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225 lines
8.0 KiB
Python
225 lines
8.0 KiB
Python
"""Base option parser setup"""
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import sys
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import optparse
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import os
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import textwrap
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from distutils.util import strtobool
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from pip.backwardcompat import ConfigParser, string_types
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from pip.locations import default_config_file
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from pip.util import get_terminal_size, get_prog
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from pip._vendor import pkg_resources
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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 inital 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 that updates
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the defaults before expanding them, allowing them to show up correctly
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in the help listing"""
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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.config = ConfigParser.RawConfigParser()
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self.name = kwargs.pop('name')
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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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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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if config_file and os.path.exists(config_file):
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return [config_file]
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return [default_config_file]
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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:
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e = sys.exc_info()[1]
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print("An error occurred during configuration: %s" % e)
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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(self.normalize_keys(self.get_config_section(section)))
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# 2. environmental variables
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config.update(self.normalize_keys(self.get_environ_vars()))
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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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option = self.get_option(key)
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if option is not None:
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# ignore empty values
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if not val:
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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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if 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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else:
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val = self.check_default(option, key, val)
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defaults[option.dest] = val
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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, prefix='PIP_'):
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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 key.startswith(prefix):
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yield (key.replace(prefix, '').lower(), val)
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def get_default_values(self):
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"""Overridding 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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