I'm trying to incorporate a pipeline tool into our instance of Galaxy. My tool 
xml uses the <repeat> tag to allow an end-user to enter a number of different 
fasta/fastq files with information about each of those files so that 
RSEM<http://deweylab.biostat.wisc.edu/rsem/> can be run on all of the files one 
at a time with minimal end-user input. My repeat name is Files.
To do this, I need the tool xml to loop over each file and its input parameters 
to put together a string of input to a perl wrapper (file is in same directory 
as the xml). I tried using 'enumerate' to do this within the <command> tag with 
perl as the interpreter, but I'm noticing some some strange behavior with 
ordering of statements in the tag.
Here's what I have for the tool xml's command tag (aforementioned perl wrapper 
is run-rsem-1.2.3.pl).
 <command interpreter="perl">
        #for $i, $s in enumerate( $Files )
              #if $s.input.fastqmatepair.matepair=="single" 
                --seed-length $s.seedlength --forward-prob $s.fprob -p $s.cpus 
--single_fastq $s.input.fastqmatepair.singlefastq  
                   #if $s.need_bam.yes_bamfile=="yes":
                          --bamfile $s.bam_res
                   #end if
                   #if $s.dostats.stat==1:
                           --fragment-length-mean $s.dostats.fraglenmean
                           --fragment-length-sd $s.dostats.fraglensd
                   #end if
                   #if $s.dorspd.rspd==1:
                            --num-rspd-bins $s.dorspd.rspd_num
                   #end if
#end if
     #end for

I must be missing something above because it does not call run-rsem-1.2.3 for 
each loop iteration. Do I need a break or pause or something within the tag to 
make this enumerate loop work correctly?
FWIW, to debug I added a print statement between the last '#end if' and the 
'#end for' above:
'print "loop iteration $i.\n";'
and this correctly resulted in a number of separate calls to run-rsem-1.2.3, 
but the literal statement "print loop iteration #.\n" was also added as an 
argument to the perl wrapper that caused it to quit early because too many 
input arguments were received.

Please let me know if anything needs clarification. Any help is much 
appreciated - thanks!

Christina Shafer, Ph.D
Bioinformatics Analyst
Regenerative Biology Laboratory
Morgridge Institute for Research
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