Improve status messages around model loading

crates/fj-host/src/evaluator.rs

@@ -1,6 +1,6 @@
 use std::thread;
 
-use crossbeam_channel::{Receiver, Sender};
+use crossbeam_channel::{Receiver, SendError, Sender};
 
 use crate::{Error, Evaluation, Model};
 
@@ -18,19 +18,29 @@ impl Evaluator {
 
         thread::spawn(move || {
             while let Ok(TriggerEvaluation) = trigger_rx.recv() {
+                if let Err(SendError(_)) =
+                    event_tx.send(ModelEvent::ChangeDetected)
+                {
+                    break;
+                }
+
                 let evaluation = match model.evaluate() {
                     Ok(evaluation) => evaluation,
                     Err(err) => {
-                        event_tx
-                            .send(ModelEvent::Error(err))
-                            .expect("Expected channel to never disconnect");
+                        if let Err(SendError(_)) =
+                            event_tx.send(ModelEvent::Error(err))
+                        {
+                            break;
+                        }
                         continue;
                     }
                 };
 
-                event_tx
-                    .send(ModelEvent::Evaluation(evaluation))
-                    .expect("Expected channel to never disconnect");
+                if let Err(SendError(_)) =
+                    event_tx.send(ModelEvent::Evaluation(evaluation))
+                {
+                    break;
+                };
             }
 
             // The channel is disconnected, which means this instance of
@@ -60,6 +70,9 @@ pub struct TriggerEvaluation;
 
 /// An event emitted by [`Evaluator`]
 pub enum ModelEvent {
+    /// A change in the model has been detected
+    ChangeDetected,
+
     /// The model has been evaluated
     Evaluation(Evaluation),
 

crates/fj-viewer/src/status_report.rs

@@ -20,7 +20,7 @@ impl StatusReport {
     pub fn update_status(&mut self, status: &str) {
         let date = {
             let date = Local::now();
-            format!("{}", date.format("[%H:%M:%S]"))
+            format!("{}", date.format("[%H:%M:%S.%3f]"))
         };
         let empty_space = " ".repeat(date.chars().count());
 

crates/fj-window/src/run.rs

@@ -69,11 +69,13 @@ pub fn run(
                 };
 
                 match event {
+                    ModelEvent::ChangeDetected => {
+                        status.update_status(
+                            "Change in model detected. Compiling...",
+                        );
+                    }
                     ModelEvent::Evaluation(evaluation) => {
-                        status.update_status(&format!(
-                            "Model compiled successfully in {}!",
-                            evaluation.compile_time
-                        ));
+                        status.update_status("Model compiled. Processing...");
 
                         match shape_processor.process(&evaluation.shape) {
                             Ok(shape) => {
@@ -95,6 +97,8 @@ pub fn run(
                                 }
                             }
                         }
+
+                        status.update_status("Model processed.");
                     }
 
                     ModelEvent::Error(err) => {