How to use highlight.js outside the browser?

I’m considering pre-highlighting code on the server-side to avoid making users download the highlight.js library, but I’m not exactly sure how to do it.

Say I have a README file in Markdown, and I use marked to parse it into HTML:

require("marked").parse(require("fs").readFileSync("./README.md").toString())

Now I have this HTML:

<h1 id="jiggle">jiggle</h1>
<p>Jiggle arrays to slightly rearrange their values</p>
<h2 id="installation">Installation</h2>
<pre><code class="lang-sh">npm install jiggle --save
</code></pre>
<h2 id="usage">Usage</h2>
<pre><code class="lang-js">var jiggle = require(&quot;jiggle&quot;)

// The jiggle() function takes an array as input and returns an array
jiggle([0,1,2,3,4,5,6,7,8,9])
// [ 1, 2, 0, 4, 3, 5, 6, 7, 9, 8 ]

// It can also jiggle strings
jiggle(&quot;jabberwocky&quot;)
// jbbeawockyr

// It always returns a new object without altering the original
var orig = [&quot;a&quot;,&quot;b&quot;,&quot;c&quot;,&quot;d&quot;,&quot;e&quot;,&quot;f&quot;]
var dupe = jiggle(orig)
// orig: [&#39;a&#39;,&#39;b&#39;,&#39;c&#39;,&#39;d&#39;,&#39;e&#39;,&#39;f&#39;]
// dupe: [&#39;a&#39;,&#39;b&#39;,&#39;d&#39;,&#39;e&#39;,&#39;c&#39;,&#39;f&#39;]

// And if you like jiggling you can keep on doing it
jiggle(jiggle(jiggle(&quot;supercalifragilisticexpialidocious&quot;)))
// supcaerligralitiiscpefaldioxciosiu
</code></pre>
<h2 id="tests">Tests</h2>
<pre><code class="lang-sh">npm install
npm test
</code></pre>

How would I use highlight.js to apply syntax highlighting markup to this HTML string? Please forgive me if I missed the documentation somewhere that explains this. 😃

[sourrust]

There is documentation in marked for this. The example only uses auto highlighting when it is possible to specify a language like the Pygments example.

var fs     = require('fs');
var hljs   = require('highlight.js');
var marked = require('marked');

var markdownString = fs.readFileSync('./README.md');

marked.setOptions({
  highlight: function(code, lang) {
    return hljs.highlight(lang, code).value;
  }
});

var output = marked(markdownString);

[xcatliu]

Give a compatible version:

marked.setOptions({
  highlight: function(code, lang) {
    if (typeof lang === 'undefined') {
      return hljs.highlightAuto(code).value;
    } else if (lang === 'nohighlight') {
      return code;
    } else {
      return hljs.highlight(lang, code).value;
    }
  }
});