GSGreenText/GSGreenTextPlugin.php

<?php

if (!defined('GNUSOCIAL')) {
    exit(1);
}

class GSGreenTextPlugin extends Plugin
{
    const VERSION = '0.0.1';

    public function onEndShowStyles(Action $action)
    {
        $action->style(".greentext { color: green; }");
    }

    public function onQvitterEndShowHeadElements(Action $action)
    {
    	$this->onEndShowStyles($action);
    }

    function onStartNoticeSave(&$notice)
    {
		$sepnotice = preg_split("/<br\s*?\/?>\r?\n*/", $notice->rendered, -1);

    	foreach($sepnotice as &$sep)
    	{
    		if(0 === strpos($sep, '&gt;'))
    		{
                $sep = "<span class='greentext'>" . $sep . "</span>";
    		}
    	}

    	$notice->rendered = implode("<br />" . PHP_EOL, $sepnotice);
    }

    function onPluginVersion(array &$versions)
    {
        $versions[] = array('name' => 'GreenText',
                            'version' => self::VERSION,
                            'author' => 'MoonMan',
                            'homepage' => 'https://gitgud.io/ShitposterClub/GSGreenText/',
                            'description' =>
                            _m('Starting line with ">" makes line green.'));
        return true;
    }
}