qmk/lib/python/milc.py

#!/usr/bin/env python3
# coding=utf-8
"""MILC - A CLI Framework

PYTHON_ARGCOMPLETE_OK

MILC is an opinionated framework for writing CLI apps. It optimizes for the
most common unix tool pattern- small tools that are run from the command
line but generally do not feature any user interaction while they run.

For more details see the MILC documentation:

    <https://github.com/clueboard/milc/tree/master/docs>
"""
from __future__ import division, print_function, unicode_literals
import argparse
import logging
import os
import re
import shlex
import subprocess
import sys
from decimal import Decimal
from pathlib import Path
from platform import platform
from tempfile import NamedTemporaryFile
from time import sleep

try:
    from ConfigParser import RawConfigParser
except ImportError:
    from configparser import RawConfigParser

try:
    import thread
    import threading
except ImportError:
    thread = None

import argcomplete
import colorama
from appdirs import user_config_dir

# Disable logging until we can configure it how the user wants
logging.basicConfig(stream=os.devnull)

# Log Level Representations
EMOJI_LOGLEVELS = {
    'CRITICAL': '{bg_red}{fg_white}¬_¬{style_reset_all}',
    'ERROR': '{fg_red}☒{style_reset_all}',
    'WARNING': '{fg_yellow}⚠{style_reset_all}',
    'INFO': '{fg_blue}ℹ{style_reset_all}',
    'DEBUG': '{fg_cyan}☐{style_reset_all}',
    'NOTSET': '{style_reset_all}¯\\_(o_o)_/¯'
}
EMOJI_LOGLEVELS['FATAL'] = EMOJI_LOGLEVELS['CRITICAL']
EMOJI_LOGLEVELS['WARN'] = EMOJI_LOGLEVELS['WARNING']
UNICODE_SUPPORT = sys.stdout.encoding.lower().startswith('utf')

# ANSI Color setup
# Regex was gratefully borrowed from kfir on stackoverflow:
# https://stackoverflow.com/a/45448194
ansi_regex = r'\x1b(' \
             r'(\[\??\d+[hl])|' \
             r'([=<>a-kzNM78])|' \
             r'([\(\)][a-b0-2])|' \
             r'(\[\d{0,2}[ma-dgkjqi])|' \
             r'(\[\d+;\d+[hfy]?)|' \
             r'(\[;?[hf])|' \
             r'(#[3-68])|' \
             r'([01356]n)|' \
             r'(O[mlnp-z]?)|' \
             r'(/Z)|' \
             r'(\d+)|' \
             r'(\[\?\d;\d0c)|' \
             r'(\d;\dR))'
ansi_escape = re.compile(ansi_regex, flags=re.IGNORECASE)
ansi_styles = (
    ('fg', colorama.ansi.AnsiFore()),
    ('bg', colorama.ansi.AnsiBack()),
    ('style', colorama.ansi.AnsiStyle()),
)
ansi_colors = {}

for prefix, obj in ansi_styles:
    for color in [x for x in obj.__dict__ if not x.startswith('_')]:
        ansi_colors[prefix + '_' + color.lower()] = getattr(obj, color)


def format_ansi(text):
    """Return a copy of text with certain strings replaced with ansi.
    """
    # Avoid .format() so we don't have to worry about the log content
    for color in ansi_colors:
        text = text.replace('{%s}' % color, ansi_colors[color])
    return text + ansi_colors['style_reset_all']


class ANSIFormatterMixin(object):
    """A log formatter mixin that inserts ANSI color.
    """
    def format(self, record):
        msg = super(ANSIFormatterMixin, self).format(record)
        return format_ansi(msg)


class ANSIStrippingMixin(object):
    """A log formatter mixin that strips ANSI.
    """
    def format(self, record):
        msg = super(ANSIStrippingMixin, self).format(record)
        record.levelname = ansi_escape.sub('', record.levelname)
        return ansi_escape.sub('', msg)


class EmojiLoglevelMixin(object):
    """A log formatter mixin that makes the loglevel an emoji on UTF capable terminals.
    """
    def format(self, record):
        if UNICODE_SUPPORT:
            record.levelname = EMOJI_LOGLEVELS[record.levelname].format(**ansi_colors)
        return super(EmojiLoglevelMixin, self).format(record)


class ANSIFormatter(ANSIFormatterMixin, logging.Formatter):
    """A log formatter that colorizes output.
    """
    pass


class ANSIStrippingFormatter(ANSIStrippingMixin, ANSIFormatterMixin, logging.Formatter):
    """A log formatter that strips ANSI
    """
    pass


class ANSIEmojiLoglevelFormatter(EmojiLoglevelMixin, ANSIFormatterMixin, logging.Formatter):
    """A log formatter that adds Emoji and ANSI
    """
    pass


class ANSIStrippingEmojiLoglevelFormatter(ANSIStrippingMixin, EmojiLoglevelMixin, ANSIFormatterMixin, logging.Formatter):
    """A log formatter that adds Emoji and strips ANSI
    """
    pass


class Configuration(object):
    """Represents the running configuration.

