From: "noniq (Stefan Daschek)" <stefan@...>
Date: 2013-12-05T01:54:38+09:00
Subject: [ruby-core:58857] [ruby-trunk - Bug #9204] Issues when compiled	with libedit instead of readline


Issue #9204 has been updated by noniq (Stefan Daschek).


Indeed, but unfortunately it���s a badly documented choice with rather surprising consequences: Compiling Ruby works seemingly without any problems, and you may use Ruby for several days or even months before noticing the issue. And then it���s quite hard to find out that this has something todo with the way you initially compiled Ruby.

Could there at least be a big warning when compiling with libedit, saying something like ���Warning: This build uses libedit instead of readline. You will not be able to use accented characters in irb.���? Dave Thomas already suggested this back in 2009: http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/21277

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Bug #9204: Issues when compiled with libedit instead of readline
https://bugs.ruby-lang.org/issues/9204#change-43413

Author: noniq (Stefan Daschek)
Status: Third Party's Issue
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 2.1.0dev (2013-11-23 trunk 43807) [x86_64-darwin13.0
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


Compiling Ruby on Mac OS X uses BSD libedit instead of GNU readline, leading to various problems. Most notably: With libedit it���s not possible to input accented characters (e.g. ������) in irb or pry:
  
 $ irb # Ruby 2.1.0-preview2
 irb(main):001:0> "a \U+FFC3\U+FFA4" # typing 'a ��' results in this weird escape sequence
 => "a "

This issue has already been mentioned on ruby-core in 2009, but with no apparent result: http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/21259

This shows up quite often, usually it���s suggested to manually install GNU readline before compiling Ruby (and making sure readline is actually found and used when configuring / compiling):

https://github.com/guard/guard/wiki/Add-Readline-support-to-Ruby-on-Mac-OS-X
https://github.com/wayneeseguin/rvm/issues/1016
http://jorgebernal.info/2009/11/18/fixing-snow-leopard-ruby-readline/

Maybe Ruby could bundle readline to avoid this kind of issues? 


-- 
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