grettke

Out of the box, <a href="https://wordpress.org/extend/plugins/wp-syntax/" rel="ugc">WP-Syntax</a> 
colors code using the default <a href="http://qbnz.com/highlighter/" rel="nofollow ugc">GeSHi</a> colors. 
Per the authors advice in the ‘Advanced Customization’ section of 
<a href="https://wordpress.org/extend/plugins/wp-syntax/other_notes/" rel="ugc">Other Notes</a>, 
you can configure GeSHi yourself by handling the <code>wp_syntax_init_geshi</code> 
hook and configuring it programmatically.
Since I wanted to do just that, I decided to publish a generic plugin 
for folks who wanted to configure GeSHi following this approach.
<h3>Release Notes</h3>
1.2 : Set keyword expansion in the plugin file. Uses Wp-Syntax 0.9, which depends on GeSHi 1.0.7.22.
1.1 : Fixed grammatical errors in the readme.txt. Uses Wp-Syntax 0.9, which depends on GeSHi 1.0.7.22.
1.0 : First public release. Uses Wp-Syntax 0.9, which depends on GeSHi 1.0.7.22.

wp-syntax-rettke

wp-syntax-rettke serves as an example for the programmatic 
"Advanced Configuration" of GeSHi in Ryan McGeary's excellent WP-Syntax plu …

Alvaro

<a href="https://gutenberg-showcase.melonpan.io/melonpan-block-code" rel="nofollow ugc">Demo</a> – <a href="https://melonpan.io/wordpress-plugins/melonpan-block-code" rel="nofollow ugc">Documentation</a> – <a href="https://github.com/garciaalvaro/melonpan-block-code" rel="nofollow ugc">GitHub</a>
Block to display code, with highlighted syntax, which can be copied to the clipboard.
<h3>Features</h3>
The block comes with the following settings:
<ul>
<li>Code language: JavaScript, CSS, PHP, etc. <a href="https://prismjs.com/#languages-list" rel="nofollow ugc">Full list of languages</a>.</li>
<li>Color theme</li>
<li>Label: Top left label that can be customized. By default the code language.</li>
<li>Copy button: Top right button to copy the block content.</li>
<li>Padding</li>
<li>Border width and Border radius</li>
</ul>
<h3>Usage</h3>
The block can be found inside the blocks inserter menu under the Melonpan Blocks category. 
Once added in the post you can edit its settings on the Editor sidebar under the Block settings panel. 
Switch between the previewer and editor views to edit the code and see its styled output.

Melonpan Block – Code

Block to display code, with highlighted syntax, which can be copied to the clipboard.

wp-syntax-rettke vs Melonpan Block – Code