feat: add cart:make:shipping command

src/Commands/MakeShippingCommand.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Wearepixel\Cart\Commands;
+
+use Illuminate\Console\Command;
+
+class MakeShippingCommand extends Command
+{
+    protected $signature = 'cart:make:shipping {name : The class name of the shipping rate}';
+
+    protected $description = 'Create a new ShippingRate class in app/Cart/Shipping.';
+
+    public function handle(): int
+    {
+        $name = $this->argument('name');
+        $directory = app_path('Cart/Shipping');
+        $path = "{$directory}/{$name}.php";
+
+        if (file_exists($path)) {
+            $this->error("Shipping rate already exists: app/Cart/Shipping/{$name}.php");
+            return self::FAILURE;
+        }
+
+        if (! is_dir($directory)) {
+            mkdir($directory, 0755, true);
+        }
+
+        file_put_contents($path, static::stub($name));
+        $this->info("Shipping rate created: app/Cart/Shipping/{$name}.php");
+
+        return self::SUCCESS;
+    }
+
+    public static function stub(string $className): string
+    {
+        return <<<PHP
+<?php
+
+declare(strict_types=1);
+
+namespace App\Cart\Shipping;
+
+use Wearepixel\Cart\Shipping\ShippingRate;
+
+class {$className} extends ShippingRate
+{
+    protected string \$name = 'Standard Shipping';
+
+    protected string \$value = '+10';
+
+    protected string \$target = 'total';
+
+    public function isApplicable(): bool
+    {
+        return true;
+    }
+}
+PHP;
+    }
+}