feedback.nf

#!/usr/bin/env nextflow
/*
 * Copyright 2020-2022, Seqera Labs
 * Copyright 2013-2019, Centre for Genomic Regulation (CRG)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
nextflow.enable.dsl=1

foo = Channel.from('abc')
loop = Channel.create()

process bar {
  input:
  file x from foo .mix(loop.take(2))
  output:
  file q

  """
  rev $x > q
  """
}

process baz {
  input:
  file q from q
  output:
  file z into loop
  file z into result

  """
  cat $q > z
  echo 'hello' >> z
  """
}

result.last().view { it.text }