friend_completion.rb

module Earthquake::Input
  def friends
    @friends ||= []
  end
end

Earthquake.init do
  output :friend_completion do |item|
    next unless item["user"]
    (friends << "@#{item["user"]["screen_name"]}").uniq!
  end

  input_filter do |text|
    text.scan(/@[0-9A-Za-z_]+/) do |screen_name|
      (friends << screen_name).uniq!
    end
  end

  Readline.basic_word_break_characters = Readline.basic_word_break_characters.delete("@")
  completion_proc = Readline.completion_proc
  Readline.completion_proc = lambda do |text|
    case text
    when /^@/
      friends.grep(/^#{text}/)
    else
      completion_proc.call(text)
    end
  end
end