fix bugs

lib/mermaid.js

@@ -1,11 +1,13 @@
 'use strict';
 
+const fs = require('fs');
+const tmp = require('tmp');
 const { spawnSync } = require('node:child_process');
 
 function mermaid(config) {
   return function(args, content) {
     let options = Object.assign({}, config);
-    let caption = '';
+    let caption = '', configPath = '';
     args.forEach(arg => {
       const arr = arg.split(':');
       if (arr.length == 1) {
@@ -16,7 +18,7 @@ function mermaid(config) {
       }
     });
 
-    const mmdcArgs = [
+    let mmdcArgs = [
       '-t', options.theme,
       '-w', options.width,
       '-H', options.height,
@@ -27,6 +29,19 @@ function mermaid(config) {
       '-o', '-'
     ];
 
+    const arr = content.split('<!-- endconfig -->');
+    if (arr.length == 2) {
+      const mmdConfig = arr[0];
+      content = arr[1];
+      
+      const tmpFile = tmp.fileSync();
+      configPath = tmpFile.name;
+      fs.writeFileSync(configPath, mmdConfig);
+    }
+    if (configPath !== '') {
+      mmdcArgs.push('-c', configPath);
+    }
+
     const result = spawnSync(options.mmdcPath, mmdcArgs, {
       cwd: process.cwd(),
       env: process.env,