Fix bug in Mesh Switch node

I accidentally rearranged code last minute before merging and caused an "variable access before defined" bug :) oops. This update fixes it.

Fix bug in Mesh Switch node
I accidentally rearranged code last minute before merging and caused an "variable access before defined" bug :) oops. This update fixes it.
9f850064 · DolphinDream · 5e71cfc9 · 9f850064
--- a/nodes/modifier_change/mesh_switch.py
+++ b/nodes/modifier_change/mesh_switch.py
@@ -39,17 +39,17 @@ class SvMeshSwitchNode(bpy.types.Node, SverchCustomTreeNode):

    def update(self):
        inputs = self.inputs
-        if inputs[-2].links: # last Verts socket linked ? => create more sockets
+        if inputs[-2].links:  # last Verts socket linked ? => create more sockets
            name = ABC[int(len(inputs) / 2)]  # pick the next letter A to Z
            inputs.new("VerticesSocket", "Verts " + name)
            inputs.new("StringsSocket", "EdgePolys " + name)
        else:  # last Verts input unlinked ? => remove all but last unlinked
            # get the list of Verts socket labels (linked or unlinked)
            vertSockets = filter(lambda s: "Verts" in s.name, inputs)
-            socketLabels = [s.name[-1] for s in vertSockets] # (ABCD)
+            socketLabels = [s.name[-1] for s in vertSockets]  # (ABCD)
            # get the labels of last unlinked Verts sockets in reverse order
            unlinkedSocketLabels = []
-            for label in socketLabels[::-1]: # in reverse order (DCBA)
+            for label in socketLabels[::-1]:  # in reverse order (DCBA)
                if inputs["Verts " + label].is_linked:
                    break
                else:
@@ -76,15 +76,15 @@ class SvMeshSwitchNode(bpy.types.Node, SverchCustomTreeNode):

        inputs = self.inputs

+        # get the list of labels of the linked Verts input sockets
+        vertSockets = filter(lambda s: "Verts" in s.name and s.is_linked, inputs)
+        socketLabels = [s.name[-1] for s in vertSockets]  # (ABCD)
+
        input_n = inputs["Selected"].sv_get()[0][0]
        num = max(1, len(socketLabels))
        n = max(0, int(input_n)) % num

-        # get the list of labels of the linked Verts input sockets
-        vertSockets = filter(lambda s: "Verts" in s.name and s.is_linked, inputs)
-        socketLabels = [s.name[-1] for s in vertSockets] # (ABCD)
-
-        label = socketLabels[n] # the label of the selected input
+        label = socketLabels[n]  # the label of the selected input

        if outputs["Verts"].is_linked:
            verts = inputs["Verts " + label].sv_get()