From: Jens Wille <jens.wille@...>
Date: 2008-10-20T22:33:34+09:00
Subject: Re: Best Command Prompt

hi trans!

Trans [2008-10-20 15:23]:
> I've been using wirble which improves irb a bit (although I hate that
> it doesn't allow duplicate entries in the history --anyone know how to
> fix?).
i always hated that it would store history entries in oldest-first
order. so i just copied the code for save_history from wirble.rb
into my .irbrc and adjusted it accordingly:

  require 'wirble'

  # save history newest-first, instead of default oldest-first
  class Wirble::History
    def save_history
      return unless Object.const_defined? :IRB

      path, max_size, perms = %w{path size perms}.map { |v| cfg(v) }

      # read lines from history, and truncate the list (if necessary)
      #lines = Readline::HISTORY.to_a.uniq
      lines = Readline::HISTORY.to_a.reverse.uniq.reverse
      lines = lines[-max_size..-1] if lines.size > max_size

      # write the history file
      real_path = File.expand_path(path)
      File.open(real_path, perms) { |fh| fh.puts lines }
      say 'Saved %d lines to history file %s.' % [lines.size, path]
    end
  end

you could simply change the line that fills the 'lines' array to
something like this:

      lines = Readline::HISTORY.to_a

cheers
jens