From 0d103cd3daa02bbb1283a3d69853de809e96447c Mon Sep 17 00:00:00 2001
From: Stewart Allen <sa@grid.space>
Date: Mon, 27 Mar 2023 15:20:51 -0400
Subject: [PATCH] replace throw with return error

---
 src/kiri-mode/cam/slice.js | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/kiri-mode/cam/slice.js b/src/kiri-mode/cam/slice.js
index 457d43ac..cd075ba7 100644
--- a/src/kiri-mode/cam/slice.js
+++ b/src/kiri-mode/cam/slice.js
@@ -80,30 +80,34 @@ CAM.slice = async function(settings, widget, onupdate, ondone) {
         });
     }
 
+    function error(msg) {
+        ondone(msg);
+    }
+
     if (unsafe) {
         console.log("disabling overhang safeties");
     }
 
     if (!proc.ops || proc.ops.length === 0) {
-        throw 'no processes specified';
+        return error('no processes specified');
     }
 
     if (stock.x && stock.y && stock.z) {
         if (stock.x + 0.00001 < bounds.max.x - bounds.min.x) {
-            throw 'stock X too small for part. resize stock or use offset stock';
+            return error('stock X too small for part. resize stock or use offset stock');
         }
 
         if (stock.y + 0.00001 < bounds.max.y - bounds.min.y) {
-            throw 'stock Y too small for part. resize stock or use offset stock';
+            return error('stock Y too small for part. resize stock or use offset stock');
         }
 
         if (stock.z + 0.00001 < bounds.max.z - bounds.min.z) {
-            throw 'stock Z too small for part. resize stock or use offset stock';
+            return error('stock Z too small for part. resize stock or use offset stock');
         }
     }
 
     if (zMin >= bounds.max.z) {
-        throw `invalid z bottom ${(zMin/units).round(3)} >= bounds z max ${(zMax/units).round(3)}`;
+        return error(`invalid z bottom ${(zMin/units).round(3)} >= bounds z max ${(zMax/units).round(3)}`);
     }
 
     let mark = Date.now();