758 lines
26 KiB
Python
758 lines
26 KiB
Python
#!/usr/bin/env python3
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# coding=utf-8
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"""MILC - A CLI Framework
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PYTHON_ARGCOMPLETE_OK
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MILC is an opinionated framework for writing CLI apps. It optimizes for the
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most common unix tool pattern- small tools that are run from the command
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line but generally do not feature any user interaction while they run.
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For more details see the MILC documentation:
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<https://github.com/clueboard/milc/tree/master/docs>
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"""
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from __future__ import division, print_function, unicode_literals
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import argparse
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import logging
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import os
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import re
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import shlex
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import sys
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from decimal import Decimal
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from pathlib import Path
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from tempfile import NamedTemporaryFile
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from time import sleep
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try:
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from ConfigParser import RawConfigParser
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except ImportError:
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from configparser import RawConfigParser
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try:
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import thread
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import threading
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except ImportError:
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thread = None
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import argcomplete
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import colorama
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from appdirs import user_config_dir
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# Disable logging until we can configure it how the user wants
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logging.basicConfig(stream=os.devnull)
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# Log Level Representations
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EMOJI_LOGLEVELS = {
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'CRITICAL': '{bg_red}{fg_white}¬_¬{style_reset_all}',
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'ERROR': '{fg_red}☒{style_reset_all}',
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'WARNING': '{fg_yellow}⚠{style_reset_all}',
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'INFO': '{fg_blue}ℹ{style_reset_all}',
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'DEBUG': '{fg_cyan}☐{style_reset_all}',
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'NOTSET': '{style_reset_all}¯\\_(o_o)_/¯'
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}
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EMOJI_LOGLEVELS['FATAL'] = EMOJI_LOGLEVELS['CRITICAL']
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EMOJI_LOGLEVELS['WARN'] = EMOJI_LOGLEVELS['WARNING']
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UNICODE_SUPPORT = sys.stdout.encoding.lower().startswith('utf')
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# ANSI Color setup
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# Regex was gratefully borrowed from kfir on stackoverflow:
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# https://stackoverflow.com/a/45448194
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ansi_regex = r'\x1b(' \
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r'(\[\??\d+[hl])|' \
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r'([=<>a-kzNM78])|' \
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r'([\(\)][a-b0-2])|' \
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r'(\[\d{0,2}[ma-dgkjqi])|' \
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r'(\[\d+;\d+[hfy]?)|' \
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r'(\[;?[hf])|' \
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r'(#[3-68])|' \
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r'([01356]n)|' \
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r'(O[mlnp-z]?)|' \
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r'(/Z)|' \
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r'(\d+)|' \
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r'(\[\?\d;\d0c)|' \
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r'(\d;\dR))'
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ansi_escape = re.compile(ansi_regex, flags=re.IGNORECASE)
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ansi_styles = (
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('fg', colorama.ansi.AnsiFore()),
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('bg', colorama.ansi.AnsiBack()),
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('style', colorama.ansi.AnsiStyle()),
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)
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ansi_colors = {}
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for prefix, obj in ansi_styles:
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for color in [x for x in obj.__dict__ if not x.startswith('_')]:
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ansi_colors[prefix + '_' + color.lower()] = getattr(obj, color)
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def format_ansi(text):
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"""Return a copy of text with certain strings replaced with ansi.
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"""
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# Avoid .format() so we don't have to worry about the log content
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for color in ansi_colors:
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text = text.replace('{%s}' % color, ansi_colors[color])
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return text + ansi_colors['style_reset_all']
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class ANSIFormatter(logging.Formatter):
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"""A log formatter that inserts ANSI color.
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"""
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def format(self, record):
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msg = super(ANSIFormatter, self).format(record)
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return format_ansi(msg)
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class ANSIEmojiLoglevelFormatter(ANSIFormatter):
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"""A log formatter that makes the loglevel an emoji on UTF capable terminals.
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"""
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def format(self, record):
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if UNICODE_SUPPORT:
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record.levelname = EMOJI_LOGLEVELS[record.levelname].format(**ansi_colors)
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return super(ANSIEmojiLoglevelFormatter, self).format(record)
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class ANSIStrippingFormatter(ANSIFormatter):
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"""A log formatter that strips ANSI.
