From a5e6c4c1452fa7ec889f4ba1ad50f38b5a754cca Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Mon, 7 Dec 2020 18:31:33 -0800
Subject: [PATCH] Add utility to draw the state of a hash.

---
 src/advent/util.cr | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/advent/util.cr b/src/advent/util.cr
index 00acd6b..e99fd0a 100644
--- a/src/advent/util.cr
+++ b/src/advent/util.cr
@@ -54,6 +54,9 @@ struct Tuple(*T)
       { {% for t, i in T %} self[{{i}}].signum, {% end %} }
     {% end %}
   end
+
+  def abs
+  end
 end
 
 struct Number
@@ -62,3 +65,17 @@ struct Number
     self // self.abs
   end
 end
+
+class Hash(K, V)
+  def draw(maps)
+    min_x, max_x = keys.minmax_of &.[0]
+    min_y, max_y = keys.minmax_of &.[1]
+    (max_y-min_y+1).times do |y|
+      (max_x-min_x+1).times do |x|
+        next unless has_key?({x,y})
+        print maps[self[{x,y}]]
+      end
+      puts
+    end
+  end
+end