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"
  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: ${{ inputs.workflow-id }}
      run: node "$GITHUB_ACTION_PATH/dist/index.js" "$gh_token" "$main_branch_name" "$error_on_no_successful_workflow" "$last_successful_event" "$working_directory" "$working_id"

    - 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"