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"""
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def format(self, record):
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msg = super(ANSIStrippingFormatter, self).format(record)
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return ansi_escape.sub('', msg)
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class Configuration(object):
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"""Represents the running configuration.
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This class never raises IndexError, instead it will return None if a
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section or option does not yet exist.
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"""
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def __contains__(self, key):
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return self._config.__contains__(key)
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def __iter__(self):
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return self._config.__iter__()
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def __len__(self):
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return self._config.__len__()
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def __repr__(self):
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return self._config.__repr__()
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def keys(self):
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return self._config.keys()
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def items(self):
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return self._config.items()
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def values(self):
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return self._config.values()
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def __init__(self, *args, **kwargs):
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self._config = {}
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def __getattr__(self, key):
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return self.__getitem__(key)
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def __getitem__(self, key):
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"""Returns a config section, creating it if it doesn't exist yet.
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"""
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if key not in self._config:
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self.__dict__[key] = self._config[key] = ConfigurationSection(self)
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return self._config[key]
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def __setitem__(self, key, value):
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self.__dict__[key] = value
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self._config[key] = value
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def __delitem__(self, key):
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if key in self.__dict__ and key[0] != '_':
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del self.__dict__[key]
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if key in self._config:
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del self._config[key]
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class ConfigurationSection(Configuration):
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def __init__(self, parent, *args, **kwargs):
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super(ConfigurationSection, self).__init__(*args, **kwargs)
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self.parent = parent
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def __getitem__(self, key):
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"""Returns a config value, pulling from the `user` section as a fallback.
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This is called when the attribute is accessed either via the get method or through [ ] index.
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"""
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if key in self._config and self._config.get(key) is not None:
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return self._config[key]
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elif key in self.parent.user:
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return self.parent.user[key]
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return None
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def __getattr__(self, key):
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"""Returns the config value from the `user` section.
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This is called when the attribute is accessed via dot notation but does not exists.
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"""
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if key in self.parent.user:
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return self.parent.user[key]
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return None
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def handle_store_boolean(self, *args, **kwargs):
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"""Does the add_argument for action='store_boolean'.
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"""
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disabled_args = None
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disabled_kwargs = kwargs.copy()
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disabled_kwargs['action'] = 'store_false'
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disabled_kwargs['dest'] = self.get_argument_name(*args, **kwargs)
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disabled_kwargs['help'] = 'Disable ' + kwargs['help']
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kwargs['action'] = 'store_true'
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kwargs['help'] = 'Enable ' + kwargs['help']
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for flag in args:
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if flag[:2] == '--':
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disabled_args = ('--no-' + flag[2:],)
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break
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self.add_argument(*args, **kwargs)
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self.add_argument(*disabled_args, **disabled_kwargs)
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return (args, kwargs, disabled_args, disabled_kwargs)
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class SubparserWrapper(object):
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"""Wrap subparsers so we can track what options the user passed.
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"""
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def __init__(self, cli, submodule, subparser):
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self.cli = cli
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self.submodule = submodule
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self.subparser = subparser
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for attr in dir(subparser):
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if not hasattr(self, attr):
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setattr(self, attr, getattr(subparser, attr))
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def completer(self, completer):
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"""Add an arpcomplete completer to this subcommand.
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"""
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self.subparser.completer = completer
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def add_argument(self, *args, **kwargs):
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"""Add an argument for this subcommand.
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This also stores the default for the argument in `self.cli.default_arguments`.
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"""
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if 'action' in kwargs and kwargs['action'] == 'store_boolean':
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# Store boolean will call us again with the enable/disable flag arguments
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return handle_store_boolean(self, *args, **kwargs)
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self.cli.acquire_lock()
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self.subparser.add_argument(*args, **kwargs)
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if self.submodule not in self.cli.default_arguments:
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self.cli.default_arguments[self.submodule] = {}
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self.cli.default_arguments[self.submodule][self.cli.get_argument_name(*args, **kwargs)] = kwargs.get('default')
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self.cli.release_lock()
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class MILC(object):
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"""MILC - An Opinionated Batteries Included Framework
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"""
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def __init__(self):
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"""Initialize the MILC object.
