curses_with_nontty_stdout.rb

require 'curses'

def ensure_stdout_isatty
  isatty = STDOUT.isatty

  unless isatty
    stdout_old = STDOUT.dup
    STDOUT.reopen('/dev/tty')
  end

  yield

  unless isatty
    STDOUT.flush
    STDOUT.reopen stdout_old
  end
end

ensure_stdout_isatty do
  begin
    Curses.init_screen

    Curses.setpos(Curses.lines / 2, Curses.cols / 2 - ("Hello".length / 2))
    Curses.addstr("Hello")
    Curses.refresh
    Curses.getch
  ensure
    Curses.close_screen
  end
end

STDOUT.puts "Hello"