name: CI
on:
  pull_request:
  merge_group:

env:
  MDBOOK_VERSION: 0.4.48

jobs:
  code-tests:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - name: Update rustup
      run: rustup self update
    - name: Install Rust
      run: |
        rustup set profile minimal
        rustup toolchain install nightly
        rustup default nightly
    - name: Install mdbook
      run: |
        mkdir bin
        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
        echo "$(pwd)/bin" >> $GITHUB_PATH
    - name: Report versions
      run: |
        rustup --version
        rustc -Vv
        mdbook --version
    - name: Run tests
      run: mdbook test

  style-tests:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - name: Checkout rust-lang/rust
      uses: actions/checkout@master
      with:
        repository: rust-lang/rust
        path: rust
    - name: Update rustup
      run: rustup self update
    - name: Install Rust
      run: |
        rustup set profile minimal
        rustup toolchain install nightly -c rust-docs,rustfmt
        rustup default nightly
    - name: Install mdbook
      run: |
        mkdir bin
        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
        echo "$(pwd)/bin" >> $GITHUB_PATH
    - name: Report versions
      run: |
        rustup --version
        rustc -Vv
        mdbook --version
    - name: Style checks
      working-directory: style-check
      run: cargo run --locked -- ../src
    - name: Style fmt
      working-directory: style-check
      run: cargo fmt --check
    - name: Verify the book builds
      env:
        SPEC_DENY_WARNINGS: 1
        SPEC_RUST_ROOT: ${{ github.workspace }}/rust
      run: mdbook build
    - name: Check for broken links
      run: |
        curl -sSLo linkcheck.sh \
          https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
        sh linkcheck.sh --all reference

  mdbook-spec:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - name: Update rustup
      run: rustup self update
    - name: Install Rust
      run: |
        rustup set profile minimal
        rustup toolchain install nightly -c rustfmt
        rustup default nightly
    - name: Install mdbook
      run: |
        mkdir bin
        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
        echo "$(pwd)/bin" >> $GITHUB_PATH
    - name: Report versions
      run: |
        rustup --version
        rustc -Vv
    - name: Verify mdbook-spec lockfile is current
      working-directory: ./mdbook-spec
      run: cargo update -p mdbook-spec --locked
    - name: Test mdbook-spec
      working-directory: ./mdbook-spec
      run: cargo test
    - name: Rustfmt check
      working-directory: ./mdbook-spec
      run: cargo fmt --check
    - name: Xtask rustfmt check
      working-directory: ./xtask
      run: cargo fmt --check

  preview:
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - name: Checkout rust-lang/rust
      uses: actions/checkout@master
      with:
        repository: rust-lang/rust
        path: rust
    - name: Update rustup
      run: rustup self update
    - name: Install Rust
      run: |
        rustup set profile minimal
        rustup toolchain install nightly
        rustup default nightly
    - name: Install mdbook
      run: |
        mkdir bin
        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
        echo "$(pwd)/bin" >> $GITHUB_PATH
    - name: Build the book
      env:
        SPEC_RELATIVE: 0
        SPEC_RUST_ROOT: ${{ github.workspace }}/rust
      run: mdbook build --dest-dir dist/preview-${{ github.event.pull_request.number }}
    - name: Upload artifact
      uses: actions/upload-artifact@v4
      with:
        name: preview-${{ github.event.pull_request.number }}
        overwrite: true
        path: dist

  # The success job is here to consolidate the total success/failure state of
  # all other jobs. This job is then included in the GitHub branch protection
  # rule which prevents merges unless all other jobs are passing. This makes
  # it easier to manage the list of jobs via this yml file and to prevent
  # accidentally adding new jobs without also updating the branch protections.
  success:
    name: Success gate
    if: always()
    needs:
      - code-tests
      - style-tests
      - mdbook-spec
      # preview is explicitly excluded here since it doesn't run on merge
    runs-on: ubuntu-latest
    steps:
      - run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'
      - name: Done
        run: exit 0
