From 52d0584ac2c9ece762c627dd25a9abbdef209b1b Mon Sep 17 00:00:00 2001
From: Tom Quist <tomquist@users.noreply.github.com>
Date: Tue, 10 Mar 2026 16:56:57 +0100
Subject: [PATCH] Add Mermaid diagram rendering support

Renders ```mermaid fenced code blocks as interactive SVG diagrams,
matching GitHub's rendering behavior.

- Add mermaid as a dependency
- Custom marked renderer extension intercepts mermaid code blocks and
  replaces them with placeholder divs, which are then rendered to SVG
  via mermaid.render() after DOMPurify sanitization
- Mermaid theme follows the dark/light mode toggle, re-rendering
  diagrams when the theme changes
- Add GitHub-style CSS for mermaid containers (centered, rounded
  background, error state styling)
- Include a mermaid flowchart example in the default template
---
 package-lock.json    | 1413 +++++++++++++++++++++++++++++++++++++++---
 package.json         |    1 +
 public/css/style.css |   39 ++
 src/main.js          |   82 ++-
 4 files changed, 1436 insertions(+), 99 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 923bab8..0a7f7d5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
         "dompurify": "^3.2.5",
         "github-markdown-css": "^5.8.1",
         "marked": "^15.0.7",
+        "mermaid": "^11.13.0",
         "monaco-editor": "^0.52.2",
         "storehouse-js": "github:tanabe/Storehouse-js"
       },
@@ -20,6 +21,64 @@
         "vite": "^6.4.1"
       }
     },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-1.1.0.tgz",
+      "integrity": "sha512-MGQsmw10ZyI+EJo45CdSER4zEb+p31LpDAFp2Z3gkSd1yqVZGi0Ebx++YTEMonJy4oChEMLsxZ64j8FH6sSqtQ==",
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-7.1.2.tgz",
+      "integrity": "sha512-jigsZK+sMF/cuiB7sERuo9V7N9jx+dhmHHnQyDSVdpZwVutaBu7WvNYqMDLSgFgfB30n452TP3vjDAvFC973mA==",
+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/cst-dts-gen": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-11.1.2.tgz",
+      "integrity": "sha512-XTsjvDVB5nDZBQB8o0o/0ozNelQtn2KrUVteIHSlPd2VAV2utEb6JzyCJaJ8tGxACR4RiBNWy5uYUHX2eji88Q==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "11.1.2",
+        "@chevrotain/types": "11.1.2",
+        "lodash-es": "4.17.23"
+      }
+    },
+    "node_modules/@chevrotain/gast": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/@chevrotain/gast/-/gast-11.1.2.tgz",
+      "integrity": "sha512-Z9zfXR5jNZb1Hlsd/p+4XWeUFugrHirq36bKzPWDSIacV+GPSVXdk+ahVWZTwjhNwofAWg/sZg58fyucKSQx5g==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/types": "11.1.2",
+        "lodash-es": "4.17.23"
+      }
+    },
+    "node_modules/@chevrotain/regexp-to-ast": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/@chevrotain/regexp-to-ast/-/regexp-to-ast-11.1.2.tgz",
+      "integrity": "sha512-nMU3Uj8naWer7xpZTYJdxbAs6RIv/dxYzkYU8GSwgUtcAAlzjcPfX1w+RKRcYG8POlzMeayOQ/znfwxEGo5ulw==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/types": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-11.1.2.tgz",
+      "integrity": "sha512-U+HFai5+zmJCkK86QsaJtoITlboZHBqrVketcO2ROv865xfCMSFpELQoz1GkX5GzME8pTa+3kbKrZHQtI0gdbw==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/utils": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/@chevrotain/utils/-/utils-11.1.2.tgz",
+      "integrity": "sha512-4mudFAQ6H+MqBTfqLmU7G1ZwRzCLfJEooL/fsF6rCX5eePMbGhoy5n4g+G4vlh2muDcsCTJtL+uKbOzWxs5LHA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/@esbuild/aix-ppc64": {
       "version": "0.25.2",
       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.2.tgz",
@@ -445,6 +504,32 @@
         "node": ">=18"
       }
     },
+    "node_modules/@iconify/types": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@iconify/types/-/types-2.0.0.tgz",
+      "integrity": "sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==",
+      "license": "MIT"
+    },
+    "node_modules/@iconify/utils": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@iconify/utils/-/utils-3.1.0.tgz",
+      "integrity": "sha512-Zlzem1ZXhI1iHeeERabLNzBHdOa4VhQbqAcOQaMKuTuyZCpwKbC2R4Dd0Zo3g9EAc+Y4fiarO8HIHRAth7+skw==",
+      "license": "MIT",
+      "dependencies": {
+        "@antfu/install-pkg": "^1.1.0",
+        "@iconify/types": "^2.0.0",
+        "mlly": "^1.8.0"
+      }
+    },
+    "node_modules/@mermaid-js/parser": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@mermaid-js/parser/-/parser-1.0.1.tgz",
+      "integrity": "sha512-opmV19kN1JsK0T6HhhokHpcVkqKpF+x2pPDKKM2ThHtZAB5F4PROopk0amuVYK5qMrIA4erzpNm8gmPNJgMDxQ==",
+      "license": "MIT",
+      "dependencies": {
+        "langium": "^4.0.0"
+      }
+    },
     "node_modules/@rollup/rollup-android-arm-eabi": {
       "version": "4.39.0",
       "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.39.0.tgz",
@@ -725,134 +810,973 @@
         "win32"
       ]
     },
-    "node_modules/@types/estree": {
-      "version": "1.0.7",
-      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.7.tgz",
-      "integrity": "sha512-w28IoSUCJpidD/TGviZwwMJckNESJZXFu7NBZ5YJ4mEUnNraUn9Pm8HSZm/jDF1pDWYKspWE7oVphigUPRakIQ==",
