From 4f460ef4a040ae0f144660ef2aceb469de196510 Mon Sep 17 00:00:00 2001
From: Jared Folkins <jfolkins@gmail.com>
Date: Tue, 8 Mar 2016 17:52:36 -0800
Subject: enhc: prevent player from immediately reversing into their own trail

---
 game.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/game.go b/game.go
index 209b776..f51b726 100644
--- a/game.go
+++ b/game.go
@@ -178,24 +178,36 @@ func (p *Player) calculateScore(delta float64, playerCount int) float64 {
 }
 
 func (p *Player) HandleUp() {
+	if p.Direction == PlayerDown {
+		return
+	}
 	p.Direction = PlayerUp
 	p.Marker = playerUpRune
 	p.s.didAction()
 }
 
 func (p *Player) HandleLeft() {
+	if p.Direction == PlayerRight {
+		return
+	}
 	p.Direction = PlayerLeft
 	p.Marker = playerLeftRune
 	p.s.didAction()
 }
 
 func (p *Player) HandleDown() {
+	if p.Direction == PlayerUp {
+		return
+	}
 	p.Direction = PlayerDown
 	p.Marker = playerDownRune
 	p.s.didAction()
 }
 
 func (p *Player) HandleRight() {
+	if p.Direction == PlayerLeft {
+		return
+	}
 	p.Direction = PlayerRight
 	p.Marker = playerRightRune
 	p.s.didAction()
-- 
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