[PATCH] Pass relevant maildir filenames to newmail_hook

[gwn]

So that the hook can implement advanced features that acts on the
newly synced mail content.

...

Greetings. I was looking for a way to automatically get the
content of the newly synced emails after I run offlineimap.

Initially I tried to parse the output of `offlineimap -u
machineui` to generate the relevant maildir filenames, but I could
not accomplish that.

So here is an example solution using the "newmail_hook"
configuration option.

I implemented this patch just to get the idea across, I'd be very
happy to hear alternative solutions that doesn't require patching
offlineimap.

Also please note that this patch is not backwards compatible as it
causes "newmail_hook" lambdas with no arguments trigger
exceptions.

---
 offlineimap/folder/Base.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/offlineimap/folder/Base.py b/offlineimap/folder/Base.py
index 5f287fa..f1376b7 100644
--- a/offlineimap/folder/Base.py
+++ b/offlineimap/folder/Base.py
@@ -947,8 +947,18 @@ class BaseFolder(object):
 
         # Execute new mail hook if we have new mail.
         if self.have_newmail:
+            dstfolder_fullname = dstfolder.getfullname()
+
+            newmail_filenames = [
+                os.path.join(
+                    dstfolder_fullname,
+                    dstfolder.messagelist[uid]['filename']
+                )
+                    for uid in copylist
+            ]
+
             if self.newmail_hook != None:
-                self.newmail_hook()
+                self.newmail_hook(newmail_filenames)
 
     def __syncmessagesto_delete(self, dstfolder, statusfolder):
         """Pass 2: Remove locally deleted messages on dst.
-- 
2.22.0