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docs: doc improvements

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Sebastian Spaeth 2010-03-17 15:14:44 +01:00
parent 61bef71a12
commit d2b4307851
3 changed files with 223 additions and 67 deletions
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253
cnotmuch/database.py
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@ -48,10 +48,10 @@ class Database(object):
:param path: Directory to open/create the database in (see :param path: Directory to open/create the database in (see
above for behavior if `None`) above for behavior if `None`)
:type path: `str` or `None` :type path: `str` or `None`
:param create: False to open an existing, True to create a new :param create: Pass `False` to open an existing, `True` to create a new
database. database.
:type create: bool :type create: bool
:param mode: Mode to open a database in. Always :param mode: Mode to open a database in. Is always
:attr:`MODE`.READ_WRITE when creating a new one. :attr:`MODE`.READ_WRITE when creating a new one.
:type mode: :attr:`MODE` :type mode: :attr:`MODE`
:returns: Nothing :returns: Nothing
@ -73,7 +73,7 @@ class Database(object):
def create(self, path): def create(self, path):
"""Creates a new notmuch database """Creates a new notmuch database
This function is used by __init__() usually does not need This function is used by __init__() and usually does not need
to be called directly. It wraps the underlying to be called directly. It wraps the underlying
*notmuch_database_create* function and creates a new notmuch *notmuch_database_create* function and creates a new notmuch
database at *path*. It will always return a database in database at *path*. It will always return a database in
@ -100,14 +100,14 @@ class Database(object):
def open(self, path, mode= MODE.READ_ONLY): def open(self, path, mode= MODE.READ_ONLY):
"""Opens an existing database """Opens an existing database
This function is used by __init__() usually does not need This function is used by __init__() and usually does not need
to be called directly. It wraps the underlying to be called directly. It wraps the underlying
*notmuch_database_open* function. *notmuch_database_open* function.
:param status: Open the database in read-only or read-write mode :param status: Open the database in read-only or read-write mode
:type status: :attr:`MODE` :type status: :attr:`MODE`
:returns: Nothing :returns: Nothing
:exception: Raises :exc:`notmuch.NotmuchError` in case :exception: Raises :exc:`NotmuchError` in case
of any failure (after printing an error message on stderr). of any failure (after printing an error message on stderr).
""" """
@ -127,9 +127,9 @@ class Database(object):
def find_message(self, msgid): def find_message(self, msgid):
"""Returns a :class:`Message` as identified by its message ID """Returns a :class:`Message` as identified by its message ID
wraps *notmuch_database_find_message* Wraps the underlying *notmuch_database_find_message* function.
:param msgid: The message id :param msgid: The message ID
:type msgid: string :type msgid: string
:returns: :class:`Message` or `None` if no message is found or if an :returns: :class:`Message` or `None` if no message is found or if an
out-of-memory situation occurs. out-of-memory situation occurs.
@ -146,8 +146,8 @@ class Database(object):
def get_all_tags(self): def get_all_tags(self):
"""Returns :class:`Tags` with a list of all tags found in the database """Returns :class:`Tags` with a list of all tags found in the database
:returns: :class:`Tags` object or raises :exc:`NotmuchError` with :returns: :class:`Tags`
STATUS.NULL_POINTER on error :execption: :exc:`NotmuchError` with STATUS.NULL_POINTER on error
""" """
if self._db is None: if self._db is None:
raise NotmuchError(STATUS.NOT_INITIALIZED) raise NotmuchError(STATUS.NOT_INITIALIZED)
@ -188,15 +188,22 @@ class Database(object):
#------------------------------------------------------------------------------ #------------------------------------------------------------------------------
class Query(object): class Query(object):
""" Wrapper around a notmuch_query_t """ Represents a search query on an opened :class:`Database`.
Do note that as soon as we tear down this object, all derived A query selects and filters a subset of messages from the notmuch
threads, and messages will be freed as well. database we derive from.
Technically, it wraps the underlying *notmuch_query_t* struct.
.. note:: Do remember that as soon as we tear down this object,
all underlying derived objects such as queries, threads,
messages, tags etc will be freed by the underlying library
as well. Accessing these objects will lead to segfaults and
other unexpected behavior. See above for more details.
