Add new mushroom-based level

src/map_builders.rs

@@ -360,6 +360,7 @@ pub fn level_builder(
         5 => limestone_transition_builder(new_depth, rng, width, height),
         6 => dwarf_fort_builder(new_depth, rng, width, height),
         7 => mushroom_entrance(new_depth, rng, width, height),
+        8 => mushroom_builder(new_depth, rng, width, height),
         _ => random_builder(new_depth, rng, width, height),
     }
 }

src/map_builders/mushroom_forest.rs

@@ -24,3 +24,22 @@ pub fn mushroom_entrance(
 
     chain
 }
+
+pub fn mushroom_builder(
+    new_depth: i32,
+    _rng: &mut ::rltk::RandomNumberGenerator,
+    width: i32,
+    height: i32,
+) -> BuilderChain {
+    let mut chain = BuilderChain::new(new_depth, width, height, "Into the Mushroom Grove");
+    chain
+        .start_with(CellularAutomataBuilder::new())
+        .with(WaveformCollapseBuilder::new())
+        .with(AreaStartingPosition::new(XStart::Center, YStart::Center))
+        .with(CullUnreachable::new())
+        .with(AreaStartingPosition::new(XStart::Right, YStart::Center))
+        .with(AreaEndingPosition::new(XEnd::Left, YEnd::Center))
+        .with(VoronoiSpawning::new());
+
+    chain
+}