    This class never raises IndexError, instead it will return None if a
    section or option does not yet exist.
    """
    def __contains__(self, key):
        return self._config.__contains__(key)

    def __iter__(self):
        return self._config.__iter__()

    def __len__(self):
        return self._config.__len__()

    def __repr__(self):
        return self._config.__repr__()

    def keys(self):
        return self._config.keys()

    def items(self):
        return self._config.items()

    def values(self):
        return self._config.values()

    def __init__(self, *args, **kwargs):
        self._config = {}

    def __getattr__(self, key):
        return self.__getitem__(key)

    def __getitem__(self, key):
        """Returns a config section, creating it if it doesn't exist yet.
        """
        if key not in self._config:
            self.__dict__[key] = self._config[key] = ConfigurationSection(self)

        return self._config[key]

    def __setitem__(self, key, value):
        self.__dict__[key] = value
        self._config[key] = value

    def __delitem__(self, key):
        if key in self.__dict__ and key[0] != '_':
            del self.__dict__[key]
        if key in self._config:
            del self._config[key]


class ConfigurationSection(Configuration):
    def __init__(self, parent, *args, **kwargs):
        super(ConfigurationSection, self).__init__(*args, **kwargs)
        self.parent = parent

    def __getitem__(self, key):
        """Returns a config value, pulling from the `user` section as a fallback.
        This is called when the attribute is accessed either via the get method or through [ ] index.
        """
        if key in self._config and self._config.get(key) is not None:
            return self._config[key]

        elif key in self.parent.user:
            return self.parent.user[key]

        return None

    def __getattr__(self, key):
        """Returns the config value from the `user` section.
        This is called when the attribute is accessed via dot notation but does not exists.
        """
        if key in self.parent.user:
            return self.parent.user[key]

        return None


def handle_store_boolean(self, *args, **kwargs):
    """Does the add_argument for action='store_boolean'.
    """
    disabled_args = None
    disabled_kwargs = kwargs.copy()
    disabled_kwargs['action'] = 'store_false'
    disabled_kwargs['dest'] = self.get_argument_name(*args, **kwargs)
    disabled_kwargs['help'] = 'Disable ' + kwargs['help']
    kwargs['action'] = 'store_true'
    kwargs['help'] = 'Enable ' + kwargs['help']

    for flag in args:
        if flag[:2] == '--':
            disabled_args = ('--no-' + flag[2:],)
            break

    self.add_argument(*args, **kwargs)
    self.add_argument(*disabled_args, **disabled_kwargs)

    return (args, kwargs, disabled_args, disabled_kwargs)


class SubparserWrapper(object):
    """Wrap subparsers so we can track what options the user passed.
    """
    def __init__(self, cli, submodule, subparser):
        self.cli = cli
        self.submodule = submodule
        self.subparser = subparser

        for attr in dir(subparser):
            if not hasattr(self, attr):
                setattr(self, attr, getattr(subparser, attr))

    def completer(self, completer):
        """Add an arpcomplete completer to this subcommand.
        """
        self.subparser.completer = completer

    def add_argument(self, *args, **kwargs):
        """Add an argument for this subcommand.

