Markdown内のコードにSyntax highlightenをいれる

lib/markdown.js

@@ -1,8 +1,22 @@
 import markdownit from 'markdown-it'
+import hljs from 'highlight.js'
 
 var md = markdownit({
   typographer: true,
-  linkify: true
+  linkify: true,
+  highlight: function (str, lang) {
+    if (lang && hljs.getLanguage(lang)) {
+      try {
+        return hljs.highlight(lang, str).value;
+      } catch (__) {}
+    }
+
+    try {
+      return hljs.highlightAuto(str).value;
+    } catch (__) {}
+
+    return ''; // use external default escaping
+  }
 })
 
 export default function markdown (content) {