Clean up StringName pooling and Singleton usages

backends/sdl/src/input.rs

@@ -83,6 +83,7 @@ fn convert_scancode(scan_code: SDL_Keycode) -> Option<VirtualKey> {
     SDL_KeyCode::SDLK_DOWN => Some(ArrowDown),
     SDL_KeyCode::SDLK_LEFT => Some(ArrowLeft),
     SDL_KeyCode::SDLK_RIGHT => Some(ArrowRight),
+    SDL_KeyCode::SDLK_SPACE => Some(Space),
     _ => None,
   }
 }

core/common/src/abstractions/callbacks.rs

@@ -34,6 +34,12 @@ impl Display for CallbackError {
 #[derive(Clone)]
 pub struct Callable(Arc<dyn Fn(&[Variant]) -> Result<Variant, CallbackError>>);
 
+/// Represents a value that can be converted into a [`Callable`] function.
+pub trait IntoCallable {
+  /// Converts the value into a [`Callable`] function.
+  fn into_callable(self) -> Callable;
+}
+
 impl Callable {
   /// Creates a new boxed callable function from the given function.
   pub fn from_function(function: impl Fn(&[Variant]) -> Result<Variant, CallbackError> + 'static) -> Self {

core/common/src/abstractions/variant.rs

@@ -439,6 +439,19 @@ impl_variant!(Quat, Quat);
 impl_variant!(Color, Color);
 impl_variant!(Color32, Color32);
 
+/// Allow [`Variant`] to be converted to/from itself.
+impl ToVariant for Variant {
+  fn to_variant(&self) -> Variant {
+    self.clone()
+  }
+}
+
+impl FromVariant for Variant {
+  fn from_variant(variant: Variant) -> Result<Self, VariantError> {
+    Ok(variant)
+  }
+}
+
 /// Allow [`Arc`] of [`Any`] to be converted to/from Variant.
 impl<T: Any> ToVariant for Arc<T> {
   fn to_variant(&self) -> Variant {

core/common/src/concurrency/tasks.rs

@@ -7,6 +7,8 @@ use std::{
   task::{Context, Poll},
 };
 
+use crate::Singleton;
+
 /// A continuation that can be executed.
 type Continuation = dyn FnOnce() -> ();
 
@@ -55,20 +57,12 @@ impl<T> Task<T> {
 }
 
 /// A scheduler for [`Task`]s.
-#[derive(Default)]
+#[derive(Default, Singleton)]
 struct TaskScheduler {
   continuations: Mutex<crate::SwapVec<Box<Continuation>>>,
 }
 
-/// The global task scheduler.
-static TASK_SCHEDULER: crate::UnsafeSingleton<TaskScheduler> = crate::UnsafeSingleton::default();
-
 impl TaskScheduler {
-  /// Returns the current task scheduler.
-  pub fn current() -> &'static Self {
-    &TASK_SCHEDULER
-  }
-
   /// Schedules a [`Continuation`] to be executed.
   pub fn schedule(&self, continuation: Box<Continuation>) {
     let mut continuations = self.continuations.lock().unwrap();
@@ -129,11 +123,10 @@ impl<T: Unpin> Future for Task<T> {
 #[cfg(test)]
 mod tests {
   use super::*;
-  use crate::BlockableFuture;
 
   #[test]
   fn test_basic_task_continuations() {
-    let scheduler = TaskScheduler::current();
+    let scheduler = TaskScheduler::instance();
 
     scheduler.schedule(Box::new(|| {
       println!("Hello, world!");

core/common/src/io/virtualfs.rs

@@ -4,7 +4,7 @@ pub use local::*;
 pub use memory::*;
 
 use super::{InputStream, OutputStream};
-use crate::{StringName, ToStringName, UnsafeSingleton};
+use crate::{Singleton, StringName, ToStringName};
 
 mod local;
 mod memory;
@@ -35,12 +35,11 @@ pub trait FileSystem: Send + Sync {
 /// This is a singleton that is used to manage [`FileSystem`] implementations.
 /// File systems can be registered here, and will be used subsequently for file
 /// operations on [`VirtualPath`] instances.
+#[derive(Singleton)]
 pub struct FileSystemManager {
   file_systems: Vec<Box<dyn FileSystem>>,
 }
 
-static mut FILE_SYSTEM_MANAGER: UnsafeSingleton<FileSystemManager> = UnsafeSingleton::default();
-
 impl Default for FileSystemManager {
   fn default() -> Self {
     Self {
@@ -56,22 +55,18 @@ impl Default for FileSystemManager {
 impl FileSystemManager {
   /// Registers a new [`FileSystem`] with the manager.
   pub fn register(file_system: impl FileSystem + 'static) {
-    unsafe {
-      FILE_SYSTEM_MANAGER.file_systems.push(Box::new(file_system));
-    }
+    Self::instance().file_systems.push(Box::new(file_system));
   }
 
   /// Finds the appropriate [`FileSystem`] for the given [`VirtualPath`].
   pub fn with_filesystem<R>(path: &VirtualPath, body: impl FnOnce(&dyn FileSystem) -> R) -> R {
-    unsafe {
-      for file_system in &FILE_SYSTEM_MANAGER.file_systems {
-        if file_system.can_handle(path) {
-          return body(file_system.as_ref());
-        }
+    for file_system in &Self::instance().file_systems {
+      if file_system.can_handle(path) {
+        return body(file_system.as_ref());
       }
-
-      panic!("No file system found for scheme {}", path.scheme());
     }
+
+˚    panic!("No file system found for scheme {}", path.scheme());
   }
 }
 

core/common/src/lib.rs

@@ -10,6 +10,8 @@
 #![feature(noop_waker)]
 #![feature(async_closure)]
 
+extern crate self as common;
+
 pub use abstractions::*;
 pub use collections::*;
 pub use concurrency::*;
@@ -33,4 +35,4 @@ mod network;
 mod strings;
 mod utilities;
 
-pub use macros::{profiling, Asset, Deserialize, Reflect, Serialize, Trace};
+pub use macros::{profiling, Asset, Deserialize, Reflect, Serialize, Singleton, Trace};

core/common/src/lua.rs

@@ -555,8 +555,6 @@ struct LuaArc<T: ?Sized>(Arc<T>);
 
 impl<T: ?Sized> LuaUserData for LuaArc<T> {}
 
-// TODO: think about using Reflect-able types for Lua?
-
 #[cfg(test)]
 mod tests {
   use super::*;