action.yml

name: 'Nx set SHAs'
description: 'Derives SHAs for base and head for use in nx affected commands, optionally setting them as env variables for the current job'

inputs:
  main-branch-name:
    description: 'The name of the main branch in your repo, used as the target of PRs. E.g. main, master etc'
    default: 'main'
  set-environment-variables-for-job:
    description: 'Applies the derived SHAs for base and head as NX_BASE and NX_HEAD environment variables within the current Job'
    default: 'true'
  error-on-no-successful-workflow:
    description: 'By default, if no successful workflow is found on the main branch to determine the SHA, we will log a warning and use HEAD~1. Enable this option to error and exit instead.'
    default: 'false'
  fallback-sha:
    description: 'Fallback SHA to use if no successful workflow run is found.'
    required: false
    default: ''
  last-successful-event:
    description: 'The type of event to check for the last successful commit corresponding to that workflow-id, e.g. push, pull_request, release etc'
    default: 'push'
  working-directory:
    description: 'The directory where your repository is located'
    default: '.'
  workflow-id:
    description: 'The ID of the workflow to track or name of the file name. E.g. ci.yml. Defaults to current workflow'

outputs:
  base:
    description: The value intended for use with --base or NX_BASE in all subsequent `nx affected` commands within the current workflow
    value: ${{ steps.setSHAs.outputs.base }}
  head:
    description: The value intended for use with --head or NX_HEAD in all subsequent `nx affected` commands within the current workflow
    value: ${{ steps.setSHAs.outputs.head }}
  noPreviousBuild:
    description: "Used to check if a previous run was found in order to perform additional logic later on in your workflow, the only possible values is the string 'true', otherwise it won't be set"
    value: ${{ steps.setSHAs.outputs.noPreviousBuild }}

runs:
  using: 'composite'
  steps:
    - name: Set base and head SHAs used for nx affected
      id: setSHAs
      shell: bash
      env:
        gh_token: ${{ github.token }}
        main_branch_name: ${{ inputs.main-branch-name }}
        error_on_no_successful_workflow: ${{ inputs.error-on-no-successful-workflow }}
        last_successful_event: ${{ inputs.last-successful-event }}
        working_directory: ${{ inputs.working-directory }}
        working_id: ${{ inputs.workflow-id }}
        fallback_sha: ${{ inputs.fallback-sha }}
      run: node "$GITHUB_ACTION_PATH/dist/index.js" "$gh_token" "$main_branch_name" "$error_on_no_successful_workflow" "$last_successful_event" "$working_directory" "$working_id" "$fallback_sha"

    - name: Log base and head SHAs used for nx affected
      shell: bash
      run: |
        echo "Base SHA"
        echo ${{ steps.setSHAs.outputs.base }}
        echo ""
        echo "Head SHA"
        echo ${{ steps.setSHAs.outputs.head }}
        echo ""

    - name: Optionally set the derived SHAs as NX_BASE and NX_HEAD environment variables for the current job
      shell: bash
      if: ${{ inputs.set-environment-variables-for-job == 'true' }}
      run: |
        echo "NX_BASE=${{ steps.setSHAs.outputs.base }}" >> $GITHUB_ENV
        echo "NX_HEAD=${{ steps.setSHAs.outputs.head }}" >> $GITHUB_ENV
        echo "NX_BASE and NX_HEAD environment variables have been set for the current Job"
branding:
  icon: 'terminal'
  color: 'blue'