Add some new resources and examples

composer.json

@@ -49,6 +49,9 @@
     "autoload-dev": {
         "psr-4": {
             "Thunk\\Verbs\\Tests\\": "tests/",
+            "Thunk\\Verbs\\Examples\\Cart\\": "examples/Cart/src/",
+            "Thunk\\Verbs\\Examples\\Cart\\Tests\\": "examples/Cart/tests/",
+            "Thunk\\Verbs\\Examples\\Cart\\Database\\Factories\\": "examples/Cart/database/factories/",
             "Thunk\\Verbs\\Examples\\Counter\\": "examples/Counter/src/",
             "Thunk\\Verbs\\Examples\\Counter\\Tests\\": "examples/Counter/tests/",
             "Thunk\\Verbs\\Examples\\Counter\\Database\\Factories\\": "examples/Counter/database/factories/",

docs/articles.md

@@ -0,0 +1,6 @@
+This is a collection of articles and blog posts that have been published about Verbs. If you have written something
+about Verbs, feel free to [submit a PR](https://github.com/hirethunk/verbs/blob/main/docs/articles.md) to add it
+to the list.
+
+- [Models in Verbs](https://cmorrell.com/models-in-verbs) (Chris Morrell - 2024)
+- [Verbs Validation Errors](https://cmorrell.com/verbs-errors) (Chris Morrell - 2024)

docs/navigation.json

@@ -41,10 +41,32 @@
             }
         ]
     },
+    {
+        "title": "Resources",
+        "slug": "resources",
+        "items": [
+            {
+                "title": "Videos",
+                "slug": "videos",
+                "icon": "tv"
+            },
+            {
+                "title": "Articles",
+                "slug": "articles",
+                "icon": "newspaper"
+            }
+        ]
+    },
     {
         "title": "Examples",
         "slug": "examples",
         "items": [
+            {
+                "title": "Shopping Cart",
+                "slug": "cart",
+                "icon": "shopping-cart",
+                "url": "/examples/cart"
+            },
             {
                 "title": "Board Game",
                 "slug": "monopoly",
@@ -105,26 +127,5 @@
                 "icon": "circle-stack"
             }
         ]
-    },
-    {
-        "title": "Packages",
-        "slug": "verbs-packages",
-        "items": [
-            {
-                "title": "Verbs Commands",
-                "slug": "verbs-commands",
-                "icon": "window"
-            },
-            {
-                "title": "Verbs History",
-                "slug": "verbs-history",
-                "icon": "book-open"
-            },
-            {
-                "title": "Verbs Livewire",
-                "slug": "verbs-livewire",
-                "icon": "bolt"
-            }
-        ]
     }
 ]

docs/videos.md

@@ -0,0 +1,12 @@
+> [!note]
+> These videos are relatively off-the-cuff and are using Verbs pre-releases. Some features
+> may change, or best practices may emerge prior to version 1.0 that will make these videos
+> obsolete. Once Verbs 1.0 is released, we plan on publishing a full, produced video series
+> on Verbs.
+
+-------
+
+Chris has posted a couple of introductory videos to YouTube. You can watch the playlist
+below, or [view it on YouTube](https://www.youtube.com/playlist?list=PLfp8k2-5wAK5Knn7HT43k1MJca08q_1nP).
+
+https://youtube.com/playlist?list=PLfp8k2-5wAK5Knn7HT43k1MJca08q_1nP&si=8wbEtU4Sz6Qp3A5_

examples/Cart/README.md

@@ -0,0 +1,4 @@
+# Shopping Cart Example
+
+This example is the code written in Chris's [Using state in Verbs](https://www.youtube.com/watch?v=d6_ggotpb_8&t=594s)
+YouTube video. Tests and a few comments have been added.

