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 }}
                      ```