Render codefence by codemirror rather than by hljs

browser/lib/markdown.js

@@ -1,7 +1,6 @@
 import markdownit from 'markdown-it'
 import emoji from 'markdown-it-emoji'
 import math from '@rokt33r/markdown-it-math'
-import hljs from 'highlight.js'
 import _ from 'lodash'
 
 const katex = window.katex
@@ -10,9 +9,9 @@ function createGutter (str) {
   let lc = (str.match(/\n/g) || []).length
   let lines = []
   for (let i = 1; i <= lc; i++) {
-    lines.push('<span>' + i + '</span>')
+    lines.push('<span class="CodeMirror-linenumber">' + i + '</span>')
   }
-  return '<span class="lineNumber">' + lines.join('') + '</span>'
+  return '<span class="lineNumber CodeMirror-gutters">' + lines.join('') + '</span>'
 }
 
 var md = markdownit({
@@ -21,19 +20,10 @@ var md = markdownit({
   html: true,
   xhtmlOut: true,
   highlight: function (str, lang) {
-    if (lang && hljs.getLanguage(lang)) {
-      try {
-        return '<pre class="hljs">' +
-        createGutter(str) +
-        '<code>' +
-        hljs.highlight(lang, str).value +
-        '</code></pre>'
-      } catch (e) {}
-    }
-    return '<pre class="hljs">' +
+    return '<pre class="code">' +
     createGutter(str) +
-    '<code>' +
-    str.replace(/\&/g, '&amp;').replace(/\</g, '&lt;').replace(/\>/g, '&gt;').replace(/\"/g, '&quot;') +
+    '<code class="' + lang + '">' +
+    str +
     '</code></pre>'
   }
 })