Add a wield command

Add a Wield command, which prompts for a wieldable item, if any, to take
out of the character's inventory and put in their right hand.

Eventually we should support other hands, but for now hardcoding the
right hand should be fine.

src/Xanthous/App.hs

@@ -36,6 +36,7 @@ import           Xanthous.Game.Prompt
 import           Xanthous.Monad
 import           Xanthous.Resource (Name, Panel(..))
 import qualified Xanthous.Messages as Messages
+import           Xanthous.Util (removeVectorIndex)
 import           Xanthous.Util.Inflection (toSentence)
 --------------------------------------------------------------------------------
 import qualified Xanthous.Entities.Character as Character
@@ -46,7 +47,10 @@ import           Xanthous.Entities.Creature (Creature)
 import qualified Xanthous.Entities.Creature as Creature
 import           Xanthous.Entities.Environment
                  (Door, open, locked, GroundMessage(..))
-import           Xanthous.Entities.RawTypes (edible, eatMessage, hitpointsHealed)
+import           Xanthous.Entities.RawTypes
+                 ( edible, eatMessage, hitpointsHealed
+                 , wieldable
+                 )
 import           Xanthous.Generators
 import qualified Xanthous.Generators.CaveAutomata as CaveAutomata
 --------------------------------------------------------------------------------
@@ -197,9 +201,7 @@ handleCommand Eat = do
             menuItems = mkMenuItems $ imap foodMenuItem food
         in menu_ ["eat", "menuPrompt"] Cancellable menuItems
           $ \(MenuResult (idx, item, edibleItem)) -> do
-            character . inventory . backpack %= \inv ->
-              let (before, after) = V.splitAt idx inv
-              in before <> fromMaybe Empty (tailMay after)
+            character . inventory . backpack %= removeVectorIndex idx
             let msg = fromMaybe (Messages.lookup ["eat", "eat"])
                       $ edibleItem ^. eatMessage
             character . characterHitpoints' +=
@@ -233,6 +235,24 @@ handleCommand Read = do
 
 handleCommand ShowInventory = showPanel InventoryPanel >> continue
 
+handleCommand Wield = do
+  uses (character . inventory . backpack)
+       (V.mapMaybe (\item ->
+                      (WieldedItem item) <$> item ^. Item.itemType . wieldable))
+    >>= \case
+      Empty -> say_ ["wield", "nothing"]
+      wieldables ->
+        menu_ ["wield", "menu"] Cancellable (wieldableMenu wieldables)
+        $ \(MenuResult (idx, item)) -> do
+          character . inventory . backpack %= removeVectorIndex idx
+          character . inventory . wielded .= inRightHand item
+          say ["wield", "wielded"] item
+  continue
+  where
+    wieldableMenu = mkMenuItems . imap wieldableMenuItem
+    wieldableMenuItem idx wi@(WieldedItem item _) =
+      (entityMenuChar item, MenuOption (description item) (idx, wi))
+
 handleCommand Save = do
   -- TODO default save locations / config file?
   prompt_ @'StringPrompt ["save", "location"] Cancellable
@@ -433,11 +453,15 @@ entityMenu_ = mkMenuItems @[_] . map entityMenuItem
     entityMenuItem wentity
       = let entity = extract wentity
       in (entityMenuChar entity, MenuOption (description entity) wentity)
-    entityMenuChar entity
-      = let ec = entityChar entity ^. char
-        in if ec `elem` (['a'..'z'] ++ ['A'..'Z'])
-           then ec
-           else 'a'
+
+
+entityMenuChar :: Entity a => a -> Char
+entityMenuChar entity
+  = let ec = entityChar entity ^. char
+    in if ec `elem` (['a'..'z'] ++ ['A'..'Z'])
+        then ec
+        else 'a'
+
 
 -- entityMenu :: Entity entity => [entity] -> Map Char (MenuOption entity)
 -- entityMenu = map (map runIdentity) . entityMenu_ . fmap Identity