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262 lines
9.2 KiB
Python
262 lines
9.2 KiB
Python
5 years ago
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"""Base option parser setup"""
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from __future__ import absolute_import
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import logging
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import optparse
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import sys
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import textwrap
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from distutils.util import strtobool
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from pip._vendor.six import string_types
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from pip._internal.cli.status_codes import UNKNOWN_ERROR
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from pip._internal.configuration import Configuration, ConfigurationError
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from pip._internal.utils.compat import get_terminal_size
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logger = logging.getLogger(__name__)
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class PrettyHelpFormatter(optparse.IndentedHelpFormatter):
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"""A prettier/less verbose help formatter for optparse."""
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def __init__(self, *args, **kwargs):
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# help position must be aligned with __init__.parseopts.description
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kwargs['max_help_position'] = 30
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kwargs['indent_increment'] = 1
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kwargs['width'] = get_terminal_size()[0] - 2
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optparse.IndentedHelpFormatter.__init__(self, *args, **kwargs)
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def format_option_strings(self, option):
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return self._format_option_strings(option, ' <%s>', ', ')
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def _format_option_strings(self, option, mvarfmt=' <%s>', optsep=', '):
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"""
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Return a comma-separated list of option strings and metavars.
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:param option: tuple of (short opt, long opt), e.g: ('-f', '--format')
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:param mvarfmt: metavar format string - evaluated as mvarfmt % metavar
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:param optsep: separator
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"""
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opts = []
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if option._short_opts:
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opts.append(option._short_opts[0])
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if option._long_opts:
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opts.append(option._long_opts[0])
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if len(opts) > 1:
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opts.insert(1, optsep)
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if option.takes_value():
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metavar = option.metavar or option.dest.lower()
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opts.append(mvarfmt % metavar.lower())
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return ''.join(opts)
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def format_heading(self, heading):
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if heading == 'Options':
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return ''
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return heading + ':\n'
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def format_usage(self, usage):
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"""
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Ensure there is only one newline between usage and the first heading
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if there is no description.
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"""
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msg = '\nUsage: %s\n' % self.indent_lines(textwrap.dedent(usage), " ")
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return msg
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def format_description(self, description):
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# leave full control over description to us
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if description:
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if hasattr(self.parser, 'main'):
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label = 'Commands'
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else:
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label = 'Description'
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# some doc strings have initial newlines, some don't
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description = description.lstrip('\n')
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# some doc strings have final newlines and spaces, some don't
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description = description.rstrip()
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# dedent, then reindent
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description = self.indent_lines(textwrap.dedent(description), " ")
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description = '%s:\n%s\n' % (label, description)
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return description
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else:
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return ''
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def format_epilog(self, epilog):
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# leave full control over epilog to us
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if epilog:
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return epilog
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else:
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return ''
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def indent_lines(self, text, indent):
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new_lines = [indent + line for line in text.split('\n')]
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return "\n".join(new_lines)
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class UpdatingDefaultsHelpFormatter(PrettyHelpFormatter):
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"""Custom help formatter for use in ConfigOptionParser.
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This is updates the defaults before expanding them, allowing
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them to show up correctly in the help listing.
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"""
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def expand_default(self, option):
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if self.parser is not None:
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self.parser._update_defaults(self.parser.defaults)
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return optparse.IndentedHelpFormatter.expand_default(self, option)
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class CustomOptionParser(optparse.OptionParser):
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def insert_option_group(self, idx, *args, **kwargs):
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"""Insert an OptionGroup at a given position."""
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group = self.add_option_group(*args, **kwargs)
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self.option_groups.pop()
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self.option_groups.insert(idx, group)
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return group
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@property
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def option_list_all(self):
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"""Get a list of all options, including those in option groups."""
