ci.yml

env:
  # We aim to always test with the latest stable Rust toolchain, however we pin to a specific
  # version like 1.70. Note that we only specify MAJOR.MINOR and not PATCH so that bugfixes still
  # come automatically. If the version specified here is no longer the latest stable version,
  # then please feel free to submit a PR that adjusts it along with the potential clippy fixes.
  RUST_STABLE_VER: "1.77" # In quotes because otherwise (e.g.) 1.70 would be interpreted as 1.7
  # The purpose of checking with the minimum supported Rust toolchain is to detect its staleness.
  # If the compilation fails, then the version specified here needs to be bumped up to reality.
  # Be sure to also update the rust-version property in the workspace Cargo.toml file,
  # plus all the README.md files of the affected packages.
  RUST_MIN_VER: "1.70"
  # List of packages that will be checked with the minimum supported Rust version.
  # This should be limited to packages that are intended for publishing.
  RUST_MIN_VER_PKGS: "-p peniko"
  # List of features that depend on the standard library and will be excluded from no_std checks.
  FEATURES_DEPENDING_ON_STD: "std,default"


# Rationale
#
# We don't run clippy with --all-targets because then even --lib and --bins are compiled with
# dev dependencies enabled, which does not match how they would be compiled by users.
# A dev dependency might enable a feature that we need for a regular dependency,
# and checking with --all-targets would not find our feature requirements lacking.
# This problem still applies to cargo resolver version 2.
# Thus we split all the targets into two steps, one with --lib --bins
# and another with --tests --benches --examples.
# Also, we can't give --lib --bins explicitly because then cargo will error on binary-only packages.
# Luckily the default behavior of cargo with no explicit targets is the same but without the error.
#
# We use cargo-hack for a similar reason. Cargo's --workspace will do feature unification across
# the whole workspace. While cargo-hack will instead check each workspace package separately.
#
# Using cargo-hack also allows us to more easily test the feature matrix of our packages.
# We use --each-feature & --optional-deps which will run a separate check for every feature.
#
# We use macos-14 explictly instead of macos-latest because:
#   * macos-latest currently points to macos-12
#   * macos-14 comes with the M1 CPU which compiles our code much faster than the older runners
# This explicit dependency can be switched back to macos-latest once it points to macos-14,
# which is expected to happen sometime in Q2 FY24 (April – June 2024).
# https://github.blog/changelog/2024-01-30-github-actions-macos-14-sonoma-is-now-available/
#
# The MSRV jobs run only cargo check because different clippy versions can disagree on goals and
# running tests introduces dev dependencies which may require a higher MSRV than the bare package.
#
# For no_std checks we target x86_64-unknown-none, because this target doesn't support std
# and as such will error out if our dependency tree accidentally tries to use std.
# https://doc.rust-lang.org/stable/rustc/platform-support/x86_64-unknown-none.html

name: CI

on:
  pull_request:
  merge_group:

jobs:
  fmt:
    name: cargo fmt
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: install stable toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_STABLE_VER }}
          components: rustfmt

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

      - name: install ripgrep
        run: |
          sudo apt update
          sudo apt install ripgrep

      - name: check copyright headers
        run: bash .github/copyright.sh

  clippy-stable:
    name: cargo clippy
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [windows-latest, macos-14, ubuntu-latest]
    steps:
      - uses: actions/checkout@v4

      - name: restore cache
        uses: Swatinem/rust-cache@v2

      - name: install stable toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_STABLE_VER }}
          targets: x86_64-unknown-none
          components: clippy

      - name: install cargo-hack
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack

      - name: cargo clippy (no_std)
        run: cargo hack clippy --workspace --locked --optional-deps --each-feature --features libm --exclude-features ${{ env.FEATURES_DEPENDING_ON_STD }} --target x86_64-unknown-none -- -D warnings

      - name: cargo clippy
        run: cargo hack clippy --workspace --locked --optional-deps --each-feature --features std -- -D warnings

      - name: cargo clippy (auxiliary)
        run: cargo hack clippy --workspace --locked --optional-deps --each-feature --features std --tests --benches --examples -- -D warnings

  clippy-stable-wasm:
    name: cargo clippy (wasm32)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: restore cache
        uses: Swatinem/rust-cache@v2

      - name: install stable toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_STABLE_VER }}
          targets: wasm32-unknown-unknown
          components: clippy

      - name: install cargo-hack
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack

      - name: cargo clippy
        run: cargo hack clippy --workspace --locked --target wasm32-unknown-unknown --optional-deps --each-feature --features std -- -D warnings

      - name: cargo clippy (auxiliary)
        run: cargo hack clippy --workspace --locked --target wasm32-unknown-unknown --optional-deps --each-feature --features std --tests --benches --examples -- -D warnings

  test-stable:
    name: cargo test
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [windows-latest, macos-14, ubuntu-latest]
    steps:
      - uses: actions/checkout@v4

      - name: restore cache
        uses: Swatinem/rust-cache@v2

      - name: install stable toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_STABLE_VER }}

      - name: cargo test
        run: cargo test --workspace --locked --all-features

  test-stable-wasm:
    name: cargo test (wasm32)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: restore cache
        uses: Swatinem/rust-cache@v2

      - name: install stable toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_STABLE_VER }}
          targets: wasm32-unknown-unknown

      # TODO: Find a way to make tests work. Until then the tests are merely compiled.
      - name: cargo test compile
        run: cargo test --workspace --locked --target wasm32-unknown-unknown --all-features --no-run

  check-msrv:
    name: cargo check (msrv)
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [windows-latest, macos-14, ubuntu-latest]
    steps:
      - uses: actions/checkout@v4

      - name: restore cache
        uses: Swatinem/rust-cache@v2

      - name: install msrv toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_MIN_VER }}
          targets: x86_64-unknown-none

      - name: install cargo-hack
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack

      - name: cargo check (no_std)
        run: cargo hack check ${{ env.RUST_MIN_VER_PKGS }} --locked --optional-deps --each-feature --features libm --exclude-features ${{ env.FEATURES_DEPENDING_ON_STD }} --target x86_64-unknown-none

      - name: cargo check
        run: cargo hack check ${{ env.RUST_MIN_VER_PKGS }} --locked --optional-deps --each-feature --features std

  check-msrv-wasm:
    name: cargo check (msrv) (wasm32)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: restore cache
        uses: Swatinem/rust-cache@v2

      - name: install msrv toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: ${{ env.RUST_MIN_VER }}
          targets: wasm32-unknown-unknown

      - name: install cargo-hack
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-hack

      - name: cargo check
        run: cargo hack check ${{ env.RUST_MIN_VER_PKGS }} --locked --target wasm32-unknown-unknown --optional-deps --each-feature --features std

  doc:
    name: cargo doc
    # NOTE: We don't have any platform specific docs in this workspace, so we only run on Ubuntu.
    #       If we get per-platform docs (win/macos/linux/wasm32/..) then doc jobs should match that.
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: restore cache
        uses: Swatinem/rust-cache@v2

      - name: install nightly toolchain
        uses: dtolnay/rust-toolchain@nightly

      # We test documentation using nightly to match docs.rs. This prevents potential breakages
      - name: cargo doc
        run: cargo doc --workspace --locked --all-features --no-deps --document-private-items -Zunstable-options -Zrustdoc-scrape-examples