flexi_splitter: add main.nf and yaml example

src/nf_modules/flexi_splitter/main.nf

+version = "1.0.2"
+container_url = "lbmc/flexi_splitter:${version}"
+
+params.split = ""
+params.split_out = ""
+
+process split {
+  // You can get an example of config file here:
+  // src/nf_modules/flexi_splitter/marseq_flexi_splitter.yaml
+  container = "${container_url}"
+  label "big_mem_multi_cpus"
+  tag "$file_prefix"
+  if (params.split_out != "") {
+    publishDir "results/${params.split_out}", mode: 'copy'
+  }
+
+  input:
+  tuple val(file_id), path(reads)
+  tuple val(config_id), path(config)
+
+  output:
+  tuple val(file_id), path("*.fastq*"), emit: fastq
+
+  script:
+  if (file_id instanceof List){
+    file_prefix = file_id[0]
+  } else {
+    file_prefix = file_id
+  }
+  def whitelist_param = ""
+  if (whitelist_id != "NO CONFIG"){
+    whitelist_param = "-w ${white_list}"
+  }
+
+  if (reads.size() == 2)
+  """
+  flexi_splitter ${params.split} -f ${reads[0]} ${read[1]} -c ${config} -o split
+  """
+  else
+  """
+  flexi_splitter ${params.split} -f ${reads[0]} -c ${config} -o split
+  """
+}

src/nf_modules/flexi_splitter/marseq_flexi_splitter.yaml

+PLATE:
+  coords:
+    reads: 0
+    start: 1
+    stop: 4
+    header: False
+  samples:
+    - name : Plate1
+      seq: GACT
+    - name : Plate2
+      seq: CATG
+    - name : Plate3
+      seq: CCAA
+    - name : Plate4
+      seq: CTGT
+    - name : Plate5
+      seq: GTAG
+    - name : Plate6
+      seq: TGAT
+    - name : Plate7
+      seq: ATCA
+    - name : Plate8
+      seq: TAGA
+
+conditions:
+    - Plate1 :
+      Plate1
+    - Plate2 :
+      Plate2
+    - Plate3 :
+      Plate3
+    - Plate4 :
+      Plate4
+    - Plate5 :
+      Plate5
+    - Plate6 :
+      Plate6
+    - Plate7 :
+      Plate7
+    - Plate8 :
+      Plate8