        This also stores the default for the argument in `self.cli.default_arguments`.
        """
        if kwargs.get('action') == 'store_boolean':
            # Store boolean will call us again with the enable/disable flag arguments
            return handle_store_boolean(self, *args, **kwargs)

        self.cli.acquire_lock()
        argument_name = self.cli.get_argument_name(*args, **kwargs)

        self.subparser.add_argument(*args, **kwargs)

        if kwargs.get('action') == 'store_false':
            self.cli._config_store_false.append(argument_name)

        if kwargs.get('action') == 'store_true':
            self.cli._config_store_true.append(argument_name)

        if self.submodule not in self.cli.default_arguments:
            self.cli.default_arguments[self.submodule] = {}
        self.cli.default_arguments[self.submodule][argument_name] = kwargs.get('default')
        self.cli.release_lock()


class MILC(object):
    """MILC - An Opinionated Batteries Included Framework
    """
    def __init__(self):
        """Initialize the MILC object.

            version
                The version string to associate with your CLI program
        """
        # Setup a lock for thread safety
        self._lock = threading.RLock() if thread else None

        # Define some basic info
        self.acquire_lock()
        self._config_store_true = []
        self._config_store_false = []
        self._description = None
        self._entrypoint = None
        self._inside_context_manager = False
        self.ansi = ansi_colors
        self.arg_only = {}
        self.config = self.config_source = None
        self.config_file = None
        self.default_arguments = {}
        self.version = 'unknown'
        self.platform = platform()

        # Figure out our program name
        self.prog_name = sys.argv[0][:-3] if sys.argv[0].endswith('.py') else sys.argv[0]
        self.prog_name = self.prog_name.split('/')[-1]
        self.release_lock()

        # Initialize all the things
        self.read_config_file()
        self.initialize_argparse()
        self.initialize_logging()

    @property
    def description(self):
        return self._description

    @description.setter
    def description(self, value):
        self._description = self._arg_parser.description = value

    def echo(self, text, *args, **kwargs):
        """Print colorized text to stdout.

        ANSI color strings (such as {fg-blue}) will be converted into ANSI
        escape sequences, and the ANSI reset sequence will be added to all
        strings.

        If *args or **kwargs are passed they will be used to %-format the strings.

        If `self.config.general.color` is False any ANSI escape sequences in the text will be stripped.
        """
        if args and kwargs:
            raise RuntimeError('You can only specify *args or **kwargs, not both!')

        args = args or kwargs
        text = format_ansi(text)

        if not self.config.general.color:
            text = ansi_escape.sub('', text)

        print(text % args)

    def run(self, command, *args, **kwargs):
        """Run a command with subprocess.run
        The *args and **kwargs arguments get passed directly to `subprocess.run`.
        """
        if isinstance(command, str):
            raise TypeError('`command` must be a non-text sequence such as list or tuple.')

        if 'windows' in self.platform.lower():
            safecmd = map(shlex.quote, command)
            safecmd = ' '.join(safecmd)
            command = [os.environ['SHELL'], '-c', safecmd]

        self.log.debug('Running command: %s', command)

        return subprocess.run(command, *args, **kwargs)

    def initialize_argparse(self):
        """Prepare to process arguments from sys.argv.
        """
        kwargs = {
            'fromfile_prefix_chars': '@',
            'conflict_handler': 'resolve',
        }

        self.acquire_lock()
        self.subcommands = {}
        self._subparsers = None
        self.argwarn = argcomplete.warn
        self.args = None
        self._arg_parser = argparse.ArgumentParser(**kwargs)
        self.set_defaults = self._arg_parser.set_defaults
        self.print_usage = self._arg_parser.print_usage
        self.print_help = self._arg_parser.print_help
        self.release_lock()

    def completer(self, completer):
        """Add an argcomplete completer to this subcommand.
        """
        self._arg_parser.completer = completer

    def add_argument(self, *args, **kwargs):
        """Wrapper to add arguments and track whether they were passed on the command line.
        """
        if 'action' in kwargs and kwargs['action'] == 'store_boolean':
            return handle_store_boolean(self, *args, **kwargs)

        self.acquire_lock()

        self._arg_parser.add_argument(*args, **kwargs)
        if 'general' not in self.default_arguments:
            self.default_arguments['general'] = {}
        self.default_arguments['general'][self.get_argument_name(*args, **kwargs)] = kwargs.get('default')

        self.release_lock()

    def initialize_logging(self):
        """Prepare the defaults for the logging infrastructure.
        """
        self.acquire_lock()
        self.log_file = None
        self.log_file_mode = 'a'
        self.log_file_handler = None
        self.log_print = True
        self.log_print_to = sys.stderr
        self.log_print_level = logging.INFO
        self.log_file_level = logging.DEBUG
        self.log_level = logging.INFO
        self.log = logging.getLogger(self.__class__.__name__)
        self.log.setLevel(logging.DEBUG)
        logging.root.setLevel(logging.DEBUG)
        self.release_lock()

