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import argparse

import os

import sys

if sys.platform == 'win32': # pragma: no cover (windows)

def _enable() -> None:

from ctypes import POINTER

from ctypes import windll

from ctypes import WinError

from ctypes import WINFUNCTYPE

from ctypes.wintypes import BOOL

from ctypes.wintypes import DWORD

from ctypes.wintypes import HANDLE

STD_ERROR_HANDLE = -12

ENABLE_VIRTUAL_TERMINAL_PROCESSING = 4

def bool_errcheck(result, func, args):

if not result:

raise WinError()

return args

GetStdHandle = WINFUNCTYPE(HANDLE, DWORD)(

('GetStdHandle', windll.kernel32), ((1, 'nStdHandle'),),

)

GetConsoleMode = WINFUNCTYPE(BOOL, HANDLE, POINTER(DWORD))(

('GetConsoleMode', windll.kernel32),

((1, 'hConsoleHandle'), (2, 'lpMode')),

)

GetConsoleMode.errcheck = bool_errcheck

SetConsoleMode = WINFUNCTYPE(BOOL, HANDLE, DWORD)(

('SetConsoleMode', windll.kernel32),

((1, 'hConsoleHandle'), (1, 'dwMode')),

)

SetConsoleMode.errcheck = bool_errcheck

# As of Windows 10, the Windows console supports (some) ANSI escape

# sequences, but it needs to be enabled using `SetConsoleMode` first.

# More info on the escape sequences supported:

# https://msdn.microsoft.com/en-us/library/windows/desktop/mt638032(v=vs.85).aspx

stderr = GetStdHandle(STD_ERROR_HANDLE)

flags = GetConsoleMode(stderr)

SetConsoleMode(stderr, flags | ENABLE_VIRTUAL_TERMINAL_PROCESSING)

try:

_enable()

except OSError:

terminal_supports_color = False

else:

terminal_supports_color = True

else: # pragma: win32 no cover

terminal_supports_color = True

RED = '\033[41m'

GREEN = '\033[42m'

YELLOW = '\033[43;30m'

TURQUOISE = '\033[46;30m'

SUBTLE = '\033[2m'

NORMAL = '\033[m'

def format_color(text: str, color: str, use_color_setting: bool) -> str:

"""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 use_color_setting:

return f'{color}{text}{NORMAL}'

else:

return text

COLOR_CHOICES = ('auto', 'always', 'never')

def use_color(setting: str) -> bool:

"""Choose whether to use color based on the command argument.

Args:

setting - Either `auto`, `always`, or `never`

"""

if setting not in COLOR_CHOICES:

raise ValueError(setting)

return (

setting == 'always' or (

setting == 'auto' and

sys.stderr.isatty() and

terminal_supports_color and

os.getenv('TERM') != 'dumb'

)

def add_color_option(parser: argparse.ArgumentParser) -> None:

parser.add_argument(

'--color', default=os.environ.get('PRE_COMMIT_COLOR', 'auto'),

type=use_color,

metavar='{' + ','.join(COLOR_CHOICES) + '}',

help='Whether to use color in output. Defaults to `%(default)s`.',

)

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