From 720ef3bd208d64982ea18e89921b05524178ccb6 Mon Sep 17 00:00:00 2001
From: Piotr Murach <pmurach@gmail.com>
Date: Sat, 16 Dec 2023 14:00:12 +0000
Subject: [PATCH] Fix JRuby and Windows system detection to check Ruby
 configuration only once

---
 CHANGELOG.md      |  1 +
 lib/tty/screen.rb | 12 ++++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05ddb05..c0507c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@
 * Fix to skip terminal size detection from readline on non-TTY output
 * Fix size detection from IO to skip loading io-console on non-TTY output
 * Fix size detection from tput to check for non-zero columns instead of lines
+* Fix JRuby and Windows system detection to check Ruby configuration only once
 
 ## [v0.8.1] - 2020-07-17
 
diff --git a/lib/tty/screen.rb b/lib/tty/screen.rb
index 9187ef5..201a44e 100644
--- a/lib/tty/screen.rb
+++ b/lib/tty/screen.rb
@@ -12,13 +12,21 @@ module TTY
   #
   # @api public
   module Screen
+    # The Ruby configuration
+    #
+    # @return [Hash]
+    #
+    # @api private
+    RUBY_CONFIG = defined?(::RbConfig) ? ::RbConfig::CONFIG : {}
+    private_constant :RUBY_CONFIG
+
     # Helper to define private functions
     def self.private_module_function(name)
       module_function(name)
       private_class_method(name)
     end
 
-    case (defined?(::RbConfig) ? ::RbConfig::CONFIG["host_os"] : ::RUBY_PLATFORM)
+    case RUBY_CONFIG["host_os"] || ::RUBY_PLATFORM
     when /mswin|msys|mingw|cygwin|bccwin|wince|emc/
       def windows?; true end
     else
@@ -26,7 +34,7 @@ def windows?; false end
     end
     module_function :windows?
 
-    case (defined?(::RbConfig) ? ::RbConfig::CONFIG["ruby_install_name"] : ::RUBY_ENGINE)
+    case RUBY_CONFIG["ruby_install_name"] || ::RUBY_ENGINE
     when /jruby/
       def jruby?; true end
     else