https://git.ruby-lang.org/ruby.git/commit/?id=eac347fdb0

From eac347fdb04023e1a365d84a8c163263cc7a5904 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Tue, 30 Nov 2021 11:42:06 +0900
Subject: lib/pp.rb (PP.pp): Use io/console's winsize by default

[Feature #12913]
---
 lib/pp.rb | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/pp.rb b/lib/pp.rb
index 72480e53047..c164110508a 100644
--- a/lib/pp.rb
+++ b/lib/pp.rb
@@ -61,6 +61,15 @@ require 'prettyprint' https://github.com/ruby/ruby/blob/trunk/lib/pp.rb#L61
 # Tanaka Akira <akr@f...>
 
 class PP < PrettyPrint
+  def PP.width_for(out)
+    begin
+      require 'io/console'
+      _, width = out.winsize
+    rescue LoadError, NoMethodError, Errno::ENOTTY
+    end
+    (width || ENV['COLUMNS']&.to_i&.nonzero? || 80) - 1
+  end
+
   # Outputs +obj+ to +out+ in pretty printed format of
   # +width+ columns in width.
   #
@@ -68,7 +77,7 @@ class PP < PrettyPrint https://github.com/ruby/ruby/blob/trunk/lib/pp.rb#L77
   # If +width+ is omitted, 79 is assumed.
   #
   # PP.pp returns +out+.
-  def PP.pp(obj, out=$>, width=79)
+  def PP.pp(obj, out=$>, width=width_for(out))
     q = PP.new(out, width)
     q.guard_inspect_key {q.pp obj}
     q.flush
-- 
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