MCL/sftools/dev/hostenv/pythontoolsplat: comparison python-2.5.2/win32/Lib/mailbox.py

equal deleted inserted replaced

--1:000000000000
+:ae805ac0140d
+#! /usr/bin/env python
+"""Read/write support for Maildir, mbox, MH, Babyl, and MMDF mailboxes."""
+# Notes for authors of new mailbox subclasses:
+#
+# Remember to fsync() changes to disk before closing a modified file
+# or returning from a flush() method.  See functions _sync_flush() and
+# _sync_close().
+import sys
+import os
+import time
+import calendar
+import socket
+import errno
+import copy
+import email
+import email.Message
+import email.Generator
+import rfc822
+import StringIO
+try:
+if sys.platform == 'os2emx':
+# OS/2 EMX fcntl() not adequate
+raise ImportError
+import fcntl
+except ImportError:
+fcntl = None
+__all__ = [ 'Mailbox', 'Maildir', 'mbox', 'MH', 'Babyl', 'MMDF',
+'Message', 'MaildirMessage', 'mboxMessage', 'MHMessage',
+'BabylMessage', 'MMDFMessage', 'UnixMailbox',
+'PortableUnixMailbox', 'MmdfMailbox', 'MHMailbox', 'BabylMailbox' ]
+class Mailbox:
+"""A group of messages in a particular place."""
+def __init__(self, path, factory=None, create=True):
+"""Initialize a Mailbox instance."""
+self._path = os.path.abspath(os.path.expanduser(path))
+self._factory = factory
+def add(self, message):
+"""Add message and return assigned key."""
+raise NotImplementedError('Method must be implemented by subclass')
+def remove(self, key):
+"""Remove the keyed message; raise KeyError if it doesn't exist."""
+raise NotImplementedError('Method must be implemented by subclass')
+def __delitem__(self, key):
+self.remove(key)
+def discard(self, key):
+"""If the keyed message exists, remove it."""
+try:
+self.remove(key)
+except KeyError:
+pass
+def __setitem__(self, key, message):
+"""Replace the keyed message; raise KeyError if it doesn't exist."""
+raise NotImplementedError('Method must be implemented by subclass')
+def get(self, key, default=None):
+"""Return the keyed message, or default if it doesn't exist."""
+try:
+return self.__getitem__(key)
+except KeyError:
+return default
+def __getitem__(self, key):
+"""Return the keyed message; raise KeyError if it doesn't exist."""
+if not self._factory:
+return self.get_message(key)
+else:
+return self._factory(self.get_file(key))
+def get_message(self, key):
+"""Return a Message representation or raise a KeyError."""
+raise NotImplementedError('Method must be implemented by subclass')
+def get_string(self, key):
+"""Return a string representation or raise a KeyError."""
+raise NotImplementedError('Method must be implemented by subclass')
+def get_file(self, key):
+"""Return a file-like representation or raise a KeyError."""
+raise NotImplementedError('Method must be implemented by subclass')
+def iterkeys(self):
+"""Return an iterator over keys."""
+raise NotImplementedError('Method must be implemented by subclass')
+def keys(self):
+"""Return a list of keys."""
+return list(self.iterkeys())
+def itervalues(self):
+"""Return an iterator over all messages."""
+for key in self.iterkeys():
+try:
+value = self[key]
+except KeyError:
+continue
+yield value
+def __iter__(self):
+return self.itervalues()
+def values(self):
+"""Return a list of messages. Memory intensive."""
+return list(self.itervalues())
+def iteritems(self):
+"""Return an iterator over (key, message) tuples."""
+for key in self.iterkeys():
+try:
+value = self[key]
+except KeyError:
+continue
+yield (key, value)
+def items(self):
+"""Return a list of (key, message) tuples. Memory intensive."""
+return list(self.iteritems())
+def has_key(self, key):
+"""Return True if the keyed message exists, False otherwise."""
+raise NotImplementedError('Method must be implemented by subclass')
+def __contains__(self, key):
+return self.has_key(key)
+def __len__(self):
+"""Return a count of messages in the mailbox."""
+raise NotImplementedError('Method must be implemented by subclass')
+def clear(self):
+"""Delete all messages."""
+for key in self.iterkeys():
+self.discard(key)
+def pop(self, key, default=None):
+"""Delete the keyed message and return it, or default."""
+try:
+result = self[key]
+except KeyError:
+return default
+self.discard(key)
+return result
+def popitem(self):
+"""Delete an arbitrary (key, message) pair and return it."""
+for key in self.iterkeys():
+return (key, self.pop(key))     # This is only run once.
+else:
+raise KeyError('No messages in mailbox')
+def update(self, arg=None):
+"""Change the messages that correspond to certain keys."""
+if hasattr(arg, 'iteritems'):
+source = arg.iteritems()
+elif hasattr(arg, 'items'):
+source = arg.items()
+else:
+source = arg
+bad_key = False
+for key, message in source:
+try:
+self[key] = message
+except KeyError:
+bad_key = True
+if bad_key:
+raise KeyError('No message with key(s)')
+def flush(self):
+"""Write any pending changes to the disk."""
+raise NotImplementedError('Method must be implemented by subclass')
+def lock(self):
+"""Lock the mailbox."""
+raise NotImplementedError('Method must be implemented by subclass')
+def unlock(self):
+"""Unlock the mailbox if it is locked."""
+raise NotImplementedError('Method must be implemented by subclass')
+def close(self):
+"""Flush and close the mailbox."""
+raise NotImplementedError('Method must be implemented by subclass')
+def _dump_message(self, message, target, mangle_from_=False):
+# Most files are opened in binary mode to allow predictable seeking.
+# To get native line endings on disk, the user-friendly \n line endings
+# used in strings and by email.Message are translated here.
+"""Dump message contents to target file."""
+if isinstance(message, email.Message.Message):
+buffer = StringIO.StringIO()
+gen = email.Generator.Generator(buffer, mangle_from_, 0)
+gen.flatten(message)
+buffer.seek(0)
+target.write(buffer.read().replace('\n', os.linesep))
+elif isinstance(message, str):
+if mangle_from_:
+message = message.replace('\nFrom ', '\n>From ')
+message = message.replace('\n', os.linesep)
+target.write(message)
+elif hasattr(message, 'read'):
+while True:
+line = message.readline()
+if line == '':
+break
+if mangle_from_ and line.startswith('From '):
+line = '>From ' + line[5:]
+line = line.replace('\n', os.linesep)
+target.write(line)
+else:
+raise TypeError('Invalid message type: %s' % type(message))
+class Maildir(Mailbox):
+"""A qmail-style Maildir mailbox."""
+colon = ':'
+def __init__(self, dirname, factory=rfc822.Message, create=True):
+"""Initialize a Maildir instance."""
+Mailbox.__init__(self, dirname, factory, create)
+if not os.path.exists(self._path):
+if create:
+os.mkdir(self._path, 0700)
+os.mkdir(os.path.join(self._path, 'tmp'), 0700)
+os.mkdir(os.path.join(self._path, 'new'), 0700)
+os.mkdir(os.path.join(self._path, 'cur'), 0700)
+else:
+raise NoSuchMailboxError(self._path)
+self._toc = {}
+def add(self, message):
+"""Add message and return assigned key."""
+tmp_file = self._create_tmp()
+try:
+self._dump_message(message, tmp_file)
+finally:
+_sync_close(tmp_file)
+if isinstance(message, MaildirMessage):
+subdir = message.get_subdir()
+suffix = self.colon + message.get_info()
+if suffix == self.colon:
+suffix = ''
+else:
+subdir = 'new'
+suffix = ''
+uniq = os.path.basename(tmp_file.name).split(self.colon)[0]
+dest = os.path.join(self._path, subdir, uniq + suffix)
+try:
+if hasattr(os, 'link'):
+os.link(tmp_file.name, dest)
+os.remove(tmp_file.name)
+else:
+os.rename(tmp_file.name, dest)
+except OSError, e:
+os.remove(tmp_file.name)
+if e.errno == errno.EEXIST:
+raise ExternalClashError('Name clash with existing message: %s'
+% dest)
+else:
+raise
+if isinstance(message, MaildirMessage):
+os.utime(dest, (os.path.getatime(dest), message.get_date()))
+return uniq
+def remove(self, key):
+"""Remove the keyed message; raise KeyError if it doesn't exist."""
