Make ModTap into a tuple struct

src/button.rs

@@ -26,7 +26,7 @@ impl From<Modifier> for u8 {
 pub enum Button {
     Mod(Modifier),
     Key(Key),
-    ModTap { keycode: Key, modifier: Modifier },
+    ModTap(Key, Modifier),
     NextLayer,
     PrevLayer,
     None,
@@ -36,11 +36,28 @@ impl Display for Button {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Button::Mod(modifier) => Debug::fmt(&modifier, f),
-            Button::Key(keycode) => write!(f, "{keycode:?}"),
-            Button::ModTap { keycode, modifier } => write!(f, "{keycode:?}/{modifier:?}"),
+            Button::Key(key) => write!(f, "{key:?}"),
+            Button::ModTap(key, modifier) => write!(f, "{key:?}/{modifier}"),
             Button::NextLayer => write!(f, "↘"),
             Button::PrevLayer => write!(f, "↖"),
             Button::None => write!(f, "Ø"),
         }
     }
 }
+
+impl Display for Modifier {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let s = match self {
+            Modifier::LCtrl => "⎈",
+            Modifier::LShift => "⇧",
+            Modifier::LAlt => "⎇",
+            Modifier::LMod => "◆",
+            Modifier::RCtrl => "⎈",
+            Modifier::RShift => "⇧",
+            Modifier::RAlt => "⎇",
+            Modifier::RMod => "◆",
+        };
+
+        write!(f, "{s}")
+    }
+}