From 337ba56aff37d34896c0dd091f1bcfb4a556126b Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@ruby-lang.org>
Date: Sun, 29 Dec 2019 09:01:00 +0900
Subject: [ruby/reline] Degenerate the terminal size to [$LINES, $COLUMNS] if
 it is unknown

This is a workaround for https://github.com/ruby/irb/issues/50

https://github.com/ruby/reline/commit/5725677d1a
---
 lib/reline/ansi.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lib/reline/ansi.rb')

diff --git a/lib/reline/ansi.rb b/lib/reline/ansi.rb
index 8d83da854c..27157f0db9 100644
--- a/lib/reline/ansi.rb
+++ b/lib/reline/ansi.rb
@@ -50,7 +50,11 @@ class Reline::ANSI
   end
 
   def self.get_screen_size
-    @@input.winsize
+    s = @@input.winsize
+    return s if s[0] > 0 && s[1] > 0
+    s = [ENV["LINES"].to_i, ENV["COLUMNS"].to_i]
+    return s if s[0] > 0 && s[1] > 0
+    [24, 80]
   rescue Errno::ENOTTY
     [24, 80]
   end
-- 
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