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294 lines
10 KiB
294 lines
10 KiB
6 years ago
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"""Base option parser setup"""
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from __future__ import absolute_import
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import sys
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import optparse
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import os
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import re
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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._vendor.six.moves import configparser
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from pip.locations import (
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legacy_config_file, config_basename, running_under_virtualenv,
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site_config_files
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)
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from pip.utils import appdirs, get_terminal_size
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_environ_prefix_re = re.compile(r"^PIP_", re.I)
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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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isolated = False
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def __init__(self, *args, **kwargs):
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self.config = configparser.RawConfigParser()
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self.name = kwargs.pop('name')
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self.isolated = kwargs.pop("isolated", False)
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self.files = self.get_config_files()
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if self.files:
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self.config.read(self.files)
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assert self.name
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optparse.OptionParser.__init__(self, *args, **kwargs)
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def get_config_files(self):
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# the files returned by this method will be parsed in order with the
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# first files listed being overridden by later files in standard
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# ConfigParser fashion
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config_file = os.environ.get('PIP_CONFIG_FILE', False)
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if config_file == os.devnull:
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return []
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# at the base we have any site-wide configuration
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files = list(site_config_files)
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# per-user configuration next
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if not self.isolated:
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if config_file and os.path.exists(config_file):
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files.append(config_file)
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else:
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# This is the legacy config file, we consider it to be a lower
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# priority than the new file location.
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files.append(legacy_config_file)
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# This is the new config file, we consider it to be a higher
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# priority than the legacy file.
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files.append(
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os.path.join(
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appdirs.user_config_dir("pip"),
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config_basename,
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)
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)
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# finally virtualenv configuration first trumping others
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if running_under_virtualenv():
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venv_config_file = os.path.join(
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sys.prefix,
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config_basename,
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)
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if os.path.exists(venv_config_file):
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files.append(venv_config_file)
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return files
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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 _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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# Then go and look for the other sources of configuration:
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config = {}
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# 1. config files
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for section in ('global', self.name):
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config.update(
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self.normalize_keys(self.get_config_section(section))
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)
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# 2. environmental variables
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if not self.isolated:
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config.update(self.normalize_keys(self.get_environ_vars()))
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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 config.items():
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# ignore empty values
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if not val:
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continue
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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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val = strtobool(val)
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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 normalize_keys(self, items):
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"""Return a config dictionary with normalized keys regardless of
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whether the keys were specified in environment variables or in config
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files"""
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normalized = {}
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for key, val in items:
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key = key.replace('_', '-')
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if not key.startswith('--'):
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key = '--%s' % key # only prefer long opts
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normalized[key] = val
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return normalized
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def get_config_section(self, name):
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"""Get a section of a configuration"""
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if self.config.has_section(name):
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return self.config.items(name)
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return []
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def get_environ_vars(self):
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"""Returns a generator with all environmental vars with prefix PIP_"""
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for key, val in os.environ.items():
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if _environ_prefix_re.search(key):
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yield (_environ_prefix_re.sub("", key).lower(), val)
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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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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(2, "%s\n" % msg)
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