Edit ruby string by the editor.

edit.rb

# editor.rb
#
# $ irb -reditor
# > Editor.edit("abc") # Edit "abc" with the external editor.
# => "abc has changed"
#
# Author: @nanki / nanki at dotswitch dot net

require 'tempfile'

module Editor
  def edit(string='', editor = ENV["EDITOR"] || "vim -b")
    begin
      tmp = Tempfile.open(%w(editor .tmp))
      tmp.write string
      tmp.close

      if system([editor, tmp.path].join(' '))
        tmp.open.read.force_encoding(string.encoding)
      else
        string
      end
    ensure
      tmp.close!
    end
  end

  class << self
    include Editor
  end
end