-      "dev": true,
-      "license": "MIT"
+    "node_modules/@types/d3": {
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@types/d3/-/d3-7.4.3.tgz",
+      "integrity": "sha512-lZXZ9ckh5R8uiFVt8ogUNf+pIrK4EsWrx2Np75WvF/eTpJ0FMHNhjXk8CKEx/+gpHbNQyJWehbFaTvqmHWB3ww==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/d3-axis": "*",
+        "@types/d3-brush": "*",
+        "@types/d3-chord": "*",
+        "@types/d3-color": "*",
+        "@types/d3-contour": "*",
+        "@types/d3-delaunay": "*",
+        "@types/d3-dispatch": "*",
+        "@types/d3-drag": "*",
+        "@types/d3-dsv": "*",
+        "@types/d3-ease": "*",
+        "@types/d3-fetch": "*",
+        "@types/d3-force": "*",
+        "@types/d3-format": "*",
+        "@types/d3-geo": "*",
+        "@types/d3-hierarchy": "*",
+        "@types/d3-interpolate": "*",
+        "@types/d3-path": "*",
+        "@types/d3-polygon": "*",
+        "@types/d3-quadtree": "*",
+        "@types/d3-random": "*",
+        "@types/d3-scale": "*",
+        "@types/d3-scale-chromatic": "*",
+        "@types/d3-selection": "*",
+        "@types/d3-shape": "*",
+        "@types/d3-time": "*",
+        "@types/d3-time-format": "*",
+        "@types/d3-timer": "*",
+        "@types/d3-transition": "*",
+        "@types/d3-zoom": "*"
+      }
+    },
+    "node_modules/@types/d3-array": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/@types/d3-array/-/d3-array-3.2.2.tgz",
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+    "node_modules/@types/d3-axis": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/@types/d3-axis/-/d3-axis-3.0.6.tgz",
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+    "node_modules/@types/d3-brush": {
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+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-selection": "*"
+      }
+    },
+    "node_modules/@types/d3-chord": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/@types/d3-chord/-/d3-chord-3.0.6.tgz",
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+    "node_modules/@types/d3-color": {
+      "version": "3.1.3",
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+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/geojson": "*"
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@@ -1241,6 +2250,47 @@
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+      "license": "MIT",
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@@ -1264,6 +2314,18 @@
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@@ -1319,6 +2381,24 @@
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@@ -1339,6 +2420,33 @@
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@@ -1405,6 +2513,12 @@
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@@ -1445,6 +2559,24 @@
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@@ -1570,6 +2707,15 @@
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@@ -1587,6 +2733,21 @@
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+      "license": "MIT",
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@@ -1606,6 +2767,19 @@
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+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.0.tgz",
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+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
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@@ -1681,6 +2855,55 @@
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diff --git a/package.json b/package.json
index cbdff41..b15f16c 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
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     "github-markdown-css": "^5.8.1",
     "marked": "^15.0.7",
+    "mermaid": "^11.13.0",
     "monaco-editor": "^0.52.2",
     "storehouse-js": "github:tanabe/Storehouse-js"
   }
diff --git a/public/css/style.css b/public/css/style.css
index e607c7b..57ff018 100644
--- a/public/css/style.css
+++ b/public/css/style.css
@@ -209,3 +209,42 @@ footer {
 [data-theme="dark"] footer {
   background-color: #333;
 }
+
+/* Mermaid diagram containers — match GitHub's centered rendering */
+.mermaid-container {
+  display: flex;
+  justify-content: center;
+  margin: 16px 0;
+  padding: 16px;
+  background-color: #f6f8fa;
+  border-radius: 6px;
+  overflow-x: auto;
+}
+
+.mermaid-container svg {
+  max-width: 100%;
+  height: auto;
+}
+
+.mermaid-error {
+  border: 1px solid #d1242f;
+}
+
+.mermaid-error pre {
+  color: #d1242f;
+  white-space: pre-wrap;
+  word-break: break-word;
+  margin: 0;
+}
+
+[data-theme="dark"] .mermaid-container {
+  background-color: #161b22;
+}
+
+[data-theme="dark"] .mermaid-error {
+  border-color: #f85149;
+}
+
+[data-theme="dark"] .mermaid-error pre {
+  color: #f85149;
+}
diff --git a/src/main.js b/src/main.js
index 64c180d..6756d4a 100644
--- a/src/main.js
+++ b/src/main.js
@@ -2,16 +2,39 @@ import Storehouse from 'storehouse-js';
 import * as monaco from 'https://cdn.jsdelivr.net/npm/monaco-editor@0.52.2/+esm';
 import { marked } from 'marked';
 import DOMPurify from 'dompurify';
+import mermaid from 'mermaid';
 
