Support maildir for windows

That makes OfflineIMAP to use exclamation mark (!) instead of colon for storing
messages. Such files can be written to windows partitions. But you will probably
loose compatibility with other programs trying to read the same Maildir.

Signed-off-by: Vladimir Marek <vladimir.marek@oracle.com>
Reviewed-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/folder/Maildir.py

@@ -31,7 +31,6 @@ except ImportError:
 from offlineimap import OfflineImapError
 
 uidmatchre = re.compile(',U=(\d+)')
-flagmatchre = re.compile(':.*2,([A-Z]+)')
 timestampmatchre = re.compile('(\d+)');
 
 timeseq = 0
@@ -63,6 +62,17 @@ class MaildirFolder(BaseFolder):
         self.messagelist = None
         self.repository = repository
         self.accountname = accountname
+
+        self.wincompatible = self.config.getdefaultboolean(
+            "Account "+self.accountname, "maildir-windows-compatible", False)
+
+        if self.wincompatible == False:
+            self.infosep = ':'
+        else:
+            self.infosep = '!'
+
+        self.flagmatchre = re.compile(self.infosep + '.*2,([A-Z]+)')
+
         BaseFolder.__init__(self)
         #self.ui is set in BaseFolder.init()
         # Cache the full folder path, as we use getfullname() very often
@@ -156,7 +166,7 @@ class MaildirFolder(BaseFolder):
                     nouidcounter -= 1
                 else:
                     uid = long(uidmatch.group(1))
-            flagmatch = flagmatchre.search(messagename)
+            flagmatch = self.flagmatchre.search(messagename)
             flags = []
             if flagmatch:
                 flags = [x for x in flagmatch.group(1)]
@@ -271,11 +281,12 @@ class MaildirFolder(BaseFolder):
             dir_prefix = 'cur'
         else:
             dir_prefix = 'new'
-        infostr = ':'
-        infomatch = re.search('(:.*)$', newname)
+
+        infostr = self.infosep
+        infomatch = re.search('(' + self.infosep + '.*)$', newname)
         if infomatch:                   # If the info string is present..
             infostr = infomatch.group(1)
-            newname = newname.split(':')[0] # Strip off the info string.
+            newname = newname.split(self.infosep)[0] # Strip off the info string.
         infostr = re.sub('2,[A-Z]*', '', infostr)
         flags.sort()
         infostr += '2,' + ''.join(flags)