Remove sample_id.

tasks/ballgown.wdl

 task ballgown {
     File gene_abundance
     Array[File] ballgown
-    String sample_id
+    String sample_id=basename(gene_abundance, ".gene.abundance.txt")
     String docker
     String cluster
     String disk_size

tasks/count.wdl

 task count {
+    File gene_abundance
     Array[File] ballgown
-    String sample_id
+    String sample_id=basename(gene_abundance, ".gene.abundance.txt")
     String docker
     String cluster
     String disk_size

tasks/fastp.wdl

 task fastp {
-    String sample_id
     File read1
     File read2
+    String sample_id=sub(basename(read1), "_R1\\.(fastq|fq)\\.gz$", "")
     String adapter_sequence
     String adapter_sequence_r2
     String docker

tasks/hisat2.wdl

    File Trim_R1
    File Trim_R2
    String idx_prefix
-   String sample_id
+   String sample_id=basename(Trim_R1, "_R1.fastq.gz")
    String docker
    String cluster
    String disk_size

tasks/samtools.wdl

 task samtools {
     File sam
-    String sample_id
+    String sample_id=basename(sam, ".sam")
     String bam = sample_id + ".bam"
     String sorted_bam = sample_id + ".sorted.bam"
     String percent_bam = sample_id + ".percent.bam"

tasks/stringtie.wdl

     File bam
     File gtf
     String docker
-    String sample_id
+    String sample_id=basename(bam, ".sorted.bam")
     String cluster
     String disk_size
     Int minimum_length_allowed_for_the_predicted_transcripts

workflow.wdl

 import "./tasks/ballgown.wdl" as ballgown
 import "./tasks/count.wdl" as count
 
-
 workflow {{ project_name }} {
 	File read1
 	File read2
 	File screen_ref_dir
 	File fastq_screen_conf
 	File gtf
-	String sample_id
 	String fastp_docker
 	String adapter_sequence
 	String adapter_sequence_r2
 
 	call fastp.fastp as fastp {
 		input: 
-		sample_id=sample_id, 
 		read1 = read1, 
 		read2 = read2,
 		docker = fastp_docker,
 		qualified_quality_phred = qualified_quality_phred,
 		length_required1 = length_required1,
 		disable_quality_filtering = disable_quality_filtering
-		}
+	}
 
 	call fastqc.fastqc as fastqc {
 		input:
 
 	call hisat2.hisat2 as hisat2 {
 		input: 
-		sample_id = sample_id, 
 		idx = idx, 
 		idx_prefix = idx_prefix, 
 		Trim_R1 = fastp.Trim_R1, 
 
 	call samtools.samtools as samtools {
 		input: 
-		sample_id = sample_id, 
 		sam = hisat2.sam,
 		docker = samtools_docker,
 		cluster = samtools_cluster,
 
 	call stringtie.stringtie as stringtie {
 		input: 
-		sample_id = sample_id,
 		gtf = gtf, 
 		bam = samtools.out_bam,
 		docker = stringtie_docker,
 
 	call ballgown.ballgown as ballgown {
 		input: 
-		sample_id = sample_id,
 		docker = ballgown_docker,
 		cluster = ballgown_cluster,
 		ballgown = stringtie.ballgown,
 
 	call count.count as count {
 		input: 
-		sample_id = sample_id,
 		docker = count_docker,
 		cluster = count_cluster,
 		ballgown = stringtie.ballgown,