e7f6e90a22
Commandline args should be merged with the submodule's config. Compare config values to None instead of False, so empty lines and False can be used as values.
755 lines
26 KiB
Python
755 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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if self._entrypoint.__name__ in self.default_arguments and argument in self.default_arguments[self._entrypoint.__name__]:
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argument_found = True
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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[section]:
|
||
arg_value = getattr(self.args, argument)
|
||
if arg_value:
|
||
self.config[section][argument] = arg_value
|
||
else:
|
||
if argument not in self.config[section]:
|
||
# 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.rename(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()
|