Re: [Tracker] Example of how to filter tracker-tag searches

[Martyn Russell <martyn lanedo com>]

On 22/03/13 15:18, Douglas Macdonald wrote:
> Hello,

Hello Douglas,

> Thank you for 'tracker'.
>
> I am having a little trouble understanding the manual page for the
> 'tracker-tag'.
>
> I can not figure how to filter/combine tag searches and the use of:
> "       -r, --or-operator
>                Use OR for search terms instead of AND (the default)"
>
> Could someone please point me to a little example?

You're right, this is ambiguous. I've fixed this in the tracker-0.16 
branch and will push to master too. See:

https://git.gnome.org/browse/tracker/commit/?h=tracker-0.16&id=dc70a210b5f81475055b6e2f350fd10fee1a3953

> I am trying to do something like
>
> tracker-tag -t tag1 [AND] tag2 ...
>
> tracker-tag tag1 [OR] tag2 ...

The issue here is, logical AND is not possible. The "tag" being 
specified in this case is the label for the tag. Tags don't have 
multiple labels. The only thing that can have multiple labels (and by 
extension, tags) is files. So by specifying AND operations (or the 
default until I fixed it), was looking for all tags which had the label 
"foo" and "bar", which is always going to result in nothing returned.

What you really want is logical OR, i.e. list all tags matching "foo OR 
bar OR baz". I've fixed the documentation and implementation to make 
sure this is the case now. Without updating, you can do this with 
tracker-tag -t -r tag1 tag2 ...

--
Regards,
Martyn

Founder and CEO of Lanedo GmbH.