How to enable auto completion in Ruby's IRB

Question

When I use Merb\'s built in console, I get tab auto-completion similar to a standard bash prompt. I find this useful and would like to enable it in non-merb IRB sessions. How

Answer 1

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