assemble_refbased -- do not fail when reads do not align

pipes/WDL/tasks/tasks_assembly.wdl

@@ -265,7 +265,7 @@ task align_reads {
   }
 
   command {
-    set -ex -o pipefail
+    set -ex # do not set pipefail, since grep exits 1 if it can't find the pattern
 
     read_utils.py --version | tee VERSION
 
@@ -298,10 +298,13 @@ task align_reads {
         --loglevel=DEBUG
 
     else
-      touch "${sample_name}.all.bam" "${sample_name}.mapped.bam"
+      # handle special case of empty reference fasta -- emit empty bams (with original bam headers)
+      samtools view -H -b "${reads_unmapped_bam}" > "${sample_name}.all.bam"
+      samtools view -H -b "${reads_unmapped_bam}" > "${sample_name}.mapped.bam"
 
+      samtools index "${sample_name}.all.bam" "${sample_name}.all.bai"
+      samtools index "${sample_name}.mapped.bam" "${sample_name}.mapped.bai"
     fi
-    samtools index ${sample_name}.mapped.bam
 
     # collect figures of merit
     grep -v '^>' assembly.fasta | tr -d '\nNn' | wc -c | tee assembly_length_unambiguous
@@ -311,7 +314,7 @@ task align_reads {
     samtools view -h -F 260 ${sample_name}.all.bam | samtools flagstat - | tee ${sample_name}.all.bam.flagstat.txt
     grep properly ${sample_name}.all.bam.flagstat.txt | cut -f 1 -d ' ' | tee read_pairs_aligned
     samtools view ${sample_name}.mapped.bam | cut -f10 | tr -d '\n' | wc -c | tee bases_aligned
-    python -c "print (float("$(cat bases_aligned)")/"$(cat assembly_length_unambiguous)") if "$(cat assembly_length_unambiguous)">0 else 0" > mean_coverage
+    python -c "print (float("$(cat bases_aligned)")/"$(cat assembly_length_unambiguous)") if "$(cat assembly_length_unambiguous)">0 else print(0)" > mean_coverage
 
     # fastqc mapped bam
     reports.py fastqc ${sample_name}.mapped.bam ${sample_name}.mapped_fastqc.html --out_zip ${sample_name}.mapped_fastqc.zip
@@ -404,9 +407,10 @@ task refine_assembly_with_aligned_reads {
         file_utils.py rename_fasta_sequences \
           refined.fasta "${sample_name}.fasta" "${sample_name}"
 
-      # collect figures of merit
-      grep -v '^>' refined.fasta | tr -d '\n' | wc -c | tee assembly_length
-      grep -v '^>' refined.fasta | tr -d '\nNn' | wc -c | tee assembly_length_unambiguous
+        # collect figures of merit
+        set +o pipefail # grep will exit 1 if it fails to find the pattern
+        grep -v '^>' refined.fasta | tr -d '\n' | wc -c | tee assembly_length
+        grep -v '^>' refined.fasta | tr -d '\nNn' | wc -c | tee assembly_length_unambiguous
     }
 
     output {
@@ -570,6 +574,7 @@ task refine_2x_and_plot {
           --loglevel=DEBUG
 
         # collect figures of merit
+        set +o pipefail # grep will exit 1 if it fails to find the pattern
         grep -v '^>' ${sample_name}.fasta | tr -d '\n' | wc -c | tee assembly_length
         grep -v '^>' ${sample_name}.fasta | tr -d '\nNn' | wc -c | tee assembly_length_unambiguous
         samtools view -c ${sample_name}.mapped.bam | tee reads_aligned
@@ -578,7 +583,7 @@ task refine_2x_and_plot {
         grep properly ${sample_name}.all.bam.flagstat.txt | cut -f 1 -d ' ' | tee read_pairs_aligned
         samtools view ${sample_name}.mapped.bam | cut -f10 | tr -d '\n' | wc -c | tee bases_aligned
         #echo $(( $(cat bases_aligned) / $(cat assembly_length) )) | tee mean_coverage
-        python -c "print (float("$(cat bases_aligned)")/"$(cat assembly_length)") if "$(cat assembly_length)">0 else 0" > mean_coverage
+        python -c "print (float("$(cat bases_aligned)")/"$(cat assembly_length)") if "$(cat assembly_length)">0 else print(0)" > mean_coverage
 
