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"""
This file is part of notmuch.
Notmuch 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 3 of the License, or (at your
option) any later version.
Notmuch 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 notmuch. If not, see <http://www.gnu.org/licenses/>.
Copyright 2010 Sebastian Spaeth <Sebastian@SSpaeth.de>
"""
from ctypes import c_char_p
from .globals import (
nmlib,
NotmuchMessageP,
NotmuchFilenamesP,
Python3StringMixIn,
)
from .errors import (
NullPointerError,
NotInitializedError,
)
class Filenames(Python3StringMixIn):
"""Represents a list of filenames as returned by notmuch
Objects of this class implement the iterator protocol.
.. note::
The underlying library only provides a one-time iterator (it
cannot reset the iterator to the start). Thus iterating over
the function will "exhaust" the list of tags, and a subsequent
iteration attempt will raise a
:exc:`NotInitializedError`. Also note, that any function that
uses iteration (nearly all) will also exhaust the tags. So
both::
for name in filenames: print name
as well as::
number_of_names = len(names)
and even a simple::
#str() iterates over all tags to construct a space separated list
print(str(filenames))
will "exhaust" the Filenames. However, you can use
:meth:`Message.get_filenames` repeatedly to get fresh
Filenames objects to perform various actions on filenames.
"""
#notmuch_filenames_get
_get = nmlib.notmuch_filenames_get
_get.argtypes = [NotmuchFilenamesP]
_get.restype = c_char_p
def __init__(self, files_p, parent):
"""
:param files_p: A pointer to an underlying *notmuch_tags_t*
structure. These are not publically exposed, so a user
will almost never instantiate a :class:`Tags` object
herself. They are usually handed back as a result,
e.g. in :meth:`Database.get_all_tags`. *tags_p* must be
valid, we will raise an :exc:`NullPointerError`
if it is `None`.
:type files_p: :class:`ctypes.c_void_p`
:param parent: The parent object (ie :class:`Message` these
filenames are derived from, and saves a
reference to it, so we can automatically delete the db object
once all derived objects are dead.
"""
if not files_p:
raise NullPointerError()
self._files_p = files_p
#save reference to parent object so we keep it alive
self._parent = parent
def __iter__(self):
""" Make Filenames an iterator """
return self
_valid = nmlib.notmuch_filenames_valid
_valid.argtypes = [NotmuchFilenamesP]
_valid.restype = bool
_move_to_next = nmlib.notmuch_filenames_move_to_next
_move_to_next.argtypes = [NotmuchFilenamesP]
_move_to_next.restype = None
def __next__(self):
if not self._files_p:
raise NotInitializedError()
if not self._valid(self._files_p):
self._files_p = None
raise StopIteration
file_ = Filenames._get(self._files_p)
self._move_to_next(self._files_p)
return file_.decode('utf-8', 'ignore')
next = __next__ # python2.x iterator protocol compatibility
def __unicode__(self):
"""Represent Filenames() as newline-separated list of full paths
.. note::
This method exhausts the iterator object, so you will not be able to
iterate over them again.
"""
return "\n".join(self)
_destroy = nmlib.notmuch_filenames_destroy
_destroy.argtypes = [NotmuchMessageP]
_destroy.restype = None
def __del__(self):
"""Close and free the notmuch filenames"""
if self._files_p:
self._destroy(self._files_p)
def __len__(self):
"""len(:class:`Filenames`) returns the number of contained files
.. note::
This method exhausts the iterator object, so you will not be able to
iterate over them again.
"""
if not self._files_p:
raise NotInitializedError()
i = 0
while self._valid(self._files_p):
self._move_to_next(self._files_p)
i += 1
self._files_p = None
return i
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