Default components (#232)

* add default components

* remove debug prints

* clippy

* use default components

* fix tests

1 files changed, 20 insertions, 0 deletions

diff --git a/azalea-inventory/src/default_components/mod.rs b/azalea-inventory/src/default_components/mod.rs
new file mode 100644
index 00000000..e6150066
--- /dev/null
+++ b/azalea-inventory/src/default_components/mod.rs
@@ -0,0 +1,20 @@
+pub mod generated;
+
+use azalea_registry::Item;
+
+use crate::components::DataComponent;
+
+/// A [`DataComponent`] that some [`Item`]s may have a default value for.
+pub trait DefaultableComponent: DataComponent {
+    fn default_for_item(item: Item) -> Option<Self>
+    where
+        Self: Sized;
+}
+impl<T: DataComponent> DefaultableComponent for T {
+    default fn default_for_item(_item: Item) -> Option<Self> {
+        None
+    }
+}
+pub fn get_default_component<T: DefaultableComponent>(item: Item) -> Option<T> {
+    T::default_for_item(item)
+}