https://git.ruby-lang.org/ruby.git/commit/?id=c5cbabf8a8

From c5cbabf8a8aa42b7dcf943c64274489286174108 Mon Sep 17 00:00:00 2001
From: NAKAMURA Usaku <usa@r...>
Date: Thu, 23 May 2019 15:33:40 +0900
Subject: Use colorized IRB on Windows without checking `TERM`


diff --git a/lib/irb/color.rb b/lib/irb/color.rb
index 7af7118..eb95da8 100644
--- a/lib/irb/color.rb
+++ b/lib/irb/color.rb
@@ -43,7 +43,7 @@ module IRB # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/irb/color.rb#L43
 
     class << self
       def colorable?
-        $stdout.tty? && ENV.key?('TERM') && ENV['TERM'] != 'dumb'
+        $stdout.tty? && (/mswin|mingw/ =~ RUBY_PLATFORM || (ENV.key?('TERM') && ENV['TERM'] != 'dumb'))
       end
 
       def inspect_colorable?(obj)
-- 
cgit v0.10.2


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