flatpress-plugin-syntaxhighlighter-ng/plugin.syntaxhighlighter.php

<?php
/*
Plugin Name: SyntaxHighlighter-NG
Version: 1.0.1
Plugin URI: https://git.la10cy.net/DeltaLima/flatpress-plugin-syntaxhighlighter-ng
Description: <a href="https://git.la10cy.net/DeltaLima/flatpress-plugin-syntaxhighlighter-ng/">SyntaxHighlighter-NG</a> (forked from <a href="https://forum.flatpress.org/viewtopic.php?p=1130&hilit=syntax+highlight#p1135">Arvid's forum post</a>, using now <a href="https://prismjs.com">prism.js</a>)
Author: 2005 NoWhereMan, 2023 DeltaLima
Author URI: https://deltalima.org
*/


function plugin_syntaxhighlighter_add($lang=null) {
	static $languages = array();
	
	$pdir=plugin_geturl('syntaxhighlighter');

    // create array containing the used languages
		$languages[] = "{$lang}";
    // remove unique
		$languages = array_unique($languages);
		
  return $languages;

}


function plugin_syntaxhighlighter_head() {
	$pdir=plugin_geturl('syntaxhighlighter');
echo <<<PRISMJS
	<!-- start of prism.js header -->
		
  <link rel="stylesheet" type="text/css" href="{$pdir}res/prism.okaidia.css" />

	<!-- end of prism.js header -->
PRISMJS;
	
}

add_action('wp_head', 'plugin_syntaxhighlighter_head');


function plugin_syntaxhighlighter_foot() {

  // convert the returned array into a json one, to have an easier time
  // giving it to the javascript below
  $used_languages = json_encode(plugin_syntaxhighlighter_add());
  
  $pdir=plugin_geturl('syntaxhighlighter');
  // javascript part
  echo <<<PRISMBOX
    <!-- start of prism.js footer -->
    
    <script type="text/javascript" src="{$pdir}res/prism.full.js"></script>
    
    <!-- include wrapping-function to wrap content of pre html-tags into code-tags, as said in https://prismjs.com/index.html#basic-usage -->
    <script type="text/javascript" src="{$pdir}res/syntaxhighlighter-ng.js"></script>

    <!-- call wrap_pre_tags() from syntaxhighlighter-ng.js -->
    <script type="text/javascript">
      var used_languages = $used_languages;
      wrap_pre_tags(used_languages);
    </script>
	
	<!-- end of prism.js footer -->
PRISMBOX;
}

add_action('wp_footer', 'plugin_syntaxhighlighter_foot');

?>