class Gem::Commands::SetupCommand

def show_release_notes
  release_notes = File.join Dir.pwd, 'History.txt'
  release_notes =
    if File.exist? release_notes then
      history = File.read release_notes
      history.force_encoding Encoding::UTF_8 if
        Object.const_defined? :Encoding
      history = history.sub(/^# coding:.*?(?=^=)/m, '')
      text = history.split(HISTORY_HEADER)
      text.shift # correct an off-by-one generated by split
      version_lines = history.scan(HISTORY_HEADER)
      versions = history.scan(VERSION_MATCHER).flatten.map do |x|
        Gem::Version.new(x)
      end
      history_string = ""
      until versions.length == 0 or
            versions.shift < options[:previous_version] do
        history_string += version_lines.shift + text.shift
      end
      history_string
    else
      "Oh-no! Unable to find release notes!"
    end
  say release_notes
end