Implement a hook that runs periodically

This creates a deferred that runs on a user configurable timer and is
provided the ui. This deferred will re-fire after the number of seconds
specified by the timer are eclipsed. By default this is 300 seconds.

Fixes #522

1 files changed, 10 insertions, 1 deletions

diff --git a/alot/ui.py b/alot/ui.py
index 0208288c..ba708804 100644
--- a/alot/ui.py
+++ b/alot/ui.py
@@ -7,7 +7,7 @@ import logging
 import os
 import signal
 
-from twisted.internet import reactor, defer
+from twisted.internet import reactor, defer, task
 import urwid
 
 from .settings import settings
@@ -103,6 +103,15 @@ class UI(object):
                                        unhandled_input=self._unhandled_input,
                                        input_filter=self._input_filter)
 
+        # Create a defered that calls the loop_hook
+        loop_hook = settings.get_hook('loop_hook')
+        if loop_hook:
+            loop = task.LoopingCall(loop_hook, ui=self)
+            loop_defered = loop.start(settings.get('periodic_hook_frequency'))
+            loop_defered.addErrback(
+                lambda e: logging.error('error in loop hook %s',
+                                        e.getErrorMessage()))
+
         # set up colours
         colourmode = int(settings.get('colourmode'))
         logging.info('setup gui in %d colours', colourmode)