From 78559b989e500311e38a54679fd205fe4af74342 Mon Sep 17 00:00:00 2001
From: kojix2 <2xijok@gmail.com>
Date: Mon, 3 Aug 2020 10:44:49 +0900
Subject: [PATCH] Add tally method for older rubies

---
 lib/uplot/command.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/uplot/command.rb b/lib/uplot/command.rb
index 415d818..53743ea 100644
--- a/lib/uplot/command.rb
+++ b/lib/uplot/command.rb
@@ -205,3 +205,14 @@ module Uplot
     end
   end
 end
+
+# backports
+# https://github.com/marcandre/backports/blob/master/lib/backports/2.7.0/enumerable/tally.rb
+unless Enumerable.method_defined? :tally
+  module Enumerable
+    def tally
+      # NB: By spec, tally should return default-less hash
+      each_with_object(Hash.new(0)) { |item, res| res[item] += 1 }.tap { |h| h.default = nil }
+    end
+  end
+end