examples/Cart/navigation.json

@@ -0,0 +1,55 @@
+[
+    {
+        "title": "Intro",
+        "slug": "intro",
+        "items": [
+            {
+                "title": "About",
+                "slug": "readme",
+                "path": "README.md"
+            }
+        ]
+    },
+    {
+        "title": "Events",
+        "slug": "events",
+        "items": [
+            {
+                "title": "ItemRestocked",
+                "slug": "restock",
+                "path": "src/Events/ItemRestocked.php"
+            },
+            {
+                "title": "ItemAddedToCart",
+                "slug": "add-to-cart",
+                "path": "src/Events/ItemAddedToCart.php"
+            },
+            {
+                "title": "ItemRemovedFromCart",
+                "slug": "remove-from-cart",
+                "path": "src/Events/ItemRemovedFromCart.php"
+            },
+            {
+                "title": "CheckedOut",
+                "slug": "checkout",
+                "path": "src/Events/CheckedOut.php"
+            }
+        ]
+    },
+    {
+        "title": "State",
+        "slug": "state",
+        "items": [
+            {
+                "title": "CartState",
+                "slug": "cart",
+                "path": "src/States/CartState.php"
+            },
+            {
+                "title": "ItemState",
+                "slug": "item",
+                "path": "src/States/ItemState.php"
+            }
+        ]
+    }
+]

examples/Cart/src/Console/Commands/ShopCommand.php

@@ -0,0 +1,96 @@
+<?php
+
+namespace Thunk\Verbs\Examples\Cart\Console\Commands;
+
+use Closure;
+use Exception;
+use Illuminate\Console\Command;
+use Thunk\Verbs\Examples\Cart\Events\CheckedOut;
+use Thunk\Verbs\Examples\Cart\Events\ItemAddedToCart;
+use Thunk\Verbs\Examples\Cart\Events\ItemRemovedFromCart;
+use Thunk\Verbs\Examples\Cart\Events\ItemRestocked;
+
+use function Laravel\Prompts\error;
+use function Laravel\Prompts\select;
+use function Laravel\Prompts\text;
+
+class ShopCommand extends Command
+{
+    protected $signature = 'shop';
+
+    protected int $cart_id;
+
+    protected array $stickers;
+
+    public function handle()
+    {
+        $this->setup();
+
+        do {
+            try {
+                $action = $this->action();
+                $this->getLaravel()->forgetScopedInstances(); // Emulate a new request
+                $action();
+            } catch (Exception $exception) {
+                error("Error: {$exception->getMessage()}");
+            }
+        } while (true);
+    }
+
+    protected function action(): Closure
+    {
+        $selection = select(
+            label: 'What would you like to do?',
+            options: [
+                'Add item to cart',
+                'Remove item from cart',
+                'Check out',
+                'Restock items',
+            ]
+        );
+
+        return match ($selection) {
+            'Add item to cart' => function () {
+                [$item, $quantity] = $this->selectSticker();
+                ItemAddedToCart::commit(cart: $this->cart_id, item: $item, quantity: $quantity);
+            },
+            'Remove item from cart' => function () {
+                [$item, $quantity] = $this->selectSticker();
+                ItemRemovedFromCart::commit(cart: $this->cart_id, item: $item, quantity: $quantity);
+            },
+            'Check out' => function () {
+                CheckedOut::commit(cart: $this->cart_id);
+            },
+            'Restock items' => function () {
+                [$sticker, $quantity] = $this->selectSticker(4);
+                ItemRestocked::commit(item: $sticker, quantity: (int) $quantity);
+            },
+        };
+    }
+
+    protected function selectSticker($default_quantity = 1): array
+    {
+        $sticker = select('Which sticker?', $this->stickers);
+        $quantity = (int) text('Quantity', default: $default_quantity, required: true, validate: ['quantity' => 'required|int|min:1']);
+
+        return [$sticker, $quantity];
+    }
+
+    protected function setup()
+    {
+        // Each time we load our app we'll create a new shopping cart by assigning
+        // it a unique ID.
+
+        $this->cart_id = snowflake_id();
+
+        // These are entirely arbitrary IDs. They're just hard-coded so that they're
+        // consistent across separate runs of the app.
+
+        $this->stickers = [
+            1000 => 'PHP×Philly',
+            1001 => 'Ignore Prev. Instructions',
+            1002 => 'Verbs',
+            1003 => 'Over Engineered',
+        ];
+    }
+}