        self.add_argument('-V', '--version', version=self.version, action='version', help='Display the version and exit')
        self.add_argument('-v', '--verbose', action='store_true', help='Make the logging more verbose')
        self.add_argument('--datetime-fmt', default='%Y-%m-%d %H:%M:%S', help='Format string for datetimes')
        self.add_argument('--log-fmt', default='%(levelname)s %(message)s', help='Format string for printed log output')
        self.add_argument('--log-file-fmt', default='[%(levelname)s] [%(asctime)s] [file:%(pathname)s] [line:%(lineno)d] %(message)s', help='Format string for log file.')
        self.add_argument('--log-file', help='File to write log messages to')
        self.add_argument('--color', action='store_boolean', default=True, help='color in output')
        self.add_argument('--config-file', help='The location for the configuration file')
        self.arg_only['config_file'] = ['general']

    def add_subparsers(self, title='Sub-commands', **kwargs):
        if self._inside_context_manager:
            raise RuntimeError('You must run this before the with statement!')

        self.acquire_lock()
        self._subparsers = self._arg_parser.add_subparsers(title=title, dest='subparsers', **kwargs)
        self.release_lock()

    def acquire_lock(self):
        """Acquire the MILC lock for exclusive access to properties.
        """
        if self._lock:
            self._lock.acquire()

    def release_lock(self):
        """Release the MILC lock.
        """
        if self._lock:
            self._lock.release()

    def find_config_file(self):
        """Locate the config file.
        """
        if self.config_file:
            return self.config_file

        if '--config-file' in sys.argv:
            return Path(sys.argv[sys.argv.index('--config-file') + 1]).expanduser().resolve()

        filedir = user_config_dir(appname='qmk', appauthor='QMK')
        filename = '%s.ini' % self.prog_name
        return Path(filedir) / filename

    def get_argument_name(self, *args, **kwargs):
        """Takes argparse arguments and returns the dest name.
        """
        try:
            return self._arg_parser._get_optional_kwargs(*args, **kwargs)['dest']
        except ValueError:
            return self._arg_parser._get_positional_kwargs(*args, **kwargs)['dest']

    def argument(self, *args, **kwargs):
        """Decorator to call self.add_argument or self.<subcommand>.add_argument.
        """
        if self._inside_context_manager:
            raise RuntimeError('You must run this before the with statement!')

        def argument_function(handler):
            subcommand_name = handler.__name__.replace("_", "-")

            if kwargs.get('arg_only'):
                arg_name = self.get_argument_name(*args, **kwargs)
                if arg_name not in self.arg_only:
                    self.arg_only[arg_name] = []
                self.arg_only[arg_name].append(subcommand_name)
                del kwargs['arg_only']

            if handler is self._entrypoint:
                self.add_argument(*args, **kwargs)

            elif subcommand_name in self.subcommands:
                self.subcommands[subcommand_name].add_argument(*args, **kwargs)

            else:
                raise RuntimeError('Decorated function is not entrypoint or subcommand!')

            return handler

        return argument_function

    def arg_passed(self, arg):
        """Returns True if arg was passed on the command line.
        """
        return self.default_arguments.get(arg) != self.args[arg]

    def parse_args(self):
        """Parse the CLI args.
        """
        if self.args:
            self.log.debug('Warning: Arguments have already been parsed, ignoring duplicate attempt!')
            return

        argcomplete.autocomplete(self._arg_parser)

        self.acquire_lock()
        self.args = self._arg_parser.parse_args()

        if 'entrypoint' in self.args:
            self._entrypoint = self.args.entrypoint

        self.release_lock()

    def read_config_file(self):
        """Read in the configuration file and store it in self.config.
        """
        self.acquire_lock()
        self.config = Configuration()
        self.config_source = Configuration()
        self.config_file = self.find_config_file()

        if self.config_file and self.config_file.exists():
            config = RawConfigParser(self.config)
            config.read(str(self.config_file))

            # Iterate over the config file options and write them into self.config
            for section in config.sections():
                for option in config.options(section):
                    value = config.get(section, option)

                    # Coerce values into useful datatypes
                    if value.lower() in ['1', 'yes', 'true', 'on']:
                        value = True
                    elif value.lower() in ['0', 'no', 'false', 'off']:
                        value = False
                    elif value.lower() in ['none']:
                        continue
                    elif value.replace('.', '').isdigit():
                        if '.' in value:
                            value = Decimal(value)
                        else:
                            value = int(value)

                    self.config[section][option] = value
                    self.config_source[section][option] = 'config_file'

        self.release_lock()

    def merge_args_into_config(self):
        """Merge CLI arguments into self.config to create the runtime configuration.
        """
        self.acquire_lock()
        for argument in vars(self.args):
            if argument in ('subparsers', 'entrypoint'):
                continue

