Kirby plugin priority

App.php

<?php

namespace App\Foundation;

use Kirby\Cms\App as BaseApp;

class App extends BaseApp
{
    /**
     * Custom plugin priority
     */
    protected static array $pluginPriority = [
        //
    ];

    /**
     * Loads all plugins from site/plugins
     */
    protected function pluginsLoader(): array
    {
        $loaded = parent::pluginsLoader();

        static::$plugins = (new Plugins(
            static::$pluginPriority,
            static::$plugins,
        ))->data();

        return $loaded;
    }
}

Plugins.php

<?php

namespace App\Foundation;

use Kirby\Cms\Plugin;
use Kirby\Toolkit\Collection;

class Plugins extends Collection
{
    /**
     * Constructor
     */
    public function __construct(array $priority, array $plugins)
    {
        $this->data = $this->sortPlugins($priority, $plugins);
    }

    /**
     * Sort the plugins by the given priority
     */
    protected function sortPlugins(array $priority, array $plugins): array
    {   
        $prevIndex = 0;
        $index = 0;

        foreach ($plugins as $name => $plugin) {
            $priorityIndex = $this->priorityIndex($priority, $name);

            if (! is_null($priorityIndex)) {
                if (isset($prevPriorityIndex) && $priorityIndex < $prevPriorityIndex) {
                    return $this->sortPlugins(
                        $priority, $this->movePlugin($plugins, $plugin, $prevIndex)
                    );
                }

                $prevPriorityIndex = $priorityIndex;
                $prevIndex = $index;
            }

            $index++;
        }

        return $plugins;
    }

    /**
     * Calculate the priority index of the plugin
     */
    protected function priorityIndex($priority, $name): ?int
    {
        $index = array_search($name, $priority);

        if ($index !== false) {
            return $index;
        }

        return null;
    }

    /**
     * Move the plugin to the index while preserving the keys
     */
    protected function movePlugin(array $plugins, Plugin $plugin, int $index): array
    {
        return array_slice($plugins, 0, $index, true)
            + [$plugin->name() => $plugin]
            + array_slice($plugins, $index, null, true);
    }
}