This is a example of a "Drafts" plugin for Pico. Pico is a stupidly simple, blazing fast, flat file CMS. http://picocms.org/

PicoDrafts.php

<?php

/**
 * Pico Drafts Plugin (example)
 *
 * This is a example of a "Drafts" plugin for Pico's documentation.
 * Pico is a stupidly simple, blazing fast, flat file CMS.
 *
 * This example plugin basically just removes all pages starting with a `_`
 * from Pico's page list. The page will not show up anywhere, however, you
 * can still access it by manually navigating to the corresponding URL.
 *
 * @author  Daniel Rudolf
 * @link    http://picocms.org
 * @license http://opensource.org/licenses/MIT The MIT License
 */
class PicoDrafts extends AbstractPicoPlugin
{
    public function onPagesLoaded(array &$pages)
    {
        foreach ($pages as $pageId => $pageData) {
            $fileName = basename($pageData['id']);
            if ($fileName[0] === '_') {
                unset($pages[$pageId]);
            }
        }
    }
}