name: Lint

on:
  pull_request: {}
  merge_group: { types: [checks_requested] }

permissions:
  contents: read

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  fmt:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - uses: actions-rust-lang/setup-rust-toolchain@v1.10.1
        with:
          toolchain: nightly
          components: rustfmt

      - name: Rustfmt Check
        run: cargo fmt --all -- --check

  clippy:
    permissions:
      contents: write

    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - uses: actions-rust-lang/setup-rust-toolchain@v1.10.1
        with: { components: clippy }

      - uses: giraffate/clippy-action@v1.0.1
        with:
          reporter: "github-pr-check"
          github_token: ${{ secrets.GITHUB_TOKEN }}
          clippy_flags: --workspace --all-features --tests --examples --bins -- -Dclippy::todo -Aunknown_lints

  check-external-types:
    if: false # rustdoc mismatch currently
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Rust (${{ vars.RUST_VERSION_EXTERNAL_TYPES }})
        uses: actions-rust-lang/setup-rust-toolchain@v1.10.1
        with:
          toolchain: ${{ vars.RUST_VERSION_EXTERNAL_TYPES }}

      - name: Install just
        uses: taiki-e/install-action@v2.45.6
        with:
          tool: just

      - name: Install cargo-check-external-types
        uses: taiki-e/cache-cargo-install-action@v2.0.1
        with:
          tool: cargo-check-external-types

      - name: check external types
        run: just check-external-types-all +${{ vars.RUST_VERSION_EXTERNAL_TYPES }}

  public-api-diff:
    name: Public API Diff
    runs-on: ubuntu-latest
    steps:
      - name: Checkout main branch
        uses: actions/checkout@v4
        with:
          ref: ${{ github.base_ref }}

      - name: Checkout PR branch
        uses: actions/checkout@v4

      - name: Install Rust (${{ vars.RUST_VERSION_API_DIFF }})
        uses: actions-rust-lang/setup-rust-toolchain@v1.8.0
        with:
          toolchain: ${{ vars.RUST_VERSION_API_DIFF }}

      - name: Install cargo-public-api
        uses: taiki-e/install-action@v2.45.6
        with:
          tool: cargo-public-api

      - name: Generate API diff
        run: |
          for f in $(find -mindepth 2 -maxdepth 2 -name Cargo.toml); do
            cargo public-api --manifest-path "$f" --simplified diff ${{ github.event.pull_request.base.sha }}..${{ github.sha }}
          done