fix language aliases and demo building

README.md

@@ -80,7 +80,8 @@ The table below shows the full list of supported languages (and corresponding cl
 | BNF                     | bnf                    |         |
 | Brainfuck               | brainfuck, bf          |         |
 | C#                      | csharp, cs             |         |
-| C++                     | cpp, c, cc, h, c++, h++, hpp |   |
+| C                       | h                      |         |
+| C++                     | cpp, hpp, cc, hh, c++, h++, cxx, hxx |   |
 | C/AL                    | cal                    |         |
 | Cache Object Script     | cos, cls               |         |
 | CMake                   | cmake, cmake.in        |         |

src/languages/c.js

@@ -15,6 +15,7 @@ function(hljs) {
   // See further comments in c-like.js.
 
   // lang.disableAutodetect = false;
+  lang.aliases = ['c', 'h'];
   return lang;
 
 }

src/languages/cpp.js

@@ -10,6 +10,6 @@ function(hljs) {
   var lang = hljs.getLanguage('c-like').rawDefinition();
   // return auto-detection back on
   lang.disableAutodetect = false;
+  lang.aliases = ['cc', 'c++', 'h++', 'hpp', 'hh', 'hxx', 'cxx'];
   return lang;
-
 }

tools/tasks.js

@@ -212,7 +212,7 @@ tasks.readSnippet = function(options, blob, done) {
       snippetName = path.join('test', 'detect', name, 'default.txt');
 
   function onRead(error, blob) {
-    if(error) return done(error); // ignore missing snippets
+    if(error) return done(null); // ignore missing snippets
 
     let meta = { name: `${name}.js`, fileInfo: fileInfo };