prek/.github/workflows/performance.yml

name: Performance

on:
  workflow_call:
    inputs:
      save-rust-cache:
        required: false
        type: string
        default: "true"

permissions: {}

env:
  # Cargo env vars
  CARGO_INCREMENTAL: 0
  CARGO_NET_RETRY: 10
  CARGO_TERM_COLOR: always
  RUSTUP_MAX_RETRIES: 10

jobs:
  bloat-check:
    runs-on: ubuntu-latest
    name: "cargo | bloat check"
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false
          fetch-depth: 0
      - uses: rui314/setup-mold@725a8794d15fc7563f59595bd9556495c0564878 # v1
      - uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2.8.2
        with:
          save-if: ${{ inputs.save-rust-cache == 'true' }}
      - uses: taiki-e/install-action@542cebaaed782771e619bd5609d97659d109c492 # v2.66.7
        with:
          tool: cargo-bloat

      - name: Build head branch
        id: bloat_head
        run: |
          # Build head branch
          cargo bloat --release | tee bloat_head.txt >&1

      - name: Checkout base
        run: |
          git checkout ${{ github.event.pull_request.base.sha }}

      - name: Build base branch
        id: bloat_base
        run: |
          # Build base branch
          cargo bloat --release | tee bloat_base.txt >&1

      - name: Compare bloat results
        shell: python
        run: |
          import re
          from pathlib import Path

          def parse_size(text):
              match = re.search(r'\.text section size.*?([\d.]+)\s*([KMGT]i?B)', text)
              if not match:
                  raise ValueError("Could not find .text section size")
              value, unit = float(match.group(1)), match.group(2)
              multipliers = {'B': 1, 'KiB': 1024, 'MiB': 1024**2, 'GiB': 1024**3, 'TiB': 1024**4}
              size = value * multipliers.get(unit, 1)
              return size, f"{value} {unit}"

          head_text = Path('bloat_head.txt').read_text()
          base_text = Path('bloat_base.txt').read_text()

          head_bytes, head_size = parse_size(head_text)
          base_bytes, base_size = parse_size(base_text)

          pct_change = ((head_bytes - base_bytes) / base_bytes) * 100
          pct_display = f"{pct_change:+.2f}%"
          comparison = f"""\
          ### 📦 Cargo Bloat Comparison
          **Binary size change:** {pct_display} ({base_size} → {head_size})

          <details>
            <summary>Expand for cargo-bloat output</summary>

          #### Head Branch Results
          ```
          {head_text}
          ```

          #### Base Branch Results
          ```
          {base_text}
          ```
          </details>
          """

          Path("bloat-comparison.txt").write_text(comparison)

      - name: Upload bloat results
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
        with:
          # NOTE: prek-ci-bot uses this artifact name to post comments on PRs.
          # Make sure to update the bot if you rename the artifact.
          name: bloat-check-results
          path: bloat-comparison.txt