Jamie Lokier <jamie@shareable.org> writes:

quoted text
>     1. Local Google (by which I mean a search engine on your local machine),
>        Real-time (by which I mean the results are always up to date):
> 
>        Every file modified since last search is known to the query engine.
>        This is a reality: BeOS does it; WinFS is expected to do it.
> 
>        Thus we have real-time local free text search engine, and other
>        features like searching inside files and for file names.  The
>        point is the real-time nature of it: the results you get
>        correspond to exactly the contents of the filesystem at the time of
>        the query (writes which occur _during_ a query are obviously
>        not coherent with this, but writes which complete before the
>        query, even immediately before, appear in the results).

Can be done with dnotify/inotify and a cache daemon keeping track of
mtime.  Yes, this will need a kernel change to make sure mtime always
changed when the file changes, but it does not require anything else.

quoted text
>     2. MP3 player scanning artists & titles:

Same.

quoted text
>     3. Email program scanning for subject lines fast:

Same here.

quoted text
>     4. Blog server caching built pages:
>     5. Programming environment scanning for tags:
>     6. File transfer program scanning for shared deltas.

And so on.

  /Christer

-- 
"Just how much can I get away with and still go to heaven?"

Freelance consultant specializing in device driver programming for Linux 
Christer Weinigel <christer@weinigel.se>  http://www.weinigel.se