from ctypes import c_char_p, c_void_p, c_int64 from datetime import date from cnotmuch.globals import nmlib, STATUS, NotmuchError from cnotmuch.tag import Tags #------------------------------------------------------------------------------ class Messages(object): """Represents a list of notmuch messages This object provides an iterator over a list of notmuch messages (Technically, it provides a wrapper for the underlying *notmuch_messages_t* structure). Do note that 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 messages, and a subsequent iteration attempt will raise a :exc:`NotmuchError` STATUS.NOT_INITIALIZED. Also note, that any function that uses iteration will also exhaust the messages. So both:: for msg in msgs: print msg as well as:: number_of_msgs = len(msgs) will "exhaust" the Messages. If you need to re-iterate over a list of messages you will need to retrieve a new :class:`Messages` object. Things are not as bad as it seems though, you can store and reuse the single Message objects as often as you want as long as you keep the parent Messages object around. (Recall that due to hierarchical memory allocation, all derived Message objects will be invalid when we delete the parent Messages() object, even if it was already "exhausted".) So this works:: db = Database() msgs = Query(db,'').search_messages() #get a Messages() object msglist = [] for m in msgs: msglist.append(m) # msgs is "exhausted" now and even len(msgs) will raise an exception. # However it will be kept around until all retrieved Message() objects are # also deleted. If you did e.g. an explicit del(msgs) here, the # following lines would fail. # You can reiterate over *msglist* however as often as you want. # It is simply a list with Message objects. print (msglist[0].get_filename()) print (msglist[1].get_filename()) print (msglist[0].get_message_id()) """ #notmuch_tags_get _get = nmlib.notmuch_messages_get _get.restype = c_void_p _collect_tags = nmlib.notmuch_messages_collect_tags _collect_tags.restype = c_void_p def __init__(self, msgs_p, parent=None): """ :param msgs_p: A pointer to an underlying *notmuch_messages_t* structure. These are not publically exposed, so a user will almost never instantiate a :class:`Messages` object herself. They are usually handed back as a result, e.g. in :meth:`Query.search_messages`. *msgs_p* must be valid, we will raise an :exc:`NotmuchError` (STATUS.NULL_POINTER) if it is `None`. :type msgs_p: :class:`ctypes.c_void_p` :param parent: The parent object (ie :class:`Query`) these tags are derived from. It saves a reference to it, so we can automatically delete the db object once all derived objects are dead. :TODO: Make the iterator work more than once and cache the tags in the Python object.(?) """ if msgs_p is None: NotmuchError(STATUS.NULL_POINTER) self._msgs = msgs_p #store parent, so we keep them alive as long as self is alive self._parent = parent def collect_tags(self): """Return the unique :class:`Tags` in the contained messages :returns: :class:`Tags` :exceptions: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if not inited .. note:: :meth:`collect_tags` will iterate over the messages and therefore will not allow further iterations. """ if self._msgs is None: raise NotmuchError(STATUS.NOT_INITIALIZED) # collect all tags (returns NULL on error) tags_p = Messages._collect_tags (self._msgs) #reset _msgs as we iterated over it and can do so only once self._msgs = None if tags_p == None: raise NotmuchError(STATUS.NULL_POINTER) return Tags(tags_p, self) def __iter__(self): """ Make Messages an iterator """ return self def next(self): if self._msgs is None: raise NotmuchError(STATUS.NOT_INITIALIZED) if not nmlib.notmuch_messages_valid(self._msgs): self._msgs = None raise StopIteration msg = Message(Messages._get (self._msgs), self) nmlib.notmuch_messages_move_to_next(self._msgs) return msg def __len__(self): """len(:class:`Messages`) returns the number of contained messages .. note:: As this iterates over the messages, we will not be able to iterate over them again! So this will fail:: #THIS FAILS msgs = Database().create_query('').search_message() if len(msgs) > 0: #this 'exhausts' msgs # next line raises NotmuchError(STATUS.NOT_INITIALIZED)!!! for msg in msgs: print msg Most of the time, using the :meth:`Query.count_messages` is therefore more appropriate (and much faster). While not guaranteeing that it will return the exact same number than len(), in my tests it effectively always did so. """ if self._msgs is None: raise NotmuchError(STATUS.NOT_INITIALIZED) i=0 while nmlib.notmuch_messages_valid(self._msgs): nmlib.notmuch_messages_move_to_next(self._msgs) i += 1 self._msgs = None return i def __del__(self): """Close and free the notmuch Messages""" if self._msgs is not None: nmlib.notmuch_messages_destroy (self._msgs) #------------------------------------------------------------------------------ class Message(object): """Represents a single Email message Technically, this wraps the underlying *notmuch_message_t* structure. """ """notmuch_message_get_filename (notmuch_message_t *message)""" _get_filename = nmlib.notmuch_message_get_filename _get_filename.restype = c_char_p """notmuch_message_get_message_id (notmuch_message_t *message)""" _get_message_id = nmlib.notmuch_message_get_message_id _get_message_id.restype = c_char_p """notmuch_message_get_thread_id""" _get_thread_id = nmlib.notmuch_message_get_thread_id _get_thread_id.restype = c_char_p """notmuch_message_get_replies""" _get_replies = nmlib.notmuch_message_get_replies _get_replies.restype = c_void_p """notmuch_message_get_tags (notmuch_message_t *message)""" _get_tags = nmlib.notmuch_message_get_tags _get_tags.restype = c_void_p _get_date = nmlib.notmuch_message_get_date _get_date.restype = c_int64 _get_header = nmlib.notmuch_message_get_header _get_header.restype = c_char_p def __init__(self, msg_p, parent=None): """ :param msg_p: A pointer to an internal notmuch_message_t Structure. If it is `None`, we will raise an :exc:`NotmuchError` STATUS.NULL_POINTER. :param parent: A 'parent' object is passed which this message is derived from. We save a reference to it, so we can automatically delete the parent object once all derived objects are dead. """ if msg_p is None: NotmuchError(STATUS.NULL_POINTER) self._msg = msg_p #keep reference to parent, so we keep it alive self._parent = parent def get_message_id(self): """Returns the message ID :returns: String with a message ID :exception: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if the message is not initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) return Message._get_message_id(self._msg) def get_thread_id(self): """Returns the thread ID The returned string belongs to 'message' will only be valid for as long as the message is valid. This function will not return None since Notmuch ensures that every message belongs to a single thread. :returns: String with a thread ID :exception: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if the message is not initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) return Message._get_thread_id (self._msg); def get_replies(self): """Gets all direct replies to this message as :class:`Messages` iterator .. note:: This call only makes sense if 'message' was ultimately obtained from a :class:`Thread` object, (such as by coming directly from the result of calling :meth:`Thread.get_toplevel_messages` or by any number of subsequent calls to :meth:`get_replies`). If this message was obtained through some non-thread means, (such as by a call to :meth:`Query.search_messages`), then this function will return `None`. :returns: :class:`Messages` or `None` if there are no replies to this message. :exception: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if the message is not initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) msgs_p = Message._get_replies(self._msg); if msgs_p is None: return None return Messages(msgs_p,self) def get_date(self): """Returns time_t of the message date For the original textual representation of the Date header from the message call notmuch_message_get_header() with a header value of "date". :returns: A time_t timestamp. :rtype: c_unit64 :exception: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if the message is not initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) return Message._get_date(self._msg) def get_header(self, header): """Returns a message header This returns any message header that is stored in the notmuch database. This is only a selected subset of headers, which is currently: TODO: add stored headers :param header: The name of the header to be retrieved. It is not case-sensitive (TODO: confirm). :type header: str :returns: The header value as string :exception: :exc:`NotmuchError` * STATUS.NOT_INITIALIZED if the message is not initialized. * STATUS.NULL_POINTER, if no header was found """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) #Returns NULL if any error occurs. header = Message._get_header (self._msg, header) if header == None: raise NotmuchError(STATUS.NULL_POINTER) return header def get_filename(self): """Returns the file path of the message file :returns: Absolute file path & name of the message file :exception: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if the message is not initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) return Message._get_filename(self._msg) def get_tags(self): """Returns the message tags :returns: A :class:`Tags` iterator. :exception: :exc:`NotmuchError` * STATUS.NOT_INITIALIZED if the message is not initialized. * STATUS.NULL_POINTER, on error """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) tags_p = Message._get_tags(self._msg) if tags_p == None: raise NotmuchError(STATUS.NULL_POINTER) return Tags(tags_p, self) def add_tag(self, tag): """Adds a tag to the given message Adds a tag to the current message. The maximal tag length is defined in the notmuch library and is currently 200 bytes. :param tag: String with a 'tag' to be added. :returns: STATUS.SUCCESS if the tag was successfully added. Raises an exception otherwise. :exception: :exc:`NotmuchError`. They have the following meaning: STATUS.NULL_POINTER The 'tag' argument is NULL STATUS.TAG_TOO_LONG The length of 'tag' is