From caef2ddaaf4a121272ad5c11d046ff4511c0f560 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@gmail.com>
Date: Mon, 13 May 2019 03:26:10 +0900
Subject: [PATCH] Implement Reline::HISTORY as an expanded Array

---
 lib/reline.rb        | 37 ++++++++++++++++++++++++++++++++++++-
 lib/reline/config.rb |  2 ++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/lib/reline.rb b/lib/reline.rb
index 9773f5cb3b..2639021863 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -9,7 +9,6 @@ module Reline
   extend self
   FILENAME_COMPLETION_PROC = nil
   USERNAME_COMPLETION_PROC = nil
-  HISTORY = Array.new
 
   if RUBY_PLATFORM =~ /mswin|mingw/
     IS_WINDOWS = true
@@ -33,6 +32,42 @@ module Reline
   @@line_editor = Reline::LineEditor.new(@@config)
   @@ambiguous_width = nil
 
+  HISTORY = Class.new(Array) {
+    def to_s
+      'HISTORY'
+    end
+
+    def delete_at(index)
+      index = check_index(index)
+      super(index)
+    end
+
+    def [](index)
+      index = check_index(index)
+      super(index)
+    end
+
+    def []=(index, val)
+      index = check_index(index)
+      super(index, String.new(val, encoding: Encoding::default_external))
+    end
+
+    def push(*val)
+      super(*(val.map{ |v| String.new(v, encoding: Encoding::default_external) }))
+    end
+
+    def <<(val)
+      super(String.new(val, encoding: Encoding::default_external))
+    end
+
+    private def check_index(index)
+      index += size if index < 0
+      raise RangeError.new("index=<#{index}>") if index < -@@config.history_size or @@config.history_size < index
+      raise IndexError.new("index=<#{index}>") if index < 0 or size <= index
+      index
+    end
+  }.new
+
   @basic_quote_characters = '"\''
   # TODO implement below
   #@completer_quote_characters
diff --git a/lib/reline/config.rb b/lib/reline/config.rb
index 0a6a92fee2..a140959ca9 100644
--- a/lib/reline/config.rb
+++ b/lib/reline/config.rb
@@ -13,6 +13,7 @@ class Reline::Config
     enable-keypad
     expand-tilde
     history-preserve-point
+    history-size
     horizontal-scroll-mode
     input-meta
     mark-directories
@@ -42,6 +43,7 @@ class Reline::Config
     @key_actors[:emacs] = Reline::KeyActor::Emacs.new
     @key_actors[:vi_insert] = Reline::KeyActor::ViInsert.new
     @key_actors[:vi_command] = Reline::KeyActor::ViCommand.new
+    @history_size = 500
   end
 
   def reset