How to enable auto completion in Ruby's IRB

Solution 1:

Just drop require 'irb/completion' in your irbrc.

If that doesn't work try bond, http://tagaholic.me/bond/:

   require 'bond'; require 'bond/completion'

Bond not only improves irb's completion, http://tagaholic.me/2009/07/22/better-irb-completion-with-bond.html, but also offers an easy dsl for making custom autocompletions.

Solution 2:

This is just repeating the information on Cody Caughlan's comment above so it is easier to find:

either require 'irb/completion' or add the following to ~/.irbrc

IRB.conf[:AUTO_INDENT] = true
IRB.conf[:USE_READLINE] = true
IRB.conf[:LOAD_MODULES] = [] unless IRB.conf.key?(:LOAD_MODULES)
unless IRB.conf[:LOAD_MODULES].include?('irb/completion')
  IRB.conf[:LOAD_MODULES] << 'irb/completion'
end