+os.remove(os.path.join(self._path, self._lookup(key)))
+def discard(self, key):
+"""If the keyed message exists, remove it."""
+# This overrides an inapplicable implementation in the superclass.
+try:
+self.remove(key)
+except KeyError:
+pass
+except OSError, e:
+if e.errno != errno.ENOENT:
+raise
+def __setitem__(self, key, message):
+"""Replace the keyed message; raise KeyError if it doesn't exist."""
+old_subpath = self._lookup(key)
+temp_key = self.add(message)
+temp_subpath = self._lookup(temp_key)
+if isinstance(message, MaildirMessage):
+# temp's subdir and suffix were specified by message.
+dominant_subpath = temp_subpath
+else:
+# temp's subdir and suffix were defaults from add().
+dominant_subpath = old_subpath
+subdir = os.path.dirname(dominant_subpath)
+if self.colon in dominant_subpath:
+suffix = self.colon + dominant_subpath.split(self.colon)[-1]
+else:
+suffix = ''
+self.discard(key)
+new_path = os.path.join(self._path, subdir, key + suffix)
+os.rename(os.path.join(self._path, temp_subpath), new_path)
+if isinstance(message, MaildirMessage):
+os.utime(new_path, (os.path.getatime(new_path),
+message.get_date()))
+def get_message(self, key):
+"""Return a Message representation or raise a KeyError."""
+subpath = self._lookup(key)
+f = open(os.path.join(self._path, subpath), 'r')
+try:
+if self._factory:
+msg = self._factory(f)
+else:
+msg = MaildirMessage(f)
+finally:
+f.close()
+subdir, name = os.path.split(subpath)
+msg.set_subdir(subdir)
+if self.colon in name:
+msg.set_info(name.split(self.colon)[-1])
+msg.set_date(os.path.getmtime(os.path.join(self._path, subpath)))
+return msg
+def get_string(self, key):
+"""Return a string representation or raise a KeyError."""
+f = open(os.path.join(self._path, self._lookup(key)), 'r')
+try:
+return f.read()
+finally:
+f.close()
+def get_file(self, key):
+"""Return a file-like representation or raise a KeyError."""
+f = open(os.path.join(self._path, self._lookup(key)), 'rb')
+return _ProxyFile(f)
+def iterkeys(self):
+"""Return an iterator over keys."""
+self._refresh()
+for key in self._toc:
+try:
+self._lookup(key)
+except KeyError:
+continue
+yield key
+def has_key(self, key):
+"""Return True if the keyed message exists, False otherwise."""
+self._refresh()
+return key in self._toc
+def __len__(self):
+"""Return a count of messages in the mailbox."""
+self._refresh()
+return len(self._toc)
+def flush(self):
+"""Write any pending changes to disk."""
+return  # Maildir changes are always written immediately.
+def lock(self):
+"""Lock the mailbox."""
+return
+def unlock(self):
+"""Unlock the mailbox if it is locked."""
+return
+def close(self):
+"""Flush and close the mailbox."""
+return
+def list_folders(self):
+"""Return a list of folder names."""
+result = []
+for entry in os.listdir(self._path):
+if len(entry) > 1 and entry[0] == '.' and \
+os.path.isdir(os.path.join(self._path, entry)):
+result.append(entry[1:])
+return result
+def get_folder(self, folder):
+"""Return a Maildir instance for the named folder."""
+return Maildir(os.path.join(self._path, '.' + folder),
+factory=self._factory,
+create=False)
+def add_folder(self, folder):
+"""Create a folder and return a Maildir instance representing it."""
+path = os.path.join(self._path, '.' + folder)
+result = Maildir(path, factory=self._factory)
+maildirfolder_path = os.path.join(path, 'maildirfolder')
+if not os.path.exists(maildirfolder_path):
+os.close(os.open(maildirfolder_path, os.O_CREAT | os.O_WRONLY))
+return result
+def remove_folder(self, folder):
+"""Delete the named folder, which must be empty."""
+path = os.path.join(self._path, '.' + folder)
+for entry in os.listdir(os.path.join(path, 'new')) + \
+os.listdir(os.path.join(path, 'cur')):
+if len(entry) < 1 or entry[0] != '.':
+raise NotEmptyError('Folder contains message(s): %s' % folder)
+for entry in os.listdir(path):
+if entry != 'new' and entry != 'cur' and entry != 'tmp' and \
+os.path.isdir(os.path.join(path, entry)):
+raise NotEmptyError("Folder contains subdirectory '%s': %s" %
+(folder, entry))
+for root, dirs, files in os.walk(path, topdown=False):
+for entry in files:
+os.remove(os.path.join(root, entry))
+for entry in dirs:
+os.rmdir(os.path.join(root, entry))
+os.rmdir(path)
+def clean(self):
+"""Delete old files in "tmp"."""
+now = time.time()
+for entry in os.listdir(os.path.join(self._path, 'tmp')):
+path = os.path.join(self._path, 'tmp', entry)
+if now - os.path.getatime(path) > 129600:   # 60 * 60 * 36
+os.remove(path)
+_count = 1  # This is used to generate unique file names.
+def _create_tmp(self):
+"""Create a file in the tmp subdirectory and open and return it."""
+now = time.time()
+hostname = socket.gethostname()
+if '/' in hostname:
+hostname = hostname.replace('/', r'\057')
+if ':' in hostname:
+hostname = hostname.replace(':', r'\072')
+uniq = "%s.M%sP%sQ%s.%s" % (int(now), int(now % 1 * 1e6), os.getpid(),
+Maildir._count, hostname)
+path = os.path.join(self._path, 'tmp', uniq)
+try:
+os.stat(path)
+except OSError, e:
+if e.errno == errno.ENOENT:
+Maildir._count += 1
+try:
+return _create_carefully(path)
+except OSError, e:
+if e.errno != errno.EEXIST:
+raise
+else:
+raise
+# Fall through to here if stat succeeded or open raised EEXIST.
+raise ExternalClashError('Name clash prevented file creation: %s' %
+path)
+def _refresh(self):
+"""Update table of contents mapping."""
+self._toc = {}
+for subdir in ('new', 'cur'):
+subdir_path = os.path.join(self._path, subdir)
+for entry in os.listdir(subdir_path):
+p = os.path.join(subdir_path, entry)
+if os.path.isdir(p):
+continue
+uniq = entry.split(self.colon)[0]
+self._toc[uniq] = os.path.join(subdir, entry)
+def _lookup(self, key):
+"""Use TOC to return subpath for given key, or raise a KeyError."""
+try:
+if os.path.exists(os.path.join(self._path, self._toc[key])):
+return self._toc[key]
+except KeyError:
+pass
+self._refresh()
+try:
+return self._toc[key]
+except KeyError:
+raise KeyError('No message with key: %s' % key)
+# This method is for backward compatibility only.
+def next(self):
+"""Return the next message in a one-time iteration."""
+if not hasattr(self, '_onetime_keys'):
+self._onetime_keys = self.iterkeys()
+while True:
+try:
+return self[self._onetime_keys.next()]
+except StopIteration:
+return None
+except KeyError:
+continue
+class _singlefileMailbox(Mailbox):
+"""A single-file mailbox."""
+def __init__(self, path, factory=None, create=True):
+"""Initialize a single-file mailbox."""