""" """
# constants # constants
SORT_OLDEST_FIRST = 0 SORT = Enum(['OLDEST_FIRST','NEWEST_FIRST','MESSAGE_ID'])
SORT_NEWEST_FIRST = 1 """Constants: Sort order in which to return results"""
SORT_MESSAGE_ID = 2
"""notmuch_query_create""" """notmuch_query_create"""
_create = nmlib.notmuch_query_create _create = nmlib.notmuch_query_create
@ -207,16 +214,32 @@ class Query(object):
_search_messages.restype = c_void_p _search_messages.restype = c_void_p
def __init__(self, db, querystr): def __init__(self, db, querystr):
"""TODO: document""" """
:param db: An open database which we derive the Query from.
:type db: :class:`Database`
:param querystr: The query string for the message.
:type querystr: str
"""
self._db = None self._db = None
self._query = None self._query = None
self.create(db, querystr) self.create(db, querystr)
def create(self, db, querystr): def create(self, db, querystr):
"""db is a Database() and querystr a string """Creates a new query derived from a Database.
raises NotmuchError STATUS.NOT_INITIALIZED if db is not inited and This function is utilized by __init__() and usually does not need to
STATUS.NULL_POINTER if the query creation failed (too little memory) be called directly.
:param db: Database to create the query from.
:type db: :class:`Database`
:param querystr: The query string
:type querystr: str
:returns: Nothing
:exception: :exc:`NotmuchError`
* STATUS.NOT_INITIALIZED if db is not inited
* STATUS.NULL_POINTER if the query creation failed
(too little memory)
""" """
if db.db_p is None: if db.db_p is None:
raise NotmuchError(STATUS.NOT_INITIALIZED) raise NotmuchError(STATUS.NOT_INITIALIZED)
@ -230,10 +253,14 @@ class Query(object):
self._query = query_p self._query = query_p
def set_sort(self, sort): def set_sort(self, sort):
"""notmuch_query_set_sort """Set the sort order future results will be delivered in
:param sort: one of Query.SORT_OLDEST_FIRST|SORT_NEWEST_FIRST|SORT_MESSAGE_ID Wraps the underlying *notmuch_query_set_sort* function.
:returns: Nothing, but raises NotmuchError if query is not inited
:param sort: Sort order (see :attr:`Query.SORT`)
:returns: Nothing
:exception: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if query has not
been initialized.
""" """
if self._query is None: if self._query is None:
raise NotmuchError(STATUS.NOT_INITIALIZED) raise NotmuchError(STATUS.NOT_INITIALIZED)
@ -241,8 +268,17 @@ class Query(object):
nmlib.notmuch_query_set_sort(self._query, sort) nmlib.notmuch_query_set_sort(self._query, sort)
def search_messages(self): def search_messages(self):
"""notmuch_query_search_messages """Filter messages according to query and return
Returns Messages() or a raises a NotmuchError() :class:`Messages` in the defined sort order.
Technically, it wraps the underlying
*notmuch_query_search_messages* function.
:returns: :class:`Messages`
:exception: :exc:`NotmuchError`
* STATUS.NOT_INITIALIZED if query is not inited
* STATUS.NULL_POINTER if search_messages failed
""" """
if self._query is None: if self._query is None:
raise NotmuchError(STATUS.NOT_INITIALIZED) raise NotmuchError(STATUS.NOT_INITIALIZED)
@ -263,7 +299,30 @@ class Query(object):
#------------------------------------------------------------------------------ #------------------------------------------------------------------------------
class Tags(object): class Tags(object):
"""Wrapper around notmuch_tags_t""" """Represents a list of notmuch tags
This object provides an iterator over a list of notmuch tags. 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 tags, and a subsequent
iteration attempt will raise a :exc:`NotmuchError`
STATUS.NOT_INITIALIZED. Also note, that any function that uses
iteration (nearly all) will also exhaust the tags. So both::
for tag in tags: print tag
as well as::
number_of_tags = len(tags)
and even a simple::
#str() iterates over all tags to construct a space separated list
print(str(tags))
will "exhaust" the Tags. If you need to re-iterate over a list of
tags you will need to retrieve a new :class:`Tags` object.
