A KDE hack: Faster mail searches in kmail, using mairix

Kmail searches slowly.

I have been a kmail user for a couple of years, since I settled in my own home office with my own computer.

I like the thing.

However, it annoys me that it takes sooooo long to find a message in my mailstore. Hey, it's only 13000 messages!

So, while I wait for KDE4 to bring all its searching goodness, I decided to see if I could hack something quickly.

Enter mairix: a mail indexer/search thing.

Convincing mairix to index all my mail was rather simple (here is my ~/.mairixrc):

base=/home/ralsina/
maildir=Mail/*...
maildir=.kde/share/apps/kmail/dimap...
omit=Mail/mairix
database=~/.mairix_db

What does it do?

  • It indexes mail stored at ~/Mail and everywhere in my kmail imap folders.
  • It stores search results in ~/Mail/mairix and ignores its contents when searching. The results are stored as links, so they waste no disk space.

After running mairix so it builds its DB (took about a minute, which is less than most kmail searches) , you can search for things like this:

[[email protected] ~]$ time mairix b:bartleblog
Matched 6 messages

real    0m0.232s
user    0m0.012s
sys     0m0.204s

And the result can be seen in kmail, in the mairix folder:

mairix1.png

However, there is a problem. It will work for the first search, but not for the second one. On the second search, you get the same content listing, but all messages appear empty.

That's because kmail saves an index file of each folder. To work around that, I wrote a little shell wrapper, kmairix:

#!/bin/sh
rm ~/Mail/.mairix* -f
mairix $*

And you use that instead of calling mairix directly.

But there are still improvements to be done. If your kmail is currently displaying the mairix folder, searching doesn't update the message list.

DCOP to the rescue! We can switch to the inbox, then back to mairix (adjust as needed for yourself):

dcop kmail KMailIface selectFolder /Local/inbox
dcop kmail KMailIface selectFolder /Local/mairix

Missing pieces:

  • How about switching to the kmail window? Sadly, the kwin DCOP interface seems incomplete. Maybe assigning kmail a hotkey and work from there? Let me know if you have any ideas.

    UPDATE as suggested by Anno Heimburg: just call kmail.

  • A GUI (of course!) probably with a tray icon...

  • A way to auto-update the Mairix DB when new mail arrives. I am thinking about doing it with incron but have not done it yet.

So, here is the final version, put it somewhere in your path, and use ALT+F2 to search your mails :-)

#!/bin/sh
rm ~/Mail/.mairix* -f
mairix $*
dcop kmail KMailIface selectFolder /Local/inbox
dcop kmail KMailIface selectFolder /Local/mairix
kmail

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