+Mailbox.__init__(self, path, factory, create)
+try:
+f = open(self._path, 'rb+')
+except IOError, e:
+if e.errno == errno.ENOENT:
+if create:
+f = open(self._path, 'wb+')
+else:
+raise NoSuchMailboxError(self._path)
+elif e.errno == errno.EACCES:
+f = open(self._path, 'rb')
+else:
+raise
+self._file = f
+self._toc = None
+self._next_key = 0
+self._pending = False   # No changes require rewriting the file.
+self._locked = False
+def add(self, message):
+"""Add message and return assigned key."""
+self._lookup()
+self._toc[self._next_key] = self._append_message(message)
+self._next_key += 1
+self._pending = True
+return self._next_key - 1
+def remove(self, key):
+"""Remove the keyed message; raise KeyError if it doesn't exist."""
+self._lookup(key)
+del self._toc[key]
+self._pending = True
+def __setitem__(self, key, message):
+"""Replace the keyed message; raise KeyError if it doesn't exist."""
+self._lookup(key)
+self._toc[key] = self._append_message(message)
+self._pending = True
+def iterkeys(self):
+"""Return an iterator over keys."""
+self._lookup()
+for key in self._toc.keys():
+yield key
+def has_key(self, key):
+"""Return True if the keyed message exists, False otherwise."""
+self._lookup()
+return key in self._toc
+def __len__(self):
+"""Return a count of messages in the mailbox."""
+self._lookup()
+return len(self._toc)
+def lock(self):
+"""Lock the mailbox."""
+if not self._locked:
+_lock_file(self._file)
+self._locked = True
+def unlock(self):
+"""Unlock the mailbox if it is locked."""
+if self._locked:
+_unlock_file(self._file)
+self._locked = False
+def flush(self):
+"""Write any pending changes to disk."""
+if not self._pending:
+return
+self._lookup()
+new_file = _create_temporary(self._path)
+try:
+new_toc = {}
+self._pre_mailbox_hook(new_file)
+for key in sorted(self._toc.keys()):
+start, stop = self._toc[key]
+self._file.seek(start)
+self._pre_message_hook(new_file)
+new_start = new_file.tell()
+while True:
+buffer = self._file.read(min(4096,
+stop - self._file.tell()))
+if buffer == '':
+break
+new_file.write(buffer)
+new_toc[key] = (new_start, new_file.tell())
+self._post_message_hook(new_file)
+except:
+new_file.close()
+os.remove(new_file.name)
+raise
+_sync_close(new_file)
+# self._file is about to get replaced, so no need to sync.
+self._file.close()
+try:
+os.rename(new_file.name, self._path)
+except OSError, e:
+if e.errno == errno.EEXIST or \
+(os.name == 'os2' and e.errno == errno.EACCES):
+os.remove(self._path)
+os.rename(new_file.name, self._path)
+else:
+raise
+self._file = open(self._path, 'rb+')
+self._toc = new_toc
+self._pending = False
+if self._locked:
+_lock_file(self._file, dotlock=False)
+def _pre_mailbox_hook(self, f):
+"""Called before writing the mailbox to file f."""
+return
+def _pre_message_hook(self, f):
+"""Called before writing each message to file f."""
+return
+def _post_message_hook(self, f):
+"""Called after writing each message to file f."""
+return
+def close(self):
+"""Flush and close the mailbox."""
+self.flush()
+if self._locked:
+self.unlock()
+self._file.close()  # Sync has been done by self.flush() above.
+def _lookup(self, key=None):
+"""Return (start, stop) or raise KeyError."""
+if self._toc is None:
+self._generate_toc()
+if key is not None:
+try:
+return self._toc[key]
+except KeyError:
+raise KeyError('No message with key: %s' % key)
+def _append_message(self, message):
+"""Append message to mailbox and return (start, stop) offsets."""
+self._file.seek(0, 2)
+self._pre_message_hook(self._file)
+offsets = self._install_message(message)
+self._post_message_hook(self._file)
+self._file.flush()
+return offsets
+class _mboxMMDF(_singlefileMailbox):
+"""An mbox or MMDF mailbox."""
+_mangle_from_ = True
+def get_message(self, key):
+"""Return a Message representation or raise a KeyError."""
+start, stop = self._lookup(key)
+self._file.seek(start)
+from_line = self._file.readline().replace(os.linesep, '')
+string = self._file.read(stop - self._file.tell())
+msg = self._message_factory(string.replace(os.linesep, '\n'))
+msg.set_from(from_line[5:])
+return msg
+def get_string(self, key, from_=False):
+"""Return a string representation or raise a KeyError."""
+start, stop = self._lookup(key)
+self._file.seek(start)
+if not from_:
+self._file.readline()
+string = self._file.read(stop - self._file.tell())
+return string.replace(os.linesep, '\n')
+def get_file(self, key, from_=False):
+"""Return a file-like representation or raise a KeyError."""
+start, stop = self._lookup(key)
+self._file.seek(start)
+if not from_:
+self._file.readline()
+return _PartialFile(self._file, self._file.tell(), stop)
+def _install_message(self, message):
+"""Format a message and blindly write to self._file."""
+from_line = None
+if isinstance(message, str) and message.startswith('From '):
+newline = message.find('\n')
+if newline != -1:
+from_line = message[:newline]
+message = message[newline + 1:]
+else:
+from_line = message
+message = ''
+elif isinstance(message, _mboxMMDFMessage):
+from_line = 'From ' + message.get_from()
+elif isinstance(message, email.Message.Message):
+from_line = message.get_unixfrom()  # May be None.
+if from_line is None:
+from_line = 'From MAILER-DAEMON %s' % time.asctime(time.gmtime())
+start = self._file.tell()
+self._file.write(from_line + os.linesep)
+self._dump_message(message, self._file, self._mangle_from_)
+stop = self._file.tell()
+return (start, stop)
+class mbox(_mboxMMDF):
+"""A classic mbox mailbox."""
+_mangle_from_ = True
+def __init__(self, path, factory=None, create=True):
+"""Initialize an mbox mailbox."""
+self._message_factory = mboxMessage
+_mboxMMDF.__init__(self, path, factory, create)
+def _pre_message_hook(self, f):
+"""Called before writing each message to file f."""
+if f.tell() != 0:
+f.write(os.linesep)
+def _generate_toc(self):
+"""Generate key-to-(start, stop) table of contents."""
+starts, stops = [], []
+self._file.seek(0)
+while True:
+line_pos = self._file.tell()
+line = self._file.readline()
+if line.startswith('From '):
+if len(stops) < len(starts):
+stops.append(line_pos - len(os.linesep))
+starts.append(line_pos)
+elif line == '':
+stops.append(line_pos)
+break
+self._toc = dict(enumerate(zip(starts, stops)))
+self._next_key = len(self._toc)
+class MMDF(_mboxMMDF):
+"""An MMDF mailbox."""
+def __init__(self, path, factory=None, create=True):
+"""Initialize an MMDF mailbox."""
+self._message_factory = MMDFMessage
+_mboxMMDF.__init__(self, path, factory, create)
+def _pre_message_hook(self, f):
+"""Called before writing each message to file f."""
+f.write('\001\001\001\001' + os.linesep)
+def _post_message_hook(self, f):
+"""Called after writing each message to file f."""
+f.write(os.linesep + '\001\001\001\001' + os.linesep)
+def _generate_toc(self):
+"""Generate key-to-(start, stop) table of contents."""
+starts, stops = [], []
+self._file.seek(0)
+next_pos = 0
+while True:
+line_pos = next_pos
+line = self._file.readline()
+next_pos = self._file.tell()
+if line.startswith('\001\001\001\001' + os.linesep):
+starts.append(next_pos)
+while True:
+line_pos = next_pos
+line = self._file.readline()
+next_pos = self._file.tell()
+if line == '\001\001\001\001' + os.linesep:
+stops.append(line_pos - len(os.linesep))
+break
+elif line == '':
+stops.append(line_pos)
+break
+elif line == '':
+break
+self._toc = dict(enumerate(zip(starts, stops)))
+self._next_key = len(self._toc)
+class MH(Mailbox):
+"""An MH mailbox."""
