tool with multiple undefined output datasets - galaxy-dev

29 Jul 2015

      Hi,
I am trying to develop a tool to untar, unzip... an archive file in 
order to obtain each file contained in the archive as a dataset in the 
current history.
My problem is about the unknown various number of files contained within 
the archive file.
I was thinking about having an output variable in my .xml that would be 
fed by my wrapper and returned in order to filter the number of outputs 
in my .xml ; but the <output> section in the .xml can only get "files" 
not numbers, right?
In my tool, I ask the user to fill the number of files he wants from the 
archive ;
in  .xml I have put 10 outputs for files contained in the archive (out1, 
out2...) precised in my command and in the output section (for now I can 
retrieve maximum 10 outputs from my archive).
In the output section, I would like to use <filter> tag in order to 
select only the output number inferior than the number specified by the 
user:
<outputs>
           <data name="output_uncomp1" 
format="${uncompressed_files_format}" label="${input_compressed.name}_1"/>
           <data name="output_uncomp2" 
format="${uncompressed_files_format}" label="${input_compressed.name}_2">
            <filter>num_uncompressed_files >= "2"</filter>
           </data>
           <data name="output_uncomp3" 
format="${uncompressed_files_format}" label="${input_compressed.name}_3">
            <filter>num_decompressed_files>= "3"</filter>
           </data>
It does not seem to work well. Could you please tell me if it is 
possible to use the filter tag as such? If so, how?
Would you have a better idea to implement that tool?
Thanks in advance,
best regards,
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Sabrina

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