diff.yml

name: Diff

on:
  pull_request:
    branches:
      - main
    paths:
      - 'src/**'
      - 'package.json'
      - '!package-lock.json'
      - '!yarn.lock'

jobs:
  changed-files:
    name: Changed Files
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.changed-files.outputs.all_changed_and_modified_files }}
    steps:
      - name: Checkout Default Branch
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
        with:
          fetch-depth: 0

      - name: Get Changed Files
        id: changed-files
        uses: tj-actions/changed-files@bab30c2299617f6615ec02a68b9a40d10bd21366 # v45
        with:
          files: |
            'src/**'
            package.json
          files_ignore: |
            package-lock.json
            yarn.lock
          matrix: true

      - name: List All Changed Files
        run: echo "Changed files = ${{ steps.changed-files.outputs.all_changed_and_modified_files }}"

  diff:
    name: Show Diff
    runs-on: ubuntu-latest
    needs:
      - changed-files
    strategy:
      matrix:
        paths: ${{ fromJson(needs.changed-files.outputs.matrix) }}
    steps:
      - name: Checkout Default Branch
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
        with:
          token: "${{ secrets.GITHUB_TOKEN }}"
          # ref: "${{ github.event.repository.default_branch }}"
          ref: "main"
          path: default

      - name: Checkout
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
        with:
          token: "${{ secrets.GITHUB_TOKEN }}"
          path: pull

        # The diff command will always return an exit code of 1 if differences are found.
        # the "|| :" forces it to return a 0 allowing the step to continue without failure
      - name: Generate Diff
        id: diff
        continue-on-error: true
        run: |
          diff default/${{matrix.paths}} pull/${{matrix.paths}} > diff.patch || :
          echo "diff<<EOF" >> $GITHUB_OUTPUT
          cat diff.patch >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
          echo "### Diff" >> $GITHUB_STEP_SUMMARY
          echo '```diff' >> $GITHUB_STEP_SUMMARY
          cat diff.patch >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY

      - if: ${{ steps.diff.outputs.diff != '' }}
        name: Add comment
        uses: mshick/add-pr-comment@b8f338c590a895d50bcbfa6c5859251edc8952fc # v2
        with:
          repo-token: "${{ secrets.GITHUB_TOKEN }}"
          message-id: "${{ github.event.pull_request.number }}/${{ matrix.paths }}"
          message-failure: Diff was not successful
          message: |
            ```diff
            ${{ steps.diff.outputs.diff }}
            ```

  # Summarize matrix https://gh.neting.ccmunity/t/status-check-for-a-matrix-jobs/127354/7
  diff-success:
    if: ${{ always() }}
    needs:
      - diff
    name: Diff Successful
    runs-on: ubuntu-latest
    steps:
      - if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
        name: Check matrix status
        run: exit 1