old_contents: from __future__ import unicode_literals
  
  import os
  import sys
  
  terminal_supports_color = True
  if os.name == 'nt':  # pragma: no cover (windows)
      from pre_commit.color_windows import enable_virtual_terminal_processing
      try:
          enable_virtual_terminal_processing()
      except WindowsError:
          terminal_supports_color = False
  
  RED = '\033[41m'
  GREEN = '\033[42m'
  YELLOW = '\033[43;30m'
  TURQUOISE = '\033[46;30m'
  NORMAL = '\033[0m'
  
  
  class InvalidColorSetting(ValueError):
      pass
  
  
  def format_color(text, color, use_color_setting):
      """Format text with color.
  
      Args:
          text - Text to be formatted with color if `use_color`
          color - The color start string
          use_color_setting - Whether or not to color
      """
      if not use_color_setting:
          return text
      else:
          return '{}{}{}'.format(color, text, NORMAL)
  
  
  COLOR_CHOICES = ('auto', 'always', 'never')
  
  
  def use_color(setting):
      """Choose whether to use color based on the command argument.
  
      Args:
          setting - Either `auto`, `always`, or `never`
      """
      if setting not in COLOR_CHOICES:
          raise InvalidColorSetting(setting)
  
      if 'NO_COLOR' in os.environ and os.environ['NO_COLOR']:
          return False
  
      return (
          setting == 'always' or
          (setting == 'auto' and sys.stdout.isatty() and terminal_supports_color)
      )
  
new_contents: from __future__ import unicode_literals
  
  import os
  import sys
  
  terminal_supports_color = True
  if os.name == 'nt':  # pragma: no cover (windows)
      from pre_commit.color_windows import enable_virtual_terminal_processing
      try:
          enable_virtual_terminal_processing()
      except WindowsError:
          terminal_supports_color = False
  
  RED = '\033[41m'
  GREEN = '\033[42m'
  YELLOW = '\033[43;30m'
  TURQUOISE = '\033[46;30m'
  NORMAL = '\033[0m'
  
  
  class InvalidColorSetting(ValueError):
      pass
  
  
  def format_color(text, color, use_color_setting):
      """Format text with color.
  
      Args:
          text - Text to be formatted with color if `use_color`
          color - The color start string
          use_color_setting - Whether or not to color
      """
      if not use_color_setting:
          return text
      else:
          return '{}{}{}'.format(color, text, NORMAL)
  
  
  COLOR_CHOICES = ('auto', 'always', 'never')
  
  
  def use_color(setting):
      """Choose whether to use color based on the command argument.
  
      Args:
          setting - Either `auto`, `always`, or `never`
      """
      if setting not in COLOR_CHOICES:
          raise InvalidColorSetting(setting)
  
      if os.environ.get('NO_COLOR'):
          return False
  
      return (
          setting == 'always' or
          (setting == 'auto' and sys.stdout.isatty() and terminal_supports_color)
      )
  
subject: Simplify NO_COLOR check