Applied pre/post sync hooks

Patch from Sylvain FORET in refs #71

offlineimap/ui/Blinkenlights.py

@@ -127,6 +127,10 @@ class BlinkenBase:
             return tf
         finally:
             s.tflock.release()
+
+    def callhook(s, msg):
+        s.gettf().setcolor('white')
+        s.__class__.__bases__[-1].callhook(s, msg)
             
     def sleep(s, sleepsecs):
         s.gettf().setcolor('red')

offlineimap/ui/Machine.py

@@ -175,3 +175,5 @@ class MachineUI(UIBase):
     def init_banner(s):
         s._printData('initbanner', offlineimap.version.banner)
 
+    def callhook(s, msg):
+        s._printData('callhook', msg)

offlineimap/ui/UIBase.py

@@ -322,6 +322,12 @@ class UIBase:
         s.delThreadDebugLog(thread)
         s.unregisterthread(thread)
 
+    ################################################## Hooks
+
+    def callhook(s, msg):
+        if s.verbose >= 0:
+            s._msg(msg)
+
     ################################################## Other
 
     def sleep(s, sleepsecs):