Adding backwards exits

Author: Tomasz Sterna

src/map/themes.rs

@@ -42,6 +42,10 @@ fn get_tile_glyph_default(idx: usize, map: &Map) -> (FontCharType, RGB, RGB) {
             glyph = rltk::to_cp437('>');
             fg = RGB::from_f32(0.0, 1.0, 1.0);
         }
+        TileType::UpStairs => {
+            glyph = rltk::to_cp437('<');
+            fg = RGB::from_f32(0.0, 1.0, 1.0);
+        }
         TileType::Bridge => {
             glyph = rltk::to_cp437('▒');
             fg = RGB::named(rltk::CHOCOLATE);

src/map/tile_type.rs

@@ -12,12 +12,14 @@ pub enum TileType {
     WoodFloor,
     Bridge,
     Gravel,
+    UpStairs,
 }
 
 pub fn tile_walkable(tt: TileType) -> bool {
     match tt {
         TileType::Floor
         | TileType::DownStairs
+        | TileType::UpStairs
         | TileType::Road
         | TileType::Grass
         | TileType::ShallowWater
@@ -33,6 +35,7 @@ pub fn tile_opaque(tt: TileType) -> bool {
         TileType::Wall => true,
         TileType::Floor
         | TileType::DownStairs
+        | TileType::UpStairs
         | TileType::Road
         | TileType::Grass
         | TileType::ShallowWater
@@ -51,6 +54,7 @@ pub fn tile_cost(tt: TileType) -> f32 {
         TileType::Wall
         | TileType::Floor
         | TileType::DownStairs
+        | TileType::UpStairs
         | TileType::DeepWater
         | TileType::WoodFloor
         | TileType::Bridge