File: with_term.rb

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require 'stringio'

module Helper
  module WithTerm
    def with_sio(tty: true)
      sio = StringIO.new
      def sio.tty?; true; end if tty

      result = yield(sio)
      sio.close

      [result, sio.string]
    end

    def with_term(tty=true)
      with_sio(tty: tty) do |sio|
        begin
          orig_stdout, $stdout = $stdout, sio
          orig_env = ENV.to_h.dup
          ENV['TERM'] = 'xterm-256color'
          yield
        ensure
          $stdout = orig_stdout
          ENV.replace(orig_env) if orig_env
        end
      end
    end
  end
end