1 files changed, 72 insertions, 0 deletions
diff --git a/src/entities/util.rs b/src/entities/util.rs
new file mode 100644
index 000000000000..6c11ffadf994
--- /dev/null
+++ b/src/entities/util.rs
@@ -0,0 +1,72 @@
+#[macro_export]
+macro_rules! new_entity {
+    ($name: ident) => {
+        new_entity!($name, {})
+    };
+
+    ($name: ident { position: $position:expr $(, $fields:tt)* }) => {
+        $name {
+            id: None,
+            position: $position,
+            $($fields)*
+        }
+    };
+
+    ($name: ident { $position:expr $(, $fields:tt)* }) => {
+        $name {
+            id: None,
+            position: $position,
+            $($fields)*
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! boring_entity {
+    ($name:ident) => {
+        entity! {
+            pub struct $name {}
+        }
+
+        impl $name {
+            #[allow(dead_code)]
+            pub fn new(position: $crate::types::Position) -> Self {
+                $name { id: None, position }
+            }
+        }
+    };
+
+    ($name:ident, char: $char: expr) => {
+        boring_entity!($name);
+
+        impl $crate::display::Draw for $name {
+            fn do_draw(&self, out: &mut Write) -> io::Result<()> {
+                write!(out, "{}", $char)
+            }
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! entity {
+    ($name: ident) => {
+        positioned!($name);
+        positioned_mut!($name);
+        identified!($name, $crate::entities::EntityID);
+        impl $crate::entities::entity::Entity for $name {}
+    };
+
+    (pub struct $name:ident { $($struct_contents:tt)* } $($rest:tt)*) => {
+        #[derive(Debug, PartialEq, Eq, Clone)]
+        pub struct $name {
+            pub id: Option<$crate::entities::EntityID>,
+            pub position: $crate::types::Position,
+            $($struct_contents)*
+        }
+
+        entity!($name);
+        entity!($($rest)*);
+    };
+
+    () => {};
+}