a1bf8db517
- Multi-line documentation for functions and methods now has ending triple-double-quotes on an own line, as per PEP 257. - Added documentation and comments to almost all functions and methods. - Added stub implementations for getconfig() and getsection() inside CustomConfig.ConfigHelperMixin to provide sane run-time diagnostics for classes that doesn't implement them. Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>
240 lines
8.1 KiB
Python
240 lines
8.1 KiB
Python
# Copyright (C) 2003-2012 John Goerzen & contributors
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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try:
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from ConfigParser import SafeConfigParser, Error, NoOptionError
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except ImportError: #python3
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from configparser import SafeConfigParser, Error, NoOptionError
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from offlineimap.localeval import LocalEval
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import os
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import re
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class CustomConfigParser(SafeConfigParser):
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def getdefault(self, section, option, default, *args, **kwargs):
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"""
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Same as config.get, but returns the value of `default`
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if there is no such option specified.
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"""
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if self.has_option(section, option):
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return self.get(*(section, option) + args, **kwargs)
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else:
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return default
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def getdefaultint(self, section, option, default, *args, **kwargs):
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"""
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Same as config.getint, but returns the value of `default`
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if there is no such option specified.
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"""
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if self.has_option(section, option):
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return self.getint (*(section, option) + args, **kwargs)
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else:
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return default
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def getdefaultfloat(self, section, option, default, *args, **kwargs):
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"""
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Same as config.getfloat, but returns the value of `default`
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if there is no such option specified.
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"""
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if self.has_option(section, option):
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return self.getfloat(*(section, option) + args, **kwargs)
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else:
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return default
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def getdefaultboolean(self, section, option, default, *args, **kwargs):
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"""
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Same as config.getboolean, but returns the value of `default`
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if there is no such option specified.
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"""
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if self.has_option(section, option):
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return self.getboolean(*(section, option) + args, **kwargs)
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else:
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return default
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def getlist(self, section, option, separator_re):
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"""
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Parses option as the list of values separated
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by the given regexp.
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"""
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try:
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val = self.get(section, option).strip()
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return re.split(separator_re, val)
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except re.error as e:
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raise Error("Bad split regexp '%s': %s" % \
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(separator_re, e))
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def getdefaultlist(self, section, option, default, separator_re):
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"""
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Same as getlist, but returns the value of `default`
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if there is no such option specified.
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"""
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if self.has_option(section, option):
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return self.getlist(*(section, option, separator_re))
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else:
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return default
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def getmetadatadir(self):
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metadatadir = os.path.expanduser(self.getdefault("general", "metadata", "~/.offlineimap"))
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if not os.path.exists(metadatadir):
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os.mkdir(metadatadir, 0o700)
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return metadatadir
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def getlocaleval(self):
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if self.has_option("general", "pythonfile"):
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path = os.path.expanduser(self.get("general", "pythonfile"))
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else:
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path = None
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return LocalEval(path)
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def getsectionlist(self, key):
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"""
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Returns a list of sections that start with key + " ".
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That is, if key is "Account", returns all section names that
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start with "Account ", but strips off the "Account ".
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For instance, for "Account Test", returns "Test".
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"""
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key = key + ' '
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return [x[len(key):] for x in self.sections() \
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if x.startswith(key)]
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def set_if_not_exists(self, section, option, value):
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"""
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Set a value if it does not exist yet
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This allows to set default if the user has not explicitly
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configured anything.
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"""
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if not self.has_option(section, option):
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self.set(section, option, value)
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def CustomConfigDefault():
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"""
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Just a constant that won't occur anywhere else.
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This allows us to differentiate if the user has passed in any
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default value to the getconf* functions in ConfigHelperMixin
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derived classes.
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"""
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pass
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class ConfigHelperMixin:
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"""
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Allow comfortable retrieving of config values pertaining
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to a section.
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If a class inherits from cls:`ConfigHelperMixin`, it needs
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to provide 2 functions:
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- meth:`getconfig` (returning a CustomConfigParser object)
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- and meth:`getsection` (returning a string which represents
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the section to look up).
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All calls to getconf* will then return the configuration values
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for the CustomConfigParser object in the specific section.
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"""
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def _confighelper_runner(self, option, default, defaultfunc, mainfunc, *args):
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"""
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Return configuration or default value for option
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that contains in section identified by getsection().
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Arguments:
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- option: name of the option to retrieve;
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- default: governs which function we will call.
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* When CustomConfigDefault is passed, we will call
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the mainfunc.
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* When any other value is passed, we will call
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the defaultfunc and the value of `default` will
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be passed as the third argument to this function.
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- defaultfunc and mainfunc: processing helpers.
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- args: additional trailing arguments that will be passed
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to all processing helpers.
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"""
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lst = [self.getsection(), option]
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if default == CustomConfigDefault:
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return mainfunc(*(lst + list(args)))
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else:
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lst.append(default)
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return defaultfunc(*(lst + list(args)))
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def getconfig(self):
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"""
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Returns CustomConfigParser object that we will use
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for all our actions.
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Must be overriden in all classes that use this mix-in.
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"""
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raise NotImplementedError("ConfigHelperMixin.getconfig() "
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"is to be overriden")
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def getsection(self):
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"""
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Returns name of configuration section in which our
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class keeps its configuration.
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Must be overriden in all classes that use this mix-in.
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"""
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raise NotImplementedError("ConfigHelperMixin.getsection() "
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"is to be overriden")
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def getconf(self, option, default = CustomConfigDefault):
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return self._confighelper_runner(option, default,
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self.getconfig().getdefault,
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self.getconfig().get)
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def getconfboolean(self, option, default = CustomConfigDefault):
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return self._confighelper_runner(option, default,
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self.getconfig().getdefaultboolean,
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self.getconfig().getboolean)
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def getconfint(self, option, default = CustomConfigDefault):
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return self._confighelper_runner(option, default,
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self.getconfig().getdefaultint,
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self.getconfig().getint)
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def getconffloat(self, option, default = CustomConfigDefault):
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return self._confighelper_runner(option, default,
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self.getconfig().getdefaultfloat,
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self.getconfig().getfloat)
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def getconflist(self, option, separator_re,
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default = CustomConfigDefault):
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return self._confighelper_runner(option, default,
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self.getconfig().getdefaultlist,
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self.getconfig().getlist, separator_re)
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