Bugfix: eliminate dead-end in certain animator layers

Because the custom chatbox doesn't necessarily have an even multiple of
`sync_params` character slots, some layers in the animator write N
character slots while others write N-1. In the layers with only N-1
slots, they need something to do while slot N is being selected. This
patch creates a return-home transition in that case.

2 files changed, 19 insertions, 1 deletions

diff --git a/Scripts/generate_utils.py b/Scripts/generate_utils.py
index 1e12103..7d231f9 100644
--- a/Scripts/generate_utils.py
+++ b/Scripts/generate_utils.py
@@ -23,6 +23,15 @@ class Config():
         else:
             return ceil(float_result)
 
+    def layerNeedsParity(self, which_layer):
+        num_cells = self.BOARD_ROWS * self.BOARD_COLS
+        layers_in_last_region = num_cells % self.CHARS_PER_SYNC
+        float_result = num_cells / self.CHARS_PER_SYNC
+        if which_layer >= layers_in_last_region:
+            return True
+        else:
+            return False
+
 config = Config()
 
 # Implementation detail. We use this parameter to return from the terminal
diff --git a/Scripts/libtastt.py b/Scripts/libtastt.py
index 5e216ca..4b4dda9 100644
--- a/Scripts/libtastt.py
+++ b/Scripts/libtastt.py
@@ -761,7 +761,16 @@ def generateFXLayer(which_layer: int, anim: libunity.UnityAnimator, layer:
         dummy_param = generate_utils.getDummyParam()
         anim.addTransitionBooleanCondition(state,
                 home_state_transition, dummy_param, False)
-    pass
+    
+    if generate_utils.config.layerNeedsParity(which_layer):
+        # There may be layers which never write to the text box. In this case,
+        # when those layers are turned on to write to that last region, they
+        # simply transition back to the default (idle) state.
+        home_state_transition = anim.addTransition(default_state)
+        select_param = generate_utils.getSelectParam()
+        i = generate_utils.config.numRegions(0) - 1
+        anim.addTransitionIntegerEqualityCondition(active_state,
+                home_state_transition, select_param, i)
 
 # Generic toggle adding utility.
 # Generates the layer and parameter.