Created price hook from a lineItem perspective

docs/dynamic-pricing.md

@@ -37,6 +37,20 @@ SimpleCommerce::productVariantPriceHook(function (Order $order, Product $product
 });
 ```
 
+Another alternative method is available to calculate from a lineItem perspective.
+
+```php
+use DuncanMcClean\SimpleCommerce\Orders\LineItem;
+
+SimpleCommerce::lineItemPriceHook(function (LineItem $lineItem) {
+    if ($lineItem->product()->get('sale')) {
+        return $lineItem->product()->get('price') * 0.9; // 10% discount
+    }
+
+    return $lineItem->product()->get('price');
+});
+```
+
 :::note Note!
 These methods will not make any change to the price displayed to customers or stored in your products. They're only used when 'calculating' line items (eg. when an item is added to the cart, quantity changed, etc).
 :::

src/Orders/Calculator/LineItemCalculator.php

@@ -41,6 +41,8 @@ public function handle(Order $order, Closure $next)
                 if ($product->purchasableType() === ProductType::Product) {
                     if (SimpleCommerce::$productPriceHook) {
                         $productPrice = (SimpleCommerce::$productPriceHook)($order, $product);
+                    } elseif (SimpleCommerce::$lineItemPriceHook) {
+                        $productPrice = (SimpleCommerce::$lineItemPriceHook)($lineItem);
                     } else {
                         $productPrice = $product->price();
                     }

src/SimpleCommerce.php

@@ -23,6 +23,8 @@ class SimpleCommerce
 
     public static $productVariantPriceHook;
 
+    public static $lineItemPriceHook;
+
     public static function version(): string
     {
         if (app()->environment('testing')) {
@@ -200,4 +202,11 @@ public static function productVariantPriceHook(Closure $callback): self
 
         return new static;
     }
+
+    public static function lineItemPriceHook(Closure $callback): self
+    {
+        static::$lineItemPriceHook = $callback;
+
+        return new static;
+    }
 }