class TTY::Color::Support

def disabled?
  no_color = @env["NO_COLOR"]
  !(no_color.nil? || no_color.empty?)
end

def from_curses(curses_class = nil)
  return NoValue if TTY::Color.windows?
  require "curses"
  if defined?(Curses)
    curses_class ||= Curses
    curses_class.init_screen
    has_color = curses_class.has_colors?
    curses_class.close_screen
    return has_color
  end
  NoValue
rescue LoadError
  warn "no native curses support" if @verbose
  NoValue
end

def from_env
  ENV_VARS.any? { |key| @env.key?(key) } || NoValue
end

def from_term
  case @env["TERM"]
  when "dumb" then false
  when TERM_REGEX then true
  else NoValue
  end
end

def from_tput
  return NoValue unless TTY::Color.command?("tput colors")
  `tput colors 2>/dev/null`.to_i > 2
rescue Errno::ENOENT
  NoValue
end

def initialize(env, verbose: false)
  @env = env
  @verbose = verbose
end

def support?
  return false unless TTY::Color.tty?
  return false if disabled?
  value = false
  SOURCES.each do |from_check|
    break if (value = public_send(from_check)) != NoValue
  end
  value == NoValue ? false : value
end