added cutadapt module and tests

software/cutadapt/functions.nf

@@ -0,0 +1,59 @@
+/*
+ * -----------------------------------------------------
+ *  Utility functions used in nf-core DSL2 module files
+ * -----------------------------------------------------
+ */
+
+/*
+ * Extract name of software tool from process name using $task.process
+ */
+def getSoftwareName(task_process) {
+    return task_process.tokenize(':')[-1].tokenize('_')[0].toLowerCase()
+}
+
+/*
+ * Function to initialise default values and to generate a Groovy Map of available options for nf-core modules
+ */
+def initOptions(Map args) {
+    def Map options = [:]
+    options.args          = args.args ?: ''
+    options.args2         = args.args2 ?: ''
+    options.publish_by_id = args.publish_by_id ?: false
+    options.publish_dir   = args.publish_dir ?: ''
+    options.publish_files = args.publish_files
+    options.suffix        = args.suffix ?: ''
+    return options
+}
+
+/*
+ * Tidy up and join elements of a list to return a path string
+ */
+def getPathFromList(path_list) {
+    def paths = path_list.findAll { item -> !item?.trim().isEmpty() }  // Remove empty entries
+    paths = paths.collect { it.trim().replaceAll("^[/]+|[/]+\$", "") } // Trim whitespace and trailing slashes
+    return paths.join('/')
+}
+
+/*
+ * Function to save/publish module results
+ */
+def saveFiles(Map args) {
+    if (!args.filename.endsWith('.version.txt')) {
+        def ioptions = initOptions(args.options)
+        def path_list = [ ioptions.publish_dir ?: args.publish_dir ]
+        if (ioptions.publish_by_id) {
+            path_list.add(args.publish_id)
+        }
+        if (ioptions.publish_files instanceof Map) {
+            for (ext in ioptions.publish_files) {
+                if (args.filename.endsWith(ext.key)) {
+                    def ext_list = path_list.collect()
+                    ext_list.add(ext.value)
+                    return "${getPathFromList(ext_list)}/$args.filename"
+                }
+            }
+        } else if (ioptions.publish_files == null) {
+            return "${getPathFromList(path_list)}/$args.filename"
+        }
+    }
+}

software/cutadapt/main.nf

@@ -0,0 +1,42 @@
+// Import generic module functions
+include { initOptions; saveFiles; getSoftwareName } from './functions'
+
+params.options = [:]
+def options    = initOptions(params.options)
+
+process CUTADAPT {
+    tag "$meta.id"
+    label 'process_medium'
+    publishDir "${params.outdir}",
+        mode: params.publish_dir_mode,
+        saveAs: { filename -> saveFiles(filename:filename, options:params.options, publish_dir:getSoftwareName(task.process), publish_id:meta.id) }
+
+    conda (params.enable_conda ? 'bioconda::cutadapt:3.2' : null)
+    if (workflow.containerEngine == 'singularity' && !params.singularity_pull_docker_container) {
+        container 'https://depot.galaxyproject.org/singularity/cutadapt:3.2--py38h0213d0e_0'
+    } else {
+        container 'quay.io/biocontainers/cutadapt:3.2--py38h0213d0e_0'
+    }
+
+    input:
+    tuple val(meta), path(reads)
+
+    output:
+    tuple val(meta), path('*.trim.fastq.gz'), emit: reads
+    tuple val(meta), path('*.log')          , emit: log
+    path '*.version.txt'                    , emit: version
+
+    script:
+    def software = getSoftwareName(task.process)
+    def prefix   = options.suffix ? "${meta.id}${options.suffix}" : "${meta.id}"
+    def trimmed  = meta.single_end ? "-o ${prefix}.trim.fastq.gz" : "-o ${prefix}_1.trim.fastq.gz -p ${prefix}_2.trim.fastq.gz"
+    """
+    cutadapt \\
+        --cores $task.cpus \\
+        $options.args \\
+        $trimmed \\
+        $reads \\
+        > ${prefix}.cutadapt.log
+    echo \$(cutadapt --version) > ${software}.version.txt
+    """
+}