            # Find the argument's section
            # Underscores in command's names are converted to dashes during initialization.
            # TODO(Erovia) Find a better solution
            entrypoint_name = self._entrypoint.__name__.replace("_", "-")
            if entrypoint_name in self.default_arguments and argument in self.default_arguments[entrypoint_name]:
                argument_found = True
                section = self._entrypoint.__name__
            if argument in self.default_arguments['general']:
                argument_found = True
                section = 'general'

            if not argument_found:
                raise RuntimeError('Could not find argument in `self.default_arguments`. This should be impossible!')
                exit(1)

            if argument not in self.arg_only or section not in self.arg_only[argument]:
                # Determine the arg value and source
                arg_value = getattr(self.args, argument)
                if argument in self._config_store_true and arg_value:
                    passed_on_cmdline = True
                elif argument in self._config_store_false and not arg_value:
                    passed_on_cmdline = True
                elif arg_value is not None:
                    passed_on_cmdline = True
                else:
                    passed_on_cmdline = False

                # Merge this argument into self.config
                if passed_on_cmdline and (argument in self.default_arguments['general'] or argument in self.default_arguments[entrypoint_name] or argument not in self.config[entrypoint_name]):
                    self.config[section][argument] = arg_value
                    self.config_source[section][argument] = 'argument'

        self.release_lock()

    def save_config(self):
        """Save the current configuration to the config file.
        """
        self.log.debug("Saving config file to '%s'", str(self.config_file))

        if not self.config_file:
            self.log.warning('%s.config_file file not set, not saving config!', self.__class__.__name__)
            return

        self.acquire_lock()

        # Generate a sanitized version of our running configuration
        config = RawConfigParser()
        for section_name, section in self.config._config.items():
            config.add_section(section_name)
            for option_name, value in section.items():
                if section_name == 'general':
                    if option_name in ['config_file']:
                        continue
                if value is not None:
                    config.set(section_name, option_name, str(value))

        # Write out the config file
        config_dir = self.config_file.parent
        if not config_dir.exists():
            config_dir.mkdir(parents=True, exist_ok=True)

        with NamedTemporaryFile(mode='w', dir=str(config_dir), delete=False) as tmpfile:
            config.write(tmpfile)

        # Move the new config file into place atomically
        if os.path.getsize(tmpfile.name) > 0:
            os.replace(tmpfile.name, str(self.config_file))
        else:
            self.log.warning('Config file saving failed, not replacing %s with %s.', str(self.config_file), tmpfile.name)

        # Housekeeping
        self.release_lock()
        cli.log.info('Wrote configuration to %s', shlex.quote(str(self.config_file)))

    def __call__(self):
        """Execute the entrypoint function.
        """
        if not self._inside_context_manager:
            # If they didn't use the context manager use it ourselves
            with self:
                return self.__call__()

        if not self._entrypoint:
            raise RuntimeError('No entrypoint provided!')

        return self._entrypoint(self)

    def entrypoint(self, description):
        """Set the entrypoint for when no subcommand is provided.
        """
        if self._inside_context_manager:
            raise RuntimeError('You must run this before cli()!')

        self.acquire_lock()
        self.description = description
        self.release_lock()

        def entrypoint_func(handler):
            self.acquire_lock()
            self._entrypoint = handler
            self.release_lock()

            return handler

        return entrypoint_func

    def add_subcommand(self, handler, description, name=None, hidden=False, **kwargs):
        """Register a subcommand.

        If name is not provided we use `handler.__name__`.
        """

        if self._inside_context_manager:
            raise RuntimeError('You must run this before the with statement!')

