ruby macports readline irb ruby-enterprise-edition

Pasting text into IRB is incredibly slow. Readline issue?

When I paste the following text into IRB or PRY running under ruby-enterprise-2011.03, it takes 13 seconds.

# Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

Pasting isn't slow when running irb with other ruby installations on the same computer.

  jruby-1.5.6
  jruby-1.6.3
  ruby-1.8.6-p420
  ruby-1.8.7-p352
  ruby-1.9.1-p431
  ruby-1.9.2-p290
  ruby-1.9.3-preview1
  or Mac OS X's default system install of 1.8.7-p249

This question is related to Rails console running incredibly slowly when editing text, but I'm not using rvm, and there is no slowness when writing, editing, or deleting text; Only pasting is slow. @fl00r's suggestion works, but that isn't a permanent fix.

Also, if there are hard newlines in the pasted text, only the last line is slow. For example, pasting the following text only takes about 1.5 seconds

# Lorem ipsum dolor sit amet, consectetur adipisicing elit, 
# sed do eiusmod tempor incididunt ut labore et dolore magna 
# aliqua.

I've noticed that REE loads a copy of libreadline that none of the other ruby installations load. Is there a way to configure and compile REE to ignore the libreadline file from MacPorts?

require 'readline'
puts `lsof -p #{$$} | grep -i readline | awk '{print $9}'`
puts

I ran the above script on several ruby installations. Only the bottom 2 installations (the REE installations) include the extra libreadline.

=== ruby-1.8.6-p36 ======================
/opt/ruby-1.8.6-p36/lib/ruby/1.8/i686-darwin11.2.0/readline.bundle

=== ruby-1.8.6-p420 ======================
/opt/ruby-1.8.6-p420/lib/ruby/1.8/i686-darwin11.0.1/readline.bundle

=== ruby-1.8.7-p352 ======================
/opt/ruby-1.8.7-p352/lib/ruby/1.8/i686-darwin11.0.1/readline.bundle

=== ruby-1.9.1-p431 ======================
/opt/ruby-1.9.1-p431/lib/ruby/1.9.1/i386-darwin11.0.1/readline.bundle

=== ruby-1.9.2-p290 ======================
/opt/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin11.0.1/readline.bundle

=== ruby-1.9.3-preview1 ==================
/opt/ruby-1.9.3-preview1/lib/ruby/1.9.1/x86_64-darwin11.0.1/readline.bundle

=== ruby-enterprise-1.8.7-2011.03 ========
/opt/ruby-enterprise-1.8.7-2011.03/lib/ruby/1.8/i686-darwin11.0.1/readline.bundle
/opt/local/lib/libreadline.6.2.dylib

=== ruby-enterprise-1.8.7-2012.01 ========
/opt/ruby-enterprise-1.8.7-2012.01/lib/ruby/1.8/i686-darwin11.2.0/readline.bundle
/opt/local/lib/libreadline.6.2.dylib

Solution

It looks like REE's installer.rb adds -I/opt/local/include and -L/opt/local/lib -Wl, linker flags. After clearing out those flags, REE compiles successfully without including the 2nd readline library, but the resultant ruby will not execute due to other load errors.

A solution is to temporarily remove MacPorts while installing REE so that it doesn't link to the extra readline library.

Quit all processes that are accessing MacPorts files. You can see which ones are running with sudo lsof | grep /opt/local.
sudo mv /opt/local /opt/localbak
Open a new terminal, then compile and install REE
sudo mv /opt/localbak /opt/local

After that, the REE installation will work properly alongside MacPorts.