Kirby Snippet Assets Plugin

index.php

<?php

use Kirby\Cms\App;
use Kirby\Toolkit\A;

App::plugin('lukaskleinschmidt/snippet-assets', [
    'hooks' => [
        'page.render:after' => function (string $contentType, string $html) {
            if ($contentType === 'html') {
                $html = preg_replace_callback('/<\/head>/', fn ($matches) =>
                    SnippetAssets::styles() . SnippetAssets::scripts() . $matches[0]
                , $html);
            }

            return $html;
        },
    ],
    'components' => [
        'snippet' => function (App $kirby, $name, array $data = [], bool $slots = false) {
            SnippetAssets::for($name);

            return $kirby->core()->components()['snippet'](
                $kirby,
                $name,
                $data,
                $slots,
            );
        }
    ],
]);

class SnippetAssets
{
    /**
     * The snippet styles.
     */
    public static $styles = [];

    /**
     * The snippet scripts.
     */
    public static $scripts = [];

    /**
     * Resolve snippet assets.
     */
    public static function for(string|array $name): void
    {
        if ($name = static::name($name)) {
            static::script($name);
            static::style($name);
        }
    }

    /**
     * Get the snippet name.
     */
    public static function name(string|array $name): ?string
    {
        $kirby = App::instance();
        $names = A::wrap($name);
        $root = $kirby->root('snippets');

        foreach ($names as $name) {
            $file = $root . '/' . $name . '.php';

            if (file_exists($file) === false) {
                $file = $kirby->extensions('snippets')[$name] ?? null;
            }

            if ($file) {
                return $name;
            }
        }

        return null;
    }

    /**
     * Add a snippet script.
     */
    public static function script(string $name): void
    {
        if (isset(static::$scripts[$name])) {
            return;
        }

        $script = asset('assets/snippets/' . $name . '.js');

        if ($script->exists()) {
            static::$scripts[$name] = js($script);
        }
    }

    /**
     * Get all snippet scrtips.
     */
    public static function scripts(): string
    {
        return implode(PHP_EOL, static::$scripts);
    }

    /**
     * Add a snippet style.
     */
    public static function style(string $name): void
    {
        if (isset(static::$styles[$name])) {
            return;
        }

        $style = asset('assets/snippets/' . $name . '.css');

        if ($style->exists()) {
            static::$styles[$name] = css($style);
        }
    }

    /**
     * Get all snippet styles.
     */
    public static function styles(): string
    {
        return implode(PHP_EOL, static::$styles);
    }
}