From 671f2762fb8a4832d2c17322ee600f53c91f76f5 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@gmail.com>
Date: Fri, 18 Dec 2020 22:25:09 +0900
Subject: [PATCH] [ruby/reline] Add Enumerable to KillRing for debugging

https://github.com/ruby/reline/commit/d208874152
---
 lib/reline/kill_ring.rb       | 12 ++++++++++++
 test/reline/test_kill_ring.rb | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/lib/reline/kill_ring.rb b/lib/reline/kill_ring.rb
index 842fd04697..bb3684b42b 100644
--- a/lib/reline/kill_ring.rb
+++ b/lib/reline/kill_ring.rb
@@ -1,4 +1,6 @@
 class Reline::KillRing
+  include Enumerable
+
   module State
     FRESH = :fresh
     CONTINUED = :continued
@@ -110,4 +112,14 @@ class Reline::KillRing
       nil
     end
   end
+
+  def each
+    start = head = @ring.head
+    loop do
+      break if head.nil?
+      yield head.str
+      head = head.backward
+      break if head == start
+    end
+  end
 end
diff --git a/test/reline/test_kill_ring.rb b/test/reline/test_kill_ring.rb
index 8bebfe2177..9f6e0c3e74 100644
--- a/test/reline/test_kill_ring.rb
+++ b/test/reline/test_kill_ring.rb
@@ -253,4 +253,16 @@ class Reline::KillRing::Test < Reline::TestCase
     assert_equal(['AB', 'abcde'], @kill_ring.yank_pop)
     assert_equal(Reline::KillRing::State::YANK, @kill_ring.instance_variable_get(:@state))
   end
+
+  def test_enumerable
+    @kill_ring.append('a')
+    @kill_ring.process
+    @kill_ring.process
+    @kill_ring.append('b')
+    @kill_ring.process
+    @kill_ring.process
+    @kill_ring.append('c')
+    @kill_ring.process
+    assert_equal(%w{c b a}, @kill_ring.to_a)
+  end
 end