diff-change-to-dist.yaml

name: Diff changes to GitHub release

on:
  pull_request:
    paths: ['dist/**']

permissions:
  pull-requests: write

jobs:
  generate-diff:
    name: Generate diff
    runs-on: ubuntu-latest

    # Skip workflows other than PRs such as merges to `main` but
    # also when token write permissions are unavailable on forks
    if: ${{ github.event.pull_request && !github.event.pull_request.head.repo.fork }}

    steps:
      - uses: actions/checkout@v4.1.7
        with:
          fetch-depth: 0 # Need to also checkout the base branch to compare

      - name: Install dependencies
        uses: ./.github/workflows/actions/install-node

      - name: Set up diff drivers
        run: |
          npm install -g js-beautify
          git config diff.minjs.textconv "js-beautify --editorconfig --type js"
          git config diff.mincss.textconv "js-beautify --editorconfig --type css"

      - name: Generate diff
        run: |
          # Using `origin/$GITHUB_BASE_REF` to avoid actually checking out the branch
          # as all we need is to let Git diff the two references
          bin/dist-diff.sh origin/$GITHUB_BASE_REF $GITHUB_WORKSPACE

      - name: Save GitHub release diffs
        uses: actions/upload-artifact@v4.3.4
        with:
          name: GitHub release diffs
          path: .cache/diff/dist/*.diff
          if-no-files-found: ignore

      - name: Add comment to PR
        uses: actions/github-script@v7.0.1
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const { commentDiffs } = await import('${{ github.workspace }}/.github/workflows/scripts/comments.mjs')

            // PR information
            const issueNumber = ${{ github.event.pull_request.number }}
            const commit = '${{ github.event.pull_request.head.sha }}'

            const diffs = [
              {
                path: '${{ github.workspace }}/.cache/diff/dist/js.diff',
                titleText: 'JavaScript changes to GitHub release',
                markerText: 'dist/js.diff'
              },
              {
                path: '${{ github.workspace }}/.cache/diff/dist/css.diff',
                titleText: 'Stylesheets changes to GitHub release',
                markerText: 'dist/css.diff'
              },
              {
                path: '${{ github.workspace }}/.cache/diff/dist/other.diff',
                titleText: 'Other changes to GitHub release',
                markerText: 'dist/other.diff',
                skipEmpty: true
              }
            ]

            await commentDiffs({ github, context, commit }, issueNumber, diffs)