Finish merging evaluator into host

crates/fj-host/src/host.rs

@@ -1,10 +1,11 @@
 use std::thread;
 
 use crossbeam_channel::{unbounded, Receiver, Sender};
+use fj_interop::processed_shape::ProcessedShape;
 use fj_operations::shape_processor::ShapeProcessor;
 use winit::event_loop::EventLoopProxy;
 
-use crate::{HostCommand, HostHandle, Model, ModelEvent, Watcher};
+use crate::{Error, HostCommand, HostHandle, Model, Watcher};
 
 // Use a zero-sized error type to silence `#[warn(clippy::result_large_err)]`.
 // The only error from `EventLoopProxy::send_event` is `EventLoopClosed<T>`,
@@ -117,3 +118,22 @@ impl Host {
         Ok(())
     }
 }
+
+/// An event emitted by the host thread
+#[derive(Debug)]
+pub enum ModelEvent {
+    /// A new model is being watched
+    StartWatching,
+
+    /// A change in the model has been detected
+    ChangeDetected,
+
+    /// The model has been evaluated
+    Evaluated,
+
+    /// The model has been processed
+    ProcessedShape(ProcessedShape),
+
+    /// An error
+    Error(Error),
+}

crates/fj-host/src/lib.rs

@@ -15,7 +15,6 @@
 
 #![warn(missing_docs)]
 
-mod evaluator;
 mod host;
 mod host_handle;
 mod model;
@@ -24,8 +23,7 @@ mod platform;
 mod watcher;
 
 pub use self::{
-    evaluator::ModelEvent,
-    host::{EventLoopClosed, Host},
+    host::{EventLoopClosed, Host, ModelEvent},
     host_handle::{HostCommand, HostHandle},
     model::{Error, Evaluation, Model},
     parameters::Parameters,