For some time now I am maintaining WP-GeSHi-Highlight, a code syntax highlighting plugin for WordPress, based on the established PHP highlighting library GeSHi.

The plugin has a very basic feature set, and I have never really promoted it — still, I was wondering how popular it is. I mean, it just works, reliably, and therefore it is a quite appropriate choice for many types of WordPress sites.

I came across NerdyData, a search engine for website source code:

We index the HTML, Javascript, CSS, and plaintext of hundreds of millions of pages.

Honestly, their web interface makes a pretty crappy impression. Nevertheless, It found about 140 websites that include the term “wp-geshi-highlight” in their source: https://search.nerdydata.com/search/#!/searchTerm=wp-geshi-highlight/searchPage=1/sort=pop

This is a short list of some web pages using WP-GeSHi-Highlight, found via NerdyData:

• vis4.net — for example: this post
• hashbang.ca — for example: this post (the author of the hashbang WordPress theme included WP-GeSHi-Highlight: https://github.com/doherty/Hashbang-wp-theme)
• itblog.su — for example this page
• sqlperformance.com — for example this post
• avav.byethost5.com — for example this post
• littleprojects.org — for example this post
• ku10.com — for example this post
• roth-soft.de — for example this post

When seeing this, I found interesting that many make use of the simple customization and deviate from the default styling of WP-GeSHi-Highlight code blocks.