         # fastqc mapped bam
         reports.py fastqc ${sample_name}.mapped.bam ${sample_name}.mapped_fastqc.html --out_zip ${sample_name}.mapped_fastqc.zip

pipes/WDL/tasks/tasks_reports.wdl

@@ -49,12 +49,13 @@ task plot_coverage {
     fi
 
     # collect figures of merit
+    set +o pipefail # grep will exit 1 if it fails to find the pattern
     samtools view -H ${aligned_reads_bam} | perl -n -e'/^@SQ.*LN:(\d+)/ && print "$1\n"' |  python -c "import sys; print(sum(int(x) for x in sys.stdin))" | tee assembly_length
     # report only primary alignments 260=exclude unaligned reads and secondary mappings
     samtools view -h -F 260 ${aligned_reads_bam} | samtools flagstat - | tee ${sample_name}.flagstat.txt
     grep properly ${sample_name}.flagstat.txt | cut -f 1 -d ' ' | tee read_pairs_aligned
     samtools view ${aligned_reads_bam} | cut -f10 | tr -d '\n' | wc -c | tee bases_aligned
-    python -c "print (float("$(cat bases_aligned)")/"$(cat assembly_length)") if "$(cat assembly_length)">0 else 0" > mean_coverage
+    python -c "print (float("$(cat bases_aligned)")/"$(cat assembly_length)") if "$(cat assembly_length)">0 else print(0)" > mean_coverage
   }
 
   output {

pipes/WDL/workflows/assemble_refbased.wdl

@@ -8,7 +8,7 @@ workflow assemble_refbased {
 
     meta {
         description: "Reference-based microbial consensus calling. Aligns short reads to a singular reference genome, calls a new consensus sequence, and emits: new assembly, reads aligned to provided reference, reads aligned to new assembly, various figures of merit, plots, and QC metrics. The user may provide unaligned reads spread across multiple input files and this workflow will parallelize alignment per input file before merging results prior to consensus calling."
-        author: "Viral Genomics"
+        author: "Broad Viral Genomics"
         email:  "viral-ngs@broadinstitute.org"
     }
 

pipes/WDL/workflows/beast_to_auspice.wdl

@@ -5,6 +5,8 @@ import "../tasks/tasks_nextstrain.wdl" as nextstrain
 workflow beast_to_auspice {
     meta {
         description: "Visualize BEAST output with Nextstrain. This workflow converts a BEAST MCC tree (.tree file) into an Auspice v2 json file. See https://nextstrain-augur.readthedocs.io/en/stable/faq/import-beast.html for details."
+        author: "Broad Viral Genomics"
+        email:  "viral-ngs@broadinstitute.org"
     }
 
     input {

pipes/WDL/workflows/build_augur_tree.wdl

@@ -5,6 +5,8 @@ import "../tasks/tasks_nextstrain.wdl" as nextstrain
 workflow build_augur_tree {
     meta {
         description: "Align assemblies, build trees, and convert to json representation suitable for Nextstrain visualization. See https://nextstrain.org/docs/getting-started/ and https://nextstrain-augur.readthedocs.io/en/stable/"
+        author: "Broad Viral Genomics"
+        email:  "viral-ngs@broadinstitute.org"
     }
 
     input {

pipes/WDL/workflows/classify_multi.wdl

@@ -9,6 +9,8 @@ import "../tasks/tasks_reports.wdl" as reports
 workflow classify_multi {
     meta {
          description: "Runs raw reads through taxonomic classification (Kraken2), human read depletion (based on Kraken2), de novo assembly (SPAdes), taxonomic classification of contigs (BLASTx), and FASTQC/multiQC of reads."
+         author: "Broad Viral Genomics"
+         email:  "viral-ngs@broadinstitute.org"
     }
 
     input {

pipes/WDL/workflows/genbank.wdl

@@ -7,6 +7,8 @@ workflow genbank {
 
     meta {
         description: "Prepare assemblies for Genbank submission. This includes annotation by simple coordinate transfer from Genbank annotations and a multiple alignment. See https://viral-pipelines.readthedocs.io/en/latest/ncbi_submission.html for details."
+        author: "Broad Viral Genomics"
+        email:  "viral-ngs@broadinstitute.org"
     }
 
     input {

pipes/WDL/workflows/newick_to_auspice.wdl

@@ -5,6 +5,8 @@ import "../tasks/tasks_nextstrain.wdl" as nextstrain
 workflow newick_to_auspice {
     meta {
         description: "Convert a newick formatted phylogenetic tree into a json suitable for auspice visualization. See https://nextstrain-augur.readthedocs.io/en/stable/usage/cli/export.html"
+        author: "Broad Viral Genomics"
+        email:  "viral-ngs@broadinstitute.org"
     }
 
     call nextstrain.export_auspice_json