How do I write scripts that perform nepomuk searches?

Is there any command line tool for performing nepomuk searches?
Or do I need to write some C/java/perl code using a nepomuk library?

What I wanna do is to make "best of" directories of my photos for each of ten tags. So all photos that has both a certain tag and 5 stars should be copied to a "best of" directory. This should be done for all ten tags, therefore I want to write a script to update the "best of" directories...

Assuming you have the appropriate nepomuksearch:/ url's for your search terms, then you can use kioclient to perform the copying.

I'm not familiar to neither kioclient nor nepomuksearch url's.

As a start, I tried to list the search result of a nepomuk search for items having the tag called my_tag using this command:

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kioclient cat nepomuksearch:/hastag=my_tag

But that didn't work, the only output I had was this:

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erik@brum:~> kioclient cat nepomuksearch:/hastag=my_tag
<unknown program name>(7165)/ ClientApp::doIt: Creating ClientApp
erik@brum:~>

What does this mean?
Is it a syntax error in the nepomuk search URL? (edit: The nepomuk search URL works fine for searches in Dolphin)
Or can't it find any tag called my_tag?
Or am I using kioclient in the wrong way?

Are you sure nepomuksearch:/ is not Dolphin specific? I copy the nepomuk URL into konqueror and it cannot find the KIO slave.

I have no idea, I'm new to nepomuk searches.

I also tried this nepomuk search:

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nepomuksearch:/?query=+hasTag:my_tag

This search also worked in Dolphin, but gave similar output with kioclient:

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erik@brum:~> kioclient cat nepomuksearch:/?query=+hasTag:my_tag
<unknown program name>(7980)/ ClientApp::doIt: Creating ClientApp
erik@brum:~>

I think using kioclient here is wrong because it only retrieves readable data. A search result is not readable in the sense kioclient requires.

These queries should fail:
kioclient cat file:///
kioclient cat nepomuksearch:/?query=+hasTag:my_tag

But, this works, tested on Konsole:
1. Type 'kioclient cat ' in Konsole (notice the space at the end)
2. From Dolphin's search result, drag and drop a file to the terminal. This should put a long nepomuk url.
3. Press Enter. Now the file should be print in the terminal.


How to do scripting? Ruby or Python bindings
Example in Ruby that should get you a starting point:

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require 'korundum4'
require 'nepomuk'
tag = Nepomuk::Tag.new( 'test' )
resource = Nepomuk::Resource.new( '/tmp/test' )
resource.add_tag tag


dpalacio wrote:But, this works, tested on Konsole:
1. Type 'kioclient cat ' in Konsole (notice the space at the end)
2. From Dolphin's search result, drag and drop a file to the terminal. This should put a long nepomuk url.
3. Press Enter. Now the file should be print in the terminal.

Well, this do print the file, but when using drag-and-drop I get the path to that specific file. Then the point of doing the search is gone...

Actually, I had some success. Before, I tried to use 'kioclient cat', which I thought would list the matching files. But it's not listing, its printing the content assuming it's text. So I changed it to 'kioclient copy' to copy the matching files, which is what I want really.

I did like this:

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erik@brum:~> kioclient copy nepomuksearch:/?query=+hasTag:my_tag /tmp/best_of/
<unknown program name>(9649)/ ClientApp::doIt: Creating ClientApp
A KUiServerJobTracker instance contains 1 stalled jobs
erik@brum:~>

I still get almost the same output, but this time it actually copies the files!

Now I only have to figure out how to search for items with a certain rating...

Now I have figured it out. I found some info on the search string syntax on this page: http://techbase.kde.org/Development/Tutorials/Metadata/Nepomuk/QueryService

With that info I figured out the search string I wanted for finding all images that are both tagged with my_tag and rated with at least 4 stars:

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nepomuksearch:/?query=+hasTag:my_tag and rating>=8

Then the search string has to be escaped so that ' ' becomes '%20' and '>' becomes '%3E'.

So, this was my final command for copying all matching files to /tmp/best_of/:

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kioclient copy nepomuksearch:/?query=+hasTag:my_tag%20and%20rating%3E=8 /tmp/best_of/


What would be nice and useful is a `kiols` program. I wrote one in Ruby but it always crashes. Ideally it should be written in C++ and included in KDE runtime.