "Hello, how do",
+          "type": "normal",
+        },
+      ],
+      [
+        {
+          "content": "you do?",
+          "type": "normal",
+        },
+      ],
+    ]
+  `);
+});
+
 test('markdownToHTML - Basic test', () => {
   const input = `This is regular text
 Here is a new line
@@ -262,3 +288,13 @@ test('markdownToHTML - Unsupported formatting', () => {
   - l3`)
   ).toMatchInlineSnapshot('"<p>Hello</p>Unsupported markdown: list"');
 });
+
+test('markdownToHTML - no auto wrapping', () => {
+  expect(
+    markdownToHTML(
+      `Hello, how do
+  you do?`,
+      { markdownAutoWrap: false }
+    )
+  ).toMatchInlineSnapshot('"<p>Hello,&nbsp;how&nbsp;do<br/>you&nbsp;do?</p>"');
+});

packages/mermaid/src/rendering-util/handle-markdown-text.ts

@@ -2,24 +2,28 @@ import type { Content } from 'mdast';
 import { fromMarkdown } from 'mdast-util-from-markdown';
 import { dedent } from 'ts-dedent';
 import type { MarkdownLine, MarkdownWordType } from './types.js';
+import type { MermaidConfig } from '../config.type.js';
 
 /**
  * @param markdown - markdown to process
  * @returns processed markdown
  */
-function preprocessMarkdown(markdown: string): string {
+function preprocessMarkdown(markdown: string, { markdownAutoWrap }: MermaidConfig): string {
   // Replace multiple newlines with a single newline
   const withoutMultipleNewlines = markdown.replace(/\n{2,}/g, '\n');
   // Remove extra spaces at the beginning of each line
   const withoutExtraSpaces = dedent(withoutMultipleNewlines);
+  if (markdownAutoWrap === false) {
+    return withoutExtraSpaces.replace(/ /g, ' ');
+  }
   return withoutExtraSpaces;
 }
 
 /**
  * @param markdown - markdown to split into lines
  */
-export function markdownToLines(markdown: string): MarkdownLine[] {
-  const preprocessedMarkdown = preprocessMarkdown(markdown);
+export function markdownToLines(markdown: string, config: MermaidConfig = {}): MarkdownLine[] {
+  const preprocessedMarkdown = preprocessMarkdown(markdown, config);
   const { children } = fromMarkdown(preprocessedMarkdown);
   const lines: MarkdownLine[] = [[]];
   let currentLine = 0;
@@ -56,11 +60,14 @@ export function markdownToLines(markdown: string): MarkdownLine[] {
   return lines;
 }
 
-export function markdownToHTML(markdown: string) {
+export function markdownToHTML(markdown: string, { markdownAutoWrap }: MermaidConfig = {}) {
   const { children } = fromMarkdown(markdown);
 
   function output(node: Content): string {
     if (node.type === 'text') {
+      if (markdownAutoWrap === false) {
+        return node.value.replace(/\n/g, '<br/>').replace(/ /g, '&nbsp;');
+      }
       return node.value.replace(/\n/g, '<br/>');
     } else if (node.type === 'strong') {
       return `<strong>${node.children.map(output).join('')}</strong>`;

packages/mermaid/src/schemas/config.schema.yaml

@@ -243,6 +243,9 @@ properties:
   fontSize:
     type: number
     default: 16
+  markdownAutoWrap:
+    type: boolean
+    default: true
   suppressErrorRendering:
     type: boolean
     default: false