nf-core_modules/software/bowtie2/align/main.nf

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// Import generic module functions
include { initOptions; saveFiles; getSoftwareName } from './functions'
params.options = [:]
options = initOptions(params.options)
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process BOWTIE2_ALIGN {
tag "$meta.id"
label 'process_high'
publishDir "${params.outdir}",
mode: params.publish_dir_mode,
saveAs: { filename -> saveFiles(filename:filename, options:params.options, publish_dir:getSoftwareName(task.process), meta:meta, publish_by_meta:['id']) }
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conda (params.enable_conda ? 'bioconda::bowtie2=2.4.2 bioconda::samtools=1.11 conda-forge::pigz=2.3.4' : null)
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if (workflow.containerEngine == 'singularity' && !params.singularity_pull_docker_container) {
container "https://depot.galaxyproject.org/singularity/mulled-v2-ac74a7f02cebcfcc07d8e8d1d750af9c83b4d45a:577a697be67b5ae9b16f637fd723b8263a3898b3-0"
} else {
container "quay.io/biocontainers/mulled-v2-ac74a7f02cebcfcc07d8e8d1d750af9c83b4d45a:577a697be67b5ae9b16f637fd723b8263a3898b3-0"
}
input:
tuple val(meta), path(reads)
path index
output:
tuple val(meta), path('*.bam'), emit: bam
tuple val(meta), path('*.log'), emit: log
path '*.version.txt' , emit: version
tuple val(meta), path('*fastq.gz'), optional:true, emit: fastq
script:
def split_cpus = Math.floor(task.cpus/2)
def software = getSoftwareName(task.process)
def prefix = options.suffix ? "${meta.id}${options.suffix}" : "${meta.id}"
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if (meta.single_end) {
def unaligned = params.save_unaligned ? "--un-gz ${prefix}.unmapped.fastq.gz" : ''
"""
INDEX=`find -L ./ -name "*.rev.1.bt2" | sed 's/.rev.1.bt2//'`
bowtie2 \\
-x \$INDEX \\
-U $reads \\
--threads ${split_cpus} \\
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$unaligned \\
$options.args \\
2> ${prefix}.bowtie2.log \\
| samtools view -@ ${split_cpus} $options.args2 -bhS -o ${prefix}.bam -
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echo \$(bowtie2 --version 2>&1) | sed 's/^.*bowtie2-align-s version //; s/ .*\$//' > ${software}.version.txt
"""
} else {
def unaligned = params.save_unaligned ? "--un-conc-gz ${prefix}.unmapped.fastq.gz" : ''
"""
INDEX=`find -L ./ -name "*.rev.1.bt2" | sed 's/.rev.1.bt2//'`
bowtie2 \\
-x \$INDEX \\
-1 ${reads[0]} \\
-2 ${reads[1]} \\
--threads ${split_cpus} \\
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$unaligned \\
$options.args \\
2> ${prefix}.bowtie2.log \\
| samtools view -@ ${split_cpus} $options.args2 -bhS -o ${prefix}.bam -
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if [ -f ${prefix}.unmapped.fastq.1.gz ]; then
mv ${prefix}.unmapped.fastq.1.gz ${prefix}.unmapped_1.fastq.gz
fi
if [ -f ${prefix}.unmapped.fastq.2.gz ]; then
mv ${prefix}.unmapped.fastq.2.gz ${prefix}.unmapped_2.fastq.gz
fi
echo \$(bowtie2 --version 2>&1) | sed 's/^.*bowtie2-align-s version //; s/ .*\$//' > ${software}.version.txt
"""
}
}