MediaWiki Extension SyntaxHighlight
External
Internal
Installation
Download from https://www.mediawiki.org/wiki/Special:ExtensionDistributor/SyntaxHighlight_GeSHi
Expand in /var/www/<mediawiki-dir>/extensions:
tar -xzf SyntaxHighlight_GeSHi-REL1_35-6bd7a93.tar.gz -C /var/www/mediawiki-1.35.0/extensions
Add the following line at the bottom of LocalSettings.php
wfLoadExtension( 'SyntaxHighlight_GeSHi' );
Set execute permissions for the pygmentize binary:
chmod a+x /var/www/<mediawiki-dir>/extensions/SyntaxHighlight_GeSHi/pygments/pygmentize
⚠️ Install Python 3 (python3 must be available in PATH):
Restart httpd:
systemctl restart httpd
Installation Verification
Navigate to Special pages → Version and ensure the extension was installed.
Configuration
Reduce Font Size
Look up page MediaWiki:Common.css, or create if it does not exist, and append the following sequence:
/* CSS placed here will be applied to all skins */
.mw-highlight pre {
font-size: 90%;
}
Troubleshooting
While installing SyntaxHighlight on a particular MediaWiki instance, "Category: Pages with syntax highlighting errors" kept showing up and the extension did not seem to work.
The issue seemed to be related to SELinux configuration and went away after executing one of the following (more research required):
semanage permissive -a httpd_t # disable SELinux for httpd only
or:
semanage fcontext -a -t httpd_sys_script_exec_t '/var/www/mediawiki-1.35.0/extensions/SyntaxHighlight_GeSHi/pygments(/.*)?'
restorecon -R -v /var/www/mediawiki-1.35.0/extensions/SyntaxHighlight_GeSHi/pygments
Also see for further research:
There was another time when I re-installed SyntaxHighlight from the latest downloaded version and the problem went away.