add-or-validate-labels.yaml

# Adds labels to pull requests based on the branch name. Labels are required by the "publish" workflow to determine
name: 'Validate PR labels'

on:
  workflow_dispatch: # Lets you see what labels would be added, but doesn't actually add them because no PR triggered it
  pull_request:
    types:
      - opened
      - labeled
      - unlabeled

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  validate-labels:
    name: Validate PR labels
    runs-on: ubuntu-latest
    outputs:
      VERSION_INSTRUCTION: ${{ steps.validate.outputs.VERSION_INSTRUCTION }}
    steps:
      - uses: actions/checkout@v3
      - name: Validate that version bump labels are on the PR
        id: validate
        uses: ./.github/actions/validate-version-labels
        with:
          LABELS: ${{ join(github.event.pull_request.labels.*.name, ',') }}

  upsert-pr-comment:
    name: Upsert PR labels comment
    if: always()
    needs: validate-labels
    runs-on: ubuntu-latest
    steps:
      - name: Build comment contents
        id: bc
        run: |
          VERSION_INSTRUCTION=${{ needs.validate-labels.outputs.VERSION_INSTRUCTION }}

          if [[ -z $VERSION_INSTRUCTION ]]; then 
            MESSAGE=":stop_sign: This PR needs labels to indicate how to increase the current package version in the automated workflows. Please add one of the following labels: \`none\`, \`patch\`, \`minor\`, or \`major\`."
          elif [[ $VERSION_INSTRUCTION == none ]]; then
            MESSAGE=":large_blue_circle: This PR has the \`none\` label set and it will not cause a version bump."
          else
            MESSAGE=":green_circle: This PR has valid version labels and will cause a \`$VERSION_INSTRUCTION\` bump."
          fi

          echo "MESSAGE=$MESSAGE" >> $GITHUB_OUTPUT

      - name: Find previous comment
        uses: peter-evans/find-comment@v2
        id: fc
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: 'github-actions[bot]'
          body-includes: NPM Publishing labels

      - name: Create or update comment
        uses: peter-evans/create-or-update-comment@v2
        with:
          comment-id: ${{ steps.fc.outputs.comment-id }}
          issue-number: ${{ github.event.pull_request.number }}
          body: |
            ### NPM Publishing labels :label:
            ${{ steps.bc.outputs.MESSAGE }}
          edit-mode: replace