"""
#notmuch_tags_get #notmuch_tags_get
_get = nmlib.notmuch_tags_get _get = nmlib.notmuch_tags_get
@ -271,18 +330,20 @@ class Tags(object):
def __init__(self, tags_p, parent=None): def __init__(self, tags_p, parent=None):
""" """
msg_p is a pointer to an notmuch_message_t Structure. If it is None, :param tags_p: A pointer to an underlying *notmuch_tags_t*
we will raise an NotmuchError(STATUS.NULL_POINTER). structure. These are not publically exposed, so a user
will almost never instantiate a :class:`Tags` object
Is passed the parent these tags are derived from, and saves a herself. They are usually handed back as a result,
reference to it, so we can automatically delete the db object e.g. in :meth:`Database.get_all_tags`. *tags_p* must be
once all derived objects are dead. valid, we will raise an :exc:`NotmuchError`
(STATUS.NULL_POINTER) if it is `None`.
Tags() provides an iterator over all contained tags. However, you will :type tags_p: :class:`ctypes.c_void_p`
only be able to iterate over the Tags once, because the underlying C :param parent: The parent object (ie :class:`Database` or
function only allows iterating once. :class:`Message` these tags are derived from, and saves a
#TODO: make the iterator work more than once and cache the tags in reference to it, so we can automatically delete the db object
the Python object. once all derived objects are dead.
:TODO: Make the iterator optionally work more than once by
cache the tags in the Python object(?)
""" """
if tags_p is None: if tags_p is None:
NotmuchError(STATUS.NULL_POINTER) NotmuchError(STATUS.NULL_POINTER)
@ -308,10 +369,33 @@ class Tags(object):
nmlib.notmuch_tags_move_to_next(self._tags) nmlib.notmuch_tags_move_to_next(self._tags)
return tag return tag
def __str__(self): def __len__(self):
"""str() of Tags() is a space separated list of tags """len(:class:`Tags`) returns the number of contained tags
This iterates over the list of Tags and will therefore 'exhaust' Tags() .. note:: As this iterates over the tags, we will not be able
to iterate over them again (as in retrieve them)! If
the tags have been exhausted already, this will raise a
:exc:`NotmuchError` STATUS.NOT_INITIALIZED on
subsequent attempts.
"""
if self._tags is None:
raise NotmuchError(STATUS.NOT_INITIALIZED)
i=0
while nmlib.notmuch_tags_valid(self._msgs):
nmlib.notmuch_tags_move_to_next(self._msgs)
i += 1
self._tags = None
return i
def __str__(self):
"""The str() representation of Tags() is a space separated list of tags
.. note:: As this iterates over the tags, we will not be able
to iterate over them again (as in retrieve them)! If
the tags have been exhausted already, this will raise a
:exc:`NotmuchError` STATUS.NOT_INITIALIZED on
subsequent attempts.
""" """
return " ".join(self) return " ".join(self)
@ -324,7 +408,52 @@ class Tags(object):
#------------------------------------------------------------------------------ #------------------------------------------------------------------------------
class Messages(object): class Messages(object):
"""Wrapper around notmuch_messages_t""" """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 #notmuch_tags_get
_get = nmlib.notmuch_messages_get _get = nmlib.notmuch_messages_get
@ -335,18 +464,20 @@ class Messages(object):
def __init__(self, msgs_p, parent=None): def __init__(self, msgs_p, parent=None):
""" """
msg_p is a pointer to an notmuch_messages_t Structure. If it is None, :param msgs_p: A pointer to an underlying *notmuch_messages_t*
we will raise an NotmuchError(STATUS.NULL_POINTER). structure. These are not publically exposed, so a user
will almost never instantiate a :class:`Messages` object
If passed the parent query this Messages() is derived from, it saves a herself. They are usually handed back as a result,
reference to it, so we can automatically delete the parent query object e.g. in :meth:`Query.search_messages`. *msgs_p* must be
once all derived objects are dead. valid, we will raise an :exc:`NotmuchError`
(STATUS.NULL_POINTER) if it is `None`.
