gistfile1.rb

# Giles Bowkett, Greg Brown, and several audience members from Giles' Ruby East presentation.
# hacked a touch by mpd to work with modern distributions.

require 'tempfile'

class InteractiveEditor
  attr_accessor :editor
  def initialize(editor = :vim)
    @editor = editor.to_s
    if @editor == "mate"
      @editor = "mate -w"
    end
  end
  def edit
    @file ||= Tempfile.new("irb_tempfile")
    system("#{@editor} #{@file.path}")
    execute
  end
  def execute
    @file.open
    @file.rewind
    Object.class_eval(@file.read)
  end
end