ci.yml

name: CI

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

env:
  CARGO_TERM_COLOR: always

jobs:
  build:
    name: Build, Clippy, and Test
    runs-on: macos-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      # The channel is read from rust-toolchain.toml so the pinned version lives
      # in exactly one place. Floating `stable` here is what let a clippy
      # release break unrelated PRs.
      - name: Read pinned Rust toolchain
        id: rust
        run: |
          set -euo pipefail
          channel=$(sed -n 's/^[[:space:]]*channel[[:space:]]*=[[:space:]]*"\(.*\)"/\1/p' rust-toolchain.toml)
          if [ -z "$channel" ]; then
            echo "::error::rust-toolchain.toml does not declare a toolchain channel"
            exit 1
          fi
          echo "Pinned Rust channel: ${channel}"
          echo "channel=${channel}" >> "$GITHUB_OUTPUT"

      - name: Install Rust (pinned)
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ steps.rust.outputs.channel }}
          components: clippy

      - name: Cache cargo registry
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            ${{ runner.os }}-cargo-registry-

      - name: Cache build target
        uses: actions/cache@v4
        with:
          # Keyed on the pinned toolchain as well as the lockfile: artifacts built
          # by a different rustc must not be reused.
          path: target
          key: ${{ runner.os }}-cargo-target-${{ hashFiles('**/Cargo.lock', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-target-

      - name: Build
        run: cargo build --verbose

      - name: Clippy
        run: cargo clippy -- -D warnings

      - name: Test
        run: cargo test --verbose