[PATCH] Avoid Fatal error: Word too long from Cyrus IMAP servers by chunking fetch.

[Edward Z. Yang]

Signed-off-by: Edward Z. Yang <ezyang at mit.edu>
---
 offlineimap/folder/IMAP.py |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/offlineimap/folder/IMAP.py b/offlineimap/folder/IMAP.py
index 927c5f4..75bda51 100644
--- a/offlineimap/folder/IMAP.py
+++ b/offlineimap/folder/IMAP.py
@@ -180,7 +180,13 @@ class IMAPFolder(BaseFolder):
             # Now, get the flags and UIDs for these.
             # We could conceivably get rid of maxmsgid and just say
             # '1:*' here.
-            response = imapobj.fetch(messagesToFetch, '(FLAGS UID)')[1]
+            batchNum = 50
+            response = []
+            queueOfMessagesToFetch = messagesToFetch.split(',')
+            while queueOfMessagesToFetch:
+                batch = queueOfMessagesToFetch[0:batchNum]
+                queueOfMessagesToFetch = queueOfMessagesToFetch[batchNum:]
+                response += imapobj.fetch(','.join(batch), '(FLAGS UID)')[1]
         finally:
             self.imapserver.releaseconnection(imapobj)
         for messagestr in response:
-- 
1.7.0.4