From 3cd3f766799eb1e591356acde3ab863e3bb3566a Mon Sep 17 00:00:00 2001
From: Kouhei Yanagita <yanagi@shakenbu.org>
Date: Thu, 9 Jan 2025 11:00:54 +0900
Subject: [PATCH] [ruby/optparse] Fix LESS environment variable setup in
 OptionParser#help_exit

If the original value of LESS ends with an option starting with "--",
simply appending "Fe" would result in an invalid option string.

https://github.com/ruby/optparse/commit/30571f91d3
---
 lib/optparse.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/optparse.rb b/lib/optparse.rb
index f849a9cc97..f32edc5df3 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -1058,7 +1058,7 @@ XXX
   def help_exit
     if $stdout.tty? && (pager = ENV.values_at(*%w[RUBY_PAGER PAGER]).find {|e| e && !e.empty?})
       less = ENV["LESS"]
-      args = [{"LESS" => "#{!less || less.empty? ? '-' : less}Fe"}, pager, "w"]
+      args = [{"LESS" => "#{less} -Fe"}, pager, "w"]
       print = proc do |f|
         f.puts help
       rescue Errno::EPIPE