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Make Syntax Highlighting work in AMP-WP using GeSHi

4. March 2016

Again another Google AMP article, this time dealing with Syntax Highlighting. If you have a code centric website, this is important.

In one of my last articles I talked about a Generic Syntax Highlighter.   This time I want to show you, how to add Syntax Highlighting with GeSHi to a custom template in AMP-WP.


Please read up on documentation, as I am not diving into every detail.

  1. AMP-WP – github.com/Automattic/amp-wp / Documentation
    The WordPress AMP integration. We will be using a custom template for our AMP pages.
  2. Crayon Syntax Highlighter github.com/aramk/crayon-syntax-highlighter
    I am using this for Syntax Highlighting on none AMP pages. It adds specific language classes to the code / pre areas, that I am using to configure GeSHi.
  3. GeSHi – github.com/GeSHi/geshi-1.0
    The Syntax Highlighter
  4. phpQuery – github.com/punkave/phpQuery
    DOM Document transversal & modification simplified. You should be able to apply the things below to any other tool you want to use for that.
  5. My tweaks on GitHub


  1. Upload GeSHi and phpQuery to your desired location on your webserver.
  2. Call the custom template for AMP-WP in your functions.php

    I have an example stored on GitHub
  3. Create a custom template in your themes folder.We could use the following filters, but its easier to use the custom template, due to the GeSHi style setup. The problem is, that the style action is called before the content action within the template. But I am planning to build a TWIG template for myself, as I am running Timber everywhere. That will detach logic and content completely, allow to rethink some of these things and make styling a lot easier 🙂 So watch out for my next article!

    Add this to the top of your custom template:

    I have an example stored on GitHub. The above works, if you are using Crayon Syntax Highlighter for standard pages.
    If you use something else, this needs to be changed.
  4. Add the GeSHi styles to the amp-custom style tag

    I have an example stored on GitHub.
  5. Output updated amp-wp-content

    I have an example stored on GitHub.
  6. Save and check that your AMP page validates, by adding #development=1 to the end of the url. Check the console for errors.
    Show this page as AMP

Enjoy coding …

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