+def __init__(self, path, factory=None, create=True):
+"""Initialize an MH instance."""
+Mailbox.__init__(self, path, factory, create)
+if not os.path.exists(self._path):
+if create:
+os.mkdir(self._path, 0700)
+os.close(os.open(os.path.join(self._path, '.mh_sequences'),
+os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0600))
+else:
+raise NoSuchMailboxError(self._path)
+self._locked = False
+def add(self, message):
+"""Add message and return assigned key."""
+keys = self.keys()
+if len(keys) == 0:
+new_key = 1
+else:
+new_key = max(keys) + 1
+new_path = os.path.join(self._path, str(new_key))
+f = _create_carefully(new_path)
+try:
+if self._locked:
+_lock_file(f)
+try:
+self._dump_message(message, f)
+if isinstance(message, MHMessage):
+self._dump_sequences(message, new_key)
+finally:
+if self._locked:
+_unlock_file(f)
+finally:
+_sync_close(f)
+return new_key
+def remove(self, key):
+"""Remove the keyed message; raise KeyError if it doesn't exist."""
+path = os.path.join(self._path, str(key))
+try:
+f = open(path, 'rb+')
+except IOError, e:
+if e.errno == errno.ENOENT:
+raise KeyError('No message with key: %s' % key)
+else:
+raise
+try:
+if self._locked:
+_lock_file(f)
+try:
+f.close()
+os.remove(os.path.join(self._path, str(key)))
+finally:
+if self._locked:
+_unlock_file(f)
+finally:
+f.close()
+def __setitem__(self, key, message):
+"""Replace the keyed message; raise KeyError if it doesn't exist."""
+path = os.path.join(self._path, str(key))
+try:
+f = open(path, 'rb+')
+except IOError, e:
+if e.errno == errno.ENOENT:
+raise KeyError('No message with key: %s' % key)
+else:
+raise
+try:
+if self._locked:
+_lock_file(f)
+try:
+os.close(os.open(path, os.O_WRONLY | os.O_TRUNC))
+self._dump_message(message, f)
+if isinstance(message, MHMessage):
+self._dump_sequences(message, key)
+finally:
+if self._locked:
+_unlock_file(f)
+finally:
+_sync_close(f)
+def get_message(self, key):
+"""Return a Message representation or raise a KeyError."""
+try:
+if self._locked:
+f = open(os.path.join(self._path, str(key)), 'r+')
+else:
+f = open(os.path.join(self._path, str(key)), 'r')
+except IOError, e:
+if e.errno == errno.ENOENT:
+raise KeyError('No message with key: %s' % key)
+else:
+raise
+try:
+if self._locked:
+_lock_file(f)
+try:
+msg = MHMessage(f)
+finally:
+if self._locked:
+_unlock_file(f)
+finally:
+f.close()
+for name, key_list in self.get_sequences():
+if key in key_list:
+msg.add_sequence(name)
+return msg
+def get_string(self, key):
+"""Return a string representation or raise a KeyError."""
+try:
+if self._locked:
+f = open(os.path.join(self._path, str(key)), 'r+')
+else:
+f = open(os.path.join(self._path, str(key)), 'r')
+except IOError, e:
+if e.errno == errno.ENOENT:
+raise KeyError('No message with key: %s' % key)
+else:
+raise
+try:
+if self._locked:
+_lock_file(f)
+try:
+return f.read()
+finally:
+if self._locked:
+_unlock_file(f)
+finally:
+f.close()
+def get_file(self, key):
+"""Return a file-like representation or raise a KeyError."""
+try:
+f = open(os.path.join(self._path, str(key)), 'rb')
+except IOError, e:
+if e.errno == errno.ENOENT:
+raise KeyError('No message with key: %s' % key)
+else:
+raise
+return _ProxyFile(f)
+def iterkeys(self):
+"""Return an iterator over keys."""
+return iter(sorted(int(entry) for entry in os.listdir(self._path)
+if entry.isdigit()))
+def has_key(self, key):
+"""Return True if the keyed message exists, False otherwise."""
+return os.path.exists(os.path.join(self._path, str(key)))
+def __len__(self):
+"""Return a count of messages in the mailbox."""
+return len(list(self.iterkeys()))
+def lock(self):
+"""Lock the mailbox."""
+if not self._locked:
+self._file = open(os.path.join(self._path, '.mh_sequences'), 'rb+')
+_lock_file(self._file)
+self._locked = True
+def unlock(self):
+"""Unlock the mailbox if it is locked."""
+if self._locked:
+_unlock_file(self._file)
+_sync_close(self._file)
+del self._file
+self._locked = False
+def flush(self):
+"""Write any pending changes to the disk."""
+return
+def close(self):
+"""Flush and close the mailbox."""
+if self._locked:
+self.unlock()
+def list_folders(self):
+"""Return a list of folder names."""
+result = []
+for entry in os.listdir(self._path):
+if os.path.isdir(os.path.join(self._path, entry)):
+result.append(entry)
+return result
+def get_folder(self, folder):
+"""Return an MH instance for the named folder."""
+return MH(os.path.join(self._path, folder),
+factory=self._factory, create=False)
+def add_folder(self, folder):
+"""Create a folder and return an MH instance representing it."""
+return MH(os.path.join(self._path, folder),
+factory=self._factory)
+def remove_folder(self, folder):
+"""Delete the named folder, which must be empty."""
+path = os.path.join(self._path, folder)
+entries = os.listdir(path)
+if entries == ['.mh_sequences']:
+os.remove(os.path.join(path, '.mh_sequences'))
+elif entries == []:
+pass
+else:
+raise NotEmptyError('Folder not empty: %s' % self._path)
+os.rmdir(path)
+def get_sequences(self):
+"""Return a name-to-key-list dictionary to define each sequence."""
+results = {}
+f = open(os.path.join(self._path, '.mh_sequences'), 'r')
+try:
+all_keys = set(self.keys())
+for line in f:
+try:
+name, contents = line.split(':')
+keys = set()
+for spec in contents.split():
+if spec.isdigit():
+keys.add(int(spec))
+else:
+start, stop = (int(x) for x in spec.split('-'))
+keys.update(range(start, stop + 1))
+results[name] = [key for key in sorted(keys) \
+if key in all_keys]
+if len(results[name]) == 0:
+del results[name]
+except ValueError:
+raise FormatError('Invalid sequence specification: %s' %
+line.rstrip())
+finally:
+f.close()
+return results
+def set_sequences(self, sequences):
+"""Set sequences using the given name-to-key-list dictionary."""
+f = open(os.path.join(self._path, '.mh_sequences'), 'r+')
+try:
+os.close(os.open(f.name, os.O_WRONLY | os.O_TRUNC))
+for name, keys in sequences.iteritems():
+if len(keys) == 0:
+continue
+f.write('%s:' % name)
+prev = None
+completing = False
+for key in sorted(set(keys)):
+if key - 1 == prev:
+if not completing:
+completing = True
+f.write('-')
+elif completing:
+completing = False
+f.write('%s %s' % (prev, key))
+else:
+f.write(' %s' % key)
+prev = key
+if completing:
+f.write(str(prev) + '\n')
+else:
+f.write('\n')
+finally:
+_sync_close(f)
+def pack(self):
+"""Re-name messages to eliminate numbering gaps. Invalidates keys."""
