Messages – A bunch of messages¶
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
NotInitializedError. If you need to re-iterate over a list of messages you will need to retrieve a new
Messagesobject or cache your
Messages in a list via:
msglist = list(msgs)
You can store and reuse the single
Messageobjects as often as you want as long as you keep the parent
Messagesobject around. (Due to hierarchical memory allocation, all derived
Messageobjects will be invalid when we delete the parent
Messagesobject, even if it was already exhausted.) So this works:
db = Database() msgs = Query(db,'').search_messages() #get a Messages() object msglist = list(msgs) # msgs is "exhausted" now and msgs.next() will raise an exception. # However it will be kept alive until all retrieved Message() # objects are also deleted. If you do 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 :class:`Message`s. print (msglist.get_filename()) print (msglist.get_filename()) print (msglist.get_message_id())
Messageimplements both __hash__() and __cmp__(), it is possible to make sets out of
Messagesand use set arithmetic (this happens in python and will of course be much slower than redoing a proper query with the appropriate filters:
s1, s2 = set(msgs1), set(msgs2) s.union(s2) s1 -= s2 ...
Be careful when using set arithmetic between message sets derived from different Databases (ie the same database reopened after messages have changed). If messages have added or removed associated files in the meantime, it is possible that the same message would be considered as a different object (as it points to a different file).
- msgs_p (
ctypes.c_void_p) – A pointer to an underlying notmuch_messages_t structure. These are not publicly exposed, so a user will almost never instantiate a
Messagesobject herself. They are usually handed back as a result, e.g. in
Query.search_messages(). msgs_p must be valid, we will raise an
NullPointerErrorif it is None.
- parent – The parent object
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.
Make the iterator work more than once and cache the tags in the Python object.(?)
Return the unique
Tagsin the contained messages
NotInitializedErrorif not init’ed
collect_tags()will iterate over the messages and therefore will not allow further iterations.
- msgs_p (