Add commands for diagonal movement

Cribbed directly from Nethack

This was really, really easy.

src/types/command.rs

@@ -23,6 +23,11 @@ impl Command {
             Char('k') | Char('w') | Key::Up => Some(Move(Up)),
             Char('j') | Char('s') | Key::Down => Some(Move(Down)),
             Char('l') | Char('d') | Key::Right => Some(Move(Right)),
+            Char('y') => Some(Move(UpLeft)),
+            Char('u') => Some(Move(UpRight)),
+            Char('b') => Some(Move(DownLeft)),
+            Char('n') => Some(Move(DownRight)),
+
             Ctrl('p') => Some(PreviousMessage),
             _ => None,
         }

src/types/direction.rs

@@ -6,4 +6,8 @@ pub enum Direction {
     Up,
     Down,
     Right,
+    UpLeft,
+    UpRight,
+    DownRight,
+    DownLeft,
 }

src/types/entity_map.rs

@@ -234,10 +234,9 @@ mod tests {
                 em.get(entity_id).map(|e| e.position()),
                 Some(new_position)
             );
-            assert_eq!(
+            assert!(
                 em.at(new_position).iter().map(
-                    |e| e.name.clone()).collect::<Vec<_>>(),
-                vec![ent.name]
+                    |e| e.name.clone()).any(|en| en == ent.name),
             )
         }
 

src/types/mod.rs

@@ -8,7 +8,7 @@ pub mod direction;
 pub mod entity_map;
 pub use collision::Collision;
 pub use direction::Direction;
-pub use direction::Direction::{Down, Left, Right, Up};
+pub use direction::Direction::*;
 use proptest_derive::Arbitrary;
 use termion::cursor;
 
@@ -217,6 +217,10 @@ impl ops::Add<Direction> for Position {
                     self
                 }
             }
+            UpLeft => self + Up + Left,
+            UpRight => self + Up + Right,
+            DownLeft => self + Down + Left,
+            DownRight => self + Down + Right,
         }
     }
 }