+sequences = self.get_sequences()
+prev = 0
+changes = []
+for key in self.iterkeys():
+if key - 1 != prev:
+changes.append((key, prev + 1))
+if hasattr(os, 'link'):
+os.link(os.path.join(self._path, str(key)),
+os.path.join(self._path, str(prev + 1)))
+os.unlink(os.path.join(self._path, str(key)))
+else:
+os.rename(os.path.join(self._path, str(key)),
+os.path.join(self._path, str(prev + 1)))
+prev += 1
+self._next_key = prev + 1
+if len(changes) == 0:
+return
+for name, key_list in sequences.items():
+for old, new in changes:
+if old in key_list:
+key_list[key_list.index(old)] = new
+self.set_sequences(sequences)
+def _dump_sequences(self, message, key):
+"""Inspect a new MHMessage and update sequences appropriately."""
+pending_sequences = message.get_sequences()
+all_sequences = self.get_sequences()
+for name, key_list in all_sequences.iteritems():
+if name in pending_sequences:
+key_list.append(key)
+elif key in key_list:
+del key_list[key_list.index(key)]
+for sequence in pending_sequences:
+if sequence not in all_sequences:
+all_sequences[sequence] = [key]
+self.set_sequences(all_sequences)
+class Babyl(_singlefileMailbox):
+"""An Rmail-style Babyl mailbox."""
+_special_labels = frozenset(('unseen', 'deleted', 'filed', 'answered',
+'forwarded', 'edited', 'resent'))
+def __init__(self, path, factory=None, create=True):
+"""Initialize a Babyl mailbox."""
+_singlefileMailbox.__init__(self, path, factory, create)
+self._labels = {}
+def add(self, message):
+"""Add message and return assigned key."""
+key = _singlefileMailbox.add(self, message)
+if isinstance(message, BabylMessage):
+self._labels[key] = message.get_labels()
+return key
+def remove(self, key):
+"""Remove the keyed message; raise KeyError if it doesn't exist."""
+_singlefileMailbox.remove(self, key)
+if key in self._labels:
+del self._labels[key]
+def __setitem__(self, key, message):
+"""Replace the keyed message; raise KeyError if it doesn't exist."""
+_singlefileMailbox.__setitem__(self, key, message)
+if isinstance(message, BabylMessage):
+self._labels[key] = message.get_labels()
+def get_message(self, key):
+"""Return a Message representation or raise a KeyError."""
+start, stop = self._lookup(key)
+self._file.seek(start)
+self._file.readline()   # Skip '1,' line specifying labels.
+original_headers = StringIO.StringIO()
+while True:
+line = self._file.readline()
+if line == '*** EOOH ***' + os.linesep or line == '':
+break
+original_headers.write(line.replace(os.linesep, '\n'))
+visible_headers = StringIO.StringIO()
+while True:
+line = self._file.readline()
+if line == os.linesep or line == '':
+break
+visible_headers.write(line.replace(os.linesep, '\n'))
+body = self._file.read(stop - self._file.tell()).replace(os.linesep,
+'\n')
+msg = BabylMessage(original_headers.getvalue() + body)
+msg.set_visible(visible_headers.getvalue())
+if key in self._labels:
+msg.set_labels(self._labels[key])
+return msg
+def get_string(self, key):
+"""Return a string representation or raise a KeyError."""
+start, stop = self._lookup(key)
+self._file.seek(start)
+self._file.readline()   # Skip '1,' line specifying labels.
+original_headers = StringIO.StringIO()
+while True:
+line = self._file.readline()
+if line == '*** EOOH ***' + os.linesep or line == '':
+break
+original_headers.write(line.replace(os.linesep, '\n'))
+while True:
+line = self._file.readline()
+if line == os.linesep or line == '':
+break
+return original_headers.getvalue() + \
+self._file.read(stop - self._file.tell()).replace(os.linesep,
+'\n')
+def get_file(self, key):
+"""Return a file-like representation or raise a KeyError."""
+return StringIO.StringIO(self.get_string(key).replace('\n',
+os.linesep))
+def get_labels(self):
+"""Return a list of user-defined labels in the mailbox."""
+self._lookup()
+labels = set()
+for label_list in self._labels.values():
+labels.update(label_list)
+labels.difference_update(self._special_labels)
+return list(labels)
+def _generate_toc(self):
+"""Generate key-to-(start, stop) table of contents."""
+starts, stops = [], []
+self._file.seek(0)
+next_pos = 0
+label_lists = []
+while True:
+line_pos = next_pos
+line = self._file.readline()
+next_pos = self._file.tell()
+if line == '\037\014' + os.linesep:
+if len(stops) < len(starts):
+stops.append(line_pos - len(os.linesep))
+starts.append(next_pos)
+labels = [label.strip() for label
+in self._file.readline()[1:].split(',')
+if label.strip() != '']
+label_lists.append(labels)
+elif line == '\037' or line == '\037' + os.linesep:
+if len(stops) < len(starts):
+stops.append(line_pos - len(os.linesep))
+elif line == '':
+stops.append(line_pos - len(os.linesep))
+break
+self._toc = dict(enumerate(zip(starts, stops)))
+self._labels = dict(enumerate(label_lists))
+self._next_key = len(self._toc)
+def _pre_mailbox_hook(self, f):
+"""Called before writing the mailbox to file f."""
+f.write('BABYL OPTIONS:%sVersion: 5%sLabels:%s%s\037' %
+(os.linesep, os.linesep, ','.join(self.get_labels()),
+os.linesep))
+def _pre_message_hook(self, f):
+"""Called before writing each message to file f."""
+f.write('\014' + os.linesep)
+def _post_message_hook(self, f):
+"""Called after writing each message to file f."""
+f.write(os.linesep + '\037')
+def _install_message(self, message):
+"""Write message contents and return (start, stop)."""
+start = self._file.tell()
+if isinstance(message, BabylMessage):
+special_labels = []
+labels = []
+for label in message.get_labels():
+if label in self._special_labels:
+special_labels.append(label)
+else:
+labels.append(label)
+self._file.write('1')
+for label in special_labels:
+self._file.write(', ' + label)
+self._file.write(',,')
+for label in labels:
+self._file.write(' ' + label + ',')
+self._file.write(os.linesep)
+else:
+self._file.write('1,,' + os.linesep)
+if isinstance(message, email.Message.Message):
+orig_buffer = StringIO.StringIO()
+orig_generator = email.Generator.Generator(orig_buffer, False, 0)
+orig_generator.flatten(message)
+orig_buffer.seek(0)
+while True:
+line = orig_buffer.readline()
+self._file.write(line.replace('\n', os.linesep))
+if line == '\n' or line == '':
+break
+self._file.write('*** EOOH ***' + os.linesep)
+if isinstance(message, BabylMessage):
+vis_buffer = StringIO.StringIO()
+vis_generator = email.Generator.Generator(vis_buffer, False, 0)
+vis_generator.flatten(message.get_visible())
+while True:
+line = vis_buffer.readline()
+self._file.write(line.replace('\n', os.linesep))
+if line == '\n' or line == '':
+break
+else:
+orig_buffer.seek(0)
+while True:
+line = orig_buffer.readline()
+self._file.write(line.replace('\n', os.linesep))
+if line == '\n' or line == '':
+break
+while True:
+buffer = orig_buffer.read(4096) # Buffer size is arbitrary.
+if buffer == '':
+break
+self._file.write(buffer.replace('\n', os.linesep))
+elif isinstance(message, str):
+body_start = message.find('\n\n') + 2
+if body_start - 2 != -1:
+self._file.write(message[:body_start].replace('\n',
+os.linesep))
+self._file.write('*** EOOH ***' + os.linesep)
+self._file.write(message[:body_start].replace('\n',
+os.linesep))
+self._file.write(message[body_start:].replace('\n',
+os.linesep))
+else:
+self._file.write('*** EOOH ***' + os.linesep + os.linesep)
+self._file.write(message.replace('\n', os.linesep))
+elif hasattr(message, 'readline'):
+original_pos = message.tell()
+first_pass = True
+while True:
+line = message.readline()
+self._file.write(line.replace('\n', os.linesep))
+if line == '\n' or line == '':
+self._file.write('*** EOOH ***' + os.linesep)
+if first_pass:
+first_pass = False
+message.seek(original_pos)
+else:
+break
+while True:
+buffer = message.read(4096)     # Buffer size is arbitrary.