software/cutadapt/meta.yml

@@ -0,0 +1,66 @@
+name: cutadapt
+description: Perform adapter/quality trimming on sequencing reads
+keywords:
+  - trimming
+  - adapter trimming
+  - adapters
+  - quality trimming
+tools:
+  - cuatadapt:
+      description: |
+        Cutadapt finds and removes adapter sequences, primers, poly-A tails and other types of unwanted sequence from your high-throughput sequencing reads.
+      documentation: https://cutadapt.readthedocs.io/en/stable/index.html
+      doi: DOI:10.14806/ej.17.1.200
+params:
+  - outdir:
+      type: string
+      description: |
+        The pipeline's output directory. By default, the module will
+        output files into `$params.outdir/<SOFTWARE>`
+  - publish_dir_mode:
+      type: string
+      description: |
+        Value for the Nextflow `publishDir` mode parameter.
+        Available: symlink, rellink, link, copy, copyNoFollow, move.
+  - enable_conda:
+      type: boolean
+      description: |
+        Run the module with Conda using the software specified
+        via the `conda` directive
+  - singularity_pull_docker_container:
+      type: boolean
+      description: |
+        Instead of directly downloading Singularity images for use with Singularity,
+        force the workflow to pull and convert Docker containers instead.
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - reads:
+      type: file
+      description: |
+        List of input FastQ files of size 1 and 2 for single-end and paired-end data,
+        respectively.
+output:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - reads:
+      type: file
+      description: The trimmed/modified fastq reads
+      pattern: "*fastq.gz"
+  - log:
+      type: file
+      description: cuatadapt log file
+      pattern: "*cutadapt.log"
+  - version:
+      type: file
+      description: File containing software version
+      pattern: "*.{version.txt}"
+authors:
+  - "@drpatelh"
+  - "@kevinmenden"

tests/software/cutadapt/main.nf

@@ -0,0 +1,30 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { CUTADAPT } from '../../../software/cutadapt/main.nf'  addParams( options: [ args:'-q 25' ] )
+
+/*
+ * Test with single-end data
+ */
+workflow test_cutadapt_se {
+    def input = []
+    input = [ [ id:'test', single_end:true ], // meta map
+              [ file("${launchDir}/tests/data/fastq/rna/test_single_end.fastq.gz", checkIfExists: true) ] ]
+
+    CUTADAPT( input )
+}
+
+/*
+ * Test with paired-end data
+ */
+
+workflow test_cutadapt_pe {
+    def input = []
+    input = [ [ id:'test', single_end:false ], // meta map
+              [ file("${launchDir}/tests/data/fastq/rna/test_R1.fastq.gz", checkIfExists: true),
+                file("${launchDir}/tests/data/fastq/rna/test_R2.fastq.gz", checkIfExists: true) ] ]
+
+    CUTADAPT( input )
+}
+

tests/software/cutadapt/test.yml

@@ -0,0 +1,23 @@
+- name: Run cutadapt single-end test workflow
+  command: nextflow run ./tests/software/cutadapt -profile docker -entry test_cutadapt_se -c tests/config/nextflow.config
+  tags:
+    - cutadapt
+    - cutadapt_se
+  files:
+    - path: ./output/cutadapt/test.cutadapt.log
+      md5sum: 789eb0504edb85482b4ddbf5d74ea7d2
+    - path: ./output/cutadapt/test.trim.fastq.gz
+      md5sum: c972c96a5863f1dcf5d5a2ffcc1f99a5
+
+- name: Run cutadapt paired-end test workflow
+  command: nextflow run ./tests/software/cutadapt -profile docker -entry test_cutadapt_pe -c tests/config/nextflow.config
+  tags:
+    - cutadapt
+    - cutadapt_pe
+  files:
+    - path: ./output/cutadapt/test.cutadapt.log
+      md5sum: 695d9a7649bda71adb6b288a30e82143
+    - path: ./output/cutadapt/test_1.trim.fastq.gz
+      md5sum: dfb465f41075a792ae2c81c4835250a2
+    - path: ./output/cutadapt/test_2.trim.fastq.gz
+      md5sum: a3c5aa879d14ae7135807f85b957fb6c