Replace globals with editor environment (#3656)

Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/application.rs

@@ -1,24 +1,31 @@
 use crate::dispatcher::Dispatcher;
 use crate::messages::prelude::*;
 pub use graphene_std::uuid::*;
+use std::sync::OnceLock;
 
-// TODO: serialize with serde to save the current editor state
 pub struct Editor {
 	pub dispatcher: Dispatcher,
 }
 
 impl Editor {
-	/// Construct the editor.
-	/// Remember to provide a random seed with `editor::set_uuid_seed(seed)` before any editors can be used.
-	pub fn new() -> Self {
+	pub fn new(environment: Environment, uuid_random_seed: u64) -> Self {
+		ENVIRONMENT.set(environment).expect("Editor shoud only be initialized once");
+		graphene_std::uuid::set_uuid_seed(uuid_random_seed);
+
 		Self { dispatcher: Dispatcher::new() }
 	}
 
 	#[cfg(test)]
 	pub(crate) fn new_local_executor() -> (Self, crate::node_graph_executor::NodeRuntime) {
+		let _ = ENVIRONMENT.set(*Editor::environment());
+		graphene_std::uuid::set_uuid_seed(0);
+
 		let (runtime, executor) = crate::node_graph_executor::NodeGraphExecutor::new_with_local_runtime();
-		let dispatcher = Dispatcher::with_executor(executor);
-		(Self { dispatcher }, runtime)
+		let editor = Self {
+			dispatcher: Dispatcher::with_executor(executor),
+		};
+
+		(editor, runtime)
 	}
 
 	pub fn handle_message<T: Into<Message>>(&mut self, message: T) -> Vec<FrontendMessage> {
@@ -32,9 +39,53 @@ impl Editor {
 	}
 }
 
-impl Default for Editor {
-	fn default() -> Self {
-		Self::new()
+static ENVIRONMENT: OnceLock<Environment> = OnceLock::new();
+impl Editor {
+	#[cfg(not(test))]
+	pub fn environment() -> &'static Environment {
+		ENVIRONMENT.get().expect("Editor environment accessed before initialization")
+	}
+
+	#[cfg(test)]
+	pub fn environment() -> &'static Environment {
+		&Environment {
+			platform: Platform::Desktop,
+			host: Host::Linux,
+		}
+	}
+}
+
+#[derive(Clone, Copy, Debug)]
+pub struct Environment {
+	pub platform: Platform,
+	pub host: Host,
+}
+#[derive(Clone, Copy, Debug)]
+pub enum Platform {
+	Desktop,
+	Web,
+}
+#[derive(Clone, Copy, Debug)]
+pub enum Host {
+	Windows,
+	Mac,
+	Linux,
+}
+impl Environment {
+	pub fn is_desktop(&self) -> bool {
+		matches!(self.platform, Platform::Desktop)
+	}
+	pub fn is_web(&self) -> bool {
+		matches!(self.platform, Platform::Web)
+	}
+	pub fn is_windows(&self) -> bool {
+		matches!(self.host, Host::Windows)
+	}
+	pub fn is_mac(&self) -> bool {
+		matches!(self.host, Host::Mac)
+	}
+	pub fn is_linux(&self) -> bool {
+		matches!(self.host, Host::Linux)
 	}
 }