VirtualMailManager/cli/Config.py
author Pascal Volk <neverseen@users.sourceforge.net>
Tue, 27 Jul 2010 14:35:55 +0000
branchv0.6.x
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.cli.CliConfig
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Adds some interactive stuff to the Config class.
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"""
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from ConfigParser import RawConfigParser
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from shutil import copy2
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from VirtualMailManager import ENCODING
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from VirtualMailManager.Config import Config, ConfigValueError, LazyConfig
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from VirtualMailManager.errors import ConfigError
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from VirtualMailManager.cli import w_err, w_std
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from VirtualMailManager.constants import VMM_TOO_MANY_FAILURES
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_ = lambda msg: msg
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class CliConfig(Config):
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    """Adds the interactive ``configure`` method to the `Config` class
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    and overwrites `LazyConfig.set(), in order to update a single option
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    in the configuration file with a single command line command.
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    """
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    def configure(self, sections):
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        """Interactive method for configuring all options of the given
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        iterable ``sections`` object."""
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        input_fmt = _(u'Enter new value for option %(option)s '
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                      u'[%(current_value)s]: ')
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        failures = 0
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        w_std(_(u'Using configuration file: %s\n') % self._cfg_filename)
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        for section in sections:
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            w_std(_(u'* Configuration section: %r') % section)
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            for opt, val in self.items(section):
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                failures = 0
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                while True:
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                    newval = raw_input(input_fmt.encode(ENCODING, 'replace') %
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                                       {'option': opt, 'current_value': val})
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                    if newval and newval != val:
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                        try:
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                            LazyConfig.set(self, '%s.%s' % (section, opt),
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                                           newval)
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                            break
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                        except (ValueError, ConfigValueError), err:
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                            w_err(0, _(u'Warning: %s') % err)
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                            failures += 1
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                            if failures > 2:
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                                raise ConfigError(_(u'Too many failures - try '
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                                                    u'again later.'),
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                                                  VMM_TOO_MANY_FAILURES)
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                    else:
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                        break
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            print
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        if self._modified:
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            self.__save_changes()
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    def set(self, option, value):
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        """Set the value of an option.
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        If the new `value` has been set, the configuration file will be
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        immediately updated.
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        Throws a ``ValueError`` if `value` couldn't be converted to
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        ``LazyConfigOption.cls``"""
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        section, option_ = self._get_section_option(option)
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        val = self._cfg[section][option_].cls(value)
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        if self._cfg[section][option_].validate:
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            val = self._cfg[section][option_].validate(val)
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        # Do not write default values also skip identical values
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        if not self._cfg[section][option_].default is None:
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            old_val = self.dget(option)
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        else:
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            old_val = self.pget(option)
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        if val == old_val:
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            return
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        if not RawConfigParser.has_section(self, section):
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            self.add_section(section)
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        RawConfigParser.set(self, section, option_, val)
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        self.__save_changes()
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    def __save_changes(self):
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        """Writes changes to the configuration file."""
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        copy2(self._cfg_filename, self._cfg_filename + '.bak')
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        self._cfg_file = open(self._cfg_filename, 'w')
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        self.write(self._cfg_file)
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        self._cfg_file.close()
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del _