https://git.ruby-lang.org/ruby.git/commit/?id=0862744010

From 0862744010907ecda8c8122557e97de9238d51a1 Mon Sep 17 00:00:00 2001
From: Yoshinao Muramatu <ysno@a...>
Date: Mon, 10 Aug 2020 11:01:05 +0900
Subject: [ruby/reline] clear_screen use Windows API

https://github.com/ruby/reline/commit/2c5ee54cb3

diff --git a/lib/reline/windows.rb b/lib/reline/windows.rb
index c229c85..6459daa 100644
--- a/lib/reline/windows.rb
+++ b/lib/reline/windows.rb
@@ -92,6 +92,7 @@ class Reline::Windows https://github.com/ruby/ruby/blob/trunk/lib/reline/windows.rb#L92
   @@ReadConsoleInput = Win32API.new('kernel32', 'ReadConsoleInput', ['L', 'P', 'L', 'P'], 'L')
   @@GetFileType = Win32API.new('kernel32', 'GetFileType', ['L'], 'L')
   @@GetFileInformationByHandleEx = Win32API.new('kernel32', 'GetFileInformationByHandleEx', ['L', 'I', 'P', 'L'], 'I')
+  @@FillConsoleOutputAttribute = Win32API.new('kernel32', 'FillConsoleOutputAttribute', ['L', 'L', 'L', 'L', 'P'], 'L')
 
   @@input_buf = []
   @@output_buf = []
@@ -249,9 +250,15 @@ class Reline::Windows https://github.com/ruby/ruby/blob/trunk/lib/reline/windows.rb#L250
   end
 
   def self.clear_screen
-    # TODO: Use FillConsoleOutputCharacter and FillConsoleOutputAttribute
-    write "\e[2J"
-    write "\e[1;1H"
+    coord_screen_top_left = 0
+    written = 0.chr * 4
+    csbi = 0.chr * 22
+    return if @@GetConsoleScreenBufferInfo.call(@@hConsoleHandle, csbi) == 0
+    con_size = csbi[0, 4].unpack('SS').inject(:*)
+    attributes = csbi[8, 2].unpack('S').first
+    @@FillConsoleOutputCharacter.call(@@hConsoleHandle, 0x20, con_size, coord_screen_top_left, written)
+    @@FillConsoleOutputAttribute.call(@@hConsoleHandle, attributes, con_size, coord_screen_top_left, written)
+    @@SetConsoleCursorPosition.call(@@hConsoleHandle, coord_screen_top_left)
   end
 
   def self.set_screen_size(rows, columns)
-- 
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