Add Image Resizing to Jigsaw

boostrap.php

<?php

use App\Listeners\ResizeImageListener;

/** @var $container \Illuminate\Container\Container */
/** @var $events \TightenCo\Jigsaw\Events\EventBus */

/**
 * A beforeBuild event is fired before any source files have been processed.
 * This gives you an opportunity to programmatically modify config.php variables,
 * fetch data from external sources, or modify files in the source folder.
 */
$events->beforeBuild([
    ResizeImageListener::class,
]);

composer.json

{
    "require": {
        "tightenco/jigsaw": "^1.2",
        "intervention/image": "^2.4"
    },
    "autoload": {
        "psr-4": {
            "App\\": "app"
        }
    }
}

index.blade.php

@extends("_layouts.master")

@section("content")
    {{ $page->resizeImage('/assets/images/image.png', ['w' => 100, 'h' => 100, 'dpr' => 2, 'q' => 75]) }}
    {{-- Will output: /assets/images/[email protected] --}}
@endsection

ResizeImageListener.php

<?php

namespace App\Listeners;

use TightenCo\Jigsaw\Jigsaw;
use App\Utilities\ResizeImageUtility;

class ResizeImageListener
{
    public function handle(Jigsaw $jigsaw)
    {
        $jigsaw->setConfig('resizeImage', new ResizeImageUtility($jigsaw));
    }
}

ResizeImageUtility.php

<?php

namespace App\Utilities;

use TightenCo\Jigsaw\Jigsaw;
use TightenCo\Jigsaw\PageVariable;
use Intervention\Image\ImageManagerStatic as Image;

class ResizeImageUtility
{
    protected $jigsaw;

    public function __construct(Jigsaw $jigsaw)
    {
        $this->jigsaw = $jigsaw;
    }

    public function __invoke(PageVariable $page, string $path, array $manipulations)
    {
        // Get manipulations
        $width = array_get($manipulations, 'w');
        $height = array_get($manipulations, 'h');
        $dpr = array_get($manipulations, 'dpr');
        $quality = array_get($manipulations, 'q');

        // Image information
        $imageSourcePath = $this->jigsaw->getSourcePath() . $path;
        $imageSourceInfo = pathinfo($imageSourcePath);

        // Build manipulated image filename
        $imageFilename = collect([
            $imageSourceInfo['filename'],
            "{$width}x{$height}",
            $quality,
        ])->filter()->implode('-');
        $dprSuffix = $dpr ? '@' . $dpr . 'x' : '';
        $imageFile = $imageFilename . $dprSuffix . '.' . $imageSourceInfo['extension'];

        // Make new Intervention Image instance
        $image = Image::make($imageSourcePath);

        // Resize image based on width and/or height
        if ($width || $height) {
            $image->resize($width, $height, function ($constraint) use ($width, $height) {
                if (!$width || !$height) {
                    $constraint->aspectRatio();
                }
            });
        }

        // Widen image based on device pixel resolution
        if ($dpr) {
            $image->widen($image->width() * (int) $dpr);
        }

        // Get encoded string of manipulated image instance
        $contents = (string) $image->encode(null, $quality);

        // Get manipulated image path
        $imagePath = pathinfo($path, PATHINFO_DIRNAME) . '/' . $imageFile;

        // Get manipulated image relative build path
        $imageBuildPath = basename($this->jigsaw->getDestinationPath()) . $imagePath;

        // Save manipulated image to build output
        $this->jigsaw->getFilesystem()->putWithDirectories($imageBuildPath, $contents);

        // Return manipulated image path
        return $imagePath;
    }
}