Friday, April 25, 2014

Get rid of the DL deprecated message from Pry and IRB in Ruby 2.0 on Windows

It's a commonly known fact that in Ruby 2.0 on Windows, Pry and IRB display the infamous message DL is deprecated, please use Fiddle. This can get annoying after some time. If you really want to remove this message, I found a method to do it and it's actually very simple.

Start off by installing the rb-readline gem, by Luis Lavena, of RubyInstaller fame:

gem install rb-readline

This is a pure ruby implementation of Readline that doesn't require DL.

Let's start with Pry. First, open or create your .pryrc file. I'm not going to explain what the file is. You can find that information here. The file should be in %HOMEDRIVE%%HOMEPATH%. If it isn't, then you need to create one through the command prompt, since Windows Explorer doesn't like creating files that start with a dot. This command will create an empty .pryrc file from the command prompt for you:

echo. 2> %HOMEDRIVE%%HOMEPATH%\.pryrc

Editing the file, include the following:

gem 'rb-readline'

Now, if you open Pry the message is gone. Victory!

Unfortunately, .irbrc doesn't work the same way that .pryrc does. IRB actually loads .irbrc only after requiring readline, but if you don't mind editing code that came with Ruby, then follow on.

Go to the bin directory of your Ruby installation, and open the irb file (not the irb.bat file), and add the same gem line from above, before require "irb":

gem 'rb-readline'

If you open IRB the message is gone.

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