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version
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The version string to associate with your CLI program
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"""
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# Setup a lock for thread safety
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self._lock = threading.RLock() if thread else None
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# Define some basic info
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self.acquire_lock()
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self._description = None
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self._entrypoint = None
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self._inside_context_manager = False
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self.ansi = ansi_colors
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self.arg_only = []
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self.config = None
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self.config_file = None
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self.default_arguments = {}
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self.version = 'unknown'
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self.release_lock()
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# Figure out our program name
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self.prog_name = sys.argv[0][:-3] if sys.argv[0].endswith('.py') else sys.argv[0]
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self.prog_name = self.prog_name.split('/')[-1]
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# Initialize all the things
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self.read_config_file()
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self.initialize_argparse()
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self.initialize_logging()
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@property
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def description(self):
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return self._description
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@description.setter
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def description(self, value):
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self._description = self._arg_parser.description = value
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def echo(self, text, *args, **kwargs):
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"""Print colorized text to stdout.
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ANSI color strings (such as {fg-blue}) will be converted into ANSI
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escape sequences, and the ANSI reset sequence will be added to all
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strings.
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If *args or **kwargs are passed they will be used to %-format the strings.
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"""
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if args and kwargs:
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raise RuntimeError('You can only specify *args or **kwargs, not both!')
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args = args or kwargs
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text = format_ansi(text)
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print(text % args)
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def initialize_argparse(self):
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"""Prepare to process arguments from sys.argv.
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"""
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kwargs = {
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'fromfile_prefix_chars': '@',
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'conflict_handler': 'resolve',
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}
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self.acquire_lock()
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self.subcommands = {}
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self._subparsers = None
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self.argwarn = argcomplete.warn
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self.args = None
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self._arg_parser = argparse.ArgumentParser(**kwargs)
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self.set_defaults = self._arg_parser.set_defaults
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self.print_usage = self._arg_parser.print_usage
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self.print_help = self._arg_parser.print_help
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self.release_lock()
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def completer(self, completer):
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"""Add an argcomplete completer to this subcommand.
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"""
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self._arg_parser.completer = completer
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def add_argument(self, *args, **kwargs):
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"""Wrapper to add arguments and track whether they were passed on the command line.
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"""
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if 'action' in kwargs and kwargs['action'] == 'store_boolean':
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return handle_store_boolean(self, *args, **kwargs)
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self.acquire_lock()
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self._arg_parser.add_argument(*args, **kwargs)
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if 'general' not in self.default_arguments:
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self.default_arguments['general'] = {}
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self.default_arguments['general'][self.get_argument_name(*args, **kwargs)] = kwargs.get('default')
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self.release_lock()
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def initialize_logging(self):
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"""Prepare the defaults for the logging infrastructure.
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"""
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self.acquire_lock()
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self.log_file = None
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self.log_file_mode = 'a'
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self.log_file_handler = None
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self.log_print = True
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self.log_print_to = sys.stderr
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self.log_print_level = logging.INFO
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self.log_file_level = logging.DEBUG
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self.log_level = logging.INFO
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self.log = logging.getLogger(self.__class__.__name__)
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self.log.setLevel(logging.DEBUG)
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logging.root.setLevel(logging.DEBUG)
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self.release_lock()
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self.add_argument('-V', '--version', version=self.version, action='version', help='Display the version and exit')
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self.add_argument('-v', '--verbose', action='store_true', help='Make the logging more verbose')
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self.add_argument('--datetime-fmt', default='%Y-%m-%d %H:%M:%S', help='Format string for datetimes')
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self.add_argument('--log-fmt', default='%(levelname)s %(message)s', help='Format string for printed log output')
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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.')
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self.add_argument('--log-file', help='File to write log messages to')
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self.add_argument('--color', action='store_boolean', default=True, help='color in output')
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self.add_argument('--config-file', help='The location for the configuration file')
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self.arg_only.append('config_file')
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def add_subparsers(self, title='Sub-commands', **kwargs):
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if self._inside_context_manager:
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raise RuntimeError('You must run this before the with statement!')
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self.acquire_lock()
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self._subparsers = self._arg_parser.add_subparsers(title=title, dest='subparsers', **kwargs)
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self.release_lock()
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def acquire_lock(self):
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"""Acquire the MILC lock for exclusive access to properties.
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"""
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if self._lock:
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self._lock.acquire()
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def release_lock(self):
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"""Release the MILC lock.