+if buffer == '':
+break
+self._file.write(buffer.replace('\n', os.linesep))
+else:
+raise TypeError('Invalid message type: %s' % type(message))
+stop = self._file.tell()
+return (start, stop)
+class Message(email.Message.Message):
+"""Message with mailbox-format-specific properties."""
+def __init__(self, message=None):
+"""Initialize a Message instance."""
+if isinstance(message, email.Message.Message):
+self._become_message(copy.deepcopy(message))
+if isinstance(message, Message):
+message._explain_to(self)
+elif isinstance(message, str):
+self._become_message(email.message_from_string(message))
+elif hasattr(message, "read"):
+self._become_message(email.message_from_file(message))
+elif message is None:
+email.Message.Message.__init__(self)
+else:
+raise TypeError('Invalid message type: %s' % type(message))
+def _become_message(self, message):
+"""Assume the non-format-specific state of message."""
+for name in ('_headers', '_unixfrom', '_payload', '_charset',
+'preamble', 'epilogue', 'defects', '_default_type'):
+self.__dict__[name] = message.__dict__[name]
+def _explain_to(self, message):
+"""Copy format-specific state to message insofar as possible."""
+if isinstance(message, Message):
+return  # There's nothing format-specific to explain.
+else:
+raise TypeError('Cannot convert to specified type')
+class MaildirMessage(Message):
+"""Message with Maildir-specific properties."""
+def __init__(self, message=None):
+"""Initialize a MaildirMessage instance."""
+self._subdir = 'new'
+self._info = ''
+self._date = time.time()
+Message.__init__(self, message)
+def get_subdir(self):
+"""Return 'new' or 'cur'."""
+return self._subdir
+def set_subdir(self, subdir):
+"""Set subdir to 'new' or 'cur'."""
+if subdir == 'new' or subdir == 'cur':
+self._subdir = subdir
+else:
+raise ValueError("subdir must be 'new' or 'cur': %s" % subdir)
+def get_flags(self):
+"""Return as a string the flags that are set."""
+if self._info.startswith('2,'):
+return self._info[2:]
+else:
+return ''
+def set_flags(self, flags):
+"""Set the given flags and unset all others."""
+self._info = '2,' + ''.join(sorted(flags))
+def add_flag(self, flag):
+"""Set the given flag(s) without changing others."""
+self.set_flags(''.join(set(self.get_flags()) | set(flag)))
+def remove_flag(self, flag):
+"""Unset the given string flag(s) without changing others."""
+if self.get_flags() != '':
+self.set_flags(''.join(set(self.get_flags()) - set(flag)))
+def get_date(self):
+"""Return delivery date of message, in seconds since the epoch."""
+return self._date
+def set_date(self, date):
+"""Set delivery date of message, in seconds since the epoch."""
+try:
+self._date = float(date)
+except ValueError:
+raise TypeError("can't convert to float: %s" % date)
+def get_info(self):
+"""Get the message's "info" as a string."""
+return self._info
+def set_info(self, info):
+"""Set the message's "info" string."""
+if isinstance(info, str):
+self._info = info
+else:
+raise TypeError('info must be a string: %s' % type(info))
+def _explain_to(self, message):
+"""Copy Maildir-specific state to message insofar as possible."""
+if isinstance(message, MaildirMessage):
+message.set_flags(self.get_flags())
+message.set_subdir(self.get_subdir())
+message.set_date(self.get_date())
+elif isinstance(message, _mboxMMDFMessage):
+flags = set(self.get_flags())
+if 'S' in flags:
+message.add_flag('R')
+if self.get_subdir() == 'cur':
+message.add_flag('O')
+if 'T' in flags:
+message.add_flag('D')
+if 'F' in flags:
+message.add_flag('F')
+if 'R' in flags:
+message.add_flag('A')
+message.set_from('MAILER-DAEMON', time.gmtime(self.get_date()))
+elif isinstance(message, MHMessage):
+flags = set(self.get_flags())
+if 'S' not in flags:
+message.add_sequence('unseen')
+if 'R' in flags:
+message.add_sequence('replied')
+if 'F' in flags:
+message.add_sequence('flagged')
+elif isinstance(message, BabylMessage):
+flags = set(self.get_flags())
+if 'S' not in flags:
+message.add_label('unseen')
+if 'T' in flags:
+message.add_label('deleted')
+if 'R' in flags:
+message.add_label('answered')
+if 'P' in flags:
+message.add_label('forwarded')
+elif isinstance(message, Message):
+pass
+else:
+raise TypeError('Cannot convert to specified type: %s' %
+type(message))
+class _mboxMMDFMessage(Message):
+"""Message with mbox- or MMDF-specific properties."""
+def __init__(self, message=None):
+"""Initialize an mboxMMDFMessage instance."""
+self.set_from('MAILER-DAEMON', True)
+if isinstance(message, email.Message.Message):
+unixfrom = message.get_unixfrom()
+if unixfrom is not None and unixfrom.startswith('From '):
+self.set_from(unixfrom[5:])
+Message.__init__(self, message)
+def get_from(self):
+"""Return contents of "From " line."""
+return self._from
+def set_from(self, from_, time_=None):
+"""Set "From " line, formatting and appending time_ if specified."""
+if time_ is not None:
+if time_ is True:
+time_ = time.gmtime()
+from_ += ' ' + time.asctime(time_)
+self._from = from_
+def get_flags(self):
+"""Return as a string the flags that are set."""
+return self.get('Status', '') + self.get('X-Status', '')
+def set_flags(self, flags):
+"""Set the given flags and unset all others."""
+flags = set(flags)
+status_flags, xstatus_flags = '', ''
+for flag in ('R', 'O'):
+if flag in flags:
+status_flags += flag
+flags.remove(flag)
+for flag in ('D', 'F', 'A'):
+if flag in flags:
+xstatus_flags += flag
+flags.remove(flag)
+xstatus_flags += ''.join(sorted(flags))
+try:
+self.replace_header('Status', status_flags)
+except KeyError:
+self.add_header('Status', status_flags)
+try:
+self.replace_header('X-Status', xstatus_flags)
+except KeyError:
+self.add_header('X-Status', xstatus_flags)
+def add_flag(self, flag):
+"""Set the given flag(s) without changing others."""
+self.set_flags(''.join(set(self.get_flags()) | set(flag)))
+def remove_flag(self, flag):
+"""Unset the given string flag(s) without changing others."""
+if 'Status' in self or 'X-Status' in self:
+self.set_flags(''.join(set(self.get_flags()) - set(flag)))
+def _explain_to(self, message):
+"""Copy mbox- or MMDF-specific state to message insofar as possible."""
+if isinstance(message, MaildirMessage):
+flags = set(self.get_flags())
+if 'O' in flags:
+message.set_subdir('cur')
+if 'F' in flags:
+message.add_flag('F')
+if 'A' in flags:
+message.add_flag('R')
+if 'R' in flags:
+message.add_flag('S')
+if 'D' in flags:
+message.add_flag('T')
+del message['status']
+del message['x-status']
+maybe_date = ' '.join(self.get_from().split()[-5:])
+try:
+message.set_date(calendar.timegm(time.strptime(maybe_date,
+'%a %b %d %H:%M:%S %Y')))
+except (ValueError, OverflowError):
+pass
+elif isinstance(message, _mboxMMDFMessage):
+message.set_flags(self.get_flags())
+message.set_from(self.get_from())
+elif isinstance(message, MHMessage):
+flags = set(self.get_flags())
+if 'R' not in flags:
+message.add_sequence('unseen')
+if 'A' in flags:
+message.add_sequence('replied')
+if 'F' in flags:
+message.add_sequence('flagged')
+del message['status']
+del message['x-status']
+elif isinstance(message, BabylMessage):
+flags = set(self.get_flags())
+if 'R' not in flags:
+message.add_label('unseen')
+if 'D' in flags:
+message.add_label('deleted')
+if 'A' in flags:
+message.add_label('answered')
+del message['status']
+del message['x-status']
+elif isinstance(message, Message):
+pass
+else:
+raise TypeError('Cannot convert to specified type: %s' %
+type(message))
+class mboxMessage(_mboxMMDFMessage):
+"""Message with mbox-specific properties."""
