How to use the thefuck.utils.which function in thefuck

proc = subprocess.Popen('docker', stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    # Old version docker returns its output to stdout, while newer version returns to stderr.
    lines = proc.stdout.readlines() or proc.stderr.readlines()
    lines = [line.decode('utf-8') for line in lines]

    # Only newer versions of docker have management commands in the help text.
    if 'Management Commands:\n' in lines:
        management_commands = _parse_commands(lines, 'Management Commands:')
    else:
        management_commands = []
    regular_commands = _parse_commands(lines, 'Commands:')
    return management_commands + regular_commands


if which('docker'):
    get_docker_commands = cache(which('docker'))(get_docker_commands)


@sudo_support
def get_new_command(command):
    if 'Usage:' in command.output and len(command.script_parts) > 1:
        management_subcommands = _parse_commands(command.output.split('\n'), 'Commands:')
        return replace_command(command, command.script_parts[2], management_subcommands)

    wrong_command = re.findall(
        r"docker: '(\w+)' is not a docker command.", command.output)[0]
    return replace_command(command, wrong_command, get_docker_commands())

import subprocess
from ..utils import memoize, which


brew_available = bool(which('brew'))


@memoize
def get_brew_path_prefix():
    """To get brew path"""
    try:
        return subprocess.check_output(['brew', '--prefix'],
                                       universal_newlines=True).strip()
    except Exception:
        return None

def _get_alias(known_args):
    if six.PY2:
        warn("The Fuck will drop Python 2 support soon, more details "
             "https://github.com/nvbn/thefuck/issues/685")

    alias = shell.app_alias(known_args.alias)

    if known_args.enable_experimental_instant_mode:
        if six.PY2:
            warn("Instant mode requires Python 3")
        elif not which('script'):
            warn("Instant mode requires `script` app")
        else:
            return shell.instant_mode_alias(known_args.alias)

    return alias

def match(command):
    return (not which(command.script_parts[0])
            and ('not found' in command.output
                 or 'is not recognized as' in command.output)
            and bool(get_close_matches(command.script_parts[0],
                                       get_all_executables())))

def archlinux_env():
    if thefuck.utils.which('yaourt'):
        pacman = 'yaourt'
    elif thefuck.utils.which('pacman'):
        pacman = 'sudo pacman'
    else:
        return False, None

    enabled_by_default = thefuck.utils.which('pkgfile')

    return enabled_by_default, pacman

def archlinux_env():
    if utils.which('yay'):
        pacman = 'yay'
    elif utils.which('yaourt'):
        pacman = 'yaourt'
    elif utils.which('pacman'):
        pacman = 'sudo pacman'
    else:
        return False, None

    enabled_by_default = utils.which('pkgfile')

    return enabled_by_default, pacman

def archlinux_env():
    if thefuck.utils.which('yaourt'):
        pacman = 'yaourt'
    elif thefuck.utils.which('pacman'):
        pacman = 'sudo pacman'
    else:
        return False, None

    enabled_by_default = thefuck.utils.which('pkgfile')

    return enabled_by_default, pacman

def archlinux_env():
    if utils.which('yay'):
        pacman = 'yay'
    elif utils.which('yaourt'):
        pacman = 'yaourt'
    elif utils.which('pacman'):
        pacman = 'sudo pacman'
    else:
        return False, None

    enabled_by_default = utils.which('pkgfile')

    return enabled_by_default, pacman

def match(command):
    return (not which(command.script_parts[0])
            and 'not found' in command.output
            and os.path.isfile('gradlew'))