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res = self.option_list[:]
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for i in self.option_groups:
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res.extend(i.option_list)
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return res
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class ConfigOptionParser(CustomOptionParser):
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"""Custom option parser which updates its defaults by checking the
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configuration files and environmental variables"""
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def __init__(self, *args, **kwargs):
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self.name = kwargs.pop('name')
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isolated = kwargs.pop("isolated", False)
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self.config = Configuration(isolated)
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assert self.name
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optparse.OptionParser.__init__(self, *args, **kwargs)
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def check_default(self, option, key, val):
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try:
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return option.check_value(key, val)
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except optparse.OptionValueError as exc:
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print("An error occurred during configuration: %s" % exc)
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sys.exit(3)
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def _get_ordered_configuration_items(self):
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# Configuration gives keys in an unordered manner. Order them.
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override_order = ["global", self.name, ":env:"]
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# Pool the options into different groups
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section_items = {name: [] for name in override_order}
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for section_key, val in self.config.items():
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# ignore empty values
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if not val:
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logger.debug(
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"Ignoring configuration key '%s' as it's value is empty.",
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section_key
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)
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continue
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section, key = section_key.split(".", 1)
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if section in override_order:
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section_items[section].append((key, val))
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# Yield each group in their override order
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for section in override_order:
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for key, val in section_items[section]:
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yield key, val
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def _update_defaults(self, defaults):
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"""Updates the given defaults with values from the config files and
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the environ. Does a little special handling for certain types of
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options (lists)."""
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# Accumulate complex default state.
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self.values = optparse.Values(self.defaults)
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late_eval = set()
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# Then set the options with those values
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for key, val in self._get_ordered_configuration_items():
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# '--' because configuration supports only long names
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option = self.get_option('--' + key)
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# Ignore options not present in this parser. E.g. non-globals put
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# in [global] by users that want them to apply to all applicable
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# commands.
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if option is None:
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continue
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if option.action in ('store_true', 'store_false', 'count'):
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try:
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val = strtobool(val)
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except ValueError:
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error_msg = invalid_config_error_message(
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option.action, key, val
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)
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self.error(error_msg)
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elif option.action == 'append':
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val = val.split()
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val = [self.check_default(option, key, v) for v in val]
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elif option.action == 'callback':
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late_eval.add(option.dest)
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opt_str = option.get_opt_string()
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val = option.convert_value(opt_str, val)
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# From take_action
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args = option.callback_args or ()
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kwargs = option.callback_kwargs or {}
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option.callback(option, opt_str, val, self, *args, **kwargs)
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else:
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val = self.check_default(option, key, val)
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defaults[option.dest] = val
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for key in late_eval:
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defaults[key] = getattr(self.values, key)
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self.values = None
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return defaults
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def get_default_values(self):
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"""Overriding to make updating the defaults after instantiation of
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the option parser possible, _update_defaults() does the dirty work."""
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if not self.process_default_values:
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# Old, pre-Optik 1.5 behaviour.
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return optparse.Values(self.defaults)
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# Load the configuration, or error out in case of an error
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try:
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self.config.load()
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except ConfigurationError as err:
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self.exit(UNKNOWN_ERROR, str(err))
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defaults = self._update_defaults(self.defaults.copy()) # ours
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for option in self._get_all_options():
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default = defaults.get(option.dest)
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if isinstance(default, string_types):
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opt_str = option.get_opt_string()
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defaults[option.dest] = option.check_value(opt_str, default)
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return optparse.Values(defaults)
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def error(self, msg):
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self.print_usage(sys.stderr)
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self.exit(UNKNOWN_ERROR, "%s\n" % msg)
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def invalid_config_error_message(action, key, val):
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"""Returns a better error message when invalid configuration option
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is provided."""
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if action in ('store_true', 'store_false'):
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return ("{0} is not a valid value for {1} option, "
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"please specify a boolean value like yes/no, "
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"true/false or 1/0 instead.").format(val, key)
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return ("{0} is not a valid value for {1} option, "
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"please specify a numerical value like 1/0 "
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"instead.").format(val, key)
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