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notmuch/cnotmuch/message.py
Jesse Rosenthal 3c8ba0f18f message.py: fix indentation
2010-03-30 11:00:27 +02:00

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# This file is part of cnotmuch.
#
# cnotmuch 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.
#
# cnotmuch 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 cnotmuch. If not, see <http://www.gnu.org/licenses/>.
#
# (C) Copyright 2010 Sebastian Spaeth <Sebastian@SSpaeth.de>
# Jesse Rosenthal <jrosenthal@jhu.edu>
from ctypes import c_char_p, c_void_p, c_long, c_bool
from datetime import date
from cnotmuch.globals import nmlib, STATUS, NotmuchError, Enum
from cnotmuch.tag import Tags
import sys
import email
import types
try:
import simplejson as json
except ImportError:
import json
#------------------------------------------------------------------------------
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)
def print_messages(self, format, indent=0, entire_thread=False):
"""Outputs messages as needed for 'notmuch show' to sys.stdout
:param format: A string of either 'text' or 'json'.
:param indent: A number indicating the reply depth of these messages.
:param entire_thread: A bool, indicating whether we want to output
whole threads or only the matching messages.
"""
if format.lower() == "text":
set_start = ""
set_end = ""
set_sep = ""
elif format.lower() == "json":
set_start = "["
set_end = "]"
set_sep = ", "
else:
raise Exception
first_set = True
sys.stdout.write(set_start)
# iterate through all toplevel messages in this thread
for msg in self:
# if not msg:
# break
if not first_set:
sys.stdout.write(set_sep)
first_set = False
sys.stdout.write(set_start)
match = msg.is_match()
next_indent = indent
if (match or entire_thread):
if format.lower() == "text":
sys.stdout.write(msg.format_message_as_text(indent))
elif format.lower() == "json":
sys.stdout.write(msg.format_message_as_json(indent))
else:
raise NotmuchError
next_indent = indent + 1
# get replies and print them also out (if there are any)
replies = msg.get_replies()
if not replies is None:
sys.stdout.write(set_sep)
replies.print_messages(format, next_indent, entire_thread)
sys.stdout.write(set_end)
sys.stdout.write(set_end)
#------------------------------------------------------------------------------
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_flag"""
_get_flag = nmlib.notmuch_message_get_flag
_get_flag.restype = c_bool
"""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_long
_get_header = nmlib.notmuch_message_get_header
_get_header.restype = c_char_p
#Constants: Flags that can be set/get with set_flag
FLAG = Enum(['MATCH'])
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_flag(self, flag):
"""Checks whether a specific flag is set for this message
The method :meth:`Query.search_threads` sets
*Message.FLAG.MATCH* for those messages that match the
query. This method allows us to get the value of this flag.
:param flag: One of the :attr:`Message.FLAG` values (currently only
*Message.FLAG.MATCH*
:returns: A bool, indicating whether the flag is set.
: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_flag(self._msg, flag)
def set_flag(self, flag, value):
"""Sets/Unsets a specific flag for this message
:param flag: One of the :attr:`Message.FLAG` values (currently only
*Message.FLAG.MATCH*
:param value: A bool indicating whether to set or unset the flag.
:returns: Nothing
:exception: :exc:`NotmuchError` STATUS.NOT_INITIALIZED if the message
is not initialized.
"""
if self._msg is None:
raise NotmuchError(STATUS.NOT_INITIALIZED)
nmlib.notmuch_message_set_flag(self._msg, flag, value)
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 is_match(self):
"""(Not implemented)"""
return self.get_flag(Message.FLAG.MATCH)
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 get_message_parts(self):
"""Output like notmuch show"""
fp = open(self.get_filename())
email_msg = email.message_from_file(fp)
fp.close()
out = []
for msg in email_msg.walk():
if not msg.is_multipart():
out.append(msg)
return out
def get_part(self, num):
"""Returns the nth message body part"""
parts = self.get_message_parts()
if (num <= 0 or num > len(parts)):
return ""
else:
out_part = parts[(num - 1)]
return out_part.get_payload(decode=True)
def format_message_internal(self):
"""Create an internal representation of the message parts,
which can easily be output to json, text, or another output
format. The argument match tells whether this matched a
query."""
output = {}
output["id"] = self.get_message_id()
output["match"] = self.is_match()
output["filename"] = self.get_filename()
output["tags"] = list(self.get_tags())
headers = {}
for h in ["Subject", "From", "To", "Cc", "Bcc", "Date"]:
headers[h] = self.get_header(h)
output["headers"] = headers
body = []
parts = self.get_message_parts()
for i in xrange(len(parts)):
msg = parts[i]
part_dict = {}
part_dict["id"] = i + 1
# We'll be using this is a lot, so let's just get it once.
cont_type = msg.get_content_type()
part_dict["content-type"] = cont_type
# NOTE:
# Now we emulate the current behaviour, where it ignores
# the html if there's a text representation.
#
# This is being worked on, but it will be easier to fix
# here in the future than to end up with another
# incompatible solution.
disposition = msg["Content-Disposition"]
if disposition and disposition.lower().startswith("attachment"):
part_dict["filename"] = msg.get_filename()
else:
if cont_type.lower() == "text/plain":
part_dict["content"] = msg.get_payload()
elif (cont_type.lower() == "text/html" and
i == 0):
part_dict["content"] = msg.get_payload()
body.append(part_dict)
output["body"] = body
return output
def format_message_as_json(self, indent=0):
"""Outputs the message as json. This is essentially the same
as python's dict format, but we run it through, just so we
don't have to worry about the details."""
return json.dumps(self.format_message_internal())
def format_message_as_text(self, indent=0):
"""Outputs it in the old-fashioned notmuch text form. Will be
easy to change to a new format when the format changes."""
format = self.format_message_internal()
output = "\fmessage{ id:%s depth:%d match:%d filename:%s" \
% (format['id'], indent, format['match'], format['filename'])
output += "\n\fheader{"
#Todo: this date is supposed to be prettified, as in the index.
output += "\n%s (%s) (" % (format["headers"]["From"],
format["headers"]["Date"])
output += ", ".join(format["tags"])
output += ")"
output += "\nSubject: %s" % format["headers"]["Subject"]
output += "\nFrom: %s" % format["headers"]["From"]
output += "\nTo: %s" % format["headers"]["To"]
if format["headers"]["Cc"]:
output += "\nCc: %s" % format["headers"]["Cc"]
if format["headers"]["Bcc"]:
output += "\nBcc: %s" % format["headers"]["Bcc"]
output += "\nDate: %s" % format["headers"]["Date"]
output += "\n\fheader}"
output += "\n\fbody{"
parts = format["body"]
parts.sort(key=lambda(p): p["id"])
for p in parts:
if not p.has_key("filename"):
output += "\n\fpart{ "
output += "ID: %d, Content-type: %s\n" % (p["id"],
p["content-type"])
if p.has_key("content"):
output += "\n%s\n" % p["content"]
else:
output += "Non-text part: %s\n" % p["content-type"]
output += "\n\fpart}"
else:
output += "\n\fattachment{ "
output += "ID: %d, Content-type:%s\n" % (p["id"],
p["content-type"])
output += "Attachment: %s\n" % p["filename"]
output += "\n\fattachment}\n"
output += "\n\fbody}\n"
output += "\n\fmessage}"
return output
def __del__(self):
"""Close and free the notmuch Message"""
if self._msg is not None:
nmlib.notmuch_message_destroy (self._msg)
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