        if self._subparsers is None:
            self.add_subparsers(metavar="")

        if not name:
            name = handler.__name__.replace("_", "-")

        self.acquire_lock()
        if not hidden:
            self._subparsers.metavar = "{%s,%s}" % (self._subparsers.metavar[1:-1], name) if self._subparsers.metavar else "{%s%s}" % (self._subparsers.metavar[1:-1], name)
            kwargs['help'] = description
        self.subcommands[name] = SubparserWrapper(self, name, self._subparsers.add_parser(name, **kwargs))
        self.subcommands[name].set_defaults(entrypoint=handler)

        self.release_lock()

        return handler

    def subcommand(self, description, hidden=False, **kwargs):
        """Decorator to register a subcommand.
        """
        def subcommand_function(handler):
            return self.add_subcommand(handler, description, hidden=hidden, **kwargs)

        return subcommand_function

    def setup_logging(self):
        """Called by __enter__() to setup the logging configuration.
        """
        if len(logging.root.handlers) != 0:
            # MILC is the only thing that should have root log handlers
            logging.root.handlers = []

        self.acquire_lock()

        if self.config['general']['verbose']:
            self.log_print_level = logging.DEBUG

        self.log_file = self.config['general']['log_file'] or self.log_file
        self.log_file_format = ANSIStrippingFormatter(self.config['general']['log_file_fmt'], self.config['general']['datetime_fmt'])
        self.log_format = self.config['general']['log_fmt']

        if self.config.general.color:
            self.log_format = ANSIEmojiLoglevelFormatter(self.config.general.log_fmt, self.config.general.datetime_fmt)
        else:
            self.log_format = ANSIStrippingEmojiLoglevelFormatter(self.config.general.log_fmt, self.config.general.datetime_fmt)

        if self.log_file:
            self.log_file_handler = logging.FileHandler(self.log_file, self.log_file_mode)
            self.log_file_handler.setLevel(self.log_file_level)
            self.log_file_handler.setFormatter(self.log_file_format)
            logging.root.addHandler(self.log_file_handler)

        if self.log_print:
            self.log_print_handler = logging.StreamHandler(self.log_print_to)
            self.log_print_handler.setLevel(self.log_print_level)
            self.log_print_handler.setFormatter(self.log_format)
            logging.root.addHandler(self.log_print_handler)

        self.release_lock()

    def __enter__(self):
        if self._inside_context_manager:
            self.log.debug('Warning: context manager was entered again. This usually means that self.__call__() was called before the with statement. You probably do not want to do that.')
            return

        self.acquire_lock()
        self._inside_context_manager = True
        self.release_lock()

        colorama.init()
        self.parse_args()
        self.merge_args_into_config()
        self.setup_logging()

        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.acquire_lock()
        self._inside_context_manager = False
        self.release_lock()

        if exc_type is not None and not isinstance(SystemExit(), exc_type):
            print(exc_type)
            logging.exception(exc_val)
            exit(255)


cli = MILC()

if __name__ == '__main__':

    @cli.argument('-c', '--comma', help='comma in output', default=True, action='store_boolean')
    @cli.entrypoint('My useful CLI tool with subcommands.')
    def main(cli):
        comma = ',' if cli.config.general.comma else ''
        cli.log.info('{bg_green}{fg_red}Hello%s World!', comma)

    @cli.argument('-n', '--name', help='Name to greet', default='World')
    @cli.subcommand('Description of hello subcommand here.')
    def hello(cli):
        comma = ',' if cli.config.general.comma else ''
        cli.log.info('{fg_blue}Hello%s %s!', comma, cli.config.hello.name)

    def goodbye(cli):
        comma = ',' if cli.config.general.comma else ''
        cli.log.info('{bg_red}Goodbye%s %s!', comma, cli.config.goodbye.name)

    @cli.argument('-n', '--name', help='Name to greet', default='World')
    @cli.subcommand('Think a bit before greeting the user.')
    def thinking(cli):
        comma = ',' if cli.config.general.comma else ''
        spinner = cli.spinner(text='Just a moment...', spinner='earth')
        spinner.start()
        sleep(2)
        spinner.stop()

        with cli.spinner(text='Almost there!', spinner='moon'):
            sleep(2)

        cli.log.info('{fg_cyan}Hello%s %s!', comma, cli.config.thinking.name)

    @cli.subcommand('Show off our ANSI colors.')
    def pride(cli):
        cli.echo('{bg_red}                    ')
        cli.echo('{bg_lightred_ex}                    ')
        cli.echo('{bg_lightyellow_ex}                    ')
        cli.echo('{bg_green}                    ')
        cli.echo('{bg_blue}                    ')
        cli.echo('{bg_magenta}                    ')

    # You can register subcommands using decorators as seen above, or using functions like like this:
    cli.add_subcommand(goodbye, 'This will show up in --help output.')
    cli.goodbye.add_argument('-n', '--name', help='Name to bid farewell to', default='World')

    cli()  # Automatically picks between main(), hello() and goodbye()