Add file

src/Dodge/Inventory/FindRoot.hs

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+module Dodge.Inventory.FindRoot where
+
+import Dodge.Item.Grammar
+import Dodge.Data.Creature
+import Data.Maybe
+import Control.Lens
+
+getRootItemID :: Int -> Creature -> Int
+getRootItemID i cr = fromMaybe i $ do
+    let adj = invAdj (_crInv cr)
+    adj ^? ix i . _1 . _Just . _1
+
+updateRootItemID :: Creature -> Creature
+updateRootItemID cr = fromMaybe cr $ do
+    i <- cr ^? crManipulation . manObject . inInventory . imSelectedItem
+    return $ cr & crManipulation . manObject . inInventory . imRootItem .~
+        getRootItemID i cr