From 242bad9a87dbfc8a6af829ee3da3853925be14ab Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@jeremyevans.net>
Date: Thu, 13 May 2021 14:42:00 -0700
Subject: [ruby/reline] Fix Reline::Unicode.calculate_width when input is not a
 TTY

This fixes an error when output is redirected:

```
$ run_ruby -rreline -e '$stderr.puts Reline::Unicode.calculate_width("\u221a").inspect' </dev/null >/dev/null
/home/jeremy/tmp/ruby/lib/reline/ansi.rb:189:in `raw': Operation not supported by device (Errno::ENODEV)
```

The @@encoding -> defined?(@@encoding) changes is necessary because
without that part of the commit, the following error would be raised
by the above command:

```
/home/jeremy/tmp/reline/lib/reline/general_io.rb:10:in `encoding': uninitialized class variable @@encoding in Reline::GeneralIO (NameError)
```

Problem reported and initial patch for Windows provided by
Richard Sharman.

I tested this only on OpenBSD, but hopefully it works for other
operating systems.

Fixes [Bug #17493]

https://github.com/ruby/reline/commit/c001971bb3
---
 lib/reline/general_io.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/reline')

diff --git a/lib/reline/general_io.rb b/lib/reline/general_io.rb
index 4f605628a3..2f87d718c6 100644
--- a/lib/reline/general_io.rb
+++ b/lib/reline/general_io.rb
@@ -7,7 +7,7 @@ class Reline::GeneralIO
   end
 
   def self.encoding
-    if @@encoding
+    if defined?(@@encoding)
       @@encoding
     elsif RUBY_PLATFORM =~ /mswin|mingw/
       Encoding::UTF_8
-- 
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