add process fastqdump

src/nf_modules/sra-tools/tests/fastqdump.nf

+/*
+* sra-tools :
+
+*/
+
+/*                      fastq-dump
+* Imputs : srr list
+* Outputs : fastq files
+*/
+
+params.list_srr = "$baseDir/data/SRR/*.txt"
+
+log.info "downloading list srr : ${params.list_srr}"
+
+Channel
+  .fromPath( params.list_srr )
+  .ifEmpty { error "Cannot find any bam files matching: ${params.list_srr}" }
+  .splitCsv(header: true)
+  .set { SRR }
+
+//run is the column name containing SRR ids
+
+  process fastqdump {
+  tag {"${x.run}"}
+  publishDir "results/download/fastq/${x.run}/", mode: 'copy'
+  input:
+  val x  from SRR
+  output:
+  file("*") into fastq
+
+  script:
+
+  """
+ #for test only 10000  reads are downloading with the option -N 10000 -X 20000
+  fastq-dump --split-files --defline-seq '@\$ac_\$si/\$ri' --defline-qual "+" -N 10000 -X 20000 ${x.run}
+  if [ -f ${x.run}_1.fastq ]
+  then
+    true
+  else
+    touch ${x.run}.fastq
+  fi
+"""
+  }