NPCs can drop nothing

CHANGELOG.md

@@ -59,6 +59,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Glider dimensions somewhat increased overall
 - Dungeon difficulty level starts at 1 instead of 0
 - The radius of the safe zone around the starting town has been doubled
+- NPCs can sometimes drop no loot at all
 
 ### Removed
 

assets/common/loot_tables/creature/bird_large/phoenix.ron

@@ -1,5 +1,4 @@
 [
     (0.1, Item("common.items.food.meat.bird_large_raw")),
     (1.0, Item("common.items.crafting_ing.animal_misc.phoenix_feather")),
-
 ]

assets/common/loot_tables/creature/quad_low/carapace.ron

@@ -1,4 +1,5 @@
 [
     (1.0, Item("common.items.food.meat.tough_raw")),
     (3.0, Item("common.items.crafting_ing.hide.carapace")),
+
 ]

assets/common/loot_tables/creature/quad_low/fanged.ron

@@ -1,5 +1,4 @@
 [
     (4.0, LootTable("common.loot_tables.creature.quad_low.generic")),
     (2.0, Item("common.items.crafting_ing.animal_misc.sharp_fang")),
-
 ]

assets/common/loot_tables/creature/quad_small/fur.ron

@@ -1,5 +1,4 @@
 [
     (1.0, ItemQuantity("common.items.crafting_ing.animal_misc.fur", 1, 3)),
     (0.25, LootTable("common.loot_tables.creature.quad_low.generic")),
-
 ]

assets/common/loot_tables/nothing.ron

@@ -0,0 +1,4 @@
+[
+    // No loot is dropped
+    (1.0, None),
+]

common/src/bin/csv_export/main.rs

@@ -267,6 +267,7 @@ fn loot_table(loot_table: &str) -> Result<(), Box<dyn Error>> {
             LootSpec::LootTable(table) => {
                 wtr.write_record(&[&chance, "LootTable", table, "", ""])?
             },
+            LootSpec::None => wtr.write_record(&[&chance, "None", "", ""])?,
         }
     }
 

common/src/bin/csv_import/main.rs

@@ -468,8 +468,9 @@ fn loot_table(loot_table: &str) -> Result<(), Box<dyn Error>> {
                     .expect("No loot table")
                     .to_string(),
             ),
+            "None" => LootSpec::None,
             a => panic!(
-                "Loot specifier kind must be either \"Item\" or \"LootTable\"\n{}",
+                "Loot specifier kind must be either \"Item\", \"LootTable\", or \"None\"\n{}",
                 a
             ),
         };

common/src/comp/inventory/item/mod.rs

@@ -795,7 +795,7 @@ impl Item {
     pub fn slot_mut(&mut self, slot: usize) -> Option<&mut InvSlot> { self.slots.get_mut(slot) }
 
     pub fn try_reclaim_from_block(block: Block) -> Option<Self> {
-        Some(block.get_sprite()?.collectible_id()?.to_item())
+        block.get_sprite()?.collectible_id()?.to_item()
     }
 
     pub fn ability_spec(&self) -> Option<&AbilitySpec> { self.item_def.ability_spec.as_ref() }

common/src/comp/inventory/trade_pricing.rs

@@ -113,6 +113,7 @@ impl From<Vec<(f32, LootSpec<String>)>> for ProbabilityFile {
                             .collect::<Vec<_>>()
                             .into_iter()
                     },
+                    LootSpec::None => Vec::new().into_iter(),
                 })
                 .collect(),
         }

common/src/generation.rs

@@ -255,12 +255,16 @@ impl EntityInfo {
 
         match loot {
             LootKind::Item(asset) => {
-                self = self.with_loot_drop(Item::new_from_asset_expect(&asset));
+                if let Ok(item) = Item::new_from_asset(&asset) {
+                    self = self.with_loot_drop(item);
+                }
             },
             LootKind::LootTable(asset) => {
-                let table = Lottery::<LootSpec<String>>::load_expect(&asset);
-                let drop = table.read().choose().to_item();
+                if let Ok(table) = Lottery::<LootSpec<String>>::load(&asset) {
+                    if let Some(drop) = table.read().choose().to_item() {
                         self = self.with_loot_drop(drop);
+                    }
+                }
             },
             LootKind::Uninit => {},
         }

common/src/lottery.rs

@@ -84,26 +84,32 @@ pub enum LootSpec<T: AsRef<str>> {
     ItemQuantity(T, u32, u32),
     /// Loot table
     LootTable(T),
+    /// No loot given
+    None,
 }
 
 impl<T: AsRef<str>> LootSpec<T> {
-    pub fn to_item(&self) -> Item {
+    pub fn to_item(&self) -> Option<Item> {
         match self {
-            Self::Item(item) => Item::new_from_asset_expect(item.as_ref()),
+            Self::Item(item) => Item::new_from_asset(item.as_ref()).ok(),
             Self::ItemQuantity(item, lower, upper) => {
                 let range = *lower..=*upper;
                 let quantity = thread_rng().gen_range(range);
-                let mut item = Item::new_from_asset_expect(item.as_ref());
+                if let Ok(mut item) = Item::new_from_asset(item.as_ref()) {
                     // TODO: Handle multiple of an item that is unstackable
                     if item.set_amount(quantity).is_err() {
                         warn!("Tried to set quantity on non stackable item");
                     }
-                item
+                    Some(item)
+                } else {
+                    None
+                }
             },
             Self::LootTable(table) => Lottery::<LootSpec<String>>::load_expect(table.as_ref())
                 .read()
                 .choose()
                 .to_item(),
+            Self::None => None,
         }
     }
 }
@@ -141,6 +147,7 @@ mod tests {
                             Lottery::<LootSpec<String>>::load_expect_cloned(loot_table);
                         validate_table_contents(loot_table);
                     },
+                    LootSpec::None => {},
                 }
             }
         }

server/src/events/entity_manipulation.rs

@@ -529,14 +529,13 @@ pub fn handle_destroy(server: &mut Server, entity: EcsEntity, cause: HealthSourc
             })
         };
 
-        let item = {
+        if let Some(item) = {
             let mut item_drops = state.ecs().write_storage::<comp::ItemDrop>();
             item_drops.remove(entity).map_or_else(
                 || lottery().read().choose().to_item(),
-                |item_drop| item_drop.0,
+                |item_drop| Some(item_drop.0),
             )
-        };
-
+        } {
             let pos = state.ecs().read_storage::<comp::Pos>().get(entity).cloned();
             let vel = state.ecs().read_storage::<comp::Vel>().get(entity).cloned();
             if let Some(pos) = pos {
@@ -565,6 +564,7 @@ pub fn handle_destroy(server: &mut Server, entity: EcsEntity, cause: HealthSourc
                     "Entity doesn't have a position, no bag is being dropped"
                 )
             }
+        }
 
         true
     } else {