Add selection guard

src/components/ModelingMachineProvider.tsx

@@ -50,6 +50,7 @@ import {
   isSketchPipe,
   Selections,
   updateSelections,
+  canLoftSelection,
 } from 'lib/selections'
 import { applyConstraintIntersect } from './Toolbar/Intersect'
 import { applyConstraintAbsDistance } from './Toolbar/SetAbsDistance'
@@ -569,6 +570,29 @@ export const ModelingMachineProvider = ({
           if (err(canSweep)) return false
           return canSweep
         },
+        'has valid loft selection': ({ context: { selectionRanges } }) => {
+          console.log('selectionRanges', selectionRanges)
+          // A user can begin lofting if they either have 2+ faces selected or nothing selected
+          // TODO: this is a dummy copy from the sweep one
+          const hasNoSelection =
+            selectionRanges.graphSelections.length === 0 ||
+            isRangeBetweenCharacters(selectionRanges) ||
+            isSelectionLastLine(selectionRanges, codeManager.code)
+
+          if (hasNoSelection) {
+            // they have no selection, we should enable the button
+            // so they can select the faces through the cmdbar
+            // BUT only if there's extrudable geometry
+            return doesSceneHaveSweepableSketch(kclManager.ast)
+          }
+          // TODO: check if we need a check like this for loft
+          console.log('isSketchPipe(selectionRanges)', isSketchPipe(selectionRanges))
+          // if (!isSketchPipe(selectionRanges)) return false
+
+          const canLoft = canLoftSelection(selectionRanges)
+          if (err(canLoft)) return false
+          return canLoft
+        },
         'has valid selection for deletion': ({
           context: { selectionRanges },
         }) => {