+class MHMessage(Message):
+"""Message with MH-specific properties."""
+def __init__(self, message=None):
+"""Initialize an MHMessage instance."""
+self._sequences = []
+Message.__init__(self, message)
+def get_sequences(self):
+"""Return a list of sequences that include the message."""
+return self._sequences[:]
+def set_sequences(self, sequences):
+"""Set the list of sequences that include the message."""
+self._sequences = list(sequences)
+def add_sequence(self, sequence):
+"""Add sequence to list of sequences including the message."""
+if isinstance(sequence, str):
+if not sequence in self._sequences:
+self._sequences.append(sequence)
+else:
+raise TypeError('sequence must be a string: %s' % type(sequence))
+def remove_sequence(self, sequence):
+"""Remove sequence from the list of sequences including the message."""
+try:
+self._sequences.remove(sequence)
+except ValueError:
+pass
+def _explain_to(self, message):
+"""Copy MH-specific state to message insofar as possible."""
+if isinstance(message, MaildirMessage):
+sequences = set(self.get_sequences())
+if 'unseen' in sequences:
+message.set_subdir('cur')
+else:
+message.set_subdir('cur')
+message.add_flag('S')
+if 'flagged' in sequences:
+message.add_flag('F')
+if 'replied' in sequences:
+message.add_flag('R')
+elif isinstance(message, _mboxMMDFMessage):
+sequences = set(self.get_sequences())
+if 'unseen' not in sequences:
+message.add_flag('RO')
+else:
+message.add_flag('O')
+if 'flagged' in sequences:
+message.add_flag('F')
+if 'replied' in sequences:
+message.add_flag('A')
+elif isinstance(message, MHMessage):
+for sequence in self.get_sequences():
+message.add_sequence(sequence)
+elif isinstance(message, BabylMessage):
+sequences = set(self.get_sequences())
+if 'unseen' in sequences:
+message.add_label('unseen')
+if 'replied' in sequences:
+message.add_label('answered')
+elif isinstance(message, Message):
+pass
+else:
+raise TypeError('Cannot convert to specified type: %s' %
+type(message))
+class BabylMessage(Message):
+"""Message with Babyl-specific properties."""
+def __init__(self, message=None):
+"""Initialize an BabylMessage instance."""
+self._labels = []
+self._visible = Message()
+Message.__init__(self, message)
+def get_labels(self):
+"""Return a list of labels on the message."""
+return self._labels[:]
+def set_labels(self, labels):
+"""Set the list of labels on the message."""
+self._labels = list(labels)
+def add_label(self, label):
+"""Add label to list of labels on the message."""
+if isinstance(label, str):
+if label not in self._labels:
+self._labels.append(label)
+else:
+raise TypeError('label must be a string: %s' % type(label))
+def remove_label(self, label):
+"""Remove label from the list of labels on the message."""
+try:
+self._labels.remove(label)
+except ValueError:
+pass
+def get_visible(self):
+"""Return a Message representation of visible headers."""
+return Message(self._visible)
+def set_visible(self, visible):
+"""Set the Message representation of visible headers."""
+self._visible = Message(visible)
+def update_visible(self):
+"""Update and/or sensibly generate a set of visible headers."""
+for header in self._visible.keys():
+if header in self:
+self._visible.replace_header(header, self[header])
+else:
+del self._visible[header]
+for header in ('Date', 'From', 'Reply-To', 'To', 'CC', 'Subject'):
+if header in self and header not in self._visible:
+self._visible[header] = self[header]
+def _explain_to(self, message):
+"""Copy Babyl-specific state to message insofar as possible."""
+if isinstance(message, MaildirMessage):
+labels = set(self.get_labels())
+if 'unseen' in labels:
+message.set_subdir('cur')
+else:
+message.set_subdir('cur')
+message.add_flag('S')
+if 'forwarded' in labels or 'resent' in labels:
+message.add_flag('P')
+if 'answered' in labels:
+message.add_flag('R')
+if 'deleted' in labels:
+message.add_flag('T')
+elif isinstance(message, _mboxMMDFMessage):
+labels = set(self.get_labels())
+if 'unseen' not in labels:
+message.add_flag('RO')
+else:
+message.add_flag('O')
+if 'deleted' in labels:
+message.add_flag('D')
+if 'answered' in labels:
+message.add_flag('A')
+elif isinstance(message, MHMessage):
+labels = set(self.get_labels())
+if 'unseen' in labels:
+message.add_sequence('unseen')
+if 'answered' in labels:
+message.add_sequence('replied')
+elif isinstance(message, BabylMessage):
+message.set_visible(self.get_visible())
+for label in self.get_labels():
+message.add_label(label)
+elif isinstance(message, Message):
+pass
+else:
+raise TypeError('Cannot convert to specified type: %s' %
+type(message))
+class MMDFMessage(_mboxMMDFMessage):
+"""Message with MMDF-specific properties."""
+class _ProxyFile:
+"""A read-only wrapper of a file."""
+def __init__(self, f, pos=None):
+"""Initialize a _ProxyFile."""
+self._file = f
+if pos is None:
+self._pos = f.tell()
+else:
+self._pos = pos
+def read(self, size=None):
+"""Read bytes."""
+return self._read(size, self._file.read)
+def readline(self, size=None):
+"""Read a line."""
+return self._read(size, self._file.readline)
+def readlines(self, sizehint=None):
+"""Read multiple lines."""
+result = []
+for line in self:
+result.append(line)
+if sizehint is not None:
+sizehint -= len(line)
+if sizehint <= 0:
+break
+return result
+def __iter__(self):
+"""Iterate over lines."""
+return iter(self.readline, "")
+def tell(self):
+"""Return the position."""
+return self._pos
+def seek(self, offset, whence=0):
+"""Change position."""
+if whence == 1:
+self._file.seek(self._pos)
+self._file.seek(offset, whence)
+self._pos = self._file.tell()
+def close(self):
+"""Close the file."""
+del self._file
+def _read(self, size, read_method):
+"""Read size bytes using read_method."""
+if size is None:
+size = -1
+self._file.seek(self._pos)
+result = read_method(size)
+self._pos = self._file.tell()
+return result
+class _PartialFile(_ProxyFile):
+"""A read-only wrapper of part of a file."""
+def __init__(self, f, start=None, stop=None):
+"""Initialize a _PartialFile."""
+_ProxyFile.__init__(self, f, start)
+self._start = start
+self._stop = stop
+def tell(self):
+"""Return the position with respect to start."""
+return _ProxyFile.tell(self) - self._start
+def seek(self, offset, whence=0):
+"""Change position, possibly with respect to start or stop."""
+if whence == 0:
+self._pos = self._start
+whence = 1
+elif whence == 2:
+self._pos = self._stop
+whence = 1
+_ProxyFile.seek(self, offset, whence)
+def _read(self, size, read_method):
+"""Read size bytes using read_method, honoring start and stop."""
+remaining = self._stop - self._pos
+if remaining <= 0:
+return ''
+if size is None or size < 0 or size > remaining:
+size = remaining
+return _ProxyFile._read(self, size, read_method)
+def _lock_file(f, dotlock=True):
+"""Lock file f using lockf and dot locking."""
