revise fastqscreen output

tasks/fastqscreen.wdl

@@ -25,11 +25,11 @@ task fastq_screen {
 		dataDisk:"cloud_ssd " + disk_size + " /cromwell_root/"
 	}
 	output {
-		File png1 = "${read1name}_screen.png"
-		File txt1 = "${read1name}_screen.txt"
-		File html1 = "${read1name}_screen.html"
-		File png2 = "${read2name}_screen.png"
-		File txt2 = "${read2name}_screen.txt"
-		File html2 = "${read2name}_screen.html"
+		File png1 = sub(basename(read1), "\\.(fastq|fq)\\.gz$", "_screen.png")
+		File txt1 = sub(basename(read1), "\\.(fastq|fq)\\.gz$", "_screen.txt")
+		File html1 = sub(basename(read1), "\\.(fastq|fq)\\.gz$", "_screen.html")
+		File png2 = sub(basename(read2), "\\.(fastq|fq)\\.gz$", "_screen.png")
+		File txt2 = sub(basename(read2), "\\.(fastq|fq)\\.gz$", "_screen.txt")
+		File html2 = sub(basename(read2), "\\.(fastq|fq)\\.gz$", "_screen.html")
 	}
 }