rust.yml

name: CI

# Runs the same checks that release.yml gates on, so a red release is caught
# on the pull request rather than at tag time.

on:
  push:
    branches: ["master"]
  pull_request:

env:
  CARGO_TERM_COLOR: always

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
      - run: rustup toolchain install stable --profile minimal --component rustfmt,clippy
      - name: Check formatting
        run: cargo fmt --all --check
      - name: Clippy
        run: cargo clippy --all-targets --locked -- -D warnings

  test:
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v7
      - run: rustup toolchain install stable --profile minimal
      # --locked so a stale Cargo.lock fails here instead of during a release.
      - run: cargo test --locked

  # Verifies the `rust-version` promised in Cargo.toml is actually buildable.
  msrv:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
      - name: Read rust-version from Cargo.toml
        id: msrv
        run: echo "version=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].rust_version')" >> "$GITHUB_OUTPUT"
      - run: rustup toolchain install ${{ steps.msrv.outputs.version }} --profile minimal
      - run: cargo +${{ steps.msrv.outputs.version }} check --locked