comment-diffs.yml

name: Comment diffs
on:
  workflow_dispatch:
  pull_request:
    branches:
      - main
    paths:
      - '.github/workflows/comment-diffs.yml'
      - 'packages/create-react-native-library/**'
      - '!**.md'

jobs:
  comment-diffs:
    runs-on: macos-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Setup
        uses: ./.github/actions/setup

      - name: Build crnl
        run: |
          yarn workspace create-react-native-library prepare

      - name: Create library
        run: |
          ./packages/create-react-native-library/bin/create-react-native-library new-version \
            --slug @bob/react-native-test \
            --description test \
            --author-name test \
            --author-email test@test \
            --author-url https://test.test \
            --repo-url https://test.test \
            --type module-mixed \
            --languages java-objc \
            --no-example \
            --no-local

      - name: Store the commit hash
        id: head_hash
        run: echo "HEAD_HASH=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT

      - name: Fetch main
        run: git fetch origin main

      - name: Checkout main
        run: git checkout origin/main

      # Removed this step for the sake of testing
      # - name: Setup again # Add a check here to setup again if deps changed
      #   uses: ./.github/actions/setup

      - name: Remove old build and build again
        run: |
          rm -rf ./packages/create-react-native-library/lib
          yarn workspace create-react-native-library prepare

      - name: Create library again
        run: |
          ./packages/create-react-native-library/bin/create-react-native-library old-version \
            --slug @bob/react-native-test \
            --description test \
            --author-name test \
            --author-email test@test \
            --author-url https://test.test \
            --repo-url https://test.test \
            --type module-mixed \
            --languages java-objc \
            --no-example \
            --no-local

      - name: Diff the libraries
        id: diff
        run: |
          echo "DIFF_RESULT<<EOF" >> $GITHUB_OUTPUT
          # Diff in recursive mod with unified format (unified format uses - and + instead of < and >)
          diff -r -u --no-ignore-file-name-case old-version new-version >> $GITHUB_OUTPUT || true 
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Comment on PR
        uses: actions/github-script@v3
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            const body = `The commit with hash: ${{ steps.head_hash.outputs.HEAD_HASH }} has changed the output of \`create-react-native-library\`. You can find the diff of the change below:

            \`\`\`diff
            ${{ steps.diff.outputs.DIFF_RESULT }}
            \`\`\`

            > This diff is between this branch and the \`main\` branch.
            `;

            const comments = await github.issues.listComments({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
            });

            if (comments.data.some(comment => comment.body === body)) {
              return;
            }

            github.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body
            })