+dotlock_done = False
+try:
+if fcntl:
+try:
+fcntl.lockf(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
+except IOError, e:
+if e.errno in (errno.EAGAIN, errno.EACCES):
+raise ExternalClashError('lockf: lock unavailable: %s' %
+f.name)
+else:
+raise
+if dotlock:
+try:
+pre_lock = _create_temporary(f.name + '.lock')
+pre_lock.close()
+except IOError, e:
+if e.errno == errno.EACCES:
+return  # Without write access, just skip dotlocking.
+else:
+raise
+try:
+if hasattr(os, 'link'):
+os.link(pre_lock.name, f.name + '.lock')
+dotlock_done = True
+os.unlink(pre_lock.name)
+else:
+os.rename(pre_lock.name, f.name + '.lock')
+dotlock_done = True
+except OSError, e:
+if e.errno == errno.EEXIST or \
+(os.name == 'os2' and e.errno == errno.EACCES):
+os.remove(pre_lock.name)
+raise ExternalClashError('dot lock unavailable: %s' %
+f.name)
+else:
+raise
+except:
+if fcntl:
+fcntl.lockf(f, fcntl.LOCK_UN)
+if dotlock_done:
+os.remove(f.name + '.lock')
+raise
+def _unlock_file(f):
+"""Unlock file f using lockf and dot locking."""
+if fcntl:
+fcntl.lockf(f, fcntl.LOCK_UN)
+if os.path.exists(f.name + '.lock'):
+os.remove(f.name + '.lock')
+def _create_carefully(path):
+"""Create a file if it doesn't exist and open for reading and writing."""
+fd = os.open(path, os.O_CREAT | os.O_EXCL | os.O_RDWR)
+try:
+return open(path, 'rb+')
+finally:
+os.close(fd)
+def _create_temporary(path):
+"""Create a temp file based on path and open for reading and writing."""
+return _create_carefully('%s.%s.%s.%s' % (path, int(time.time()),
+socket.gethostname(),
+os.getpid()))
+def _sync_flush(f):
+"""Ensure changes to file f are physically on disk."""
+f.flush()
+if hasattr(os, 'fsync'):
+os.fsync(f.fileno())
+def _sync_close(f):
+"""Close file f, ensuring all changes are physically on disk."""
+_sync_flush(f)
+f.close()
+## Start: classes from the original module (for backward compatibility).
+# Note that the Maildir class, whose name is unchanged, itself offers a next()
+# method for backward compatibility.
+class _Mailbox:
+def __init__(self, fp, factory=rfc822.Message):
+self.fp = fp
+self.seekp = 0
+self.factory = factory
+def __iter__(self):
+return iter(self.next, None)
+def next(self):
+while 1:
+self.fp.seek(self.seekp)
+try:
+self._search_start()
+except EOFError:
+self.seekp = self.fp.tell()
+return None
+start = self.fp.tell()
+self._search_end()
+self.seekp = stop = self.fp.tell()
+if start != stop:
+break
+return self.factory(_PartialFile(self.fp, start, stop))
+# Recommended to use PortableUnixMailbox instead!
+class UnixMailbox(_Mailbox):
+def _search_start(self):
+while 1:
+pos = self.fp.tell()
+line = self.fp.readline()
+if not line:
+raise EOFError
+if line[:5] == 'From ' and self._isrealfromline(line):
+self.fp.seek(pos)
+return
+def _search_end(self):
+self.fp.readline()      # Throw away header line
+while 1:
+pos = self.fp.tell()
+line = self.fp.readline()
+if not line:
+return
+if line[:5] == 'From ' and self._isrealfromline(line):
+self.fp.seek(pos)
+return
+# An overridable mechanism to test for From-line-ness.  You can either
+# specify a different regular expression or define a whole new
+# _isrealfromline() method.  Note that this only gets called for lines
+# starting with the 5 characters "From ".
+#
+# BAW: According to
+#http://home.netscape.com/eng/mozilla/2.0/relnotes/demo/content-length.html
+# the only portable, reliable way to find message delimiters in a BSD (i.e
+# Unix mailbox) style folder is to search for "\n\nFrom .*\n", or at the
+# beginning of the file, "^From .*\n".  While _fromlinepattern below seems
+# like a good idea, in practice, there are too many variations for more
+# strict parsing of the line to be completely accurate.
+#
+# _strict_isrealfromline() is the old version which tries to do stricter
+# parsing of the From_ line.  _portable_isrealfromline() simply returns
+# true, since it's never called if the line doesn't already start with
+# "From ".
+#
+# This algorithm, and the way it interacts with _search_start() and
+# _search_end() may not be completely correct, because it doesn't check
+# that the two characters preceding "From " are \n\n or the beginning of
+# the file.  Fixing this would require a more extensive rewrite than is
+# necessary.  For convenience, we've added a PortableUnixMailbox class
+# which does no checking of the format of the 'From' line.
+_fromlinepattern = (r"From \s*[^\s]+\s+\w\w\w\s+\w\w\w\s+\d?\d\s+"
+r"\d?\d:\d\d(:\d\d)?(\s+[^\s]+)?\s+\d\d\d\d\s*"
+r"[^\s]*\s*"
+"$")
+_regexp = None
+def _strict_isrealfromline(self, line):
+if not self._regexp:
+import re
+self._regexp = re.compile(self._fromlinepattern)
+return self._regexp.match(line)
+def _portable_isrealfromline(self, line):
+return True
+_isrealfromline = _strict_isrealfromline
+class PortableUnixMailbox(UnixMailbox):
+_isrealfromline = UnixMailbox._portable_isrealfromline
+class MmdfMailbox(_Mailbox):
+def _search_start(self):
+while 1:
+line = self.fp.readline()
+if not line:
+raise EOFError
+if line[:5] == '\001\001\001\001\n':
+return
+def _search_end(self):
+while 1:
+pos = self.fp.tell()
+line = self.fp.readline()
+if not line:
+return
+if line == '\001\001\001\001\n':
+self.fp.seek(pos)
+return
+class MHMailbox:
+def __init__(self, dirname, factory=rfc822.Message):
+import re
+pat = re.compile('^[1-9][0-9]*$')
+self.dirname = dirname
+# the three following lines could be combined into:
+# list = map(long, filter(pat.match, os.listdir(self.dirname)))
+list = os.listdir(self.dirname)
+list = filter(pat.match, list)
+list = map(long, list)
+list.sort()
+# This only works in Python 1.6 or later;
+# before that str() added 'L':
+self.boxes = map(str, list)
+self.boxes.reverse()
+self.factory = factory
+def __iter__(self):
+return iter(self.next, None)
+def next(self):
+if not self.boxes:
+return None
+fn = self.boxes.pop()
+fp = open(os.path.join(self.dirname, fn))
+msg = self.factory(fp)
+try:
+msg._mh_msgno = fn
+except (AttributeError, TypeError):
+pass
+return msg
+class BabylMailbox(_Mailbox):
+def _search_start(self):
+while 1:
+line = self.fp.readline()
+if not line:
+raise EOFError
+if line == '*** EOOH ***\n':
+return
+def _search_end(self):
+while 1:
+pos = self.fp.tell()
+line = self.fp.readline()
+if not line:
+return
+if line == '\037\014\n' or line == '\037':
+self.fp.seek(pos)
+return
+## End: classes from the original module (for backward compatibility).
+class Error(Exception):
+"""Raised for module-specific errors."""
+class NoSuchMailboxError(Error):
+"""The specified mailbox does not exist and won't be created."""
+class NotEmptyError(Error):
+"""The specified mailbox is not empty and deletion was requested."""
+class ExternalClashError(Error):
+"""Another process caused an action to fail."""
+class FormatError(Error):
+"""A file appears to have an invalid format."""