examples/Cart/src/Events/CheckedOut.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Thunk\Verbs\Examples\Cart\Events;
+
+use Thunk\Verbs\Event;
+use Thunk\Verbs\Examples\Cart\States\CartState;
+use Thunk\Verbs\Examples\Cart\States\ItemState;
+
+class CheckedOut extends Event
+{
+    public CartState $cart;
+
+    public function validate()
+    {
+        $this->assert(! $this->cart->checked_out, 'Already checked out');
+
+        foreach ($this->cart->items as $item_id => $quantity) {
+            $item = ItemState::load($item_id);
+            $held = $item->activeHolds()[$this->cart->id]['quantity'] ?? 0;
+            $this->assert($held + $item->available() >= $quantity, 'Some items in your cart are out of stock');
+        }
+    }
+
+    public function apply()
+    {
+        foreach ($this->cart->items as $item_id => $quantity) {
+            $item = ItemState::load($item_id);
+            $item->quantity -= $quantity;
+            unset($item->holds[$this->cart->id]);
+        }
+
+        $this->cart->checked_out = true;
+    }
+}

examples/Cart/src/Events/ItemAddedToCart.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Thunk\Verbs\Examples\Cart\Events;
+
+use Thunk\Verbs\Event;
+use Thunk\Verbs\Examples\Cart\States\CartState;
+use Thunk\Verbs\Examples\Cart\States\ItemState;
+
+class ItemAddedToCart extends Event
+{
+    public static int $item_limit = 2;
+
+    public static int $hold_seconds = 5;
+
+    public ItemState $item;
+
+    public CartState $cart;
+
+    public int $quantity;
+
+    public function validate()
+    {
+        $this->assert(! $this->cart->checked_out, 'Already checked out');
+
+        $this->assert(
+            $this->item->available() >= $this->quantity,
+            'Out of stock',
+        );
+
+        $this->assert(
+            $this->cart->count($this->item->id) + $this->quantity <= self::$item_limit,
+            'Reached limit'
+        );
+    }
+
+    public function apply()
+    {
+        // Add (additional?) quantity to cart
+        $this->cart->items[$this->item->id] = $this->cart->count($this->item->id) + $this->quantity;
+
+        // Initialize hold to 0 if it doesn't already exist
+        $this->item->holds[$this->cart->id] ??= [
+            'quantity' => 0,
+            'expires' => now()->unix() + self::$hold_seconds,
+        ];
+
+        // Add quantity to hold
+        $this->item->holds[$this->cart->id]['quantity'] += $this->quantity;
+    }
+}

examples/Cart/src/Events/ItemRemovedFromCart.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Thunk\Verbs\Examples\Cart\Events;
+
+use Thunk\Verbs\Event;
+use Thunk\Verbs\Examples\Cart\States\CartState;
+use Thunk\Verbs\Examples\Cart\States\ItemState;
+
+class ItemRemovedFromCart extends Event
+{
+    public CartState $cart;
+
+    public ItemState $item;
+
+    public int $quantity;
+
+    public function validate()
+    {
+        $this->assert(! $this->cart->checked_out, 'Already checked out');
+
+        $this->assert(
+            $this->cart->count($this->item->id) >= $this->quantity,
+            "There aren't {$this->quantity} items in the cart to remove."
+        );
+    }
+
+    public function apply()
+    {
+        $this->cart->items[$this->item->id] -= $this->quantity;
+
+        if (isset($this->item->holds[$this->cart->id])) {
+            $this->item->holds[$this->cart->id]['quantity'] -= $this->quantity;
+        }
+    }
+}

examples/Cart/src/Events/ItemRestocked.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Thunk\Verbs\Examples\Cart\Events;
+
+use Thunk\Verbs\Event;
+use Thunk\Verbs\Examples\Cart\States\ItemState;
+
+class ItemRestocked extends Event
+{
+    public ItemState $item;
+
+    public int $quantity;
+
+    public function apply()
+    {
+        $this->item->quantity += $this->quantity;
+    }
+}