Rework UI system to make use of the logging module

Logging was flawed as the output was e.g. heavily buffered and people
complained about missing log entries. Fix this by making use of the
standard logging facilities that offlineimap offers.

This is one big ugly patch that does many things. It fixes the
Blinkenlights backend to work again with the logging facilities.

Resize windows and hotkeys are still not handled absolut correctly, this
is left for future fixing. THe rest of the backends should be working fine.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

offlineimap/ui/Noninteractive.py

@@ -1,6 +1,5 @@
 # Noninteractive UI
-# Copyright (C) 2002 John Goerzen
-# <jgoerzen@complete.org>
+# Copyright (C) 2002-2011 John Goerzen & contributors
 #
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -16,37 +15,15 @@
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 
-import sys
-import time
+import logging
 from UIBase import UIBase
 
 class Basic(UIBase):
-    def getpass(s, accountname, config, errmsg = None):
-        raise NotImplementedError, "Prompting for a password is not supported in noninteractive mode."
+    """'Quiet' simply sets log level to INFO"""
+    def __init__(self, config, loglevel = logging.INFO):
+        return super(Basic, self).__init__(config, loglevel)
 
-    def _display(s, msg):
-        print msg
-        sys.stdout.flush()
-
-    def warn(s, msg, minor = 0):
-        warntxt = 'WARNING'
-        if minor:
-            warntxt = 'warning'
-        sys.stderr.write(warntxt + ": " + str(msg) + "\n")
-
-    def sleep(s, sleepsecs, siglistener):
-        if s.verbose >= 0:
-            s._msg("Sleeping for %d:%02d" % (sleepsecs / 60, sleepsecs % 60))
-        return UIBase.sleep(s, sleepsecs, siglistener)
-
-    def sleeping(s, sleepsecs, remainingsecs):
-        if sleepsecs > 0:
-            time.sleep(sleepsecs)
-        return 0
-
-    def locked(s):
-        s.warn("Another OfflineIMAP is running with the same metadatadir; exiting.")
-
-class Quiet(Basic):
-    def __init__(s, config, verbose = -1):
-        Basic.__init__(s, config, verbose)
+class Quiet(UIBase):
+    """'Quiet' simply sets log level to WARNING"""
+    def __init__(self, config, loglevel = logging.WARNING):
+        return super(Quiet, self).__init__(config, loglevel)