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# Copyright (C) 2003-2016 John Goerzen & contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import os
import re
from sys import exc_info
from configparser import SafeConfigParser, Error
from offlineimap.localeval import LocalEval
class CustomConfigParser(SafeConfigParser):
def __init__(self):
SafeConfigParser.__init__(self)
self.localeval = None
def getdefault(self, section, option, default, *args, **kwargs):
"""Same as config.get, but returns the value of `default`
if there is no such option specified."""
if self.has_option(section, option):
return self.get(*(section, option) + args, **kwargs)
else:
return default
def getdefaultint(self, section, option, default, *args, **kwargs):
"""Same as config.getint, but returns the value of `default`
if there is no such option specified."""
if self.has_option(section, option):
return self.getint(*(section, option) + args, **kwargs)
else:
return default
def getdefaultfloat(self, section, option, default, *args, **kwargs):
"""Same as config.getfloat, but returns the value of `default`
if there is no such option specified."""
if self.has_option(section, option):
return self.getfloat(*(section, option) + args, **kwargs)
else:
return default
def getdefaultboolean(self, section, option, default, *args, **kwargs):
"""Same as config.getboolean, but returns the value of `default`
if there is no such option specified."""
if self.has_option(section, option):
return self.getboolean(*(section, option) + args, **kwargs)
else:
return default
def getlist(self, section, option, separator_re):
"""Parses option as the list of values separated
by the given regexp."""
try:
val = self.get(section, option).strip()
return re.split(separator_re, val)
except re.error as e:
raise Error("Bad split regexp '%s': %s" %
(separator_re, e), exc_info()[2])
def getdefaultlist(self, section, option, default, separator_re):
"""Same as getlist, but returns the value of `default`
if there is no such option specified."""
if self.has_option(section, option):
return self.getlist(*(section, option, separator_re))
else:
return default
def getmetadatadir(self):
xforms = [os.path.expanduser, os.path.expandvars]
d = self.getdefault("general", "metadata", "~/.offlineimap")
metadatadir = self.apply_xforms(d, xforms)
if not os.path.exists(metadatadir):
os.mkdir(metadatadir, 0o700)
return metadatadir
def getlocaleval(self):
# We already loaded pythonfile, so return this copy.
if self.localeval is not None:
return self.localeval
xforms = [os.path.expanduser, os.path.expandvars]
if self.has_option("general", "pythonfile"):
path = self.get("general", "pythonfile")
path = self.apply_xforms(path, xforms)
else:
path = None
self.localeval = LocalEval(path)
return self.localeval
def getsectionlist(self, key):
"""Returns a list of sections that start with (str) key + " ".
That is, if key is "Account", returns all section names that
start with "Account ", but strips off the "Account ".
For instance, for "Account Test", returns "Test"."""
key = key + ' '
return [x[len(key):] for x in self.sections()
if x.startswith(key)]
def set_if_not_exists(self, section, option, value):
"""Set a value if it does not exist yet.
This allows to set default if the user has not explicitly
configured anything."""
if not self.has_option(section, option):
self.set(section, option, value)
def apply_xforms(self, string, transforms):
"""Applies set of transformations to a string.
Arguments:
- string: source string; if None, then no processing will
take place.
- transforms: iterable that returns transformation function
on each turn.
Returns transformed string."""
if string is None:
return None
for f in transforms:
string = f(string)
return string
def CustomConfigDefault():
"""Just a constant that won't occur anywhere else.
This allows us to differentiate if the user has passed in any
default value to the getconf* functions in ConfigHelperMixin
derived classes."""
pass
class ConfigHelperMixin:
"""Allow comfortable retrieving of config values pertaining
to a section.
If a class inherits from cls:`ConfigHelperMixin`, it needs
to provide 2 functions:
- meth:`getconfig` (returning a CustomConfigParser object)
- and meth:`getsection` (returning a string which represents
the section to look up).
All calls to getconf* will then return the configuration values
for the CustomConfigParser object in the specific section.
"""
def _confighelper_runner(self, option, default, defaultfunc, mainfunc, *args):
"""Returns configuration or default value for option
that contains in section identified by getsection().
Arguments:
- option: name of the option to retrieve;
- default: governs which function we will call.
* When CustomConfigDefault is passed, we will call
the mainfunc.
* When any other value is passed, we will call
the defaultfunc and the value of `default` will
be passed as the third argument to this function.
- defaultfunc and mainfunc: processing helpers.
- args: additional trailing arguments that will be passed
to all processing helpers.
"""
lst = [self.getsection(), option]
if default == CustomConfigDefault:
return mainfunc(*(lst + list(args)))
else:
lst.append(default)
return defaultfunc(*(lst + list(args)))
def getconfig(self):
"""Returns CustomConfigParser object that we will use
for all our actions.
Must be overriden in all classes that use this mix-in."""
raise NotImplementedError("ConfigHelperMixin.getconfig() "
"is to be overriden")
def getsection(self):
"""Returns name of configuration section in which our
class keeps its configuration.
Must be overriden in all classes that use this mix-in."""
raise NotImplementedError("ConfigHelperMixin.getsection() "
"is to be overriden")
def getconf(self, option, default=CustomConfigDefault):
"""Retrieves string from the configuration.
Arguments:
- option: option name whose value is to be retrieved;
- default: default return value if no such option
exists.
"""
return self._confighelper_runner(option, default,
self.getconfig().getdefault,
self.getconfig().get)
def getconf_xform(self, option, xforms, default=CustomConfigDefault):
"""Retrieves string from the configuration transforming the result.
Arguments:
- option: option name whose value is to be retrieved;
- xforms: iterable that returns transform functions
to be applied to the value of the option,
both retrieved and default one;
- default: default value for string if no such option
exists.
"""
value = self.getconf(option, default)
return self.getconfig().apply_xforms(value, xforms)
def getconfboolean(self, option, default=CustomConfigDefault):
"""Retrieves boolean value from the configuration.
Arguments:
- option: option name whose value is to be retrieved;
- default: default return value if no such option
exists.
"""
return self._confighelper_runner(option, default,
self.getconfig().getdefaultboolean,
self.getconfig().getboolean)
def getconfint(self, option, default=CustomConfigDefault):
"""
Retrieves integer value from the configuration.
Arguments:
- option: option name whose value is to be retrieved;
- default: default return value if no such option
exists.
"""
return self._confighelper_runner(option, default,
self.getconfig().getdefaultint,
self.getconfig().getint)
def getconffloat(self, option, default=CustomConfigDefault):
"""Retrieves floating-point value from the configuration.
Arguments:
- option: option name whose value is to be retrieved;
- default: default return value if no such option
exists.
"""
return self._confighelper_runner(option, default,
self.getconfig().getdefaultfloat,
self.getconfig().getfloat)
def getconflist(self, option, separator_re,
default=CustomConfigDefault):
"""Retrieves strings from the configuration and splits it
into the list of strings.
Arguments:
- option: option name whose value is to be retrieved;
- separator_re: regular expression for separator
to be used for split operation;
- default: default return value if no such option
exists.
"""
return self._confighelper_runner(option, default,
self.getconfig().getdefaultlist,
self.getconfig().getlist, separator_re)
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