Added syntax highlight support for fenced blocks

README.md

@@ -33,12 +33,13 @@ Usage
 -----
 
 ```javascript
-var Remarkable = require('remarkable')();
+var Remarkable = require('remarkable');
 var md = new Remarkable({
   html: false,
   xhtml: false,
   breaks: true,
-  langprefix: 'language-'
+  langprefix: 'language-',
+  highlight: function (str, lang) { return str; }
 });
 
 console.log(md.parse('# Remarkable rulezz!'));
@@ -55,7 +56,8 @@ md.set({
   html: false,
   xhtml: false,
   breaks: true,
-  langprefix: 'language-'
+  langprefix: 'language-',
+  highlight: function (str, lang) { return str; }
 });
 ```
 

demo/assets/index.js

@@ -14,6 +14,22 @@
     _src: false
   };
 
+  defaults.highlight = function (str, lang) {
+    if (!defaults._highlight) { return ''; }
+
+    var hljs = window.hljs;
+    if (lang && hljs.getLanguage(lang)) {
+      try {
+        //console.log(lang, hljs.highlight(lang, str));
+        return hljs.highlight(lang, str).value;
+      } catch (__) {}
+    }
+
+    try { return hljs.highlightAuto(str).value; } catch (__) {}
+
+    return '';
+  };
+
   function mdInit() {
     mdHtml = new window.Remarkable(defaults);
     mdSrc = new window.Remarkable(defaults);

lib/defaults.js

@@ -7,5 +7,6 @@ module.exports = {
   html: false,
   xhtml: false,
   breaks: false,
-  langprefix: 'language-'
+  langprefix: 'language-',
+  highlight: function (/*str*/) { return ''; }
 };

lib/lexer_inline.js

@@ -18,8 +18,6 @@ rules.push(require('./lexer_inline/text'));
 rules.push(require('./lexer_inline/newline'));
 rules.push(require('./lexer_inline/escape'));
 rules.push(require('./lexer_inline/backticks'));
-//
-//
 rules.push(require('./lexer_inline/emphasis'));
 rules.push(require('./lexer_inline/links'));
 rules.push(require('./lexer_inline/autolink'));

lib/renderer.js

@@ -53,17 +53,21 @@ rules.code = function (tokens, idx /*, options*/) {
 
 rules.fence = function (tokens, idx, options) {
   var token = tokens[idx];
-  var langMark = '';
+  var langClass = '';
   var langPrefix = options.langprefix || '';
-  var params;
+  var params, langName = '';
+  var highlighted;
 
   if (token.params) {
     params = token.params.split(/ +/g);
-    langMark = ' class="' + langPrefix + escapeHtml(replaceEntities(unescapeMd(params[0]))) + '"';
+    langName = escapeHtml(replaceEntities(unescapeMd(params[0])));
+    langClass = ' class="' + langPrefix + langName + '"';
   }
 
-  return  '<pre><code' + langMark + '>'
+  highlighted = options.highlight(token.content, langName) || escapeHtml(token.content);
-        + escapeHtml(token.content)
+
+  return  '<pre><code' + langClass + '>'
+        + highlighted
         + '</code></pre>' + getBreak(tokens, idx);
 };