bar

#!/usr/bin/env ruby

require 'json'
require 'optparse'

options = {}
OptionParser.new do |opt|
  opt.on('--report FILENAME') { |report| options[:report] = report } 
end.parse!

inputs = JSON.parse(ARGF.read)

File.open(options[:report], 'w') do |report|
    if inputs["fav_colour"] != "maroon"
        report.puts "Reports do not pass"
        exit 100
    else
        report.puts "Everything looks good"
    end
end

generate_params

#!/usr/bin/env ruby

require 'optparse'
require 'json'

options = {}
OptionParser.new do |opt|
  opt.on('--iteration INT') { |it| 
    iteration = it.to_i
    case iteration
    when 0..2
      options["effort"] = "light"
    when 3..5
      options["effort"] = "moderate"
    else
      options["effort"] = "extreme"
    end
    case iteration
    when 0..1
      options["fav_colour"] = "green"
    when 2..6
      options["fav_colour"] = "purple"
    else
      options["fav_colour"] = "maroon"
    end
  }
end.parse!

puts JSON.pretty_generate(options)

main.nf

process Foo {
    output:
    path("*")

    "touch out.{1,2,3,4,5,6,7,8}.txt"
}

process Bar {
    errorStrategy { task.exitStatus == 100 ? 'retry' : 'terminate' }
    maxRetries 20

    input:
    path(infiles)

    output:
    path("report.html")

    """
    generate_params --iteration ${task.attempt} > params.txt
    bar params.txt --report report.html
    """
}

workflow {
    Foo() | Bar
}