component: Replace linkme with inventory (#30705)

This PR replaces the use of `linkme` with `inventory` for the component
preview registration.

Release Notes:

- N/A

crates/component/Cargo.toml

@@ -14,7 +14,7 @@ path = "src/component.rs"
 [dependencies]
 collections.workspace = true
 gpui.workspace = true
-linkme.workspace = true
+inventory.workspace = true
 parking_lot.workspace = true
 strum.workspace = true
 theme.workspace = true

crates/component/src/component.rs

@@ -9,13 +9,12 @@
 
 mod component_layout;
 
-pub use component_layout::*;
-
 use std::sync::LazyLock;
 
+pub use component_layout::*;
+
 use collections::HashMap;
 use gpui::{AnyElement, App, SharedString, Window};
-use linkme::distributed_slice;
 use parking_lot::RwLock;
 use strum::{Display, EnumString};
 
@@ -24,12 +23,27 @@ pub fn components() -> ComponentRegistry {
 }
 
 pub fn init() {
-    let component_fns: Vec<_> = __ALL_COMPONENTS.iter().cloned().collect();
-    for f in component_fns {
-        f();
+    for f in inventory::iter::<ComponentFn>() {
+        (f.0)();
     }
 }
 
+pub struct ComponentFn(fn());
+
+impl ComponentFn {
+    pub const fn new(f: fn()) -> Self {
+        Self(f)
+    }
+}
+
+inventory::collect!(ComponentFn);
+
+/// Private internals for macros.
+#[doc(hidden)]
+pub mod __private {
+    pub use inventory;
+}
+
 pub fn register_component<T: Component>() {
     let id = T::id();
     let metadata = ComponentMetadata {
@@ -46,9 +60,6 @@ pub fn register_component<T: Component>() {
     data.components.insert(id, metadata);
 }
 
-#[distributed_slice]
-pub static __ALL_COMPONENTS: [fn()] = [..];
-
 pub static COMPONENT_DATA: LazyLock<RwLock<ComponentRegistry>> =
     LazyLock::new(|| RwLock::new(ComponentRegistry::default()));