How can I turn off auto language detection in highlight.js and render all blocks?

Question

I use redcarpet2 markdown in my site hosted by Github pages. I switch the syntax highlighter from pygments to highlight.js.

I specified the language for each code block by

```r
(some r code)
```

So I don't need the auto language detection by highlight.js, actually if I don't specify the language it will always mis-recognize my R code to php or perl code.

The problem is: the HTML tag for <code> is somehow mixed.

Without rendering, the markdown correctly translate the code block with <code class="r language-r" data-lang="r"></code> which should be rendered as R code. But when I load highlight.js and run <script>hljs.initHighlightingOnLoad();</script>, the auto detect also works and makes the code tags mixed like <code class="r language-r hljs php" data-lang="r"></code> where php should be eliminated.

How can I fix the problem?

Answer 1

Probably your highlight.pack.js does not include R language, you can download it here just tick the appropriate checkboxes. When HighlightJS sees unknown class for code tag it tries to guess automatically right language.