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"""Base option parser setup"""
from __future__ import absolute_import
import sys
import optparse
import os
import re
import textwrap
from distutils.util import strtobool
from pip._vendor.six import string_types
from pip._vendor.six.moves import configparser
from pip.locations import (
legacy_config_file, config_basename, running_under_virtualenv,
from pip.utils import appdirs, get_terminal_size
_environ_prefix_re = re.compile(r"^PIP_", re.I)
class PrettyHelpFormatter(optparse.IndentedHelpFormatter):
"""A prettier/less verbose help formatter for optparse."""
def __init__(self, *args, **kwargs):
# help position must be aligned with __init__.parseopts.description
kwargs['max_help_position'] = 30
kwargs['indent_increment'] = 1
kwargs['width'] = get_terminal_size()[0] - 2
optparse.IndentedHelpFormatter.__init__(self, *args, **kwargs)
def format_option_strings(self, option):
return self._format_option_strings(option, ' <%s>', ', ')
def _format_option_strings(self, option, mvarfmt=' <%s>', optsep=', '):
Return a comma-separated list of option strings and metavars.
:param option: tuple of (short opt, long opt), e.g: ('-f', '--format')
:param mvarfmt: metavar format string - evaluated as mvarfmt % metavar
:param optsep: separator
opts = []
if option._short_opts:
if option._long_opts:
if len(opts) > 1:
opts.insert(1, optsep)
if option.takes_value():
metavar = option.metavar or option.dest.lower()
opts.append(mvarfmt % metavar.lower())
return ''.join(opts)
def format_heading(self, heading):
if heading == 'Options':
return ''
return heading + ':\n'
def format_usage(self, usage):
Ensure there is only one newline between usage and the first heading
if there is no description.
msg = '\nUsage: %s\n' % self.indent_lines(textwrap.dedent(usage), " ")
return msg
def format_description(self, description):
# leave full control over description to us
if description:
if hasattr(self.parser, 'main'):
label = 'Commands'
label = 'Description'
# some doc strings have initial newlines, some don't
description = description.lstrip('\n')
# some doc strings have final newlines and spaces, some don't
description = description.rstrip()
# dedent, then reindent
description = self.indent_lines(textwrap.dedent(description), " ")
description = '%s:\n%s\n' % (label, description)
return description
return ''
def format_epilog(self, epilog):
# leave full control over epilog to us
if epilog:
return epilog
return ''
def indent_lines(self, text, indent):
new_lines = [indent + line for line in text.split('\n')]
return "\n".join(new_lines)
class UpdatingDefaultsHelpFormatter(PrettyHelpFormatter):
"""Custom help formatter for use in ConfigOptionParser.
This is updates the defaults before expanding them, allowing
them to show up correctly in the help listing.
def expand_default(self, option):
if self.parser is not None:
return optparse.IndentedHelpFormatter.expand_default(self, option)
class CustomOptionParser(optparse.OptionParser):
def insert_option_group(self, idx, *args, **kwargs):
"""Insert an OptionGroup at a given position."""
group = self.add_option_group(*args, **kwargs)
self.option_groups.insert(idx, group)
return group
def option_list_all(self):
"""Get a list of all options, including those in option groups."""
res = self.option_list[:]
for i in self.option_groups:
return res
class ConfigOptionParser(CustomOptionParser):
"""Custom option parser which updates its defaults by checking the
configuration files and environmental variables"""
isolated = False
def __init__(self, *args, **kwargs):
self.config = configparser.RawConfigParser() = kwargs.pop('name')
self.isolated = kwargs.pop("isolated", False)
self.files = self.get_config_files()
if self.files:
optparse.OptionParser.__init__(self, *args, **kwargs)
def get_config_files(self):
# the files returned by this method will be parsed in order with the
# first files listed being overridden by later files in standard
# ConfigParser fashion
config_file = os.environ.get('PIP_CONFIG_FILE', False)
if config_file == os.devnull:
return []
# at the base we have any site-wide configuration
files = list(site_config_files)
# per-user configuration next
if not self.isolated:
if config_file and os.path.exists(config_file):
# This is the legacy config file, we consider it to be a lower
# priority than the new file location.
# This is the new config file, we consider it to be a higher
# priority than the legacy file.
# finally virtualenv configuration first trumping others
if running_under_virtualenv():
venv_config_file = os.path.join(
if os.path.exists(venv_config_file):
return files
def check_default(self, option, key, val):
return option.check_value(key, val)
except optparse.OptionValueError as exc:
print("An error occurred during configuration: %s" % exc)
def _update_defaults(self, defaults):
"""Updates the given defaults with values from the config files and
the environ. Does a little special handling for certain types of
options (lists)."""
# Then go and look for the other sources of configuration:
config = {}
# 1. config files
for section in ('global',
# 2. environmental variables
if not self.isolated:
# Accumulate complex default state.
self.values = optparse.Values(self.defaults)
late_eval = set()
# Then set the options with those values
for key, val in config.items():
# ignore empty values
if not val:
option = self.get_option(key)
# Ignore options not present in this parser. E.g. non-globals put
# in [global] by users that want them to apply to all applicable
# commands.
if option is None:
if option.action in ('store_true', 'store_false', 'count'):
val = strtobool(val)
elif option.action == 'append':
val = val.split()
val = [self.check_default(option, key, v) for v in val]
elif option.action == 'callback':
opt_str = option.get_opt_string()
val = option.convert_value(opt_str, val)
# From take_action
args = option.callback_args or ()
kwargs = option.callback_kwargs or {}
option.callback(option, opt_str, val, self, *args, **kwargs)
val = self.check_default(option, key, val)
defaults[option.dest] = val
for key in late_eval:
defaults[key] = getattr(self.values, key)
self.values = None
return defaults
def normalize_keys(self, items):
"""Return a config dictionary with normalized keys regardless of
whether the keys were specified in environment variables or in config
normalized = {}
for key, val in items:
key = key.replace('_', '-')
if not key.startswith('--'):
key = '--%s' % key # only prefer long opts
normalized[key] = val
return normalized
def get_config_section(self, name):
"""Get a section of a configuration"""
if self.config.has_section(name):
return self.config.items(name)
return []
def get_environ_vars(self):
"""Returns a generator with all environmental vars with prefix PIP_"""
for key, val in os.environ.items():
yield (_environ_prefix_re.sub("", key).lower(), val)
def get_default_values(self):
"""Overriding to make updating the defaults after instantiation of
the option parser possible, _update_defaults() does the dirty work."""
if not self.process_default_values:
# Old, pre-Optik 1.5 behaviour.
return optparse.Values(self.defaults)
defaults = self._update_defaults(self.defaults.copy()) # ours
for option in self._get_all_options():
default = defaults.get(option.dest)
if isinstance(default, string_types):
opt_str = option.get_opt_string()
defaults[option.dest] = option.check_value(opt_str, default)
return optparse.Values(defaults)
def error(self, msg):
self.exit(2, "%s\n" % msg)
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