parameters:
- name: WithCache
  displayName: Build with Cache
  type: boolean
  default: false

- name: BuildStep
  type: stepList

- name: Today
  type: string
  default: ""

# It'd be different in different jobs in one workflow.
- name: AdditionalKey
  type: string
  default: ""

- name: ChangeEveryCommit
  type: boolean
  default: true

- name: CacheDir
  type: string
  default: ""

steps:
  - ${{if eq(parameters.WithCache, true)}}:
    - script: |
        mkdir -p ${{ parameters.CacheDir }}
      displayName: Create Cache Dir

  - ${{if eq(parameters.WithCache, true)}}:
    - task: Cache@2
      inputs:
        ${{ if eq(parameters.ChangeEveryCommit, true) }}:
          ${{if eq(variables['Build.SourceBranchName'], 'merge')}}:
            key: ' "${{parameters.Today}}" | merge | ${{parameters.AdditionalKey}} '
          ${{else}}:
            key:  ' "${{parameters.Today}}" | ${{parameters.AdditionalKey}} | "$(Build.SourceVersion)" '
          restoreKeys: |
            "${{parameters.Today}}" | ${{parameters.AdditionalKey}}
        ${{ else }}:
          key:  ' ${{parameters.AdditionalKey}} '
          restoreKeys: |
            ${{parameters.AdditionalKey}}
        path: ${{ parameters.CacheDir }}
      displayName: ccache task

  - ${{ parameters.BuildStep }}