module Thor::Shell::Terminal

def dynamic_width
  @dynamic_width ||= (dynamic_width_stty.nonzero? || dynamic_width_tput)
end

def dynamic_width_stty
  `stty size 2>/dev/null`.split[1].to_i
end

def dynamic_width_tput
  `tput cols 2>/dev/null`.to_i
end

def terminal_width
  result = if ENV["THOR_COLUMNS"]
    ENV["THOR_COLUMNS"].to_i
  else
    unix? ? dynamic_width : DEFAULT_TERMINAL_WIDTH
  end
  result < 10 ? DEFAULT_TERMINAL_WIDTH : result
rescue
  DEFAULT_TERMINAL_WIDTH
end

def unix?
  RUBY_PLATFORM =~ /(aix|darwin|linux|(net|free|open)bsd|cygwin|solaris)/i
end