apiVersion: tekton.dev/v1
kind: Pipeline
metadata:
  name: sum-and-multiply-pipeline
spec:
  params:
    - name: a
      type: string
      default: "1"
    - name: b
      type: string
      default: "1"
  tasks:
    - name: sum-inputs
      taskRef:
        name: sum
      params:
        - name: a
          value: "$(params.a)"
        - name: b
          value: "$(params.b)"
    - name: multiply-inputs
      taskRef:
        name: multiply
      params:
        - name: a
          value: "$(params.a)"
        - name: b
          value: "$(params.b)"
    - name: sum-and-multiply
      taskRef:
        name: sum
      params:
        - name: a
          value: "$(tasks.multiply-inputs.results.product)$(tasks.sum-inputs.results.sum)"
        - name: b
          value: "$(tasks.multiply-inputs.results.product)$(tasks.sum-inputs.results.sum)"
---
apiVersion: tekton.dev/v1
kind: Task
metadata:
  name: sum
  annotations:
    description: |
      A simple task that sums the two provided integers
spec:
  params:
    - name: a
      type: string
      default: "1"
      description: The first integer
    - name: b
      type: string
      default: "1"
      description: The second integer
  results:
    - name: sum
      description: The sum of the two provided integers
  steps:
    - name: sum
      image: mirror.gcr.io/bash
      script: |
        #!/usr/bin/env bash
        echo -n $(( "$(params.a)" + "$(params.b)" )) | tee $(results.sum.path)
---
apiVersion: tekton.dev/v1
kind: Task
metadata:
  name: multiply
  annotations:
    description: |
      A simple task that multiplies the two provided integers
spec:
  params:
    - name: a
      type: string
      default: "1"
      description: The first integer
    - name: b
      type: string
      default: "1"
      description: The second integer
  results:
    - name: product
      description: The product of the two provided integers
  steps:
    - name: product
      image: mirror.gcr.io/bash
      script: |
        #!/usr/bin/env bash
        echo -n $(( "$(params.a)" * "$(params.b)" )) | tee $(results.product.path)
---
apiVersion: tekton.dev/v1
kind: PipelineRun
metadata:
  generateName: sum-and-multiply-pipeline-run-
spec:
  pipelineRef:
    name: sum-and-multiply-pipeline
  params:
    - name: a
      value: "2"
    - name: b
      value: "10"