init

index.js

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+'use strict';
+
+/* global hexo */
+
+const mermaid = require('./mermaid.js');
+
+hexo.config.mermaid = Object.assign({
+  mmdcPath: 'mmdc',
+  timeout: 5000,
+  theme: 'default',
+  width: 800,
+  height: 600,
+  format: 'svg',
+  background: 'white',
+  scale: 1
+},
+hexo.config.mermaid);
+
+hexo.extend.tag.register('mermaid', mermaid(hexo.config.mermaid), { ends = true });

lib/mermaid.js

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+'use strict';
+
+const { spawnSync } = require('node:child_process');
+
+function mermaid(config) {
+  return function(args, content) {
+    let options = Object.assign({}, config);
+    let caption = '';
+    for (const arg in args) {
+      const arr = arg.split(':');
+      if (arr.length == 1) {
+        caption = arr;
+      } else {
+        const { key, val } = arr;
+        options[key] = val;
+      }
+    }
+
+    const args = [
+      '-t', options.theme || 'default',
+      '-w', options.width || 800,
+      '-H', options.height || 600,
+      '-e', options.format || 'svg',
+      '-b', options.background || 'white',
+      '-s', options.scale || 1,
+      '-i', '-',
+      '-o', '-'
+    ];
+
+    const result = spawnSync(options.mmdcPath, args, {
+      cwd: process.cwd(),
+      env: process.env,
+      input: content,
+      encoding: 'utf8',
+      timeout: options.timeout
+    });
+
+    if (result.status === 0) {
+      if (result.stderr) {
+        console.warn(result.stderr);
+      }
+      const path = 'data:image/svg+xml;base64,' + Buffer.from(result.stdout).toString('base64');
+      
+      if (caption != '') {
+        return `<figure><img src="${ path }" alt="${ caption }"/><figcaption>${ caption }</figcaption></figure>`
+      } else {
+        return `<p><image src="${ path }"/></p>`;
+      }
+    }
+    if (result.error) {
+      throw result.error;
+    }
+    throw Error('mmdc exited with code ' + result.status + (result.stderr ? ': ' + result.stderr : '.'));
+  };
+}
+
+module.exports = mermaid;

package.json

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+{
+  "name": "hexo-tag-mermaid",
+  "version": "0.0.0",
+  "description": "add mermaid diagrams support for hexo.",
+  "homepage": "https://git.gzezfisher.top/FISHER_/hexo-tag-mermaid",
+  "bugs": {
+    "url": "https://git.gzezfisher.top/FISHER_/hexo-tag-mermaid/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://git.gzezfisher.top/FISHER_/hexo-tag-mermaid.git"
+  },
+  "main": "index.js",
+  "files": [
+    "lib"
+  ],
+  "contributers": [],
+  "tags": [
+    "hexo",
+    "plugin",
+    "mermaid"
+  ],
+  "dependencies": {}
+}