Add interface: hook can do non-critical exception

2 files changed, 26 insertions, 1 deletions

diff --git a/climl/imap.py b/climl/imap.py
index 68a6e9b..034c77a 100644
--- a/climl/imap.py
+++ b/climl/imap.py
@@ -7,6 +7,8 @@ import backports.ssl as ssl
 import socket
 import time
 
+from . import interface
+
 def conf_boolean_postprocess(src):
     src = src.lower().strip()
     if src == 'true' or src == 'on' or src == '1':
@@ -143,7 +145,11 @@ def main(callback=None):
                     response = connection.fetch([oneid], ['RFC822'])
                     data = response[oneid][b'RFC822']
                     print('calling callback...')
-                    callback('mail: ' + str(oneid) + ': ' + str(data))
+                    try:
+                        callback('mail: ' + str(oneid) + ': ' + str(data))
+                        connection.add_flags([oneid], ['\Seen'])
+                    except interface.HookAbortError:
+                        pass
                     data = None
                 while True:
                     imap_waiter(connection)
diff --git a/climl/interface.py b/climl/interface.py
new file mode 100644
index 0000000..5a7f6ba
--- /dev/null
+++ b/climl/interface.py
@@ -0,0 +1,19 @@
+'''
+This file defines symbols used to make communication between
+hooks/plugins/extensions and core of climl.
+'''
+
+class HookError(Exception):
+    '''
+        Base class for hooks exception, they should not use this directly
+    '''
+
+    pass
+
+class HookAbortError(HookError):
+    '''
+        This exception is used to indicate to core of climl it should not mark
+        email \Seen for now.
+    '''
+
+    pass