PostInstall.php

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<?php
namespace Elgg\Composer;

use Composer\Script\Event;
use Elgg;
use Elgg\Filesystem\Directory;

class PostInstall {
    public static function execute(Event $event) {
        self::copyFromElggToRoot("install/config/htaccess.dist", ".htaccess");
        self::copyFromElggToRoot("index.php", "index.php");
        self::copyFromElggToRoot("install.php", "install.php");
        self::copyFromElggToRoot("upgrade.php", "upgrade.php");

        $managed_plugins = [
            'aalborg_theme',
            'blog',
            'bookmarks',
            'ckeditor',
            'custom_index',
            'dashboard',
            'developers',
            'diagnostics',
            'discussions',
            'embed',
            'externalpages',
            'file',
            'garbagecollector',
            'groups',
            'htmlawed',
            'invitefriends',
            'legacy_urls',
            'likes',
            'logbrowser',
            'logrotate',
            'members',
            'messageboard',
            'messages',
            'notifications',
            'pages',
            'profile',
            'reportedcontent',
            'search',
            'site_notifications',
            'tagcloud',
            'thewire',
            'twitter_api',
            'uservalidationbyemail',
            'web_services',
        ];

        foreach ($managed_plugins as $plugin) {
            self::symlinkPluginFromRootToElgg($plugin);
        }
    }

    private static function copyFromElggToRoot($elggPath, $rootPath, $overwrite = false) {
        $from = Elgg\Application::elggDir()->getPath($elggPath);
        $to = Directory\Local::root()->getPath($rootPath);

        if (!$overwrite && file_exists($to)) {
            return false;
        }

        return copy($from, $to);
    }

    private static function symlinkPluginFromRootToElgg($plugin) {
        $from = Directory\Local::root()->getPath("mod/$plugin");
        $to = Elgg\Application::elggDir()->getPath("mod/$plugin");

        return !file_exists($from) && symlink($to, $from);
    }
}