feat(grfn/xanthous): Use dual-wielding to calculate damage

When dual-wielding weapons, do damage from both weapons and use both
weapons' attack messages.

Change-Id: I3c404946d0167c9b5c2bcf58ab5c3429cc5269fc
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5605
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

users/grfn/xanthous/src/Xanthous/App.hs

@@ -467,19 +467,24 @@ attackAt pos =
   attackCreature creature = do
     charDamage <- uses character characterDamage
     creature' <- damageCreature creature charDamage
-    msg <- uses character getAttackMessage
-    unless (Creature.isDead creature')
-      . message msg $ object ["creature" A..= creature']
+    unless (Creature.isDead creature') $ writeAttackMessage creature'
     whenM (uses character $ isNothing . weapon) handleFists
     stepGame
   weapon chr = chr ^? inventory . wielded . wieldedItems . wieldableItem
-  getAttackMessage chr =
-    case weapon chr of
-      Just wi ->
-        fromMaybe (Messages.lookup ["combat", "hit", "generic"])
-        $ wi ^. attackMessage
-      Nothing ->
-        Messages.lookup ["combat", "hit", "fists"]
+  writeAttackMessage creature = do
+    let params = object ["creature" A..= creature]
+    attackMessages <- uses character getAttackMessages
+    msg <- intercalate " and " <$> for attackMessages (`Messages.render` params)
+    writeMessage $ "You " <> msg
+  getAttackMessages chr =
+    case chr ^.. inventory . wielded . wieldedItems . wieldableItem of
+      [] -> [Messages.lookup ["combat", "hit", "fists"]]
+      is ->
+        is
+        <&> \wi ->
+              fromMaybe (Messages.lookup ["combat", "hit", "generic"])
+              $ wi ^. attackMessage
+
 
   handleFists = do
     damageChance <- use $ character . body . knuckles . to fistDamageChance

users/grfn/xanthous/src/Xanthous/Entities/Character.hs

@@ -218,7 +218,9 @@ defaultCharacterDamage = 1
 characterDamage :: Character -> Hitpoints
 characterDamage
   = fromMaybe defaultCharacterDamage
-  . preview (inventory . wielded . wieldedItems . wieldableItem . Raw.damage)
+  . filter (/= 0)
+  . Just
+  . sumOf (inventory . wielded . wieldedItems . wieldableItem . Raw.damage)
 
 -- | Is the character fully healed up to or past their initial hitpoints?
 isFullyHealed :: Character -> Bool

users/grfn/xanthous/src/Xanthous/Entities/RawTypes.hs

@@ -200,6 +200,15 @@ makeFieldsNoPrefix ''EdibleItem
 
 data WieldableItem = WieldableItem
   { _damage :: !Hitpoints
+    -- | Message to use when the character is using this item to attack a
+    --  creature.
+    --
+    -- Grammatically, this should be of the form "slash at the
+    -- {{creature.creatureType.name}} with your dagger"
+    --
+    -- = Parameters
+    --
+    -- [@creature@ (type: 'Creature')] The creature being attacked
   , _attackMessage :: !(Maybe Message)
     -- | Message to use when a creature is using this item to attack the
     -- character.

users/grfn/xanthous/src/Xanthous/Entities/Raws/broken-dagger.yaml

@@ -9,8 +9,8 @@ Item:
   wieldable:
     damage: 3
     attackMessage:
-      - You slash at the {{creature.creatureType.name}} with your dagger.
-      - You stab the {{creature.creatureType.name}} with your dagger.
+      - slash at the {{creature.creatureType.name}} with your dagger
+      - stab the {{creature.creatureType.name}} with your dagger
     creatureAttackMessage:
       - The {{creature.creatureType.name}} slashes at you with its dagger.
       - The {{creature.creatureType.name}} stabs you with its dagger.

users/grfn/xanthous/src/Xanthous/Entities/Raws/rock.yaml

@@ -5,6 +5,6 @@ Item:
   char: .
   wieldable:
     damage: 1
-    attackMessage: you hit the {{creature.creatureType.name}} in the head with your rock.
+    attackMessage: hit the {{creature.creatureType.name}} in the head with your rock
   density: [ 1500000, 2500000 ]
   volume: [ 0.000125, 0.001 ]

users/grfn/xanthous/src/Xanthous/Entities/Raws/stick.yaml

@@ -9,9 +9,9 @@ Item:
   wieldable:
     damage: 2
     attackMessage:
-      - You bonk the {{creature.creatureType.name}} over the head with your stick.
-      - You bash the {{creature.creatureType.name}} on the noggin with your stick.
-      - You whack the {{creature.creatureType.name}} with your stick.
+      - bonk the {{creature.creatureType.name}} over the head with your stick
+      - bash the {{creature.creatureType.name}} on the noggin with your stick
+      - whack the {{creature.creatureType.name}} with your stick
     creatureAttackMessage:
       - The {{creature.creatureType.name}} bonks you over the head with its stick.
       - The {{creature.creatureType.name}} bashes you on the noggin with its stick.