hyper-render 0.2.2

name: Benchmark Comparison

on:
  pull_request:
    branches: [main]

env:
  CARGO_TERM_COLOR: always

jobs:
  benchmark-compare:
    name: Compare Performance
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2

      - name: Benchmark PR branch
        run: cargo bench --all-features --bench render -- --save-baseline pr

      - name: Checkout base branch
        run: git checkout ${{ github.base_ref }}

      - name: Benchmark base branch
        run: cargo bench --all-features --bench render -- --save-baseline base

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

      - name: Compare benchmarks
        run: |
          cargo bench --all-features --bench render -- --load-baseline pr --baseline base 2>&1 | tee comparison.txt || true

      - name: Post comparison comment
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            let comparison = '';
            try {
              comparison = fs.readFileSync('comparison.txt', 'utf8');
            } catch (e) {
              comparison = 'Benchmark comparison not available';
            }

            // Truncate if too long
            if (comparison.length > 60000) {
              comparison = comparison.substring(0, 60000) + '\n... (truncated)';
            }

            const body = `## Benchmark Comparison

            <details>
            <summary>Click to expand benchmark results</summary>

            \`\`\`
            ${comparison}
            \`\`\`

            </details>

            > Benchmarks compare this PR against the base branch. Look for regressions marked with "regressed" or significant percentage changes.
            `;

            // Find existing comment
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });

            const botComment = comments.find(comment =>
              comment.user.type === 'Bot' &&
              comment.body.includes('## Benchmark Comparison')
            );

            if (botComment) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body: body
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: body
              });
            }