Messages() provides an iterator over all contained Message()s. :type msgs_p: :class:`ctypes.c_void_p`
However, you will only be able to iterate over it once, :param parent: The parent object
because the underlying C function only allows iterating once. (ie :class:`Query`) these tags are derived from. It saves
#TODO: make the iterator work more than once and cache the tags in a reference to it, so we can automatically delete the db
the Python object. 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: if msgs_p is None:
NotmuchError(STATUS.NULL_POINTER) NotmuchError(STATUS.NULL_POINTER)
@ -357,11 +488,13 @@ class Messages(object):
logging.debug("Inited Messages derived from %s" %(str(parent))) logging.debug("Inited Messages derived from %s" %(str(parent)))
def collect_tags(self): def collect_tags(self):
""" return the Tags() belonging to the messages """Return the unique :class:`Tags` in the contained messages
Do note that collect_tags will iterate over the messages and :returns: :class:`Tags`
therefore will not allow further iterationsl :exceptions: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if not inited
Raises 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: if self._msgs is None:
raise NotmuchError(STATUS.NOT_INITIALIZED) raise NotmuchError(STATUS.NOT_INITIALIZED)
@ -392,9 +525,9 @@ class Messages(object):
return msg return msg
def __len__(self): def __len__(self):
""" Returns the number of contained messages """len(:class:`Messages`) returns the number of contained messages
:note: As this iterates over the messages, we will not be able to .. note:: As this iterates over the messages, we will not be able to
iterate over them again (as in retrieve them)! iterate over them again (as in retrieve them)!
""" """
if self._msgs is None: if self._msgs is None:

2
cnotmuch/notmuch.py
View file

@ -1,5 +1,7 @@
"""The :mod:`notmuch` module provides most of the functionality that a user is likely to need. """The :mod:`notmuch` module provides most of the functionality that a user is likely to need.
Many of its objects use python's logging module to log some output at DEBUG level.
.. note:: The underlying notmuch library is build on a hierarchical .. note:: The underlying notmuch library is build on a hierarchical
memory allocator called talloc. All objects derive from a memory allocator called talloc. All objects derive from a
top-level :class:`Database` object. top-level :class:`Database` object.

35
docs/source/index.rst
View file

@ -62,17 +62,38 @@ or::
.. autoattribute:: db_p .. autoattribute:: db_p
:class:`Query` -- Represents a notmuch Query :class:`Query` -- A search query
----------------------------------------------- -----------------------------------------------
.. autoclass:: Query .. autoclass:: Query
:members:
.. automethod:: create
.. attribute:: Query.SORT
Defines constants that are used as the mode in which to open a database.
SORT.OLDEST_FIRST
Sort by message date, oldest first.
SORT.NEWEST_FIRST
Sort by message date, newest first.
SORT.MESSAGE_ID
Sort by email message ID
.. automethod:: set_sort
.. automethod:: search_messages
:class:`Messages` -- A bunch of messages :class:`Messages` -- A bunch of messages
---------------------------------------- ----------------------------------------
.. autoclass:: Messages .. autoclass:: Messages
:members:
.. automethod:: collect_tags
.. automethod:: __len__
:class:`Message` -- A single message :class:`Message` -- A single message
---------------------------------------- ----------------------------------------
@ -80,15 +101,15 @@ or::
.. autoclass:: Message .. autoclass:: Message
:members: :members:
:class:`Tags` -- A bunch of notmuch tags :class:`Tags` -- Notmuch tags
---------------------------------------- -----------------------------
.. autoclass:: Tags .. autoclass:: Tags
:members: :members:
.. data: '__notmuchcmd__' .. automethod:: __len__
This is the actual binary that will be executed in order to run a notmuch command. This is set to *notmuch* and should usually not be changed. .. automethod:: __str__
:exc:`NotmuchError` -- A Notmuch execution error :exc:`NotmuchError` -- A Notmuch execution error
------------------------------------------------ ------------------------------------------------