run-build.yml

name: Compare Build Logs

on:
  pull_request:
    types: [opened, synchronize, reopened, edited]

jobs:
  compare-build-logs:
    runs-on: ubuntu-latest
    permissions:
      checks: write
      pull-requests: write
      contents: write
      issues: read
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4.2.2
        with:
          fetch-depth: 0  # Fetch all history for accurate comparisons

      - name: Checkout dev branch
        run: git checkout dev

      - name: Install dependencies (dev branch)
        run: npm install

      - name: Build project (dev branch) and save log
        run: npm run build > dev-build-log.txt 2>&1

      - name: Extract relevant section from dev log
        run: |
          sed -n '/building for production.../,/modules transformed./p' dev-build-log.txt > relevant-dev-log.txt

      - name: Clean up ANSI color codes from dev log
        run: |
          sed -r 's/\x1B\[[0-9;]*[mGKH]//g' relevant-dev-log.txt > cleaned-dev-log.txt

      - name: Save extracted and cleaned dev log as artifact
        uses: actions/upload-artifact@v4.4.0
        with:
          name: relevant-cleaned-dev-log
          path: cleaned-dev-log.txt

      - name: Checkout PR branch
        run: git checkout ${{ github.head_ref }}

      - name: Install dependencies (PR branch)
        run: npm install

      - name: Build project (PR branch) and save log
        run: npm run build > pr-build-log.txt 2>&1

      - name: Extract relevant section from PR log
        run: |
          sed -n '/building for production.../,/modules transformed./p' pr-build-log.txt > relevant-pr-log.txt

      - name: Clean up ANSI color codes from PR log
        run: |
          sed -r 's/\x1B\[[0-9;]*[mGKH]//g' relevant-pr-log.txt > cleaned-pr-log.txt

      - name: Save extracted and cleaned PR log as artifact
        uses: actions/upload-artifact@v4.4.0
        with:
          name: relevant-cleaned-pr-log
          path: cleaned-pr-log.txt

      - name: Compare cleaned logs for differences
        id: diff_check
        run: |
          echo "Comparing cleaned logs for differences..."

          # Use diff and ignore lines containing "modules transformed"
          diff -I "modules transformed" cleaned-dev-log.txt cleaned-pr-log.txt > log-diff.txt || true

          # Check if diff output is non-empty
          if [ -s log-diff.txt ]; then
            echo "Differences detected."
            echo "diff_found=true" >> $GITHUB_ENV
          else
            echo "No differences found." > log-diff.txt
            echo "diff_found=false" >> $GITHUB_ENV
          fi

      - name: Upload diff as artifact for review
        uses: actions/upload-artifact@v4.4.0
        with:
          name: build-log-diff
          path: log-diff.txt

      - name: Read log-diff.txt content
        id: read_diff
        run: |
          if [ -f log-diff.txt ]; then
            echo "DIFF_CONTENT<<EOF" >> $GITHUB_ENV
            cat log-diff.txt >> $GITHUB_ENV
            echo "EOF" >> $GITHUB_ENV
          else
            echo "No diff file found." >> $GITHUB_ENV
          fi

      - name: Comment PR with build log differences
        if: env.diff_found == 'true'
        uses: mshick/add-pr-comment@v2.8.2
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          message: |
            **Build Log Differences Found**:

            ```diff
            ${{ env.DIFF_CONTENT }}
            ```