From c2f159b63f3c013e82ed3e79e9d1fb4a55982cde Mon Sep 17 00:00:00 2001
From: Paul van Tilburg <paul@luon.net>
Date: Wed, 6 Mar 2019 23:03:06 +0100
Subject: [PATCH] Add a flip() helper method for LedDirection; use it

---
 src/main.rs | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 1227f19..3b462e1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -20,6 +20,15 @@ pub enum LedDirection {
     CounterClockwise,
 }
 
+impl LedDirection {
+    fn flip(&self) -> LedDirection {
+        match self {
+            LedDirection::Clockwise => LedDirection::CounterClockwise,
+            LedDirection::CounterClockwise => LedDirection::Clockwise,
+        }
+    }
+}
+
 #[app(device = hal::stm32)]
 const APP: () = {
     static mut button: UserButton = ();
@@ -68,10 +77,8 @@ const APP: () = {
 
     #[interrupt(binds = EXTI0, resources = [button, exti, led_cycle_direction])]
     fn button_pressed() {
-        *resources.led_cycle_direction = match *resources.led_cycle_direction {
-            LedDirection::Clockwise => LedDirection::CounterClockwise,
-            LedDirection::CounterClockwise => LedDirection::Clockwise,
-        };
+        *resources.led_cycle_direction = resources.led_cycle_direction.flip();
+
         resources.button.clear_interrupt_pending_bit(resources.exti);
     }