You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

716 lines
24 KiB

#!/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 sys
from decimal import Decimal
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
# 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}{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']
# 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 ANSIFormatter(logging.Formatter):
"""A log formatter that inserts ANSI color.
"""
def format(self, record):
msg = super(ANSIFormatter, self).format(record)
return format_ansi(msg)
class ANSIEmojiLoglevelFormatter(ANSIFormatter):
"""A log formatter that makes the loglevel an emoji.
"""
def format(self, record):
record.levelname = EMOJI_LOGLEVELS[record.levelname].format(**ansi_colors)
return super(ANSIEmojiLoglevelFormatter, self).format(record)
class ANSIStrippingFormatter(ANSIFormatter):
"""A log formatter that strips ANSI.
"""
def format(self, record):
msg = super(ANSIStrippingFormatter, self).format(record)
return ansi_escape.sub('', msg)
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 = {}
self.default_container = ConfigurationOption
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] = ConfigurationOption()
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]
del self._config[key]
class ConfigurationOption(Configuration):
def __init__(self, *args, **kwargs):
super(ConfigurationOption, self).__init__(*args, **kwargs)
self.default_container = dict
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] = None
return self._config[key]
def handle_store_boolean(self, *args, **kwargs):
"""Does the add_argument for action='store_boolean'.
"""
kwargs['add_dest'] = False
disabled_args = None
disabled_kwargs = kwargs.copy()
disabled_kwargs['action'] = 'store_false'
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 populate the normal and the shadow parser.
"""
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):
if kwargs.get('add_dest', True):
kwargs['dest'] = self.submodule + '_' + self.cli.get_argument_name(*args, **kwargs)
if 'add_dest' in kwargs:
del kwargs['add_dest']
if 'action' in kwargs and kwargs['action'] == 'store_boolean':
return handle_store_boolean(self, *args, **kwargs)
self.cli.acquire_lock()
self.subparser.add_argument(*args, **kwargs)
if 'default' in kwargs:
del kwargs['default']
if 'action' in kwargs and kwargs['action'] == 'store_false':
kwargs['action'] == 'store_true'
self.cli.subcommands_default[self.submodule].add_argument(*args, **kwargs)
self.cli.release_lock()
class MILC(object):
"""MILC - An Opinionated Batteries Included Framework
"""
def __init__(self):
"""Initialize the MILC object.
"""
# Setup a lock for thread safety
self._lock = threading.RLock() if thread else None
# Define some basic info
self.acquire_lock()
self._description = None
self._entrypoint = None
self._inside_context_manager = False
self.ansi = ansi_colors
self.config = Configuration()
self.config_file = None
self.prog_name = sys.argv[0][:-3] if sys.argv[0].endswith('.py') else sys.argv[0]
self.version = os.environ.get('QMK_VERSION', 'unknown')
self.release_lock()
# Initialize all the things
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 = self._arg_defaults.description = value
def echo(self, text, *args, **kwargs):
"""Print colorized text to stdout, as long as stdout is a tty.
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 args and kwargs:
raise RuntimeError('You can only specify *args or **kwargs, not both!')
if sys.stdout.isatty():
args = args or kwargs
text = format_ansi(text)
print(text % args)
def initialize_argparse(self):
"""Prepare to process arguments from sys.argv.
"""
kwargs = {
'fromfile_prefix_chars': '@',
'conflict_handler': 'resolve',
}
self.acquire_lock()
self.subcommands = {}
self.subcommands_default = {}
self._subparsers = None
self._subparsers_default = None
self.argwarn = argcomplete.warn
self.args = None
self._arg_defaults = argparse.ArgumentParser(**kwargs)
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 arpcomplete completer to this subcommand.
"""
self._arg_parser.completer = completer
def add_argument(self, *args, **kwargs):
"""Wrapper to add arguments to both the main and the shadow argparser.
