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""" Option grouping classes """
import re
import copy
import fnmatch
from Bcfg2.Options import Option
from itertools import chain
__all__ = ["OptionGroup", "ExclusiveOptionGroup", "Subparser",
"WildcardSectionGroup"]
class OptionContainer(list):
""" Parent class of all option groups """
def list_options(self):
""" Get a list of all options contained in this group,
including options contained in option groups in this group,
and so on. """
return list(chain(*[o.list_options() for o in self]))
def __repr__(self):
return "%s(%s)" % (self.__class__.__name__, list.__repr__(self))
def add_to_parser(self, parser):
""" Add this option group to a :class:`Bcfg2.Options.Parser`
object. """
for opt in self:
opt.add_to_parser(parser)
class OptionGroup(OptionContainer):
""" Generic option group that is used only to organize options.
This uses :meth:`argparse.ArgumentParser.add_argument_group`
behind the scenes. """
def __init__(self, *items, **kwargs):
r"""
:param \*args: Child options
:type \*args: Bcfg2.Options.Option
:param title: The title of the option group
:type title: string
:param description: A longer description of the option group
:param description: string
"""
OptionContainer.__init__(self, items)
self.title = kwargs.pop('title')
self.description = kwargs.pop('description', None)
def add_to_parser(self, parser):
group = parser.add_argument_group(self.title, self.description)
OptionContainer.add_to_parser(self, group)
class ExclusiveOptionGroup(OptionContainer):
""" Option group that ensures that only one argument in the group
is present. This uses
:meth:`argparse.ArgumentParser.add_mutually_exclusive_group`
behind the scenes."""
def __init__(self, *items, **kwargs):
r"""
:param \*args: Child options
:type \*args: Bcfg2.Options.Option
:param required: Exactly one argument in the group *must* be
specified.
:type required: boolean
"""
OptionContainer.__init__(self, items)
self.required = kwargs.pop('required', False)
def add_to_parser(self, parser):
group = parser.add_mutually_exclusive_group(required=self.required)
OptionContainer.add_to_parser(self, group)
class Subparser(OptionContainer):
""" Option group that adds options in it to a subparser. This
uses a lot of functionality tied to `argparse Sub-commands
<http://docs.python.org/dev/library/argparse.html#sub-commands>`_.
The subcommand string itself is stored in the
:attr:`Bcfg2.Options.setup` namespace as ``subcommand``.
This is commonly used with :class:`Bcfg2.Options.Subcommand`
groups.
"""
_subparsers = dict()
def __init__(self, *items, **kwargs):
r"""
:param \*args: Child options
:type \*args: Bcfg2.Options.Option
:param name: The name of the subparser. Required.
:type name: string
:param help: A help message for the subparser
:param help: string
"""
self.name = kwargs.pop('name')
self.help = kwargs.pop('help', None)
OptionContainer.__init__(self, items)
def __repr__(self):
return "%s %s(%s)" % (self.__class__.__name__,
self.name,
list.__repr__(self))
def add_to_parser(self, parser):
if parser not in self._subparsers:
self._subparsers[parser] = parser.add_subparsers(dest='subcommand')
subparser = self._subparsers[parser].add_parser(self.name,
help=self.help)
OptionContainer.add_to_parser(self, subparser)
class WildcardSectionGroup(OptionContainer, Option):
""" WildcardSectionGroups contain options that may exist in
several different sections of the config that match a glob. It
works by creating options on the fly to match the sections
described in the glob. For example, consider:
.. code-block:: python
options = [
Bcfg2.Options.WildcardSectionGroup(
Bcfg2.Options.Option(cf=("myplugin:*", "number"), type=int),
Bcfg2.Options.Option(cf=("myplugin:*", "description"))]
If the config file contained ``[myplugin:foo]`` and
``[myplugin:bar]`` sections, then this would automagically create
options for each of those. The end result would be:
.. code-block:: python
>>> Bcfg2.Options.setup
Namespace(myplugin_bar_description='Bar description', myplugin_bar_number=2, myplugin_foo_description='Foo description', myplugin_foo_number=1, myplugin_sections=['myplugin:foo', 'myplugin:bar'])
All options must have the same section glob.
The options are stored in an automatically-generated destination
given by::
<prefix><section>_<destination>
``<destination>`` is the original `dest
<http://docs.python.org/dev/library/argparse.html#dest>`_ of the
option. ``<section>`` is the section that it's found in.
``<prefix>`` is automatically generated from the section glob by
replacing all consecutive characters disallowed in Python variable
names into underscores. (This can be overridden with the
constructor.)
This group stores an additional option, the sections themselves,
in an option given by ``<prefix>sections``.
"""
#: Regex to automatically get a destination for this option
_dest_re = re.compile(r'(\A(_|[^A-Za-z])+)|((_|[^A-Za-z0-9])+)')
def __init__(self, *items, **kwargs):
r"""
:param \*args: Child options
:type \*args: Bcfg2.Options.Option
:param prefix: The prefix to use for options generated by this
option group. By default this is generated
automatically from the config glob; see above
for details.
:type prefix: string
:param dest: The destination for the list of known sections
that match the glob.
:param dest: string
"""
OptionContainer.__init__(self, [])
self._section_glob = items[0].cf[0]
# get a default destination
self._prefix = kwargs.get("prefix",
self._dest_re.sub('_', self._section_glob))
Option.__init__(self, dest=kwargs.get('dest',
self._prefix + "sections"))
self._options = items
def list_options(self):
return [self] + OptionContainer.list_options(self)
def from_config(self, cfp):
sections = []
for section in cfp.sections():
if fnmatch.fnmatch(section, self._section_glob):
sections.append(section)
newopts = []
for opt_tmpl in self._options:
option = copy.deepcopy(opt_tmpl)
option.cf = (section, option.cf[1])
option.dest = self._prefix + section + "_" + option.dest
newopts.append(option)
self.extend(newopts)
for parser in self.parsers:
parser.add_options(newopts)
return sections
def add_to_parser(self, parser):
Option.add_to_parser(self, parser)
OptionContainer.add_to_parser(self, parser)
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