benchmark.yml

# Runs the comparison benchmark (tzcraft vs chrono / time / jiff), appends
# the dependency and `unsafe` footprint, and commits the assembled report to
# `benchmark.md` in the repository root.
#
# The three comparison libraries live only in the `benchmarks/` package
# (`publish = false`); `tzcraft`'s own dependency graph is unaffected.

name: Benchmark

on:
  push:
    branches: [main]
    paths-ignore:
      - benchmark.md
      - benchmarks/Cargo.lock
  workflow_dispatch:

permissions:
  contents: write

env:
  CARGO_TERM_COLOR: always

jobs:
  benchmark:
    name: tzcraft vs chrono / time / jiff
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
        with:
          workspaces: benchmarks

      - name: Run the comparison harness
        run: cargo run --release --manifest-path benchmarks/Cargo.toml -- benchmark.md "$(date -u +%Y-%m-%dT%H:%M:%SZ)" "$(git rev-parse --short HEAD)" "$(uname -srm)"

      - name: Append dependency and unsafe footprint
        run: bash benchmarks/footprint.sh benchmark.md

      - name: Commit benchmark.md
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add benchmark.md benchmarks/Cargo.lock
          if git diff --cached --quiet; then
            echo "No benchmark changes; nothing to commit."
          else
            git commit -m "Update benchmark report"
            git push
          fi