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Bond, a gem to improve irb’s autocompletion, just hit version 0.2.0. With this version comes a completion configuration system similar to bash/zsh, more fixes to irb’s incorrect completions and most importantly, any method can have its arguments autocompleted! The screencast demonstrates most of this.

Screencast

Bond – Argument Autocompletion for Methods in Irb from cldwalker.

Screencast Notes

• Bond.list_methods: Lists all methods (80+) that have argument autocompletion.
• Examples of methods with argument completion: Kernel#require, Array#delete, Hash#[], Module#const_get, Object#instance_variable_get
• Object#send: Exemplifies an argument completion that varies per argument. Can be used to invoke argument completions for private methods.
• Rails examples: ActiveRecord::Base.attr_accessible, ActiveRecord::Base.create, ActiveRecord::Base.where, ActiveRecord::Base.all
• Basic argument completion example: Bond.complete(:method=>"Array#jump") { %w{foo bar baz} }

Install

Install the gem with:

    sudo gem install bond

In your irbrc, replace irb’s completion (require ‘irb/completion’) with :

  require 'bond'
  Bond.start
  #Bond.start replaces require 'bond/completion' from previous bond versions

If using wirble, place the above after wirble.

Further Reading

• The README contains a thorough introduction to Bond and a section on irb’s incorrect autocompletions.
• Official documentation
• Official homepage