nf-core_modules/modules/salmon/index/main.nf

// Import generic module functions
include { initOptions; saveFiles; getSoftwareName; getProcessName } from './functions'

params.options = [:]
options        = initOptions(params.options)

process SALMON_INDEX {
    tag "$transcript_fasta"
    label "process_medium"
    publishDir "${params.outdir}",
        mode: params.publish_dir_mode,
        saveAs: { filename -> saveFiles(filename:filename, options:params.options, publish_dir:'index', meta:[:], publish_by_meta:[]) }

    conda (params.enable_conda ? 'bioconda::salmon=1.5.2' : null)
    if (workflow.containerEngine == 'singularity' && !params.singularity_pull_docker_container) {
        container "https://depot.galaxyproject.org/singularity/salmon:1.5.2--h84f40af_0"
    } else {
        container "quay.io/biocontainers/salmon:1.5.2--h84f40af_0"
    }

    input:
    path genome_fasta
    path transcript_fasta

    output:
    path "salmon"       , emit: index
    path "versions.yml" , emit: version

    script:
    def software      = getSoftwareName(task.process)
    def get_decoy_ids = "grep '^>' $genome_fasta | cut -d ' ' -f 1 > decoys.txt"
    def gentrome      = "gentrome.fa"
    if (genome_fasta.endsWith('.gz')) {
        get_decoy_ids = "grep '^>' <(gunzip -c $genome_fasta) | cut -d ' ' -f 1 > decoys.txt"
        gentrome      = "gentrome.fa.gz"
    }
    """
    $get_decoy_ids
    sed -i.bak -e 's/>//g' decoys.txt
    cat $transcript_fasta $genome_fasta > $gentrome

    salmon \\
        index \\
        --threads $task.cpus \\
        -t $gentrome \\
        -d decoys.txt \\
        $options.args \\
        -i salmon
    cat <<-END_VERSIONS > versions.yml
    ${getProcessName(task.process)}:
        ${getSoftwareName(task.process)}: \$(salmon --version | sed -e "s/salmon //g")
    END_VERSIONS
    """
}