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"""
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if self._lock:
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self._lock.release()
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def find_config_file(self):
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"""Locate the config file.
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"""
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if self.config_file:
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return self.config_file
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if '--config-file' in sys.argv:
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return Path(sys.argv[sys.argv.index('--config-file') + 1]).expanduser().resolve()
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filedir = user_config_dir(appname='qmk', appauthor='QMK')
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filename = '%s.ini' % self.prog_name
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return Path(filedir) / filename
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def get_argument_name(self, *args, **kwargs):
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"""Takes argparse arguments and returns the dest name.
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"""
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try:
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return self._arg_parser._get_optional_kwargs(*args, **kwargs)['dest']
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except ValueError:
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return self._arg_parser._get_positional_kwargs(*args, **kwargs)['dest']
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def argument(self, *args, **kwargs):
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"""Decorator to call self.add_argument or self.<subcommand>.add_argument.
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"""
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if self._inside_context_manager:
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raise RuntimeError('You must run this before the with statement!')
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def argument_function(handler):
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if 'arg_only' in kwargs and kwargs['arg_only']:
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arg_name = self.get_argument_name(*args, **kwargs)
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self.arg_only.append(arg_name)
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del kwargs['arg_only']
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name = handler.__name__.replace("_", "-")
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if handler is self._entrypoint:
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self.add_argument(*args, **kwargs)
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elif name in self.subcommands:
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self.subcommands[name].add_argument(*args, **kwargs)
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else:
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raise RuntimeError('Decorated function is not entrypoint or subcommand!')
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return handler
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return argument_function
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def arg_passed(self, arg):
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"""Returns True if arg was passed on the command line.
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"""
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return self.default_arguments.get(arg) != self.args[arg]
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def parse_args(self):
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"""Parse the CLI args.
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"""
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if self.args:
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self.log.debug('Warning: Arguments have already been parsed, ignoring duplicate attempt!')
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return
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argcomplete.autocomplete(self._arg_parser)
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self.acquire_lock()
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self.args = self._arg_parser.parse_args()
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if 'entrypoint' in self.args:
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self._entrypoint = self.args.entrypoint
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self.release_lock()
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def read_config_file(self):
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"""Read in the configuration file and store it in self.config.
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"""
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self.acquire_lock()
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self.config = Configuration()
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self.config_file = self.find_config_file()
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if self.config_file and self.config_file.exists():
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config = RawConfigParser(self.config)
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config.read(str(self.config_file))
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# Iterate over the config file options and write them into self.config
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for section in config.sections():
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for option in config.options(section):
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value = config.get(section, option)
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# Coerce values into useful datatypes
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if value.lower() in ['1', 'yes', 'true', 'on']:
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value = True
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elif value.lower() in ['0', 'no', 'false', 'off']:
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value = False
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elif value.lower() in ['none']:
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continue
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elif value.replace('.', '').isdigit():
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if '.' in value:
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value = Decimal(value)
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else:
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value = int(value)
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self.config[section][option] = value
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self.release_lock()
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def merge_args_into_config(self):
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"""Merge CLI arguments into self.config to create the runtime configuration.
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"""
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self.acquire_lock()
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for argument in vars(self.args):
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if argument in ('subparsers', 'entrypoint'):
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continue
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if argument not in self.arg_only:
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# Find the argument's section
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# Underscores in command's names are converted to dashes during initialization.
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# TODO(Erovia) Find a better solution
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entrypoint_name = self._entrypoint.__name__.replace("_", "-")
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if entrypoint_name in self.default_arguments and argument in self.default_arguments[entrypoint_name]:
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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)
|
||
|
||
# Merge this argument into self.config
|
||
if argument in self.default_arguments['general'] or argument in self.default_arguments[entrypoint_name]:
|
||
arg_value = getattr(self.args, argument)
|
||
if arg_value is not None:
|
||
self.config[section][argument] = arg_value
|
||
else:
|
||
if argument not in self.config[entrypoint_name]:
|
||
# Check if the argument exist for this section
|
||
arg = getattr(self.args, argument)
|
||
if arg is not None:
|
||
self.config[section][argument] = arg
|
||
|
||
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 = 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.log_fmt, self.config.general.datetime_fmt)
|
||
else:
|
||
self.log_format = ANSIStrippingFormatter(self.args.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()
|