Re: [Tracker] chm mime type

[Martyn Russell <martyn lanedo com>]

On 21/03/11 16:55, Rustom Mody wrote:
> On Mon, Mar 21, 2011 at 3:30 PM, Martyn Russell <martyn lanedo com
> <mailto:martyn lanedo com>> wrote:
>
>     On 21/03/11 08:26, ivan frade nokia com
>     <mailto:ivan frade nokia com> wrote:
>
>         Hi Rusi,
>
>
>     Hi,
>
>         Fairly easy. You need to implement a extractor module for that
>         mimetype. It means to implement a couple of mandatory functions,
>         build it and install it in the right location.
>
>     <<snipped>>
>
>     Great advise from Ivan there. I just wanted to warn you, these APIs
>     and examples have changed in master recently. So depending on where
>     you're targeting, you might want to look at the source.
>
>
> Thanks both for the answers.
> I had a first look and see that it needs to be in glib/gdk etc.  I must
> admit this will be a bit of a learning curve.
> On the other hand what needs to be done is (seems) quite trivial
> 1. Run extract_chmLib on the chm file (opening into /tmp/newdirname )
> 2. Run the tracker on the dir
> 3. Integrate the results of 2 back into the database
>
> 1 and 2 seem trivial and would likely be literally 1-liners in something
> like python

Make use of other extractors, they use functions available to make 
things easier (like tracker_open()). Note the APIs in libtracker-extract 
too.

> About 3 I dont know...

There are a few things you can do here.

1. Look at the ontology to see what properties you can export and what's 
not supported. The tracker-sparql command comes in handy for this, e.g.:

$ tracker-sparql -s document
Classes:
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#Document
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#TextDocument

http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#PlainTextDocument
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#HtmlDocument

http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#PaginatedTextDocument
  http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#HelpDocument

Properties:
  None

--

You can use tracker-sparql to get properties and other information about 
classes to know what to use.

> Anyhow I think its still too premature for me to talk before I can find
> my way around.
> For example I have a man page for tracker-extract but
> $ tracker-extract
> gives command not found

Commands instantiated by d-bus are installed into $prefix/libexec, this 
includes tracker-store, tracker-miner-fs, tracker-miner-rss, 
tracker-miner-flickr, tracker-writeback and of course tracker-extract.

--
Regards,
Martyn