"""
if kwargs.get('add_dest', True) and args[0][0] == '-':
kwargs['dest'] = 'general_' + self.get_argument_name(*args, **kwargs)
if 'add_dest' in kwargs:
del kwargs['add_dest']
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)
# Populate the shadow parser
if 'default' in kwargs:
del kwargs['default']
if 'action' in kwargs and kwargs['action'] == 'store_false':
kwargs['action'] == 'store_true'
self._arg_defaults.add_argument(*args, **kwargs)
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('-c', '--config-file', help='The config file to read and/or write')
self.add_argument('--save-config', action='store_true', help='Save the running configuration to the config file')
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_default = self._arg_defaults.add_subparsers(title=title, dest='subparsers', **kwargs)
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 self.args and self.args.general_config_file:
return self.args.general_config_file
return os.path.abspath(os.path.expanduser('~/.%s.ini' % self.prog_name))
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):
if handler is self._entrypoint:
self.add_argument(*args, **kwargs)
elif handler.__name__ in self.subcommands:
self.subcommands[handler.__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.args_passed[arg] in (None, False)
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()
self.args_passed = self._arg_defaults.parse_args()
if 'entrypoint' in self.args:
self._entrypoint = self.args.entrypoint
if self.args.general_config_file:
self.config_file = self.args.general_config_file
self.release_lock()
def read_config(self):
"""Parse the configuration file and determine the runtime configuration.
"""
self.acquire_lock()
self.config_file = self.find_config_file()
if self.config_file and os.path.exists(self.config_file):
config = RawConfigParser(self.config)
config.read(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', 'none', 'off']:
value = False
elif value.replace('.', '').isdigit():
if '.' in value:
value = Decimal(value)
else:
value = int(value)
self.config[section][option] = value
# Fold the CLI args into self.config
for argument in vars(self.args):
if argument in ('subparsers', 'entrypoint'):
continue
if '_' not in argument:
continue
section, option = argument.split('_', 1)
if hasattr(self.args_passed, argument):
self.config[section][option] = getattr(self.args, argument)
else:
if option not in self.config[section]:
self.config[section][option] = getattr(self.args, argument)
self.release_lock()
def save_config(self):
"""Save the current configuration to the config file.
"""
self.log.debug("Saving config file to '%s'", 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()
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 ['save_config']:
continue
config.set(section_name, option_name, str(value))
with NamedTemporaryFile(mode='w', dir=os.path.dirname(self.config_file), delete=False) as tmpfile:
config.write(tmpfile)
# Move the new config file into place atomically
if os.path.getsize(tmpfile.name) > 0:
os.rename(tmpfile.name, self.config_file)
else:
self.log.warning('Config file saving failed, not replacing %s with %s.', self.config_file, tmpfile.name)
self.release_lock()
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:
self.__call__()
return
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, **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()
if not name:
name = handler.__name__
self.acquire_lock()
kwargs['help'] = description
self.subcommands_default[name] = self._subparsers_default.add_parser(name, **kwargs)
self.subcommands[name] = SubparserWrapper(self, name, self._subparsers.add_parser(name, **kwargs))
self.subcommands[name].set_defaults(entrypoint=handler)
if name not in self.__dict__:
self.__dict__[name] = self.subcommands[name]
else:
self.log.debug("Could not add subcommand '%s' to attributes, key already exists!", name)
self.release_lock()
return handler
def subcommand(self, description, **kwargs):
"""Decorator to register a subcommand.
"""
def subcommand_function(handler):
return self.add_subcommand(handler, description, **kwargs)
return subcommand_function
def setup_logging(self):
"""Called by __enter__() to setup the logging configuration.
"""
if len(logging.root.handlers) != 0:
# This is not a design decision. This is what I'm doing for now until I can examine and think about this situation in more detail.
raise RuntimeError('MILC should be the only system installing root log 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 = self.config['general']['log_file_fmt']
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.args.general_log_fmt, self.config.general.datetime_fmt)
else:
self.log_format = ANSIStrippingFormatter(self.args.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.read_config()
self.setup_logging()
if self.config.general.save_config:
self.save_config()
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()
print(sorted(ansi_colors.keys()))