too long (exceeds Message.NOTMUCH_TAG_MAX) STATUS.READ_ONLY_DATABASE Database was opened in read-only mode so message cannot be modified. STATUS.NOT_INITIALIZED The message has not been initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) status = nmlib.notmuch_message_add_tag (self._msg, tag) if STATUS.SUCCESS == status: # return on success return status raise NotmuchError(status) def remove_tag(self, tag): """Removes a tag from the given message If the message has no such tag, this is a non-operation and will report success anyway. :param tag: String with a 'tag' to be removed. :returns: STATUS.SUCCESS if the tag was successfully removed or if the message had no such tag. Raises an exception otherwise. :exception: :exc:`NotmuchError`. They have the following meaning: STATUS.NULL_POINTER The 'tag' argument is NULL STATUS.TAG_TOO_LONG The length of 'tag' is too long (exceeds NOTMUCH_TAG_MAX) STATUS.READ_ONLY_DATABASE Database was opened in read-only mode so message cannot be modified. STATUS.NOT_INITIALIZED The message has not been initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) status = nmlib.notmuch_message_remove_tag(self._msg, tag) if STATUS.SUCCESS == status: # return on success return status raise NotmuchError(status) def remove_all_tags(self): """Removes all tags from the given message. See :meth:`freeze` for an example showing how to safely replace tag values. :returns: STATUS.SUCCESS if the tags were successfully removed. Raises an exception otherwise. :exception: :exc:`NotmuchError`. They have the following meaning: STATUS.READ_ONLY_DATABASE Database was opened in read-only mode so message cannot be modified. STATUS.NOT_INITIALIZED The message has not been initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) status = nmlib.notmuch_message_remove_all_tags(self._msg) if STATUS.SUCCESS == status: # return on success return status raise NotmuchError(status) def freeze(self): """Freezes the current state of 'message' within the database This means that changes to the message state, (via :meth:`add_tag`, :meth:`remove_tag`, and :meth:`remove_all_tags`), will not be committed to the database until the message is :meth:`thaw`ed. Multiple calls to freeze/thaw are valid and these calls will "stack". That is there must be as many calls to thaw as to freeze before a message is actually thawed. The ability to do freeze/thaw allows for safe transactions to change tag values. For example, explicitly setting a message to have a given set of tags might look like this:: msg.freeze() msg.remove_all_tags() for tag in new_tags: msg.add_tag(tag) msg.thaw() With freeze/thaw used like this, the message in the database is guaranteed to have either the full set of original tag values, or the full set of new tag values, but nothing in between. Imagine the example above without freeze/thaw and the operation somehow getting interrupted. This could result in the message being left with no tags if the interruption happened after :meth:`remove_all_tags` but before :meth:`add_tag`. :returns: STATUS.SUCCESS if the message was successfully frozen. Raises an exception otherwise. :exception: :exc:`NotmuchError`. They have the following meaning: STATUS.READ_ONLY_DATABASE Database was opened in read-only mode so message cannot be modified. STATUS.NOT_INITIALIZED The message has not been initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) status = nmlib.notmuch_message_freeze(self._msg) if STATUS.SUCCESS == status: # return on success return status raise NotmuchError(status) def thaw(self): """Thaws the current 'message' Thaw the current 'message', synchronizing any changes that may have occurred while 'message' was frozen into the notmuch database. See :meth:`freeze` for an example of how to use this function to safely provide tag changes. Multiple calls to freeze/thaw are valid and these calls with "stack". That is there must be as many calls to thaw as to freeze before a message is actually thawed. :returns: STATUS.SUCCESS if the message was successfully frozen. Raises an exception otherwise. :exception: :exc:`NotmuchError`. They have the following meaning: STATUS.UNBALANCED_FREEZE_THAW An attempt was made to thaw an unfrozen message. That is, there have been an unbalanced number of calls to :meth:`freeze` and :meth:`thaw`. STATUS.NOT_INITIALIZED The message has not been initialized. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) status = nmlib.notmuch_message_thaw(self._msg) if STATUS.SUCCESS == status: # return on success return status raise NotmuchError(status) def __str__(self): """A message() is represented by a 1-line summary""" msg = {} msg['from'] = self.get_header('from') msg['tags'] = str(self.get_tags()) msg['date'] = date.fromtimestamp(self.get_date()) replies = self.get_replies() msg['replies'] = len(replies) if replies is not None else -1 return "%(from)s (%(date)s) (%(tags)s) (%(replies)d) replies" % (msg) def format_as_text(self): """Output like notmuch show (Not implemented)""" return str(self) def __del__(self): """Close and free the notmuch Message""" if self._msg is not None: nmlib.notmuch_message_destroy (self._msg)