 const init = () => {
     let hasEdited = false;
     let scrollBarSync = false;
+    let mermaidIdCounter = 0;
 
     const localStorageNamespace = 'com.markdownlivepreview';
     const localStorageKey = 'last_state';
     const localStorageScrollBarKey = 'scroll_bar_settings';
     const localStorageThemeKey = 'theme_settings';
     const confirmationMessage = 'Are you sure you want to reset? Your changes will be lost.';
+
+    mermaid.initialize({
+        startOnLoad: false,
+        theme: 'default',
+        securityLevel: 'strict',
+    });
+
+    const mermaidExtension = {
+        renderer: {
+            code({ text, lang }) {
+                if (lang === 'mermaid') {
+                    const id = `mermaid-block-${mermaidIdCounter++}`;
+                    const escaped = text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
+                    return `<div class="mermaid-container"><pre class="mermaid-source" data-mermaid-id="${id}">${escaped}</pre></div>`;
+                }
+                return false;
+            }
+        }
+    };
+    marked.use(mermaidExtension);
+
     // default template
     const defaultInput = `# Markdown syntax guide
 
@@ -82,6 +105,16 @@ ${"`"}${"`"}${"`"}
 ## Inline code
 
 This web site is using ${"`"}markedjs/marked${"`"}.
+
+## Mermaid Diagrams
+
+${"`"}${"`"}${"`"}mermaid
+graph TD
+    A[Start] --> B{Is it working?}
+    B -->|Yes| C[Great!]
+    B -->|No| D[Debug]
+    D --> B
+${"`"}${"`"}${"`"}
 `;
 
     self.MonacoEnvironment = {
@@ -138,15 +171,42 @@ This web site is using ${"`"}markedjs/marked${"`"}.
         return editor;
     };
 
-    // Render markdown text as html
-    let convert = (markdown) => {
+    // Render markdown text as html, then render any mermaid diagrams
+    let convert = async (markdown) => {
+        mermaidIdCounter = 0;
         let options = {
             headerIds: false,
             mangle: false
         };
         let html = marked.parse(markdown, options);
-        let sanitized = DOMPurify.sanitize(html);
-        document.querySelector('#output').innerHTML = sanitized;
+        let sanitized = DOMPurify.sanitize(html, {
+            ADD_TAGS: ['pre', 'div'],
+            ADD_ATTR: ['data-mermaid-id', 'class'],
+        });
+        const output = document.querySelector('#output');
+        output.innerHTML = sanitized;
+
+        await renderMermaidBlocks(output);
+    };
+
+    let renderMermaidBlocks = async (container) => {
+        const blocks = container.querySelectorAll('.mermaid-source[data-mermaid-id]');
+        for (const block of blocks) {
+            const id = block.getAttribute('data-mermaid-id');
+            const source = block.textContent;
+            const wrapper = block.closest('.mermaid-container');
+            try {
+                const { svg } = await mermaid.render(id, source);
+                if (wrapper) {
+                    wrapper.innerHTML = svg;
+                    wrapper.classList.add('mermaid-rendered');
+                }
+            } catch {
+                if (wrapper) {
+                    wrapper.classList.add('mermaid-error');
+                }
+            }
+        }
     };
 
     // Reset input text
@@ -208,6 +268,14 @@ This web site is using ${"`"}markedjs/marked${"`"}.
         }
     };
 
+    let setMermaidTheme = (useDark) => {
+        mermaid.initialize({
+            startOnLoad: false,
+            theme: useDark ? 'dark' : 'default',
+            securityLevel: 'strict',
+        });
+    };
+
     // ----- theme toggle (dark/light) -----
     let setTheme = (enabled) => {
         document.documentElement.setAttribute('data-theme', enabled ? 'dark' : 'light');
@@ -218,6 +286,7 @@ This web site is using ${"`"}markedjs/marked${"`"}.
         if (!checkbox) return;
         checkbox.checked = settings;
         setTheme(settings);
+        setMermaidTheme(settings);
 
         // set Monaco editor theme to match page theme
         if (monaco && monaco.editor && typeof monaco.editor.setTheme === 'function') {
@@ -231,9 +300,14 @@ This web site is using ${"`"}markedjs/marked${"`"}.
             setTheme(checked);
             saveThemeSettings(checked);
             setPreviewCss(checked);
+            setMermaidTheme(checked);
             if (monaco && monaco.editor && typeof monaco.editor.setTheme === 'function') {
                 monaco.editor.setTheme(checked ? 'vs-dark' : 'vs');
             }
+            // Re-render mermaid diagrams with the new theme
+            if (editor) {
+                convert(editor.getValue());
+            }
         });
     };