[Deskbar] Better Indexer

[Sebastian Pölsterl <marduk k-d-w org>]

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Hi!

I was thinking about the Indexer and how we can improve it, today.
Most notable is that the index for each module that uses it is
re-created each time Deskbar is started. This is just bad. Especially
the programs module takes quite some time to index all .desktop files. I
think the index should be stored to disk and loaded instead of
re-created on start.

I know that kamstrup already did some work on the index branch. Maybe we
can use this as a starting point.

To store the index I'm thinking about a module listed at [1]. They
differ in the type of the value that's stored. If we want to store any
object we have to use shelve. I personally would prefer to store just
strings, because with shelve we get problems with objects from C modules
(we had this problem with storing history in the past).

Comments please ;)

[1]: http://docs.python.org/lib/module-anydbm.html

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Greetings,
Sebastian Pölsterl
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