On Fri, Mar 15, 2013 at 2:50 PM, Björn Grüning
<bjoern.gruen...@pharmazie.uni-freiburg.de> wrote:
> Hi Peter,
>> > I've looked over the wiki and as far as I can see, 'when' tags used inside
>> > 'conditional' tags only work on another input variable's values.
>> >
>> > I would like to be able to do is a conditional based on the file format
>> > of an input file. For instance, a tool might take XML or tabular files,
>> > and need to show additional parameters for one input type but not the
>> > other.
>> >
>> > Does this enhancement idea seem useful?
>> >
>> > Peter
>> Hello again,
>> I'd still like to be able to show different tool parameters for different
>> input file formats - is anyone else interested in using or working on
>> this?
> Yes! Im using that for a few of my tools, but currently the user need to
> choose the file format, that is suboptimal :(

Thank Bjoern & John for your comments back in March.
I've just filed a Trello card for this:

This was prompted by revisiting my Venn Diagram tool, where it
would be nice to offer a column number parameter when using
a tabular input file (but this is not appropriate for FASTA files):


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