feat(client): add inventory manipulation wrappers

src/lua/container/item_stack.rs

@@ -0,0 +1,50 @@
+use azalea::inventory::components::{CustomName, Damage, MaxDamage};
+use mlua::{UserData, UserDataFields, UserDataMethods};
+
+pub struct ItemStack {
+    pub inner: azalea::inventory::ItemStack,
+}
+
+impl UserData for ItemStack {
+    fn add_fields<F: UserDataFields<Self>>(f: &mut F) {
+        f.add_field_method_get("is_empty", |_, this| Ok(this.inner.is_empty()));
+        f.add_field_method_get("is_present", |_, this| Ok(this.inner.is_present()));
+        f.add_field_method_get("count", |_, this| Ok(this.inner.count()));
+        f.add_field_method_get("kind", |_, this| Ok(this.inner.kind().to_string()));
+        f.add_field_method_get("custom_name", |_, this| {
+            Ok(if let Some(data) = this.inner.as_present() {
+                data.components
+                    .get::<CustomName>()
+                    .map(|n| n.name.to_string())
+            } else {
+                None
+            })
+        });
+        f.add_field_method_get("damage", |_, this| {
+            Ok(if let Some(data) = this.inner.as_present() {
+                data.components.get::<Damage>().map(|d| d.amount)
+            } else {
+                None
+            })
+        });
+        f.add_field_method_get("max_damage", |_, this| {
+            Ok(if let Some(data) = this.inner.as_present() {
+                data.components.get::<MaxDamage>().map(|d| d.amount)
+            } else {
+                None
+            })
+        });
+    }
+
+    fn add_methods<M: UserDataMethods<Self>>(m: &mut M) {
+        m.add_method_mut("split", |_, this, count: u32| {
+            Ok(ItemStack {
+                inner: this.inner.split(count),
+            })
+        });
+        m.add_method_mut("update_empty", |_, this, (): ()| {
+            this.inner.update_empty();
+            Ok(())
+        });
+    }
+}